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First Amended and Restated Agreement of Limited Partnership EV Energy Partners, L.P. September 29, 2006

Limited Partnership Agreement

First Amended and Restated Agreement of Limited Partnership EV Energy Partners, L.P. September 29, 2006 | Document Parties: EV ENERGY PARTNERS, LP You are currently viewing:
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EV ENERGY PARTNERS, LP

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Title: First Amended and Restated Agreement of Limited Partnership EV Energy Partners, L.P. September 29, 2006
Governing Law: Delaware     Date: 10/5/2006
Industry: Oil and Gas Operations     Sector: Energy

First Amended and Restated Agreement of Limited Partnership EV Energy Partners, L.P. September 29, 2006, Parties: ev energy partners  lp
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                                                                     EXHIBIT 3.1

                                                                      APPENDIX A

                           First Amended and Restated
                        Agreement of Limited Partnership
                            EV Energy Partners, L.P.
                                September 29, 2006

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                                TABLE OF CONTENTS

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ARTICLE I. Definitions............................................................................     A-1
   SECTION 1.1      Definitions....................................................................     A-1
   SECTION 1.2      Construction...................................................................    A-16

ARTICLE II. Organization..........................................................................    A-17
   SECTION 2.1      Formation......................................................................    A-17
   SECTION 2.2      Name...........................................................................    A-17
   SECTION 2.3      Registered Office; Registered Agent; Principal Office; Other Offices...........    A-17
   SECTION 2.4      Purpose and Business...........................................................    A-17
   SECTION 2.5      Powers.........................................................................    A-17
   SECTION 2.6      Power of Attorney..............................................................    A-18
   SECTION 2.7      Term...........................................................................    A-19
   SECTION 2.8      Title to Partnership Assets....................................................    A-19

ARTICLE III. Rights of Limited Partners...........................................................    A-19
   SECTION 3.1      Limitation of Liability........................................................    A-19
   SECTION 3.2      Management of Business.........................................................    A-19
   SECTION 3.3      Outside Activities of the Limited Partners.....................................    A-19
   SECTION 3.4      Rights of Limited Partners.....................................................    A-19

ARTICLE IV. Certificates; Record Holders; Transfer of Partnership Interests; Redemption of
   Partnership Interests..........................................................................    A-20
   SECTION 4.1      Certificates...................................................................    A-20
   SECTION 4.2      Mutilated, Destroyed, Lost or Stolen Certificates..............................    A-21
   SECTION 4.3      Record Holders.................................................................    A-21
   SECTION 4.4      Transfer Generally.............................................................    A-21
   SECTION 4.5      Registration and Transfer of Limited Partner Interests.........................    A-22
   SECTION 4.6      Transfer of the General Partner's General Partner Interest.....................    A-22
   SECTION 4.7      Transfer of Incentive Distribution Rights......................................    A-23
   SECTION 4.8      Restrictions on Transfers......................................................    A-23
   SECTION 4.9      Citizenship Certificates; Non-citizen Assignees................................    A-24
   SECTION 4.10     Redemption of Partnership Interests of Non-citizen Assignees...................    A-25

ARTICLE V. Capital Contributions and Issuance of Partnership Interests............................    A-26
   SECTION 5.1      Organizational Contributions...................................................    A-26
   SECTION 5.2      Contributions by the General Partner and its Affiliates and [EnCap]............    A-26
   SECTION 5.3      Contributions by Initial Limited Partners......................................    A-26
   SECTION 5.4      Interest and Withdrawal........................................................    A-27
   SECTION 5.5      Capital Accounts...............................................................    A-27
   SECTION 5.6      Issuances of Additional Partnership Securities.................................    A-29
   SECTION 5.7      Conversion of Subordinated Units...............................................    A-30
   SECTION 5.8      Limited Preemptive Right.......................................................    A-31
</TABLE>

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   SECTION 5.9      Splits and Combinations..........................................................    A-32
   SECTION 5.10     Fully Paid and Non-Assessable Nature of Limited Partner Interests................    A-32

   SECTION 5.11     Issuance of Class B Units in Connection with Reset of Incentive Distribution
                   Rights...........................................................................    A-32

ARTICLE VI. Allocations and Distributions...........................................................    A-34
   SECTION 6.1      Allocations for Capital Account Purposes.........................................    A-34
   SECTION 6.2      Allocations for Tax Purposes.....................................................    A-40

   SECTION 6.3      Requirement and Characterization of Distributions; Distributions to Record
                   Holders..........................................................................     A-42
   SECTION 6.4      Distributions of Available Cash from Operating Surplus...........................    A-42
   SECTION 6.5      Distributions of Available Cash from Capital Surplus.............................    A-44
   SECTION 6.6      Adjustment of Minimum Quarterly Distribution and Target Distribution Levels......    A-44

   SECTION 6.7      Special Provisions Relating to the Holders of Subordinated Units and Class B
                   Units............................................................................    A-44

   SECTION 6.8      Special Provisions Relating to the Holders of Incentive Distribution Rights......    A-45
   SECTION 6.9      Entity-Level Taxation............................................................    A-45

ARTICLE VII. Management and Operation of Business...................................................    A-46
   SECTION 7.1      Management.......................................................................    A-46
   SECTION 7.2      Certificate of Limited Partnership...............................................    A-47
   SECTION 7.3      Restrictions on the General Partner's Authority..................................    A-48
   SECTION 7.4      Reimbursement of the General Partner.............................................    A-48
   SECTION 7.5      Outside Activities...............................................................    A-49

   SECTION 7.6      Loans from the General Partner; Loans or Contributions from the Partnership or
                   Group Members....................................................................    A-50

   SECTION 7.7      Indemnification..................................................................    A-50
   SECTION 7.8      Liability of Indemnitees.........................................................    A-51
   SECTION 7.9      Resolution of Conflicts of Interest; Standards of Conduct and Modification of
                   Duties...........................................................................    A-52

   SECTION 7.10      Other Matters Concerning the General Partner.....................................    A-53
   SECTION 7.11     Purchase or Sale of Partnership Securities.......................................    A-53
   SECTION 7.12     Registration Rights of the General Partner and its Affiliates....................    A-54
   SECTION 7.13     Reliance by Third Parties........................................................    A-56

ARTICLE VIII. Books, Records, Accounting and Reports................................................    A-57
   SECTION 8.1      Records and Accounting...........................................................    A-57
   SECTION 8.2      Fiscal Year......................................................................    A-57
   SECTION 8.3      Reports..........................................................................    A-57

ARTICLE IX. Tax Matters.............................................................................    A-57
   SECTION 9.1      Tax Returns and Information......................................................    A-57
   SECTION 9.2      Tax Elections....................................................................    A-57
   SECTION 9.3      Tax Controversies................................................................    A-58
   SECTION 9.4      Withholding......................................................................    A-58
</TABLE>

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ARTICLE X. Admission of Partners.................................................................     A-58
   SECTION 10.1     Admission of Limited Partners.................................................     A-58
   SECTION 10.2     Admission of Successor General Partner........................................     A-59
   SECTION 10.3     Amendment of Agreement and Certificate of Limited Partnership.................     A-59

ARTICLE XI. Withdrawal or Removal of Partners....................................................     A-59
   SECTION 11.1     Withdrawal of the General Partner.............................................     A-59
   SECTION 11.2     Removal of the General Partner................................................     A-60
   SECTION 11.3     Interest of Departing General Partner and Successor General Partner...........     A-61
   SECTION 11.4     Termination of Subordination Period, Conversion of Subordinated Units and
                   Extinguishment of Cumulative Common Unit Arrearages...........................     A-62

   SECTION 11.5     Withdrawal of Limited Partners................................................     A-62

ARTICLE XII. Dissolution and Liquidation.........................................................     A-62
   SECTION 12.1     Dissolution...................................................................     A-62
   SECTION 12.2     Continuation of the Business of the Partnership After Dissolution.............     A-62
   SECTION 12.3     Liquidator....................................................................     A-63
   SECTION 12.4     Liquidation...................................................................     A-63
   SECTION 12.5     Cancellation of Certificate of Limited Partnership............................     A-64
   SECTION 12.6     Return of Contributions.......................................................     A-64
   SECTION 12.7     Waiver of Partition...........................................................     A-64
   SECTION 12.8     Capital Account Restoration...................................................     A-64

ARTICLE XIII. Amendment of Partnership Agreement; Meetings; Record Date..........................     A-64
   SECTION 13.1     Amendments to be Adopted Solely by the General Partner........................     A-64
   SECTION 13.2     Amendment Procedures..........................................................     A-65
   SECTION 13.3     Amendment Requirements........................................................     A-66
   SECTION 13.4     Special Meetings..............................................................     A-66
   SECTION 13.5     Notice of a Meeting...........................................................     A-67
   SECTION 13.6     Record Date...................................................................     A-67
   SECTION 13.7     Adjournment...................................................................     A-67
   SECTION 13.8     Waiver of Notice; Approval of Meeting; Approval of Minutes....................     A-67
   SECTION 13.9     Quorum and Voting.............................................................     A-67
   SECTION 13.10    Conduct of a Meeting..........................................................     A-68
   SECTION 13.11    Action Without a Meeting......................................................     A-68
   SECTION 13.12    Right to Vote and Related Matters.............................................     A-68

ARTICLE XIV. Merger, Consolidation or Conversion.................................................     A-69
   SECTION 14.1     Authority.....................................................................     A-69
   SECTION 14.2     Procedure for Merger, Consolidation or Conversion.............................     A-69
   SECTION 14.3     Approval by Limited Partners..................................................     A-70
   SECTION 14.4     Certificate of Merger.........................................................     A-71
   SECTION 14.5     Effect of Merger, Consolidation or Conversion.................................     A-71
</TABLE>

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ARTICLE XV. Right to Acquire Limited Partner Interests..........................................      A-72
   SECTION 15.1     Right to Acquire Limited Partner Interests...................................      A-72

ARTICLE XVI. General Provisions.................................................................      A-73
   SECTION 16.1     Addresses and Notices........................................................      A-73
   SECTION 16.2     Further Action...............................................................      A-74
   SECTION 16.3     Binding Effect...............................................................      A-74
   SECTION 16.4     Integration..................................................................      A-74
   SECTION 16.5     Creditors....................................................................      A-74
   SECTION 16.6     Waiver.......................................................................      A-74
   SECTION 16.7     Third-Party Beneficiaries....................................................      A-74
   SECTION 16.8     Counterparts.................................................................      A-74
   SECTION 16.9     Applicable Law...............................................................      A-74
   SECTION 16.10    Invalidity of Provisions.....................................................       A-74
   SECTION 16.11    Consent of Partners..........................................................      A-74
   SECTION 16.12    Facsimile Signatures.........................................................      A-74
</TABLE>

                                       A-iv
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                           First Amended and Restated
                        Agreement of Limited Partnership
                                       of
                            EV Energy Partners, L.P.

      This First Amended and Restated Agreement of Limited Partnership of EV
Energy Partners, L.P., dated as of , 2006, is entered into by and between EV
Energy GP, L.P., a Delaware limited partnership, as the General Partner, and
EnerVest Management Partners, Ltd., a Texas limited partnership, as the
Organizational Limited Partner, together with any other Persons who become
Partners in the Partnership or parties hereto as provided herein. In
consideration of the covenants, conditions and agreements contained herein, the
parties hereto hereby agree as follows:

                                   ARTICLE I.

                                   Definitions

      SECTION 1.1 Definitions.

      The following definitions shall be for all purposes, unless otherwise
clearly indicated to the contrary, applied to the terms used in this Agreement.

      "Acquisition" means any transaction in which any Group Member acquires
(through an asset acquisition, merger, stock acquisition or other form of
investment) control over all or a portion of the assets, properties or business
of another Person for the purpose of increasing the production, over the long
term, of the oil and gas properties owned by of the Partnership Group or the
operating capacity of the other assets owned by the Partnership Group from the
production, over the long term, or operating capacity of the Partnership Group
existing immediately prior to such transaction.

      "Additional Book Basis" means the portion of any remaining Carrying Value
of an Adjusted Property that is attributable to positive adjustments made to
such Carrying Value as a result of Book-Up Events. For purposes of determining
the extent that Carrying Value constitutes Additional Book Basis:

            Any negative adjustment made to the Carrying Value of an Adjusted
      Property as a result of either a Book-Down Event or a Book-Up Event shall
      first be deemed to offset or decrease that portion of the Carrying Value
      of such Adjusted Property that is attributable to any prior positive
      adjustments made thereto pursuant to a Book-Up Event or Book-Down Event.

            If Carrying Value that constitutes Additional Book Basis is reduced
      as a result of a Book-Down Event and the Carrying Value of other property
      is increased as a result of such Book-Down Event, an allocable portion of
      any such increase in Carrying Value shall be treated as Additional Book
      Basis; provided, that the amount treated as Additional Book Basis pursuant
      hereto as a result of such Book-Down Event shall not exceed the amount by
      which the Aggregate Remaining Net Positive Adjustments after such
      Book-Down Event exceeds the remaining Additional Book Basis attributable
      to all of the Partnership's Adjusted Property after such Book-Down Event
      (determined without regard to the application of this clause (b) to such
      Book-Down Event).

      "Additional Book Basis Derivative Items" means any Book Basis Derivative
Items that are computed with reference to Additional Book Basis. To the extent
that the Additional Book Basis attributable to all of the Partnership's Adjusted
Property as of the beginning of any taxable period exceeds the Aggregate
Remaining Net Positive Adjustments as of the beginning of such period (the
"EXCESS ADDITIONAL BOOK BASIS"), the Additional Book Basis Derivative Items for
such period shall be reduced by the amount that bears the same ratio to the
amount of Additional Book Basis Derivative Items determined without regard to
this sentence as the Excess Additional Book Basis bears to the Additional Book
Basis as of the beginning of such period.

      "Adjusted Capital Account" means the Capital Account maintained for each
Partner as of the end of each fiscal year of the Partnership, (a) increased by
any amounts that such Partner is obligated to restore under the standards set by
Treasury Regulation Section 1.704-1(b)(2)(ii)(c) (or is deemed obligated to
restore under

                                       A-1
<PAGE>

Treasury Regulation Sections 1.704-2(g) and 1.704-2(i)(5)) and (b) decreased by
(i) the amount of all deductions in respect of depletion that, as of the end of
such fiscal year, are reasonably expected to be made to such Partner's Capital
Account in respect of the oil and gas properties of the partnership, (ii) the
amount of all losses and deductions that, as of the end of such fiscal year, are
reasonably expected to be allocated to such Partner in subsequent years under
Sections 704(e)(2) and 706(d) of the Code and Treasury Regulation Section
1.751-1(b)(2)(ii), and (ii) the amount of all distributions that, as of the end
of such fiscal year, are reasonably expected to be made to such Partner in
subsequent years in accordance with the terms of this Agreement or otherwise to
the extent they exceed offsetting increases to such Partner's Capital Account
that are reasonably expected to occur during (or prior to) the year in which
such distributions are reasonably expected to be made (other than increases as a
result of a minimum gain chargeback pursuant to Section 6.1(d)(i) or Section
6.1(d)(ii)). The foregoing definition of Adjusted Capital Account is intended to
comply with the provisions of Treasury Regulation Section 1.704-1(b)(2)(ii)(d)
and shall be interpreted consistently therewith. The "Adjusted Capital Account"
of a Partner in respect of a General Partner Interest, a Common Unit, a
Subordinated Unit, a Class B Unit or an Incentive Distribution Right or any
other Partnership Interest shall be the amount that such Adjusted Capital
Account would be if such General Partner Interest, Common Unit, Subordinated
Unit, Class B Unit, Incentive Distribution Right or other Partnership Interest
were the only interest in the Partnership held by such Partner from and after
the date on which such General Partner Interest, Common Unit, Subordinated Unit,
Incentive Distribution Right or other Partnership Interest was first issued.

      "Adjusted Operating Surplus" means, with respect to any period, Operating
Surplus generated with respect to such period (a) less (i) any net increase in
Working Capital Borrowings with respect to such period and (ii) any net decrease
in cash reserves for Operating Expenditures with respect to such period not
relating to an Operating Expenditure made with respect to such period, and (b)
plus (i) any net decrease in Working Capital Borrowings with respect to such
period, (ii) any net increase made in subsequent periods in cash reserves for
Operating Expenditures initially established with respect to such period and
(iii) any net increase in cash reserves for Operating Expenditures with respect
to such period required by any debt instrument for the repayment of principal,
interest or premium. Adjusted Operating Surplus does not include that portion of
Operating Surplus included in clause (a)(i) of the definition of Operating
Surplus.

      "Adjusted Property" means any property the Carrying Value of which has
been adjusted pursuant to Section 5.5(d)(i) or Section 5.5(d)(ii).

      "Affiliate" means, with respect to any Person, any other Person that
directly or indirectly through one or more intermediaries controls, is
controlled by or is under common control with, the Person in question. As used
herein, the term "control" means the possession, direct or indirect, of the
power to direct or cause the direction of the management and policies of a
Person, whether through ownership of voting securities, by contract or
otherwise.

      "Aggregate Remaining Net Positive Adjustments" means, as of the end of any
taxable period, the sum of the Remaining Net Positive Adjustments of all the
Partners.

      "Agreed Allocation" means any allocation, other than a Required
Allocation, of an item of income, gain, loss or deduction pursuant to the
provisions of Section 6.1, including a Curative Allocation (if appropriate to
the context in which the term "Agreed Allocation" is used).

      "Agreed Value" of any Contributed Property means the fair market value of
such property or other consideration at the time of contribution as determined
by the General Partner. The General Partner shall use such method as it
determines to be appropriate to allocate the aggregate Agreed Value of
Contributed Properties contributed to the Partnership in a single or integrated
transaction among each separate property on a basis proportional to the fair
market value of each Contributed Property.

      "Agreement" means this First Amended and Restated Agreement of Limited
Partnership of EV Energy Partners, L.P., as it may be amended, supplemented or
restated from time to time.

       "Associate" means, when used to indicate a relationship with any Person,
(a) any corporation or organization of which such Person is a director, officer
or partner or is, directly or indirectly, the owner of

                                       A-2
<PAGE>

20% or more of any class of voting stock or other voting interest; (b) any trust
or other estate in which such Person has at least a 20% beneficial interest or
as to which such Person serves as trustee or in a similar fiduciary capacity;
and (c) any relative or spouse of such Person, or any relative of such spouse,
who has the same principal residence as such Person.

      "Available Cash" means, with respect to any Quarter ending prior to the
Liquidation Date:

            (a) the sum of (i) all cash and cash equivalents of the Partnership
      Group on hand at the end of such Quarter, and (ii) if the General Partner
      so determines, all or any portion of any additional cash and cash
      equivalents of the Partnership Group on hand on the date of determination
      of Available Cash with respect to such Quarter, including cash from
      Working Capital Borrowings, less

            (b) the amount of any cash reserves established by the General
      Partner to (i) provide for the proper conduct of the business of the
      Partnership Group (including reserves for future capital expenditures and
      for anticipated future credit needs of the Partnership Group) subsequent
      to such Quarter, (ii) comply with applicable law or any loan agreement,
      security agreement, mortgage, debt instrument or other agreement or
      obligation to which any Group Member is a party or by which it is bound or
      its assets are subject or (iii) provide funds for distributions under
      Section 6.4 or Section 6.5 in respect of any one or more of the next four
      Quarters; provided, however, that the General Partner may not establish
      cash reserves pursuant to (iii) above if the effect of such reserves would
      be that the Partnership is unable to distribute the Minimum Quarterly
      Distribution on all Common Units, plus any Cumulative Common Unit
      Arrearage on all Common Units, with respect to such Quarter; and, provided
      further, that disbursements made by a Group Member or cash reserves
      established, increased or reduced after the end of such Quarter but on or
      before the date of determination of Available Cash with respect to such
      Quarter shall be deemed to have been made, established, increased or
      reduced, for purposes of determining Available Cash, within such Quarter
      if the General Partner so determines.

      Notwithstanding the foregoing, "Available Cash" with respect to the
Quarter in which the Liquidation Date occurs and any subsequent Quarter shall
equal zero.

      "Board of Directors" means, with respect to the Board of Directors of the
General Partner, its board of directors or managers, as applicable, if a
corporation or limited liability company, or if a limited partnership, the board
of directors or board of managers of the general partner of the General Partner.

      "Book Basis Derivative Items" means any item of income, deduction, gain,
loss, Simulated Depletion, Simulated Gain or Simulated Loss included in the
determination of Net Income or Net Loss that is computed with reference to the
Carrying Value of an Adjusted Property (e.g., depreciation, Simulated Depletion,
gain, loss, Simulated Gain or Simulated Loss with respect to an Adjusted
Property).

      "Book-Down Event" means an event that triggers a negative adjustment to
the Capital Accounts of the Partners pursuant to Section 5.5(d).

      "Book-Tax Disparity" means with respect to any item of Contributed
Property or Adjusted Property, as of the date of any determination, the
difference between the Carrying Value of such Contributed Property or Adjusted
Property and the adjusted basis thereof for federal income tax purposes as of
such date. A Partner's share of the Partnership's Book-Tax Disparities in all of
its Contributed Property and Adjusted Property will be reflected by the
difference between such Partner's Capital Account balance as maintained pursuant
to Section 5.5 and the hypothetical balance of such Partner's Capital Account
computed as if it had been maintained strictly in accordance with federal income
tax accounting principles.

      "Book-Up Event" means an event that triggers a positive adjustment to the
Capital Accounts of the Partners pursuant to Section 5.5(d).

      "Business Day" means Monday through Friday of each week, except that a
legal holiday recognized as such by the government of the United States of
America or the State of Texas shall not be regarded as a Business Day.

                                       A-3
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      "Capital Account" means the capital account maintained for a Partner
pursuant to Section 5.5. The "Capital Account" of a Partner in respect of a
General Partner Interest, a Common Unit, a Subordinated Unit, a Class B Unit, an
Incentive Distribution Right or any Partnership Interest shall be the amount
that such Capital Account would be if such General Partner Interest, Common
Unit, Subordinated Unit, Class B Unit, Incentive Distribution Right or other
Partnership Interest were the only interest in the Partnership held by such
Partner from and after the date on which such General Partner Interest, Common
Unit, Subordinated Unit, Incentive Distribution Right or other Partnership
Interest was first issued.

      "Capital Contribution" means any cash, cash equivalents or the Net Agreed
Value of Contributed Property that a Partner contributes to the Partnership.

      "Capital Improvement" means any (a) addition or improvement to the capital
assets owned by any Group Member, (b) acquisition of existing, or the
construction of new, capital assets (including, without limitation, oil and gas
leases, mineral interests, drilling rigs, gathering lines, treating facilities,
processing plants, pipelines and related or similar upstream assets) or (c)
capital contributions by a Group Member to a Person in which a Group Member has
an equity interest to fund such Group Member's pro rata share of the cost of the
acquisition of existing, or the construction of new, capital assets (including,
without limitation, oil and gas leases, mineral interests, drilling rigs,
gathering lines, treating facilities, processing plants, pipelines and related
or similar upstream assets) by such Person, in each case if such addition,
improvement, acquisition or construction is made to increase the production,
over the long term, from oil and gas properties or the operating capacity of
other assets of the Partnership Group, in the case of clauses (a) and (b), or
such Person, in the case of clause (c), from the production, over the long term,
or operating capacity of the Partnership Group or such Person, as the case may
be, existing immediately prior to such addition, improvement, acquisition or
construction.

      "Capital Surplus" has the meaning assigned to such term in Section 6.3(a).

      "Carrying Value" means (a) with respect to a Contributed Property, the
Agreed Value of such property reduced (but not below zero) by all depreciation,
depletion (including Simulated Depletion), amortization and cost recovery
deductions charged to the Partners' Capital Accounts in respect of such
Contributed Property, and (b) with respect to any other Partnership property,
the adjusted basis of such property for federal income tax purposes, all as of
the time of determination. The Carrying Value of any property shall be adjusted
from time to time in accordance with Section 5.5(d)(i) and Section 5.5(d)(ii)
and to reflect changes, additions or other adjustments to the Carrying Value for
dispositions and acquisitions of Partnership properties, as deemed appropriate
by the General Partner.

      "Cause" means a court of competent jurisdiction has entered a final,
non-appealable judgment finding the General Partner liable for actual fraud or
willful misconduct in its capacity as a general partner of the Partnership.

      "Certificate" means (a) a certificate (i) substantially in the form of
Exhibit A to this Agreement, (ii) issued in global form in accordance with the
rules and regulations of the Depository or (iii) in such other form as may be
adopted by the General Partner, issued by the Partnership evidencing ownership
of one or more Common Units or (b) a certificate, in such form as may be adopted
by the General Partner, issued by the Partnership evidencing ownership of one or
more other Partnership Securities.

      "Certificate of Limited Partnership" means the Certificate of Limited
Partnership of the Partnership filed with the Secretary of State of the State of
Delaware as referenced in Section 7.2, as such Certificate of Limited
Partnership may be amended, supplemented or restated from time to time.

      "CGas" means CGas Exploration, Inc., an Ohio corporation.

      "Citizenship Certification" means a properly completed certificate in such
form as may be specified by the General Partner by which a Limited Partner
certifies that he (and if he is a nominee holding for the account of another
Person, that to the best of his knowledge such other Person) is an Eligible
Citizen.

      "claim" (as used in Section 7.12(d)) has the meaning assigned to such term
in Section 7.12(d).

                                        A-4
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      "Class B Units" means a Partnership Security representing a factional part
of the Partnership Interests of all Limited Partners, and having the rights and
obligations specified with respect to Class B Units in this Agreement.

      "Closing Date" means the first date on which Common Units are sold by the
Partnership to the Underwriters pursuant to the provisions of the Underwriting
Agreement.

      "Closing Price" has the meaning assigned to such term in Section 15.1(a).

      "Code" means the Internal Revenue Code of 1986, as amended and in effect
from time to time. Any reference herein to a specific section or sections of the
Code shall be deemed to include a reference to any corresponding provision of
any successor law.

      "Combined Interest" has the meaning assigned to such term in Section
11.3(a).

      "Commission" means the United States Securities and Exchange Commission.

      "Common Unit" means a Partnership Security representing a fractional part
of the Partnership Interests of all Limited Partners and Assignees, and having
the rights and obligations specified with respect to Common Units in this
Agreement. The term "Common Unit" does not include a Subordinated Unit or Class
B Unit prior to its conversion into a Common Unit pursuant to the terms hereof
except to the extent specified in Section 5.11.

      "Common Unit Arrearage" means, with respect to any Common Unit, whenever
issued, as to any Quarter within the Subordination Period, the excess, if any,
of (a) the Minimum Quarterly Distribution with respect to a Common Unit in
respect of such Quarter over (b) the sum of all Available Cash distributed with
respect to a Common Unit in respect of such Quarter pursuant to Section
6.4(a)(i).

      "Conflicts Committee" means a committee of the Board of Directors of the
General Partner composed entirely of two or more directors, each of whom (a) is
not a security holder, officer or employee of the General Partner, (b) is not an
officer, director or employee of any Affiliate of the General Partner (c) is not
a holder of any ownership interest in the Partnership Group other than Common
Units and (d) meets the independence standards required of directors who serve
on an audit committee of a board of directors established by the Securities
Exchange Act and the rules and regulations of the Commission thereunder and by
the National Securities Exchange on which the Common Units are listed or
admitted to trading.

      "Contributed Property" means each property or other asset, in such form as
may be permitted by the Delaware Act, but excluding cash, contributed to the
Partnership. Once the Carrying Value of a Contributed Property is adjusted
pursuant to Section 5.5(d), such property shall no longer constitute a
Contributed Property, but shall be deemed an Adjusted Property.

      "Converted Common Units" has the meaning assigned to such term in Section
6.1(d)(x)(B).

      "Credit Agreement" means the Credit Agreement, dated as of , 2006, among
the Partnership, the Operating Partnership, the subsidiaries of the Operating
Partnership, and JPMorgan Chase Bank, N.A., as administrative agent for the
lenders named therein and any amendment, modification, renewal or replacement of
such Credit Agreement.

       "Cumulative Common Unit Arrearage" means, with respect to any Common Unit,
whenever issued, and as of the end of any Quarter, the excess, if any, of (a)
the sum resulting from adding together the Common Unit Arrearage as to an
Initial Common Unit for each of the Quarters within the Subordination Period
ending on or before the last day of such Quarter over (b) the sum of any
distributions theretofore made pursuant to Section 6.4(a)(ii) and the second
sentence of Section 6.5 with respect to an Initial Common Unit (including any
distributions to be made in respect of the last of such Quarters).

      "Curative Allocation" means any allocation of an item of income, gain,
deduction, loss or credit pursuant to the provisions of Section 6.1(d)(xi).

      "Current Market Price" has the meaning assigned to such term in Section
15.1(a).

                                       A-5
<PAGE>

      "Delaware Act" means the Delaware Revised Uniform Limited Partnership Act,
6 Del C. Section 17-101, et seq., as amended, supplemented or restated from time
to time, and any successor to such statute.

      "Departing General Partner" means a former General Partner from and after
the effective date of any withdrawal or removal of such former General Partner
pursuant to Section 11.1 or Section 11.2.

      "Depository" means, with respect to any Units issued in global form, The
Depository Trust Company and its successors and permitted assigns.

      "Economic Risk of Loss" has the meaning set forth in Treasury Regulation
Section 1.752-2(a).

      "Eligible Citizen" means a Person qualified to own interests in real
property in jurisdictions in which any Group Member does business or proposes to
do business from time to time, and whose status as a Limited Partner the General
Partner determines does not or would not subject such Group Member to a
significant risk of cancellation or forfeiture of any of its properties or any
interest therein.

      "EnCap Partnerships" means EnCap Energy Capital Fund V, L.P. a Texas
limited partnership, and EnCap V-B Acquisitions, L.P., a Texas limited
partnership.

      "EnerVest" means EnerVest Management Partners, Ltd., a Texas limited
partnership.

      "Estimated Incremental Quarterly Tax Amount" has the meaning assigned to
such term in Section 6.9.

      "Estimated Average Maintenance Capital Expenditures" means an estimate,
made in good faith, by the Board of Directors with the concurrence of the
Conflicts Committee of the average quarterly Maintenance Capital Expenditures
that the Partnership Group will incur over the long term. The Board of Directors
will be permitted to make such estimate in any manner it deems reasonable in its
sole discretion. The estimate will be made annually and whenever an event occurs
that is likely to result in a material adjustment to the amount of quarterly
Maintenance Capital Expenditures. The Partnership shall disclose to the Partners
the amount of Estimated Average Maintenance Capital Expenditures. Except as
provided in the definition of Subordination Period, any adjustments to Estimated
Average Maintenance Capital Expenditures shall be prospective only.

      "EVCG" means CGAS Properties, L.P., the Delaware limited partnership
formed to hold certain assets contributed by CGAS.

      "Event of Withdrawal" has the meaning assigned to such term in Section
11.1(a).

      "EVOC" means EnerVest Operating, L.L.C. a Texas limited liability company.

      "EV Investors" means EV Investors, L.P., a Delaware limited partnership.

      "Expansion Capital Expenditures" means cash expenditures for Acquisitions
or Capital Improvements, and shall not include Maintenance Capital Expenditures.

      "Final Subordinated Units" has the meaning assigned to such term in
Section 6.1(d)(x).

      "First Liquidation Target Amount" has the meaning assigned to such term in
Section 6.1(c)(i)(E).

      "First Target Distribution" means $0.40 per Unit per Quarter commencing
the Quarter ending December 31, 2006, subject to adjustment in accordance with
Section 5.11, Section 6.6 and Section 6.9.

      "Fully Diluted Basis" means, when calculating the number of Outstanding
Units for any period, a basis that includes, in addition to the Outstanding
Units, all Partnership Securities and options, rights, warrants and appreciation
rights relating to an equity interest in the Partnership (a) that are
convertible into or exercisable or exchangeable for Units that are senior to or
pari passu with the Subordinated Units, (b) whose conversion, exercise or
exchange price is less than the Current Market Price on the date of such
calculation, (c) that may be converted into or exercised or exchanged for such
Units prior to or during the Quarter immediately following the end of the period
for which the calculation is being made without the satisfaction of any
contingency beyond the control of the holder other than the payment of
consideration and the compliance with administrative mechanics applicable to
such conversion, exercise or exchange and (d) that were not converted into or
exercised or exchanged for such Units during the period for which the
calculation is being made;

                                       A-6
<PAGE>

provided, however, that for purposes of determining the number of Outstanding
Units on a Fully Diluted Basis when calculating whether the Subordination Period
has ended or Subordinated Units are entitled to convert into Common Units
pursuant to Section 5.7, such Partnership Securities, options, rights, warrants
and appreciation rights shall be deemed to have been Outstanding Units only for
the four Quarters that comprise the last four Quarters of the measurement
period; provided, further, that if consideration will be paid to any Group
Member in connection with such conversion, exercise or exchange, the number of
Units to be included in such calculation shall be that number equal to the
difference between (i) the number of Units issuable upon such conversion,
exercise or exchange and (ii) the number of Units that such consideration would
purchase at the Current Market Price.

      "General Partner" means EV Energy GP, L.P., a Delaware limited
partnership, and its successors and permitted assigns that are admitted to the
Partnership as general partner of the Partnership, in its capacity as general
partner of the Partnership (except as the context otherwise requires).

      "General Partner Interest" means the ownership interest of the General
Partner in the Partnership (in its capacity as a general partner without
reference to any Limited Partner Interest held by it), and includes any and all
benefits to which the General Partner is entitled as provided in this Agreement,
together with all obligations of the General Partner to comply with the terms
and provisions of this Agreement.

      "Group" means a Person that with or through any of its Affiliates or
Associates has any contract, arrangement, understanding or relationship for the
purpose of acquiring, holding, voting (except voting pursuant to a revocable
proxy or consent given to such Person in response to a proxy or consent
solicitation made to 10 or more Persons), exercising investment power or
disposing of any Partnership Interests with any other Person that beneficially
owns, or whose Affiliates or Associates beneficially own, directly or
indirectly, Partnership Interests.

       "Group Member" means a member of the Partnership Group.

      "Group Member Agreement" means the partnership agreement of any Group
Member, other than the Partnership, that is a limited or general partnership,
the limited liability company agreement of any Group Member that is a limited
liability company, the certificate of incorporation and bylaws or similar
organizational documents of any Group Member that is a corporation, the joint
venture agreement or similar governing document of any Group Member that is a
joint venture and the governing or organizational or similar documents of any
other Group Member that is a Person other than a limited or general partnership,
limited liability company, corporation or joint venture, as such may be amended,
supplemented or restated from time to time.

      "Hedge Contract" means any agreement with respect to any swap, forward,
future or derivative transaction or option or similar agreement, whether
exchange traded, "over-the-counter" or otherwise, involving, or settled by
reference to, one or more rates, currencies, commodities, equity or debt
instruments or securities, or economic, financial or pricing indices or measures
of economic, financial or pricing risk or value or any similar transaction or
any combination of these transactions; provided that no phantom stock or similar
plan providing for payments only on account of services provided by current or
former directors, officers, employees or consultants of a member of the
Partnership Group shall be a Hedge Contract. If a Hedge Contract provides for
settlement payments less frequently than quarterly, in calculating Operating
Surplus and Operating Expenses, the General Partner may allocate the settlement
payments over Quarterly periods in a manner approved by the Conflicts Committee.

      "Hedge Payment" means any payment made or received by a member of the
Partnership Group in connection with or pursuant to a Hedge Contract, including
periodic settlement payments, and payments made or received in connection with
the entering into, termination or modification of a Hedge Contract.

      "Holder" as used in Section 7.12, has the meaning assigned to such term in
Section 7.12(a).

      "Incentive Distribution Right" means a non-voting Limited Partner Interest
issued to the General Partner in connection with the transfer of all of its
interests in the general partner of the Interim Partnership to the Partnership,
which Limited Partner Interest will confer upon the holder thereof only the
rights and obligations

                                        A-7
<PAGE>

specifically provided in this Agreement with respect to Incentive Distribution
Rights (and no other rights otherwise available to or other obligations of a
holder of a Partnership Interest). Notwithstanding anything in this Agreement to
the contrary, the holder of an Incentive Distribution Right shall not be
entitled to vote such Incentive Distribution Right on any Partnership matter
except as may otherwise be required by law.

      "Incentive Distributions" means any amount of cash distributed to the
holders of the Incentive Distribution Rights pursuant to Section 6.4(a)(v)(B),
Section 6.4(a)(vi)(B), Section 6.4(b)(iii)(B), and Section 6.4(b)(iv)(B).

      "Indemnified Persons" has the meaning assigned to such term in Section
7.12(d).

      "Indemnitee" means (a) the General Partner, (b) any Departing General
Partner, (c) any Person who is or was an Affiliate of the General Partner or any
Departing General Partner, (d) the EnCap Partnerships and any Person who is or
was an Affiliate of the EnCap Partnerships (e) any Person who is or was a
member, partner, director, officer, fiduciary or trustee of any Group Member,
the General Partner or any Departing General Partner or any Affiliate of any
Group Member, the General Partner or any Departing General Partner, (f) any
Person who is or was serving at the request of the General Partner or any
Departing General Partner or any Affiliate of the General Partner or any
Departing General Partner as an officer, director, member, partner, fiduciary or
trustee of another Person; provided that a Person shall not be an Indemnitee by
reason of providing, on a fee-for-services basis, trustee, fiduciary or
custodial services, and (g) any Person the General Partner designates as an
"Indemnitee" for purposes of this Agreement.

      "Initial Common Units" means the Common Units sold in the Initial
Offering.

      "Initial Limited Partners" means the General Partner, EVOC, EnerVest,
EVCG, EV Investors and the EnCap Partnerships (with respect to the Common Units,
Subordinated Units and Incentive Distribution Rights received by them pursuant
to Section 5.2) and the Underwriters upon the issuance by the Partnership of
Common Units as described in Section 5.3 in connection with the Initial
Offering.

      "Initial Offering" means the initial offering and sale of Common Units to
the public, as described in the Registration Statement.

      "Initial Unit Price" means (a) with respect to the Common Units, the
initial public offering price per Common Unit at which the Underwriters offered
the Common Units to the public for sale as set forth on the cover page of the
prospectus included as part of the Registration Statement and first issued at or
after the time the Registration Statement first became effective or (b) with
respect to any other class or series of Units, the price per Unit at which such
class or series of Units is initially sold by the Partnership, as determined by
the General Partner, in each case adjusted as the General Partner determines to
be appropriate to give effect to any distribution, subdivision or combination of
Units.

      "Interim Capital Transactions" means the following transactions if they
occur prior to the Liquidation Date: (a) borrowings, refinancings or refundings
of indebtedness (other than Working Capital Borrowings and other than for items
purchased on open account in the ordinary course of business) by any Group
Member and sales of debt securities of any Group Member; (b) sales of equity
interests of any Group Member (including the Common Units sold to the
Underwriters pursuant to the exercise of the Over-Allotment Option); (c) sales
or other voluntary or involuntary dispositions of any assets of any Group Member
other than (i) sales or other dispositions of production, inventory, accounts
receivable and other assets in the ordinary course of business, and (ii) sales
or other dispositions of assets as part of normal retirements or replacements;
(d) the termination of commodity and interest rate swap agreements; (e) capital
contributions; (f) corporate reorganizations or restructurings; or (g) sales in
connection with plugging and abandoning and other reclamation activities for a
well in which a Group Member owns an interest.

      "Issue Price" means the price at which a Unit is purchased from the
Partnership, net of any sales commission or underwriting discount charged to the
Partnership.

      "Limited Partner" means, unless the context otherwise requires, the
Organizational Limited Partner prior to its withdrawal from the Partnership,
each Initial Limited Partner, each additional Person that becomes a Limited
Partner pursuant to the terms of this Agreement and any Departing General
Partner upon the change

                                      A-8
<PAGE>

of its status from General Partner to Limited Partner pursuant to Section 11.3,
in each case, in such Person's capacity as limited partner of the Partnership;
provided, however, that when the term "Limited Partner" is used herein in the
context of any vote or other approval, including Articles XIII and XIV, such
term shall not, solely for such purpose, include any holder of an Incentive
Distribution Right (solely with respect to its Incentive Distribution Rights and
not with respect to any other Limited Partner Interest held by such Person)
except as may otherwise be required by law.

      "Limited Partner Interest" means the ownership interest of a Limited
Partner or Assignee in the Partnership, which may be evidenced by Common Units,
Class B Units, Subordinated Units, Incentive Distribution Rights or other
Partnership Securities or a combination thereof or interest therein, and
includes any and all benefits to which such Limited Partner is entitled as
provided in this Agreement, together with all obligations of such Limited
Partner to comply with the terms and provisions of this Agreement; provided,
however, that when the term "Limited Partner Interest" is used herein in the
context of any vote or other approval, including Article XIII and Article XIV,
such term shall not, solely for such purpose, include any Incentive Distribution
Right except as may otherwise be required by law.

      "Liquidation Date" means (a) in the case of an event giving rise to the
dissolution of the Partnership of the type described in clauses (a) and (b) of
the first sentence of Section 12.2, the date on which the applicable time period
during which the holders of Outstanding Units have the right to elect to
continue the business of the Partnership has expired without such an election
being made, and (b) in the case of any other event giving rise to the
dissolution of the Partnership, the date on which such event occurs.

      "Liquidator" means one or more Persons selected by the General Partner to
perform the functions described in Section 12.4 as liquidating trustee of the
Partnership within the meaning of the Delaware Act.

      "Maintenance Capital Expenditures" means cash expenditures (including
expenditures for the addition or improvement to the capital assets owned by any
Group Member or for the acquisition of existing, or the construction of new,
capital assets) if such expenditures are made to maintain production levels of
the oil and gas properties of the Partnership Group over the long term or the
operating capacity of the other assets of the Partnership Group over the long
term.

      "Merger Agreement" has the meaning assigned to such term in Section 14.1.

      "Minimum Quarterly Distribution" means $0.40 per Unit per Quarter
commencing for the Quarter ending December 31, 2006, subject to adjustment in
accordance with Section 6.6 and Section 6.9.

      "National Securities Exchange" means an exchange registered with the
Commission under Section 6(a) of the Securities Exchange Act, and any successor
to such statute, or the Nasdaq Global Market, Nasdaq Global Select Market, or
any successor thereto.

      "Net Agreed Value" means, (a) in the case of any Contributed Property, the
Agreed Value of such property reduced by any liabilities either assumed by the
Partnership upon such contribution or to which such property is subject when
contributed, (b) in the case of any property distributed to a Partner by the
Partnership, the Partnership's Carrying Value of such property (as adjusted
pursuant to Section 5.5(d)(ii)) at the time such property is distributed,
reduced by any indebtedness either assumed by such Partner or Assignee upon such
distribution or to which such property is subject at the time of distribution,
in either case, as determined under Section 752 of the Code.

       "Net Income" means, for any taxable year, the excess, if any, of the
Partnership's items of income and gain (other than those items taken into
account in the computation of Net Termination Gain or Net Termination Loss) for
such taxable year over the Partnership's items of loss and deduction (other than
those items taken into account in the computation of Net Termination Gain or Net
Termination Loss) for such taxable year. The items included in the calculation
of Net Income shall be determined in accordance with Section 5.5(b) and shall
include Simulated Gains, Simulated Losses and Simulated Depletion, but shall not
include any items specially allocated under Section 6.1(d); provided, that the
determination of the items that have been specially allocated under Section
6.1(d) shall be made as if Section 6.1(d)(xii) were not in this Agreement.

                                       A-9
<PAGE>

      "Net Loss" means, for any taxable year, the excess, if any, of the
Partnership's items of loss and deduction (other than those items taken into
account in the computation of Net Termination Gain or Net Termination Loss) for
such taxable year over the Partnership's items of income and gain (other than
those items taken into account in the computation of Net Termination Gain or Net
Termination Loss) for such taxable year. The items included in the calculation
of Net Loss shall be determined in accordance with Section 5.5(b) and shall
include Simulated Gains, Simulated Losses and Simulated Depletion, but shall not
include any items specially allocated under Section 6.1(d); provided, that the
determination of the items that have been specially allocated under Section
6.1(d) shall be made as if Section 6.1(d)(xii) were not in this Agreement.

      "Net Positive Adjustments" means, with respect to any Partner, the excess,
if any, of the total positive adjustments over the total negative adjustments
made to the Capital Account of such Partner pursuant to Book-Up Events and
Book-Down Events.

      "Net Termination Gain" means, for any taxable year, the sum, if positive,
of all items of income, gain, loss or deduction recognized by the Partnership
after the Liquidation Date. The items included in the determination of Net
Termination Gain shall be determined in accordance with Section 5.5(b) and shall
include Simulated Gains, Simulated Losses and Simulated Depletion, but shall not
include any items of income, gain or loss specially allocated under Section
6.1(d).

      "Net Termination Loss" means, for any taxable year, the sum, if negative,
of all items of income, gain, loss or deduction recognized by the Partnership
after the Liquidation Date. The items included in the determination of Net
Termination Loss shall be determined in accordance with Section 5.5(b) and shall
include Simulated Gains, Simulated Losses and Simulated Depletion, but shall not
include any items of income, gain or loss specially allocated under Section
6.1(d).

      "Non-citizen Assignee" means a Person whom the General Partner has
determined does not constitute an Eligible Citizen and as to whose Partnership
Interest the General Partner has become the Substituted Limited Partner,
pursuant to Section 4.9.

      "Nonrecourse Built-in Gain" means with respect to any Contributed
Properties or Adjusted Properties that are subject to a mortgage or pledge
securing a Nonrecourse Liability, the amount of any taxable gain that would be
allocated to the Partners pursuant to Section 6.2(d)(i)(A), Section
6.2(d)(ii)(A), and Section 6.2(d)(iii) if such properties were disposed of in a
taxable transaction in full satisfaction of such liabilities and for no other
consideration.

      "Nonrecourse Deductions" means any and all items of loss, deduction,
expenditure (including any expenditure described in Section 705(a)(2)(B) of the
Code), Simulated Depletion or Simulated Loss that, in accordance with the
principles of Treasury Regulation Section 1.704-2(b), are attributable to a
Nonrecourse Liability.

      "Nonrecourse Liability" has the meaning set forth in Treasury Regulation
Section 1.752-1(a)(2).

      "Notice of Election to Purchase" has the meaning assigned to such term in
Section 15.1(b).

      "Omnibus Agreement" means that certain Omnibus Agreement, dated as of the
Closing Date, among the General Partner, the Partnership, the Operating
Partnership, EVOC, EnerVest, EV Investors, the EnCap Partnerships and certain
other parties thereto, as such may be amended, supplemented or restated from
time to time.

      "Operating Agreement" means the Joint Operating Agreement between the
Partnership, the Operating Partnership, EVOC and current and future subsidiaries
of the Operating Partnership pursuant to which EVOC will act as operator of
wells owned by members of the Partnership Group, as amended from time to time.

       "Operating Expenditures" means all Partnership Group cash expenditures,
including, but not limited to, taxes, reimbursements of the General Partner, in
accordance with this Agreement, interest payments,

                                      A-10
<PAGE>

repayment of Working Capital Borrowings, and non-Pro Rata repurchases of Units
(other than those made with the proceeds of an Interim Capital Transaction), but
excluding, subject to the following:

            (a) payments (including prepayments and prepayment penalties) of
      principal of and premium on indebtedness other than Working Capital
      Borrowings shall not constitute Operating Expenditures;

            (b) Operating Expenditures shall not include Expansion Capital
      Expenditures or actual Maintenance Capital Expenditures, but shall include
      Estimated Average Maintenance Capital Expenditures;

            (c) Operating Expenditures shall not include (i) payment of
      transaction expenses (including taxes) relating to Interim Capital
      Transactions or (ii) distributions to Partners;

            (d) Operating Expenditures shall not include interest on borrowings
      used to construct capital assets from the period commencing when the
      borrowings are made until the construction of the capital assets is
      completed or abandoned; and

            (e) Operating Expenditures in any Quarter shall include all Hedge
      Payments made by a member of the Partnership Group during such Quarter,
      provided, however, that the General Partner may treat all or any portion
      of any Hedge Payment as a Maintenance Capital Expenditure or Expansion
      Capital Expenditure, or may allocate a Hedge Payment among one or more
      Quarters, in either case with the approval of the Conflicts Committee.

            (f) Cash expenditures made solely for investment purposes pending
      use of the amounts invested shall not be deemed Operating Expenditures.

      "Operating Partnership" means EV Properties, L.P., a Delaware limited
partnership, the limited partner interest of which was acquired by the
Partnership and any successors thereto.

      "Operating Surplus" means, with respect to any period ending prior to the
Liquidation Date, on a cumulative basis and without duplication,

            (a) the sum of (i) an amount equal to two times the amount needed
      for any one Quarter for the Partnership to pay the Minimum Quarterly
      Distribution on all Units and the related distribution on the General
      Partner Interest, (ii) all cash receipts of the Partnership Group for the
      period beginning on the Closing Date and ending on the last day of such
      period, but excluding cash receipts from Interim Capital Transactions
      (except to the extent specified in Section 6.5), (iii) any decrease made
      during the period in cash reserves for Operating Expenditures, and (iv)
      all cash receipts of the Partnership Group after the end of such period
      but on or before the date of determination of Operating Surplus with
      respect to such period resulting from Working Capital Borrowings, less

            (b) the sum of (i) Operating Expenditures for the period beginning
      on the Closing Date and ending on the last day of such period (other than
      Operating Expenditures funded with cash reserves established by the
      General Partner pursuant to clause (iii) of this Paragraph (b)) and (ii)
      the amount of cash reserves established by the General Partner to provide
      funds for future Operating Expenditures; provided, however, that
      disbursements made (including contributions to a Group Member or
      disbursements on behalf of a Group Member) or cash reserves established,
      increased or reduced after the end of such period but on or before the
      date of determination of Available Cash with respect to such period shall
      be deemed to have been made, established, increased or reduced, for
      purposes of determining Operating Surplus, within such period if the
      General Partner so determines.

      Notwithstanding the foregoing, (i) the General Partner may treat all or
any portion of any Hedge Payment received by a member of the Partnership Group
as an Interim Capital Transaction or may allocate such payment received over one
or more Quarters, in either case with the approval of the Conflicts Committee
and (ii) "Operating Surplus" with respect to the Quarter in which the
Liquidation Date occurs and any subsequent Quarter shall equal zero.

      "Opinion of Counsel" means a written opinion of counsel (who may be
regular counsel to the Partnership or the General Partner or any of its
Affiliates) acceptable to the General Partner.

                                      A-11
<PAGE>

      "Option Closing Date" means the date or dates on which any Common Units
are sold by the Partnership to the Underwriters upon exercise of the
Over-Allotment Option.

      "Organizational Limited Partner" means EnerVest in its capacity as the
organizational limited partner of the Partnership pursuant to this Agreement.

      "Outstanding" means, with respect to Partnership Securities, all
Partnership Securities that are issued by the Partnership and reflected as
outstanding on the Partnership's books and records as of the date of
determination; provided, however, that if at any time any Person or Group (other
than the General Partner or its Affiliates or the EnCap Partnerships)
beneficially owns 20% or more of the Outstanding Partnership Securities of any
class then Outstanding, all Partnership Securities owned by such Person or Group
shall not be voted on any matter and shall not be considered to be Outstanding
when sending notices of a meeting of Limited Partners to vote on any matter
(unless otherwise required by law), calculating required votes, determining the
presence of a quorum or for other similar purposes under this Agreement, except
that Units so owned shall be considered to be Outstanding for purposes of
Section 11.1(b)(iv) (such Units shall not, however, be treated as a separate
class of Partnership Securities for purposes of this Agreement); provided,
further, that the foregoing limitation shall not apply to (i) any Person or
Group who acquired 20% or more of the Outstanding Partnership Securities of any
class then Outstanding directly from the General Partner or its Affiliates, (ii)
any Person or Group who acquired 20% or more of the Outstanding Partnership
Securities of any class then Outstanding directly or indirectly from a Person or
Group described in clause (i) provided that the General Partner shall have
notified such Person or Group in writing that such limitation shall not apply,
or (iii) any Person or Group who acquired 20% or more of any Partnership
Securities issued by the Partnership with the prior approval of the Board of
Directors.

      "Over-Allotment Option" means the over-allotment option granted to the
Underwriters by the Partnership pursuant to the Underwriting Agreement.

      "Partner Nonrecourse Debt" has the meaning set forth in Treasury
Regulation Section 1.704-2(b)(4).

      "Partner Nonrecourse Debt Minimum Gain" has the meaning set forth in
Treasury Regulation Section 1.704-2(i)(2).

      "Partner Nonrecourse Deductions" means any and all items of loss,
deduction, expenditure (including any expenditure described in Section
705(a)(2)(B) of the Code), Simulated Depletion or Simulated Loss that, in
accordance with the principles of Treasury Regulation Section 1.704-2(i), are
attributable to a Partner Nonrecourse Debt.

      "Partners" means the General Partner and the Limited Partners.

      "Partnership" means EV Energy Partners, L.P., a Delaware limited
partnership.

      "Partnership Group" means the Partnership and its Subsidiaries treated as
a single consolidated entity.

      "Partnership Interest" means an interest in the Partnership, which shall
include the General Partner Interest and Limited Partner Interests.

      "Partnership Minimum Gain" means that amount determined in accordance with
the principles of Treasury Regulation Section 1.704-2(d).

       "Partnership Security" means any class or series of equity interest in the
Partnership (but excluding any options, rights, warrants and appreciation rights
relating to an equity interest in the Partnership), including Common Units,
Class B Units, Subordinated Units, General Partner Interest and Incentive
Distribution Rights.

      "Per Unit Capital Amount" means, as of any date of determination, the
Capital Account, stated on a per Unit basis, underlying any Unit held by a
Person other than the General Partner or any Affiliate of the General Partner
who holds Units.

      "Percentage Interest" means as of any date of determination (a) as to the
General Partner with respect to the General Partner Interest, the aggregate
Capital Contributions made by the General Partner with respect to the General
Partner divided by the aggregate Capital Contributions made by all the Partners,
(b) as to any

                                      A-12
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Unitholder with respect to Units, the product obtained by multiplying (i) 100%
less the percentage applicable to clause (a) above and (c) below by (ii) the
quotient obtained by dividing the number of Units held by such Unitholder by the
total number of Outstanding Units and (c) as to the holders of other Partnership
Securities issued by the Partnership in accordance with Section 5.6, the
percentage established as a part of such issuance. The Percentage Interest with
respect to an Incentive Distribution Right shall at all times be zero.

      "Person" means an individual or a corporation, firm, limited liability
company, partnership, joint venture, trust, unincorporated organization,
association, government agency or political subdivision thereof or other entity.

      "Pro Rata" means (a) when used with respect to Units or any class thereof,
apportioned equally among all designated Units in accordance with their relative
Percentage Interests, (b) when used with respect to Partners and Assignees or
Record Holders, apportioned among all Partners and Assignees or Record Holders
in accordance with their relative Percentage Interests and (c) when used with
respect to holders of Incentive Distribution Rights, apportioned equally among
all holders of Incentive Distribution Rights in accordance with the relative
number or percentage of Incentive Distribution Rights held by each such holder.

      "Properties Partnership" means EV Acquisition Partners, L.P., a Delaware
limited partnership.

      "Purchase Date" means the date determined by the General Partner as the
date for purchase of all Outstanding Limited Partner Interests of a certain
class (other than Limited Partner Interests owned by the General Partner and its
Affiliates) pursuant to Article XV.

      "Quarter" means, unless the context requires otherwise, a fiscal quarter
of the Partnership, or, with respect to the first fiscal quarter of the
Partnership after the Closing Date, the portion of such fiscal quarter after the
Closing Date.

      "Recapture Income" means any gain recognized by the Partnership (computed
without regard to any adjustment required by Section 734 or Section 743 of the
Code) upon the disposition of any property or asset of the Partnership, which
gain is characterized as ordinary income because it represents the recapture of
deductions previously taken with respect to such property or asset.

      "Record Date" means the date established by the General Partner or
otherwise in accordance with this Agreement for determining (a) the identity of
the Record Holders entitled to notice of, or to vote at, any meeting of Limited
Partners or entitled to vote by ballot or give approval of Partnership action in
writing without a meeting or entitled to exercise rights in respect of any
lawful action of Limited Partners or (b) the identity of Record Holders entitled
to receive any report or distribution or to participate in any offer.

      "Record Holder" means the Person in whose name a Common Unit is registered
on the books of the Transfer Agent as of the opening of business on a particular
Business Day, or with respect to other Partnership Interests, the Person in
whose name any such other Partnership Interest is registered on the books that
the General Partner has caused to be kept as of the opening of business on such
Business Day.

      "Redeemable Interests" means any Partnership Interests for which a
redemption notice has been given, and has not been withdrawn, pursuant to
Section 4.10.

      "Registration Statement" means the Registration Statement on Form S-1 as
it has been or as it may be amended or supplemented from time to time, filed by
the Partnership with the Commission under the Securities Act to register the
offering and sale of the Common Units in the Initial Offering.

      "Remaining Net Positive Adjustments" means as of the end of any taxable
period, (i) with respect to the Unitholders holding Common Units, Class B Units
or Subordinated Units, the excess of (a) the Net Positive Adjustments of the
Unitholders holding Common Units, Class B Units or Subordinated Units as of the
end of such period over (b) the sum of those Partners' Share of Additional Book
Basis Derivative Items for each prior taxable period, (ii) with respect to the
General Partner (as holder of the General Partner Interest), the excess of (a)
the Net Positive Adjustments of the General Partner as of the end of such period
over (b) the sum of the General Partner's Share of Additional Book Basis
Derivative Items with respect to the General Partner Interest for each prior
taxable period, and (iii) with respect to the holders of Incentive Distribution

                                      A-13
<PAGE>

Rights, the excess of (a) the Net Positive Adjustments of the holders of
Incentive Distribution Rights as of the end of such period over (b) the sum of
the Share of Additional Book Basis Derivative Items of the holders of the
Incentive Distribution Rights for each prior taxable period.

      "Required Allocations" means (a) any limitation imposed on any allocation
of Net Losses or Net Termination Losses under Section 6.1(b) or Section
6.1(c)(ii) and (b) any allocation of an item of income, gain, loss, deduction,
Simulated Depletion or Simulated Loss pursuant to Section 6.1(d)(i), Section
6.1(d)(ii), Section 6.1(d)(iv), Section 6.1(d)(v), Section 6.1(d)(vii) or
Section 6.1(d)(ix).

       "Residual Gain" or "Residual Loss" means any item of gain or loss, as the
case may be, of the Partnership recognized for federal income tax purposes
resulting from a sale, exchange or other disposition of a Contributed Property
or Adjusted Property, to the extent such item of gain or loss or Simulated Gain
or Simulated Loss is not allocated pursuant to Section 6.2(d)(i)(A) or Section
6.2(d)(ii)(A), respectively, to eliminate Book-Tax Disparities.

      "Retained Converted Subordinated Unit" has the meaning assigned to such
term in Section 5.5(c)(ii).

      "Second Liquidation Target Amount" has the meaning assigned to such term
in Section 6.1(c)(i)(F).

      "Second Target Distribution" means $0.46 per Unit per Quarter, subject to
adjustment in accordance with Section 5.11, Section 6.6 and Section 6.9.

      "Securities Act" means the Securities Act of 1933, as amended,
supplemented or restated from time to time and any successor to such statute.

      "Securities Exchange Act" means the Securities Exchange Act of 1934, as
amended, supplemented or restated from time to time and any successor to such
statute.

      "Share of Additional Book Basis Derivative Items" means in connection with
any allocation of Additional Book Basis Derivative Items for any taxable period,
(i) with respect to the Unitholders holding Common Units, Class B Units or
Subordinated Units, the amount that bears the same ratio to such Additional Book
Basis Derivative Items as the Unitholders' Remaining Net Positive Adjustments as
of the end of such period bears to the Aggregate Remaining Net Positive
Adjustments as of that time, (ii) with respect to the General Partner (as holder
of the General Partner Interest), the amount that bears the same ratio to such
Additional Book Basis Derivative Items as the General Partner's Remaining Net
Positive Adjustments as of the end of such period bears to the Aggregate
Remaining Net Positive Adjustment as of that time, and (iii) with respect to the
Partners holding Incentive Distribution Rights, the amount that bears the same
ratio to such Additional Book Basis Derivative Items as the Remaining Net
Positive Adjustments of the Partners holding the Incentive Distribution Rights
as of the end of such period bears to the Aggregate Remaining Net Positive
Adjustments as of that time.

      "Simulated Basis" means the Carrying Value of any oil and gas property (as
defined in Section 614 of the Code).

      "Simulated Depletion" means, with respect to an oil and gas property (as
defined in Section 614 of the Code), a depletion allowance computed in
accordance with federal income tax principles (as if the Simulated Basis of the
property was its adjusted tax basis) and in the manner specified in Treasury
Regulation Section 1.704-1(b)(2)(iv)(k)(2). For purposes of computing Simulated
Depletion with respect to any property, the Simulated Basis of such property
shall be deemed to be the Carrying Value of such property, and in no event shall
such allowance for Simulated Depletion, in the aggregate, exceed such Simulated
Basis.

      "Simulated Gain" means the excess of the amount realized from the sale or
other disposition of an oil or gas property over the Carrying Value of such
property.

      "Simulated Loss" means the excess of the Carrying Value of an oil or gas
property over the amount realized from the sale or other disposition of such
property.

      "Special Approval" means approval by a majority of the members of the
Conflicts Committee.

                                      A-14
<PAGE>

      "Subordinated Unit" means a Partnership Security representing a fractional
part of the Partnership Interests of all Limited Partners and Assignees and
having the rights and obligations specified with respect to Subordinated Units
in this Agreement. The term "Subordinated Unit" does not include a Common Unit
or Class B Unit. A Subordinated Unit that is convertible into a Common Unit
shall not constitute a Common Unit until such conversion occurs.

      "Subordination Period" means the period commencing on the Closing Date and
ending on the first to occur of the following dates:

            (a) the first day of any Quarter beginning after September 30, 2011
      in respect of which (i) (A) distributions of Available Cash from Operating
      Surplus on each of the Outstanding Common Units and Subordinated Units and
      any other Outstanding Units that are senior or equal in right of
      distribution to the Subordinated Units with respect to each of the three
      consecutive, non-overlapping four-Quarter periods immediately preceding
      such date equaled or exceeded the sum of (x) the Minimum Quarterly
      Distribution on all Outstanding Common Units and Subordinated Units and
      any other Outstanding Units that are senior or equal in right of
      distribution to the Subordinated Units plus (y) the General Partner
      Interest during such periods and (B) the Adjusted Operating Surplus for
      each of the three consecutive, non-overlapping four-Quarter periods
      immediately preceding such date equaled or exceeded the sum of (x) the
      Minimum Quarterly Distribution on all of the Common Units, Subordinated
      Units and any other Units that are senior or equal in right of
      distribution to the Subordinated Units that were Outstanding during such
      periods on a Fully Diluted Basis, plus (y) the related distribution on the
      General Partner Interest, with respect to each such period and (ii) there
      are no Cumulative Common Unit Arrearages;

            (b) the first date on which there are no longer outstanding any
      Subordinated Units due to the conversion of Subordinated Units into Common
      Units pursuant to Section 5.7 or otherwise; and

            (c) the date on which the General Partner is removed as general
      partner of the Partnership upon the requisite vote by holders of
      Outstanding Units under circumstances where Cause does not exist and Units
      held by the General Partner and its Affiliates are not voted in favor of
      such removal.

      For purposes of determining whether the test in subclause (a)(i)(B) above
has been satisfied, Adjusted Operating Surplus will be adjusted upwards or
downwards if the Conflicts Committee determines in good faith that the amount of
Estimated Average Maintenance Capital Expenditures used in the determination of
Adjusted Operating Surplus in subclause (a)(i)(B) was materially incorrect,
based on circumstances prevailing at the time of original determination of
Estimated Average Maintenance Capital Expenditures, for any one or more of the
preceding four quarter periods.

      "Subsidiary" means, with respect to any Person, (a) a corporation of which
more than 50% of the voting power of shares entitled (without regard to the
occurrence of any contingency) to vote in the election of directors or other
governing body of such corporation is owned, directly or indirectly, at the date
of determination, by such Person, by one or more Subsidiaries of such Person or
a combination thereof, (b) a partnership (whether general or limited) in which
such Person or a Subsidiary of such Person is, at the date of determination, a
general or limited partner of such partnership, but only if more than 50% of the
partnership interests of such partnership (considering all of the partnership
interests of the partnership as a single class) is owned, directly or
indirectly, at the date of determination, by such Person, by one or more
Subsidiaries of such Person, or a combination thereof, or (c) any other Person
(other than a corporation or a partnership) in which such Person, one or more
Subsidiaries of such Person, or a combination thereof, directly or indirectly,
at the date of determination, has (i) at least a majority ownership interest or
(ii) the power to elect or direct the election of a majority of the directors or
other governing body of such Person.

      "Surviving Business Entity" has the meaning assigned to such term in
Section 14.2(b).

      "Target Distribution" means, collectively, the First Target Distribution
and Second Target Distribution.

      "Trading Day" has the meaning assigned to such term in Section 15.1(a).

      "transfer" has the meaning assigned to such term in Section 4.4(a).

                                      A-15
<PAGE>

      "Transfer Agent" means such bank, trust company or other Person (including
the General Partner or one of its Affiliates) as shall be appointed from time to
time by the General Partner to act as registrar and transfer agent for the
Common Units; provided, that if no Transfer Agent is specifically designated for
any other Partnership Securities, the General Partner shall act in such
capacity.

      "Underwriter" means each Person named as an underwriter in Schedule I to
the Underwriting Agreement who purchases Common Units pursuant thereto.

      "Underwriting Agreement" means that certain Underwriting Agreement dated
as of , 2006, among the Underwriters, the Partnership, the General Partner, the
Operating Partnership and other parties thereto, providing for the purchase of
Common Units by the Underwriters.

      "Unit" means a Partnership Security that is designated as a "Unit" and
shall include Common Units, Class B Units and Subordinated Units, each a
separate class, but shall not include (i) the General Partner Interest or (ii)
Incentive Distribution Rights.

      "Unit Majority" means (i) during the Subordination Period, at least a
majority of the Outstanding Common Units (excluding Common Units owned by the
General Partner and its Affiliates), voting as a class and at least a majority
of the Outstanding Subordinated Units, voting as a class, and (ii) after the end
of the Subordination Period, at least a majority of the Outstanding Common Units
and Class B Units, if any, voting as a single class.

      "Unitholders" means the holders of Units.

      "Unpaid MQD" has the meaning assigned to such term in Section
6.1(c)(i)(B).

      "Unrealized Gain" attributable to any item of Partnership property means,
as of any date of determination, the excess, if any, of (a) the fair market
value of such property as of such date (as determined under Section 5.5(d)) over
(b) the Carrying Value of such property as of such date (prior to any adjustment
to be made pursuant to Section 5.5(d) as of such date).

      "Unrealized Loss" attributable to any item of Partnership property means,
as of any date of determination, the excess, if any, of (a) the Carrying Value
of such property as of such date (prior to any adjustment to be made pursuant to
Section 5.5(d) as of such date) over (b) the fair market value of such property
as of such date (as determined under Section 5.5(d)).

      "Unrecovered Initial Unit Price" means at any time, with respect to a
Unit, the Initial Unit Price less the sum of all distributions constituting
Capital Surplus theretofore made in respect of an Initial Common Unit and any
distributions of cash (or the Net Agreed Value of any distributions in kind) in
connection with the dissolution and liquidation of the Partnership theretofore
made in respect of an Initial Common Unit, adjusted as the General Partner
determines to be appropriate to give effect to any distribution, subdivision or
combination of such Units.

      "U.S. GAAP" means United States generally accepted accounting principles
consistently applied.

      "Withdrawal Opinion of Counsel" has the meaning assigned to such term in
Section 11.1(b).

      "Working Capital Borrowings" means borrowings used solely for working
capital purposes or to pay distributions to Partners made pursuant to a credit
facility or other arrangement requiring all such borrowings thereunder to be
reduced to a relatively small amount each year (or for the year in which the
Initial Offering is consummated, the 12-month period beginning on the Closing
Date) for an economically meaningful period of time.

      SECTION 1.2 Construction. Unless the context requires otherwise: (a) any
pronoun used in this Agreement shall include the corresponding masculine,
feminine or neuter forms, and the singular form of nouns, pronouns and verbs
shall include the plural and vice versa; (b) references to Articles and Sections
refer to Articles and Sections of this Agreement; (c) the terms "include",
"includes", "including" or words of like import shall be deemed to be followed
by the words "without limitation"; and (d) the terms "hereof", "herein" or
"hereunder" refer to this Agreement as a whole and not to any particular
provision of this Agreement. The

                                      A-16
<PAGE>

table of contents and headings contained in this Agreement are for reference
purposes only, and shall not affect in any way the meaning or interpretation of
this Agreement.

                                   ARTICLE II.

                                  Organization

      SECTION 2.1 Formation. The General Partner and the Organizational Limited
Partner have previously formed the Partnership as a limited partnership pursuant
to the provisions of the Delaware Act and hereby amend and restate the original
Agreement of Limited Partnership of EV Energy Partners, L.P. in its entirety.
This amendment and restatement shall become effective on the date of this
Agreement. Except as expressly provided to the contrary in this Agreement, the
rights, duties (including fiduciary duties), liabilities and obligations of the
Partners and the administration, dissolution and termination of the Partnership
shall be governed by the Delaware Act. All Partnership Interests shall
constitute personal property of the owner thereof for all purposes.

      SECTION 2.2 Name. The name of the Partnership shall be "EV Energy
Partners, L.P." The Partnership's business may be conducted under any other name
or names as determined by the General Partner, including the name of the General
Partner. The words "Limited Partnership," "L.P.," "Ltd." or similar words or
letters shall be included in the Partnership's name where necessary for the
purpose of complying with the laws of any jurisdiction that so requires. The
General Partner may change the name of the Partnership at any time and from time
to time and shall notify the Limited Partners of such change in the next regular
communication to the Limited Partners.

      SECTION 2.3 Registered Office; Registered Agent; Principal Office; Other
Offices. Unless and until changed by the General Partner, the registered office
of the Partnership in the State of Delaware shall be located at 1209 Orange
Street, Wilmington, Delaware 19801, and the registered agent for service of
process on the Partnership in the State of Delaware at such registered office
shall be The Corporation Trust Company. The principal office of the Partnership
shall be located at 1001 Fannin Street, Suite 800, Houston, Texas 77002-6708, or
such other place as the General Partner may from time to time designate by
notice to the Limited Partners. The Partnership may maintain offices at such
other place or places within or outside the State of Delaware as the General
Partner shall determine necessary or appropriate. The address of the General
Partner shall be 1001 Fannin Street, Suite 800, Houston, Texas 77002-6708, or
such other place as the General Partner may from time to time designate by
notice to the Limited Partners.

      SECTION 2.4 Purpose and Business. The purpose and nature of the business
to be conducted by the Partnership shall be to (a) engage directly in, or enter
into or form, hold and dispose of any corporation, partnership, joint venture,
limited liability company or other arrangement to engage indirectly in, any
business activity that is approved by the General Partner and that lawfully may
be conducted by a limited partnership organized pursuant to the Delaware Act
and, in connection therewith, to exercise all of the rights and powers conferred
upon the Partnership pursuant to the agreements relating to such business
activity, and (b) do anything necessary or appropriate to the foregoing,
including the making of capital contributions or loans to a Group Member;
provided, however, that the General Partner shall not cause the Partnership to
engage, directly or indirectly, in any business activity that the General
Partner determines would cause the Partnership to be treated as an association
taxable as a corporation or otherwise taxable as an entity for federal income
tax purposes. To the fullest extent permitted by law, the General Partner shall
have no duty or obligation to propose or approve, and may decline to propose or
approve, the conduct by the Partnership of any business free of any fiduciary
duty or obligation whatsoever to the Partnership or any Limited Partner and, in
declining to so propose or approve, shall not be required to act in good faith
or pursuant to any other standard imposed by this Agreement, any Group Member
Agreement, any other agreement contemplated hereby or under the Delaware Act or
any other law, rule or regulation or at equity.

      SECTION 2.5 Powers. The Partnership shall be empowered to do any and all
acts and things necessary or appropriate for the furtherance and accomplishment
of the purposes and business described in Section 2.4 and for the protection and
benefit of the Partnership.

                                      A-17
<PAGE>

      SECTION 2.6 Power of Attorney.

      (a) Each Limited Partner hereby constitutes and appoints the General
Partner and, if a Liquidator shall have been selected pursuant to Section 12.3,
the Liquidator (and any successor to the Liquidator by merger, transfer,
assignment, election or otherwise) and each of their authorized officers and
attorneys-in-fact, as the case may be, with full power of substitution, as his
true and lawful agent and attorney-in-fact, with full power and authority in his
name, place and stead, to:

            (i) execute, swear to, acknowledge, deliver, file and record in the
      appropriate public offices (A) all certificates, documents and other
      instruments (including this Agreement and the Certificate of Limited
      Partnership and all amendments or restatements hereof or thereof) that the
      General Partner or the Liquidator determines to be necessary or
      appropriate to form, qualify or continue the existence or qualification of
      the Partnership as a limited partnership (or a partnership in which the
      limited partners have limited liability) in the State of Delaware and in
      all other jurisdictions in which the Partnership may conduct business or
      own property; (B) all certificates, documents and other instruments that
      the General Partner or the Liquidator determines to be necessary or
      appropriate to reflect, in accordance with its terms, any amendment,
      change, modification or restatement of this Agreement; (C) all
      certificates, documents and other instruments (including conveyances and a
      certificate of cancellation) that the General Partner or the Liquidator
      determines to be necessary or appropriate to reflect the dissolution and
      liquidation of the Partnership pursuant to the terms of this Agreement;
      (D) all certificates, documents and other instruments relating to the
      admission, withdrawal, removal or substitution of any Partner pursuant to,
      or other events described in, Article IV, Article X, Article XI or Article
      XII; (E) all certificates, documents and other instruments relating to the
      determination of the rights, preferences and privileges of any class or
      series of Partnership Securities issued pursuant to Section 5.6; and (F)
      all certificates, documents and other instruments (including agreements
      and a certificate of merger) relating to a merger, consolidation or
      conversion of the Partnership pursuant to Article XIV; and

            (ii) execute, swear to, acknowledge, deliver, file and record all
      ballots, consents, approvals, waivers, certificates, documents and other
      instruments that the General Partner or the Liquidator determines to be
      necessary or appropriate to make, evidence, give, confirm or ratify any
      vote, consent, approval, agreement or other action that is made or given
      by the Partners hereunder or is consistent with the terms of this
      Agreement or effectuate the terms or intent of this Agreement; provided,
      that when required by Section 13.3 or any other provision of this
      Agreement that establishes a percentage of the Limited Partners or of the
      Limited Partners of any class or series required to take any action, the
      General Partner and the Liquidator may exercise the power of attorney made
      in this Section 2.6(a)(ii) only after the necessary vote, consent or
      approval of the Limited Partners or of the Limited Partners of such class
      or series, as applicable.

Nothing contained in this Section 2.6(a) shall be construed as authorizing the
General Partner to amend this Agreement except in accordance with Article XIII
or as may be otherwise expressly provided for in this Agreement.

      (b) The foregoing power of attorney is hereby declared to be irrevocable
and a power coupled with an interest, and it shall survive and, to the maximum
extent permitted by law, not be affected by the subsequent death, incompetency,
disability, incapacity, dissolution, bankruptcy or termination of any Limited
Partner and the transfer of all or any portion of such Limited Partner's
Partnership Interest and shall extend to such Limited Partner's heirs,
successors, assigns and personal representatives. Each such Limited Partner
hereby agrees to be bound by any representation made by the General Partner or
the Liquidator acting in good faith pursuant to such power of attorney; and each
such Limited Partner, to the maximum extent permitted by law, hereby waives any
and all defenses that may be available to contest, negate or disaffirm the
action of the General Partner or the Liquidator taken in good faith under such
power of attorney. Each Limited Partner shall execute and deliver to the General
Partner or the Liquidator, within 15 days after receipt of the request therefor,
such further designation, powers of attorney and other instruments as the
General Partner or the Liquidator may request in order to effectuate this
Agreement and the purposes of the Partnership.

                                      A-18
<PAGE>

      SECTION 2.7 Term. The term of the Partnership commenced upon the filing of
the Certificate of Limited Partnership in accordance with the Delaware Act and
shall continue in existence until the dissolution of the Partnership in
accordance with the provisions of Article XII. The existence of the Partnership
as a separate legal entity shall continue until the cancellation of the
Certificate of Limited Partnership as provided in the Delaware Act.

      SECTION 2.8 Title to Partnership Assets. Title to Partnership assets,
whether real, personal or mixed and whether tangible or intangible, shall be
deemed to be owned by the Partnership as an entity, and no Partner, individually
or collectively, shall have any ownership interest in such Partnership assets or
any portion thereof. Title to any or all of the Partnership assets may be held
in the name of the Partnership, the General Partner, one or more of its
Affiliates or one or more nominees, as the General Partner may determine. The
General Partner hereby declares and warrants that any Partnership assets for
which record title is held in the name of the General Partner or one or more of
its Affiliates or one or more nominees shall be held by the General Partner or
such Affiliate or nominee for the use and benefit of the Partnership in
accordance with the provisions of this Agreement; provided, however, that the
General Partner shall use reasonable efforts to cause record title to such
assets (other than those assets in respect of which the General Partner
determines that the expense and difficulty of conveyancing makes transfer of
record title to the Partnership impracticable) to be vested in the Partnership
as soon as reasonably practicable; provided, further, that, prior to the
withdrawal or removal of the General Partner or as soon thereafter as
practicable, the General Partner shall use reasonable efforts to effect the
transfer of record title to the Partnership and, prior to any such transfer,
will provide for the use of such assets in a manner satisfactory to the General
Partner. All Partnership assets shall be recorded as the property of the
Partnership in its books and records, irrespective of the name in which record
title to such Partnership assets is held.

                                  ARTICLE III.

                           Rights of Limited Partners

      SECTION 3.1 Limitation of Liability. The Limited Partners shall have no
liability under this Agreement except as expressly provided in this Agreement or
the Delaware Act.

      SECTION 3.2 Management of Business. No Limited Partner, in its capacity as
such, shall participate in the operation, management or control (within the
meaning of the Delaware Act) of the Partnership's business, transact any
business in the Partnership's name or have the power to sign documents for or
otherwise bind the Partnership. Any action taken by any Affiliate of the General
Partner or any officer, director, employee, manager, member, general partner,
agent or trustee of the General Partner or any of its Affiliates, or any
officer, director, employee, manager, member, general partner, agent or trustee
of a Group Member, in its capacity as such, shall not be deemed to be
participation in the control of the business of the Partnership by a limited
partner of the Partnership (within the meaning of Section 17-303(a) of the
Delaware Act) and shall not affect, impair or eliminate the limitations on the
liability of the Limited Partners under this Agreement.

      SECTION 3.3 Outside Activities of the Limited Partners. Subject to the
provisions of Section 7.5, which shall continue to be applicable to the Persons
referred to therein, regardless of whether such Persons shall also be Limited
Partners, any Limited Partner shall be entitled to and may have business
interests and engage in business activities in addition to those relating to the
Partnership, including business interests and activities in direct competition
with the Partnership Group. Neither the Partnership nor any of the other
Partners shall have any rights by virtue of this Agreement in any business
ventures of any Limited Partner.

      SECTION 3.4 Rights of Limited Partners.

      (a) In addition to other rights provided by this Agreement or by
applicable law, and except as limited by Section 3.4(b), each Limited Partner
shall have the right, for a purpose reasonably related to such Limited

                                      A-19
<PAGE>

Partner's interest as a Limited Partner in the Partnership, upon reasonable
written demand stating the purpose of such demand, and at such Limited Partner's
own expense:

            (i) to obtain true and full information regarding the status of the
      business and financial condition of the Partnership;

            (ii) promptly after its becoming available, to obtain a copy of the
      Partnership's federal, state and local income tax returns for each year;

            (iii) to obtain a current list of the name and last known business,
      residence or mailing address of each Partner;

            (iv) to obtain a copy of this Agreement and the Certificate of
      Limited Partnership and all amendments thereto, together with copies of
      the executed copies of all powers of attorney pursuant to which this
      Agreement, the Certificate of Limited Partnership and all amendments
      thereto have been executed;

            (v) to obtain true and full information regarding the amount of cash
      and a description and statement of the Net Agreed Value of any other
      Capital Contribution by each Partner and that each Partner has agreed to
      contribute in the future, and the date on which each became a Partner; and

            (vi) to obtain such other information regarding the affairs of the
      Partnership as is just and reasonable.

      (b) The General Partner may keep confidential from the Limited Partners,
for such period of time as the General Partner deems reasonable, (i) any
information that the General Partner reasonably believes to be in the nature of
trade secrets or (ii) other information the disclosure of which the General
Partner in good faith believes (A) is not in the best interests of the
Partnership Group, (B) could damage the Partnership Group or its business or (C)
that any Group Member is required by law or by agreement with any third party to
keep confidential (other than agreements with Affiliates of the Partnership the
primary purpose of which is to circumvent the obligations set forth in this
Section 3.4).

                                   ARTICLE IV.

                          Certificates; Record Holders;
                       Transfer of Partnership Interests;
                       Redemption of Partnership Interests

      SECTION 4.1 Certificates. Upon the Partnership's issuance of Common Units,
Subordinated Units or Class B Units to any Person, the Partnership shall issue,
upon the request of such Person, one or more Certificates in the name of such
Person evidencing the number of such Units being so issued. In addition, (a)
upon the General Partner's request, the Partnership shall issue to it one or
more Certificates in the name of the General Partner evidencing its General
Partner Interest and (b) upon the request of any Person owning Incentive
Distribution Rights or any other Partnership Securities other than Common Units,
Subordinated Units or Class B Units, the Partnership shall issue to such Person
one or more certificates evidencing such Incentive Distribution Rights or other
Partnership Securities other than Common Units, Subordinated Units or Class B
Units. Certificates shall be executed on behalf of the Partnership by the
Chairman of the Board, President or any Executive Vice President, Senior Vice
President or Vice President and the Secretary or any Assistant Secretary of the
General Partner. No Common Unit Certificate shall be valid for any purpose until
it has been countersigned by the Transfer Agent; provided, however, that if the
General Partner elects to issue Common Units in global form, the Common Unit
Certificates shall be valid upon receipt of a certificate from the Transfer
Agent certifying that the Common Units have been duly registered in accordance
with the directions of the Partnership. Subject to the requirements of Section
6.7(c) and Section 6.7(e), the Partners holding Certificates evidencing
Subordinated Units may exchange such Certificates for Certificates evidencing
Common Units on or after the date on which such Subordinated Units are converted
into Common Units pursuant to the terms of Section 5.7. Subject to the
requirements of Section 6.7(e), the Partners holding

                                      A-20
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Certificates evidencing Class B Units may exchange such Certificates for
Certificates evidencing Common Units on or after the period set forth in Section
5.11(f) pursuant to the terms of Section 5.11.

      SECTION 4.2 Mutilated, Destroyed, Lost or Stolen Certificates.

      (a) If any mutilated Certificate is surrendered to the Transfer Agent (for
Common Units) or the General Partner (for Partnership Securities other than
Common Units), the appropriate officers of the General Partner on behalf of the
Partnership shall execute, and the Transfer Agent (for Common Units) or the
General Partner (for Partnership Securities other than Common Units) shall
countersign and deliver in exchange therefor, a new Certificate evidencing the
same number and type of Partnership Securities as the Certificate so
surrendered.

      (b) The appropriate officers of the General Partner on behalf of the
Partnership shall execute and deliver, and the Transfer Agent (for Common Units)
shall countersign, a new Certificate in place of any Certificate previously
issued if the Record Holder of the Certificate:

            (i) makes proof by affidavit, in form and substance satisfactory to
      the General Partner, that a previously issued Certificate has been lost,
      destroyed or stolen;

            (ii) requests the issuance of a new Certificate before the General
      Partner has notice that the Certificate has been acquired by a purchaser
      for value in good faith and without notice of an adverse claim;

            (iii) if requested by the General Partner, delivers to the General
      Partner a bond, in form and substance satisfactory to the General Partner,
      with surety or sureties and with fixed or open penalty as the General
      Partner may direct to indemnify the Partnership, the Partners, the General
      Partner and the Transfer Agent against any claim that may be made on
      account of the alleged loss, destruction or theft of the Certificate; and

            (iv) satisfies any other reasonable requirements imposed by the
      General Partner.

      If a Limited Partner fails to notify the General Partner within a
reasonable period of time after he has notice of the loss, destruction or theft
of a Certificate, and a transfer of the Limited Partner Interests represented by
the Certificate is registered before the Partnership, the General Partner or the
Transfer Agent receives such notification, the Limited Partner shall be
precluded from making any claim against the Partnership, the General Partner or
the Transfer Agent for such transfer or for a new Certificate.

      (c) As a condition to the issuance of any new Certificate under this
Section 4.2, the General Partner may require the payment of a sum sufficient to
cover any tax or other governmental charge that may be imposed in relation
thereto and any other expenses (including the fees and expenses of the Transfer
Agent) reasonably connected therewith.

      SECTION 4.3 Record Holders. The Partnership shall be entitled to recognize
the Record Holder as the Partner with respect to any Partnership Interest and,
accordingly, shall not be bound to recognize any equitable or other claim to, or
interest in, such Partnership Interest on the part of any other Person,
regardless of whether the Partnership shall have actual or other notice thereof,
except as otherwise provided by law or any applicable rule, regulation,
guideline or requirement of any National Securities Exchange on which such
Partnership Interests are listed or admitted to trading. Without limiting the
foregoing, when a Person (such as a broker, dealer, bank, trust company or
clearing corporation or an agent of any of the foregoing) is acting as nominee,
agent or in some other representative capacity for another Person in acquiring
and/or holding Partnership Interests, as between the Partnership on the one
hand, and such other Persons on the other, such representative Person shall be
the Record Holder of such Partnership Interest.

      SECTION 4.4 Transfer Generally.

      (a) The term "transfer," when used in this Agreement with respect to a
Partnership Interest, shall be deemed to refer to a transaction (i) by which the
General Partner assigns its General Partner Interest to another Person or by
which a holder of Incentive Distribution Rights assigns its Incentive
Distribution Rights to another Person, and includes a sale, assignment, gift,
pledge, encumbrance, hypothecation, mortgage, exchange

                                      A-21
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or any other disposition by law or otherwise or (ii) by which the holder of a
Limited Partner Interest (other than an Incentive Distribution Right) assigns
such Limited Partner Interest to another Person who is or becomes a Limited
Partner, and includes a sale, assignment, gift, exchange or any other
disposition by law or otherwise, including any transfer upon foreclosure of any
pledge, encumbrance, hypothecation or mortgage.

      (b) No Partnership Interest shall be transferred, in whole or in part,
except in accordance with the terms and conditions set forth in this Article IV.
Any transfer or purported transfer of a Partnership Interest not made in
accordance with this Article IV shall be null and void.

      (c) Nothing contained in this Agreement shall be construed to prevent a
disposition by any stockholder, member, partner or other owner of the General
Partner of any or all of the shares of stock, membership interests, partnership
interests or other ownership interests in the General Partner.

      SECTION 4.5 Registration and Transfer of Limited Partner Interests.

      (a) The General Partner shall keep or cause to be kept on behalf of the
Partnership a register in which, subject to such reasonable regulations as it
may prescribe and subject to the provisions of Section 4.5(b), the Partnership
will provide for the registration and transfer of Limited Partner Interests. The
Transfer Agent is hereby appointed registrar and transfer agent for the purpose
of registering Common Units and transfers of such Common Units as herein
provided. The Partnership shall not recognize transfers of Certificates
evidencing Limited Partner Interests unless such transfers are effected in the
manner described in this Section 4.5. Upon surrender of a Certificate for
registration of transfer of any Limited Partner Interests evidenced by a
Certificate, and subject to the provisions of Section 4.5(b), the appropriate
officers of the General Partner on behalf of the Partnership shall execute and
deliver, and in the case of Common Units, the Transfer Agent shall countersign
and deliver, in the name of the holder or the designated transferee or
transferees, as required pursuant to the holder's instructions, one or more new
Certificates evidencing the same aggregate number and type of Limited Partner
Interests as was evidenced by the Certificate so surrendered.

      (b) Except as otherwise provided in Section 4.9, the General Partner shall
not recognize any transfer of Limited Partner Interests until the Certificates
evidencing such Limited Partner Interests are surrendered for registration of
transfer. No charge shall be imposed by the General Partner for such transfer;
provided, that as a condition to the issuance of any new Certificate under this
Section 4.5, the General Partner may require the payment of a sum sufficient to
cover any tax or other governmental charge that may be imposed with respect
thereto.

      (c) Subject to (i) the foregoing provisions of this Section 4.5, (ii)
Section 4.3, (iii) Section 4.8, (iv) with respect to any class or series of
Limited Partner Interests, the provisions of any statement of designations or an
amendment to this Agreement establishing such class or series, (v) any
contractual provisions binding on any Limited Partner and (vi) provisions of
applicable law including the Securities Act, Limited Partner Interests (other
than the Incentive Distribution Rights) shall be freely transferable.

      (d) The General Partner and its Affiliates and the EnCap Partnerships
shall have the right at any time to transfer their Subordinated Units, Class B
Units and Common Units (whether issued upon conversion of the Subordinated Units
or otherwise) to one or more Persons.

      SECTION 4.6 Transfer of the General Partner's General Partner Interest.

      (a) Subject to Section 4.6(c), prior to December 31, 2016, the General
Partner shall not transfer all or any part of its General Partner Interest to a
Person unless such transfer (i) has been approved by the prior written consent
or vote of the holders of at least a majority of the Outstanding Common Units
(excluding Common Units held by the General Partner and its Affiliates) or (ii)
is of all, but not less than all, of its General Partner Interest to (A) an
Affiliate of the General Partner (other than an individual) or (B) another
Person (other than an individual) in connection with the merger or consolidation
of the General Partner with or into such other Person or the transfer by the
General Partner of all or substantially all of its assets to such other Person.

      (b) Subject to Section 4.6(c), on or after December 31, 2016, the General
Partner may transfer all or any of its General Partner Interest without
Unitholder approval.

                                      A-22
<PAGE>

      (c) Notwithstanding anything herein to the contrary, no transfer by the
General Partner of all or any part of its General Partner Interest to another
Person shall be permitted unless (i) the transferee agrees to assume the rights
and duties of the General Partner under this Agreement and to be bound by the
provisions of this Agreement, (ii) the Partnership receives an Opinion of
Counsel that such transfer would not result in the loss of limited liability of
any Limited Partner under the Delaware Act or cause the Partnership to be
treated as an association taxable as a corporation or otherwise to be taxed as
an entity for federal income tax purposes (to the extent not already so treated
or taxed) and (iii) such transferee also agrees to purchase all (or the
appropriate portion thereof, if applicable) of the partnership or membership
interest of the General Partner as the general partner or managing member, if
any, of each other Group Member. In the case of a transfer pursuant to and in
compliance with this Section 4.6, the transferee or successor (as the case may
be) shall, subject to compliance with the terms of Section 10.3, be admitted to
the Partnership as the General Partner immediately prior to the transfer of the
General Partner Interest, and the business of the Partnership shall continue
without dissolution.

      SECTION 4.7 Transfer of Incentive Distribution Rights. Prior to December
31, 2016, a holder of Incentive Distribution Rights may transfer any or all of
the Incentive Distribution Rights held by such holder without any consent of the
Unitholders to (a) an Affiliate of such holder (other than an individual) or (b)
another Person (other than an individual) in connection with (i) the merger or
consolidation of such holder of Incentive Distribution Rights with or into such
other Person, (ii) the transfer by such holder of all or substantially all of
its assets to such other Person or (iii) the sale of all the ownership interests
in such holder. Any other transfer of the Incentive Distribution Rights prior to
December 31, 2016 shall require the prior approval of holders of at least a
majority of the Outstanding Common Units (excluding Common Units held by the
General Partner and its Affiliates). On or after December 31, 2016, the General
Partner or any other holder of Incentive Distribution Rights may transfer any or
all of its Incentive Distribution Rights without Unitholder approval.
Notwithstanding anything herein to the contrary, (i) the transfer of Class B
Units issued pursuant to Section 5.11, or the transfer of Common Units issued
upon conversion of the Class B Units, shall not be treated as a transfer of all
or any part of the Incentive Distribution Rights and (ii) no transfer of
Incentive Distribution Rights to another Person shall be permitted unless the
transferee agrees to be bound by the provisions of this Agreement.

      SECTION 4.8 Restrictions on Transfers.

      (a) Except as provided in Section 4.8(d), but notwithstanding the other
provisions of this Article IV, no transfer of any Partnership Interests shall be
made if such transfer would (i) violate the then applicable federal or state
securities laws or rules and regulations of the Commission, any state securities
commission or any other governmental authority with jurisdiction over such
transfer, (ii) terminate the existence or qualification of the Partnership under
the laws of the jurisdiction of its formation, or (iii) cause the Partnership to
be treated as an association taxable as a corporation or otherwise to be taxed
as an entity for federal income tax purposes (to the extent not already so
treated or taxed).

      (b) The General Partner may impose restrictions on the transfer of
Partnership Interests if it receives an Opinion of Counsel that such
restrictions are necessary to avoid a significant risk of the Partnership
becoming taxable as a corporation or otherwise becoming taxable as an entity for
federal income tax purposes. The General Partner may impose such restrictions by
amending this Agreement; provided, however, that any amendment that would result
in the delisting or suspension of trading of any class of Limited Partner
Interests on the principal National Securities Exchange on which such class of
Limited Partner Interests is then listed or admitted to trading must be
approved, prior to such amendment being effected, by the holders of at least a
majority of the Outstanding Limited Partner Interests of such class.

      (c) The transfer of a Subordinated Unit that has converted into a Common
Unit shall be subject to the restrictions imposed by Section 6.7(c).

      (d) The transfer of a Class B Unit that has converted into a Common Unit
shall be subject to the restrictions imposed by Section 6.7(e).

                                      A-23
<PAGE>

      (e) Nothing contained in this Article IV, or elsewhere in this Agreement,
shall preclude the settlement of any transactions involving Partnership
Interests entered into through the facilities of any National Securities
Exchange on which such Partnership Interests are listed or admitted to trading.

      (f) Each certificate evidencing Partnership Interests shall bear a
conspicuous legend in substantially the following form:

      THE HOLDER OF THIS SECURITY ACKNOWLEDGES FOR THE BENEFIT OF EV ENERGY
      PARTNERS, L.P. THAT THIS SECURITY MAY NOT BE SOLD, OFFERED, RESOLD,
      PLEDGED OR OTHERWISE TRANSFERRED IF SUCH TRANSFER WOULD (A) VIOLATE THE
       THEN APPLICABLE FEDERAL OR STATE SECURITIES LAWS OR RULES AND REGULATIONS
      OF THE SECURITIES AND EXCHANGE COMMISSION, ANY STATE SECURITIES COMMISSION
      OR ANY OTHER GOVERNMENTAL AUTHORITY WITH JURISDICTION OVER SUCH TRANSFER,
      (B) TERMINATE THE EXISTENCE OR QUALIFICATION OF EV ENERGY PARTNERS, L.P.
      UNDER THE LAWS OF THE STATE OF DELAWARE, OR (C) CAUSE EV ENERGY PARTNERS,
      L.P. TO BE TREATED AS AN ASSOCIATION TAXABLE AS A CORPORATION OR OTHERWISE
      TO BE TAXED AS AN ENTITY FOR FEDERAL INCOME TAX PURPOSES (TO THE EXTENT
      NOT ALREADY SO TREATED OR TAXED). EV ENERGY GP, L.P., THE GENERAL PARTNER
      OF EV ENERGY PARTNERS, L.P., MAY IMPOSE ADDITIONAL RESTRICTIONS ON THE
      TRANSFER OF THIS SECURITY IF IT RECEIVES AN OPINION OF COUNSEL THAT SUCH
      RESTRICTIONS ARE NECESSARY TO AVOID A SIGNIFICANT RISK OF EV ENERGY
      PARTNERS, L.P. BECOMING TAXABLE AS A CORPORATION OR OTHERWISE BECOMING
      TAXABLE AS AN ENTITY FOR FEDERAL INCOME TAX PURPOSES. THE RESTRICTIONS SET
      FORTH ABOVE SHALL NOT PRECLUDE THE SETTLEMENT OF ANY TRANSACTIONS
      INVOLVING THIS SECURITY ENTERED INTO THROUGH THE FACILITIES OF ANY
      NATIONAL SECURITIES EXCHANGE ON WHICH THIS SECURITY IS LISTED OR ADMITTED
      TO TRADING.

      SECTION 4.9 Citizenship Certificates; Non-citizen Assignees.

      (a) If any Group Member is or becomes subject to any federal, state or
local law or regulation that the General Partner determines would create a
substantial risk of cancellation or forfeiture of any property in which the
Group Member has an interest based on the nationality, citizenship or other
related status of a Limited Partner, the General Partner may request any Limited
Partner to furnish to the General Partner, within 30 days after receipt of such
request, an executed Citizenship Certification or such other information
concerning his nationality, citizenship or other related status (or, if the
Limited Partner is a nominee holding for the account of another Person, the
nationality, citizenship or other related status of such Person) as the General
Partner may request. If a Limited Partner fails to furnish to the General
Partner within the aforementioned 30-day period such Citizenship Certification
or other requested information or if upon receipt of such Citizenship
Certification or other requested information the General Partner determines that
a Limited Partner is not an Eligible Citizen, the Limited Partner Interests
owned by such Limited Partner shall be subject to redemption in accordance with
the provisions of Section 4.10. In addition, the General Partner may require
that the status of any such Limited Partner be changed to that of a Non-citizen
Assignee and, thereupon, the General Partner shall be substituted for such
Non-citizen Assignee as the Limited Partner in respect of the Non-citizen
Assignee's Limited Partner Interests and shall have all voting and consent
rights attributable to the Non-citizen Assignee's Limited Partner Interests.

      (b) The General Partner shall, in exercising voting rights in respect of
Limited Partner Interests held by it on behalf of Non-citizen Assignees,
distribute the votes in the same ratios as the votes of Partners (including the
General Partner) in respect of Limited Partner Interests other than those of
Non-citizen Assignees are cast, either for, against or abstaining as to the
matter.

      (c) Upon dissolution of the Partnership, a Non-citizen Assignee shall have
no right to receive a distribution in kind pursuant to Section 12.4 but shall be
entitled to the cash equivalent thereof, and the Partnership shall provide cash
in exchange for an assignment of the Non-citizen Assignee's share of any
distribution in kind. Such payment and assignment shall be treated for
Partnership purposes as a purchase by

                                      A-24
<PAGE>

the Partnership from the Non-citizen Assignee of his Limited Partner Interest
(representing his right to receive his share of such distribution in kind).

      (d) At any time after he can and does certify that he has become an
Eligible Citizen, a Non-citizen Assignee may, upon application to the General
Partner, request that with respect to any Limited Partner Interests of such
Non-citizen Assignee not redeemed pursuant to Section 4.10, such Non-citizen
Assignee be admitted as a Limited Partner, and upon approval of the General
Partner, such Non-citizen Assignee shall be admitted as a Limited Partner and
shall no longer constitute a Non-citizen Assignee and the General Partner shall
cease to be deemed to be the Limited Partner in respect of the Non-citizen
Assignee's Limited Partner Interests.

      SECTION 4.10 Redemption of Partnership Interests of Non-citizen Assignees.

      (a) If at any time a Limited Partner fails to furnish a Citizenship
Certification or other information requested within the 30-day period specified
in Section 4.9(a), or if upon receipt of such Citizenship Certification or other
information the General Partner determines, with the advice of counsel, that a
Limited Partner is not an Eligible Citizen, the Partnership may, unless the
Limited Partner establishes to the satisfaction of the General Partner that such
Limited Partner is an Eligible Citizen or has transferred his Partnership
Interests to a Person who is an Eligible Citizen and who furnishes a Citizenship
Certification to the General Partner prior to the date fixed for redemption as
provided below, redeem the Limited Partner Interest of such Limited Partner as
follows:

            (i) The General Partner shall, not later than the 30th day before
      the date fixed for redemption, give notice of redemption to the Limited
      Partner, at his last address designated on the records of the Partnership
      or the Transfer Agent, by registered or certified mail, postage prepaid.
      The notice shall be deemed to have been given when so mailed. The notice
      shall specify the Redeemable Interests, the date fixed for redemption, the
      place of payment, that payment of the redemption price will be made upon
      surrender of the Certificate evidencing the Redeemable Interests and that
      on and after the date fixed for redemption no further allocations or
      distributions to which the Limited Partner would otherwise be entitled in
      respect of the Redeemable Interests will accrue or be made.

            (ii) The aggregate redemption price for Redeemable Interests shall
      be an amount equal to the Current Market Price (the date of determination
      of which shall be the date fixed for redemption) of Limited Partner
      Interests of the class to be so redeemed multiplied by the number of
      Limited Partner Interests of each such class included among the Redeemable
      Interests. The redemption price shall be paid, as determined by the
      General Partner, in cash or by delivery of a promissory note of the
      Partnership in the principal amount of the redemption price, bearing
      interest at the rate of 5% annually and payable in three equal annual
      installments of principal together with accrued interest, commencing one
      year after the redemption date.

            (iii) Upon surrender by or on behalf of the Limited Partner, at the
      place specified in the notice of redemption, of the Certificate evidencing
      the Redeemable Interests, duly endorsed in blank or accompanied by an
      assignment duly executed in blank, the Limited Partner or his duly
      authorized representative shall be entitled to receive the payment
      therefor.

            (iv) After the redemption date, Redeemable Interests shall no longer
      constitute issued and Outstanding Limited Partner Interests.

      (b) The provisions of this Section 4.10 shall also be applicable to
Limited Partner Interests held by a Limited Partner as nominee of a Person
determined to be other than an Eligible Citizen.

      (c) Nothing in this Section 4.10 shall prevent the recipient of a notice
of redemption from transferring his Limited Partner Interest before the
redemption date if such transfer is otherwise permitted under this Agreement.
Upon receipt of notice of such a transfer, the General Partner shall withdraw
the notice of redemption, provided the transferee of such Limited Partner
Interest certifies to the satisfaction of the General Partner that he is an
Eligible Citizen. If the transferee fails to make such certification, such
redemption shall be effected from the transferee on the original redemption
date.

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<PAGE>

                                   ARTICLE V.

                             Capital Contributions and
                        Issuance of Partnership Interests

      SECTION 5.1 Organizational Contributions. In connection with the formation
of the Partnership under the Delaware Act, the General Partner made an initial
Capital Contribution to the Partnership in the amount of $10.00, for a 1%
General Partner Interest in the Partnership and has been admitted as the General
Partner of the Partnership, and the Organizational Limited Partner made an
initial Capital Contribution to the Partnership in the amount of $990.00 for a
99% Limited Partner Interest in the Partnership and has been admitted as a
Limited Partner of the Partnership. As of the Closing Date, the interest of the
Organizational Limited Partner shall be redeemed and the initial Capital
Contribution of the Organizational Limited Partner shall thereupon be refunded.
Ninety-nine percent of any interest or other profit that may have resulted from
the investment or other use of such initial Capital Contributions shall be
allocated and distributed to the Organizational Limited Partner, and the balance
thereof shall be allocated and distributed to the General Partner.

      SECTION 5.2 Contributions by the General Partner and its Affiliates and
the EnCap Partnerships.

      (a) On the Closing Date (i) the General Partner shall contribute to the
Partnership, as a Capital Contribution, $144,500 in cash, all of the limited
liability company membership interests in the general partner of the Properties
Partnership and a limited partnership interest in the Properties Partnership, in
exchange for (A) a 2% General Partner Interest, subject to all of the rights,
privileges and duties of the General Partner under this Agreement and (B) the
Incentive Distribution Rights, (ii) EVOC, EnerVest, EV Investors and the EnCap
Partnerships shall contribute to the Partnership, as a Capital Contribution, a
limited partner interest in the Properties Partnership, in exchange for an
aggregate of 251,745 Common Units, 1,401,200 Subordinated Units and the right to
receive a cash payment of $25.52 million and (iii) CGas shall contribute to the
Partnership, as a Capital Contribution, all of the limited partner interests in
EVCG, in exchange for 343,256 Common Units, 1,698,800 Subordinated Units and the
right to receive a cash payment of $34.81 million (a portion of which shall
reimburse CGas for certain capital expenditures made by CGas).

      (b) Upon the issuance of any additional Limited Partner Interests by the
Partnership (other than the Common Units issued in the Initial Offering, the
Common Units issued pursuant to the Over-Allotment Option, the Common Units and
Subordinated Units issued pursuant to Section 5.2(a), any Class B Units issued
pursuant to Section 5.11 and any Common Units issued upon conversion of
Subordinated Units or Class B Units), the General Partner may make additional
Capital Contributions in an amount equal to the product obtained by multiplying
(i) the quotient determined by dividing (A) the General Partner's Percentage
Interest by (B) 100 less the General Partner's Percentage Interest times (ii)
the amount contributed to the Partnership by the Limited Partners in exchange
for such additional Limited Partner Interests. Except as set forth in Article
XII, the General Partner shall not be obligated to make any additional Capital
Contributions to the Partnership.

      SECTION 5.3 Contributions by Initial Limited Partners.

      (a) On the Closing Date and pursuant to the Underwriting Agreement, each
Underwriter shall contribute to the Partnership cash in an amount equal to the
Issue Price per Initial Common Unit, multiplied by the number of Common Units
specified in the Underwriting Agreement to be purchased by such Underwriter at
the Closing Date. In exchange for such Capital Contributions by the
Underwriters, the Partnership shall issue Common Units to each Underwriter on
whose behalf such Capital Contribution is made in an amount equal to the
quotient obtained by dividing (i) the cash contribution to the Partnership by or
on behalf of such Underwriter by (ii) the Issue Price per Initial Common Unit.

      (b) Upon the exercise of the Over-Allotment Option, each Underwriter shall
contribute to the Partnership cash in an amount equal to the Issue Price per
Initial Common Unit, multiplied by the number of Common Units to be purchased by
such Underwriter at the Option Closing Date. In exchange for such Capital
Contributions by the Underwriters, the Partnership shall issue Common Units to
each Underwriter on whose behalf such Capital Contribution is made in an amount
equal to the quotient obtained by dividing (i) the cash

                                      A-26
<PAGE>

contributions to the Partnership by or on behalf of such Underwriter by (ii) the
Issue Price per Initial Common Unit.

      (c) No Limited Partner Interests will be issued or issuable as of or at
the Closing Date other than (i) the Common Units issuable pursuant to
subparagraph (a) hereof in aggregate number equal to 3,900,000, (ii) the "Option
Units" as such term is used in the Underwriting Agreement in an aggregate number
up to 585,000 issuable upon exercise of the Over-Allotment Option pursuant to
subparagraph (b) hereof, (iii) the 3,100,000 Subordinated Units issuable to
pursuant to Section 5.2 hereof, (iv) the 595,000 Common Units issuable pursuant
to Section 5.2, and (v) the Incentive Distribution Rights.

      SECTION 5.4 Interest and Withdrawal. No interest shall be paid by the
Partnership on Capital Contributions. No Partner or Assignee shall be entitled
to the withdrawal or return of its Capital Contribution, except to the extent,
if any, that distributions made pursuant to this Agreement or upon termination
of the Partnership may be considered as such by law and then only to the extent
provided for in this Agreement. Except to the extent expressly provided in this
Agreement, no Partner shall have priority over any other Partner or Assignee
either as to the return of Capital Contributions or as to profits, losses or
distributions. Any such return shall be a compromise to which all Partners agree
within the meaning of Section 17-502(b) of the Delaware Act.

      SECTION 5.5 Capital Accounts.

      (a) The Partnership shall maintain for each Partner (or a beneficial owner
of Partnership Interests held by a nominee in any case in which the nominee has
furnished the identity of such owner to the Partnership in accordance with
Section 6031(c) of the Code or any other method acceptable to the General
Partner) owning a Partnership Interest a separate Capital Account with respect
to such Partnership Interest in accordance with the rules of Treasury Regulation
Section 1.704-1(b)(2)(iv). Such Capital Account shall be increased by (i) the
amount of all Capital Contributions made to the Partnership with respect to such
Partnership Interest and (ii) all items of Partnership income and gain
(including Simulated Gain and income and gain exempt from tax) computed in
accordance with Section 5.5(b) and allocated with respect to such Partnership
Interest pursuant to Section 6.1, and decreased by (x) the amount of cash or Net
Agreed Value of all actual and deemed distributions of cash or property made
with respect to such Partnership Interest and (y) all items of Partnership
deduction and loss (including Simulated Depletion and Simulated Loss) computed
in accordance with Section 5.5(b) and allocated with respect to such Partnership
Interest pursuant to Section 6.1.

      (b) For purposes of computing the amount of any item of income, gain,
loss, deduction, Simulated Depletion, Simulated Gain or Simulated Loss which is
to be allocated pursuant to Article VI and is to be reflected in the Partners'
Capital Accounts, the determination, recognition and classification of any such
item shall be the same as its determination, recognition and classification for
federal income tax purposes (including any method of depreciation, cost recovery
or amortization used for that purpose), provided, that:

            (i) Solely for purposes of this Section 5.5, the Partnership shall
      be treated as owning directly its proportionate share (as determined by
      the General Partner based upon the provisions of the applicable Group
      Member Agreement or governing, organizational or similar documents) of all
      property owned by any other Group Member that is classified as a
      partnership for federal income tax purposes and (y) any other partnership,
      limited liability company, unincorporated business or other entity
      classified as a partnership for federal income tax purposes of which a
      Group Member is, directly or indirectly, a partner.

            (ii) All fees and other expenses incurred by the Partnership to
      promote the sale of (or to sell) a Partnership Interest that can be
      neither deducted nor amortized under Section 709 of the Code, if any,
      shall, for purposes of Capital Account maintenance, be treated as an item
      of deduction at the time such fees and other expenses are incurred and
      shall be allocated among the Partners pursuant to Section 6.1.

            (iii) Except as otherwise provided in Treasury Regulation Section
      1.704-1(b)(2)(iv)(m), the computation of all items of income, gain, loss,
      deduction, Simulated Depletion, Simulated Gain or Simulated Loss shall be
      made without regard to any election under Section 754 of the Code which
      may be made by the Partnership and, as to those items described in Section
      705(a)(1)(B) or 705(a)(2)(B) of the Code, without regard to the fact that
      such items are not includable in gross income or are neither

                                      A-27
<PAGE>

      currently deductible nor capitalized for federal income tax purposes. To
      the extent an adjustment to the adjusted tax basis of any Partnership
      asset pursuant to Section 734(b) or 743(b) of the Code is required,
      pursuant to Treasury Regulation Section 1.704-1(b)(2)(iv)(m), to be taken
      into account in determining Capital Accounts, the amount of such
      adjustment in the Capital Accounts shall be treated as an item of gain or
      loss.

            (iv) Any income, gain, loss, Simulated Gain or Simulated Loss
      attributable to the taxable disposition of any Partnership property shall
      be determined as if the adjusted basis of such property as of such date of
      disposition were equal in amount to the Partnership's Carrying Value with
      respect to such property as of such date.

            (v) In accordance with the requirements of Section 704(b) of the
      Code, any deductions for depreciation, cost recovery, amortization or
      Simulated Depletion attributable to any Contributed Property shall be
      determined as if the adjusted basis of such property on the date it was
      acquired by the Partnership were equal to the Agreed Value of such
      property. Upon an adjustment pursuant to Section 5.5(d) to the Carrying
      Value of any Partnership property subject to depreciation, cost recovery,
      amortization or Simulated Depletion, any further deductions for such
      depreciation, cost recovery, amortization or Simulated Depletion
      attributable to such property shall be determined (A) as if the adjusted
      basis of such property were equal to the Carrying Value of such property
       immediately following such adjustment and (B) using a rate of
      depreciation, cost recovery, amortization or Simulated Depletion derived
      from the same method and useful life (or, if applicable, the remaining
      useful life) as is applied for federal income tax purposes; provided,
      however, that, if the asset has a zero adjusted basis for federal income
      tax purposes, depreciation, cost recovery, amortization or Simulated
      Depletion deductions shall be determined using any method that the General
      Partner may adopt.

            (vi) If the Partnership's adjusted basis in a depreciable or cost
      recovery property is reduced for federal income tax purposes pursuant to
      Section 48(q)(1) or 48(q)(3) of the Code, the amount of such reduction
      shall, solely for purposes hereof, be deemed to be an additional
      depreciation or cost recovery deduction in the year such property is
      placed in service and shall be allocated among the Partners pursuant to
      Section 6.1. Any restoration of such basis pursuant to Section 48(q)(2) of
      the Code shall, to the extent possible, be allocated in the same manner to
      the Partners to whom such deemed deduction was allocated.

      (c) (i) A transferee of a Partnership Interest shall succeed to a pro rata
portion of the Capital Account of the transferor relating to the Partnership
Interest so transferred.

            (ii) Subject to Section 6.7(c), immediately prior to the transfer of
      a Subordinated Unit or of a Subordinated Unit that has converted into a
      Common Unit pursuant to Section 5.7 by a holder thereof (other than a
      transfer to an Affiliate unless the General Partner elects to have this
      Section 5.5(c)(ii) apply), the Capital Account maintained for such Person
      with respect to its Subordinated Units or converted Subordinated Units
      will (A) first, be allocated to the Subordinated Units or converted
      Subordinated Units to be transferred in an amount equal to the product of
      (x) the number of such Subordinated Units or converted Subordinated Units
      to be transferred and (y) the Per Unit Capital Amount for a Common Unit,
      and (B) second, any remaining balance in such Capital Account will be
      retained by the transferor, regardless of whether it has retained any
      Subordinated Units or converted Subordinated Units ("RETAINED CONVERTED
      SUBORDINATED UNITS"). Following any such allocation, the transferor's
      Capital Account, if any, maintained with respect to the retained
      Subordinated Units or Retained Converted Subordinated Units, if any, will
      have a balance equal to the amount allocated under clause (B) hereinabove,
      and the transferee's Capital Account established with respect to the
      transferred Subordinated Units or converted Subordinated Units will have a
      balance equal to the amount allocated under clause (A) hereinabove.

      (d) (i) In accordance with Treasury Regulation Section
1.704-1(b)(2)(iv)(f), on an issuance of additional Partnership Interests for
cash or Contributed Property, the issuance of Partnership Interests as
consideration for the provision of services or the conversion of the Incentive
Distribution Rights or the General Partner's Combined Interest, as the case may
be, to Class B Units or Common Units pursuant to Sections 5.11(a) or

                                      A-28
<PAGE>

11.3(b), the Capital Account of all Partners and the Carrying Value of each
Partnership property immediately prior to such issuance shall be adjusted upward
or downward to reflect any Unrealized Gain or Unrealized Loss attributable to
such Partnership property, as if such Unrealized Gain or Unrealized Loss had
been recognized on an actual sale of each such property immediately prior to
such issuance for an amount equal to its fair market value, and had been
allocated to the Partners at such time pursuant to Section 6.1(c) in the same
manner as any item of gain, loss, Simulated Gain or Simulated Loss actually
recognized during such period would have been allocated. In determining such
Unrealized Gain or Unrealized Loss, the aggregate cash amount and fair market
value of all Partnership assets (including cash or cash equivalents) immediately
prior to the issuance of additional Partnership Interests shall be determined by
the General Partner using such method of valuation as it may adopt; provided,
however, that the General Partner, in arriving at such valuation, will rely
largely upon a methodology for determining the Partnerhip's equity value that
takes into account in a consistent manner both the Current Market Price of the
Common Units and the formula provided in Section 5.11(a) (as if an IDR Reset
Election had been made at such time). The General Partner shall allocate such
aggregate value among the assets of the Partnership (in such manner as it
determines) to arrive at a fair market value for individual properties.

            (ii) In accordance with Treasury Regulation Section
      1.704-1(b)(2)(iv)(f), immediately prior to any actual or deemed
      distribution to a Partner of any Partnership property (other than a
      distribution of cash that is not in redemption or retirement of a
      Partnership Interest), the Capital Accounts of all Partners and the
      Carrying Value of each Partnership property shall be adjusted upward or
      downward to reflect any Unrealized Gain or Unrealized Loss attributable to
      such Partnership property, as if such Unrealized Gain or Unrealized Loss
      had been recognized on an actual sale of each such property immediately
      prior to such distribution for an amount equal to its fair market value,
      and had been allocated to the Partners, at such time, pursuant to Section
      6.1(c) in the same manner as any item of gain, loss, Simulated Gain or
      Simulated Loss actually recognized during such period would have been
      allocated. In determining such Unrealized Gain or Unrealized Loss the
      aggregate cash amount and fair market value of all Partnership assets
      (including cash or cash equivalents) immediately prior to a distribution
      shall (A) in the case of an actual distribution that is not made pursuant
      to Section 12.4 or in the case of a deemed distribution, be determined and
      allocated in the same manner as that provided in Section 5.5(d)(i) or (B)
      in the case of a liquidating distribution pursuant to Section 12.4, be
      determined and allocated by the Liquidator using such method of valuation
      as it may adopt.

      SECTION 5.6 Issuances of Additional Partnership Securities.

      (a) The Partnership may issue additional Partnership Securities and
options, rights, warrants and appreciation rights relating to the Partnership
Securities for any Partnership purpose at any time and from time to time to such
Persons for such consideration and on such terms and conditions as the General
Partner shall determine, all without the approval of any Limited Partners.

      (b) Each additional Partnership Security authorized to be issued by the
Partnership pursuant to Section 5.6(a) may be issued in one or more classes, or
one or more series of any such classes, with such designations, preferences,
rights, powers and duties (which may be senior to existing classes and series of
Partnership Securities), as shall be fixed by the General Partner, including (i)
the right to share in Partnership profits and losses or items thereof; (ii) the
right to share in Partnership distributions; (iii) the rights upon dissolution
and liquidation of the Partnership; (iv) whether, and the terms and conditions
upon which, the Partnership may redeem the Partnership Security; (v) whether
such Partnership Security is issued with the privilege of conversion or exchange
and, if so, the terms and conditions of such conversion or exchange; (vi) the
terms and conditions upon which each Partnership Security will be issued,
evidenced by certificates and assigned or transferred; (vii) the method for
determining the Percentage Interest as to such Partnership Security; and (viii)
the right, if any, of each such Partnership Security to vote on Partnership
matters, including matters relating to the relative rights, preferences and
privileges of such Partnership Security.

      (c) The General Partner shall take all actions that it determines to be
necessary or appropriate in connection with (i) each issuance of Partnership
Securities and options, rights, warrants and appreciation rights relating to
Partnership Securities pursuant to this Section 5.6, (ii) the conversion of the
General Partner Interest or any Incentive Distribution Rights into Units
pursuant to the terms of this Agreement, (iii) the

                                      A-29
<PAGE>

issuance of Class B Units pursuant to Section 5.11 and the conversion of Class B
Units into Common Units pursuant to the terms of this Agreement, (iv) the
issuance of Common Units upon the conversion of Subordinated Units pursuant to
Section 5.7, (v) reflecting admission of such additional Limited Partners in the
books and records of the Partnership as the Record Holder of such Limited
Partner Interest and (vi) all additional issuances of Partnership Securities.
The General Partner shall determine the relative rights, powers and duties of
the holders of the Units or other Partnership Se


 
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