BARGO ENERGY CO
SC 13D, 1999-05-24
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D

                   UNDER THE SECURITIES EXCHANGE ACT OF 1934*


                              BARGO ENERGY COMPANY
                                (NAME OF ISSUER)

                     COMMON STOCK, PAR VALUE $.01 PER SHARE
                         (TITLE OF CLASS OF SECURITIES)


                                  067587 10 5
                                 (CUSIP NUMBER)

                               D. MARTIN PHILLIPS
                            ENCAP INVESTMENTS L.L.C.
                           1100 LOUISIANA, SUITE 3150
                              HOUSTON, TEXAS 77002
                                 (713) 659-6100
                 (NAME, ADDRESS AND TELEPHONE NUMBER OF PERSON
               AUTHORIZED TO RECEIVE NOTICES AND COMMUNICATIONS)

                                  MAY 14, 1999
                      (DATE OF EVENT WHICH REQUIRES FILING
                               OF THIS STATEMENT)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Section 240.13d-1(e), 240.13d-1(f) or 204.13d-1(g), check
the following box. [ ]

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Section 240.13d-7(b) for
other parties to whom copies are to be sent.

*The remainder of the cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).


<PAGE>   2

CUSIP NO. 067587 10 5              SCHEDULE 13D

<TABLE>
<S>  <C>                                                                    <C>
(1)  Names of Reporting Persons I.R.S. Identification Nos. of Above Persons
     (entities only)

     EnCap Energy Capital Fund III, L.P.

(2)  Check the Appropriate Box if a Member of a Group (See Instructions)     (a) [ ]
                                                                             (b) [X]
(3)  SEC Use Only

(4)  Source of Funds (See Instructions)
     OO (SEE ITEM 3)

(5)  Check if Disclosure of Legal Proceedings is Required Pursuant to Items
     2(d) or 2(e)                                                                [ ]

(6)  Citizenship or Place of Organization EnCap Energy Capital Fund III, L.P.
     ("EnCap III") is a limited partnership organized under the laws of the
     state of Texas

                            (7)      Sole Voting Power
     Number of                       5,583,755(1)
     Shares Bene-
     ficially               (8)      Shared Voting Power
     Owned by                        0
     Each
     Reporting              (9)      Sole Dispositive Power
     Person With                     5,583,755(1)

                            (10)     Shared Dispositive Power
                                     0

(11) Aggregate Amount Beneficially Owned by Each Reporting Person
     5,583,755

(12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See
     Instructions)                                                               [ ]

(13) Percent of Class Represented by Amount in Row (11)
     6.1%

(14) Type of Reporting Person (See Instructions)
     PN
</TABLE>


(1) As exercised through its general partner, EnCap Investments L.L.C.



                                     Page 2

<PAGE>   3

CUSIP NO. 067587 10 5              SCHEDULE 13D

<TABLE>
<S>  <C>                                                                     <C>
(1)  Names of Reporting Persons I.R.S. Identification Nos. of Above Persons
     (entities only)

     ENCAP INVESTMENTS L.L.C.

(2)  Check the Appropriate Box if a Member of a Group (See Instructions)     (a) [ ]
                                                                             (b) [ ]
(3)  SEC Use Only

(4)  Source of Funds (See Instructions)
     OO (SEE ITEM 3)

(5)  Check if Disclosure of Legal Proceedings is Required Pursuant to Items
     2(d) or 2(e)                                                                [ ]

(6)  Citizenship or Place of Organization EnCap Investments L.L.C. ("EnCap
     Investments") is a limited liability company organized under the laws of
     the State of Delaware

                             (7)      Sole Voting Power
     Number of                        0
     Shares Bene-
     ficially                (8)      Shared Voting Power
     Owned by                         17,839,602(1)
     Each
     Reporting               (9)      Sole Dispositive Power
     Person With                      0

                             (10)     Shared Dispositive Power
                                      17,839,602(1)

(11) Aggregate Amount Beneficially Owned by Each Reporting Person
     17,839,602(2)

(12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See
     Instructions)                                                               [ ]

(13) Percent of Class Represented by Amount in Row (11)
     19.4%

(14) Type of Reporting Person (See Instructions)
     OO
</TABLE>

     (1) EnCap Investments may be deemed to have voting and dispositive power
with respect to the shares of Common Stock owned by EnCap III, EnCap III-B and
BOCP (defined herein), as well as certain other affiliates of EnCap
Investments. See Items 2, 5 and 6.

     (2) EnCap Investments disclaims any beneficial ownership of the shares
owned by EnCap III, EnCap III-B, BOCP and such other affiliates.


                                     Page 3
<PAGE>   4

CUSIP NO. 067587 10 5             SCHEDULE 13D

<TABLE>
<S>  <C>                                                                      <C>
(1)  Names of Reporting Persons I.R.S. Identification Nos. of Above Persons
     (entities only)

     ENCAP ENERGY CAPITAL FUND III-B, L.P.

(2)  Check the Appropriate Box if a Member of a Group (See Instructions)      (a) [ ]
                                                                              (b) [X]

(3)  SEC Use Only

(4)  Source of Funds (See Instructions)
     OO (SEE ITEM 3)

(5)  Check if Disclosure of Legal Proceedings is Required Pursuant to Items
     2(d) or 2(e)                                                                 [ ]

(6)  Citizenship or Place of Organization EnCap Energy Capital Fund III-B, L.P.
     ("EnCap III-B") is a limited partnership organized under the laws of the
     State of Texas

                                   (7)      Sole Voting Power
      Number of                             4,222,999 (1)
      Shares Bene-
      ficially                     (8)      Shared Voting Power
      Owned by                              0
      Each
      Reporting                    (9)      Sole Dispositive Power
      Person With                           4,222,999 (1)

                                   (10)     Shared Dispositive Power
                                            0

(11) Aggregate Amount Beneficially Owned by Each Reporting Person
     4,222,999

(12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See
     Instructions)                                                                [ ]

(13) Percent of Class Represented by Amount in Row (11)
     4.6%

(14) Type of Reporting Person (See Instructions)
     PN
</TABLE>


(1) As exercised through its general partner, EnCap Investments L.L.C.

                                     Page 4


<PAGE>   5

CUSIP NO. 067587 10 5             SCHEDULE 13D

<TABLE>
<S>  <C>                                                                      <C>
(1)  Names of Reporting Persons I.R.S. Identification Nos. of Above Persons
     (entities only)

     BOCP Energy Partners, L.P.

(2)  Check the Appropriate Box if a Member of a Group (See Instructions)      (a) [ ]
                                                                              (b) [X]
(3)  SEC Use Only

(4)  Source of Funds (See Instructions)
     OO (SEE ITEM 3)

(5)  Check if Disclosure of Legal Proceedings is Required Pursuant to Items
     2(d) or 2(e)                                                                 [ ]

(6)  Citizenship or Place of Organization BOCP Energy Partners, L.P. ("BOCP")
     is a limited partnership organized under the laws of the State of Texas

                                   (7)      Sole Voting Power
      Number of                             0
      Shares Bene-
      ficially                     (8)      Shared Voting Power
      Owned by                              1,366,277 (1)
      Each
      Reporting                    (9)      Sole Dispositive Power
      Person With                           0

                                   (10)     Shared Dispositive Power
                                            1,366,277 (1)

(11) Aggregate Amount Beneficially Owned by Each Reporting Person
     1,366,277

(12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See
     Instructions)                                                                [ ]

(13) Percent of Class Represented by Amount in Row (11)
     1.5%

(14) Type of Reporting Person (See Instructions)
     PN
</TABLE>

     (1) Voting and dispositive power is shared between BOCP and EnCap
Investments (defined herein), by virtue of an investment agreement. See Items 5
and 6.

                                     Page 5


<PAGE>   6

ITEM 1. SECURITY AND ISSUER.

      The class of equity securities to which this statement relates is common
stock, par value $.01 per share (the "Common Stock"), of Bargo Energy Company,
a Texas corporation and successor by merger to Future Petroleum Corporation, a
Utah corporation (the "Issuer"). The address of the principal executive offices
of the Issuer is 700 Louisiana, Suite 3700, Houston, Texas 77002.

ITEM 2. IDENTITY AND BACKGROUND.

(a) - (c), (f)

      The principal business of EnCap Energy Capital Fund III, L.P., a Texas
limited partnership ("EnCap III"), is engaging in oil and gas investments.
EnCap Investments L.L.C., a Delaware limited liability company ("EnCap
Investments"), is the general partner of EnCap III. The executive offices of
EnCap III are located at 1100 Louisiana Street, Suite 3150, Houston, Texas
77002.

      EnCap Energy Capital Fund III-B, L.P. ("EnCap III-B") is a Texas limited
partnership with its principal executive offices at 1100 Louisiana Street,
Suite 3150, Houston, Texas 77002. The principal business of EnCap III-B is
engaging in oil and gas investments. EnCap Investments is the general partner
of EnCap III-B.

      EnCap Investments is a Delaware limited liability company with its
principal executive offices at 1100 Louisiana Street, Suite 3150, Houston,
Texas 77002. EnCap Investments is the general partner of EnCap III and EnCap
III-B. The principal business of EnCap Investments is engaging in oil and gas
investments. Current information concerning the sole member and managing
directors of EnCap Investments is set forth on Schedule I hereto. The sole
member of EnCap Investments is El Paso Field Services Company, a Delaware
corporation ("El Paso Field Services").

      El Paso Field Services Company is a Delaware corporation with its
principal executive offices at 1001 Louisiana Street, Houston, Texas 77002. The
principal business of El Paso Field Services is natural gas gathering and
processing and intrastate gas transmission. Current information concerning the
controlling person and executive officers and directors of El Paso Field
Services is set forth on Schedule I hereto. The controlling person of El Paso
Field Services is El Paso Energy Corporation, a Delaware corporation ("El Paso
Energy").

      El Paso Energy is a Delaware corporation with its principal executive
offices located at the El Paso Energy Building, 1001 Louisiana Street, Houston,
Texas 77002. The principal business of El Paso Energy is serving as a holding
company for its various subsidiaries, which are engaged in energy and related
businesses. Current information concerning the executive officers and directors
of El Paso Energy is set forth on Schedule I hereto.

      BOCP Energy Partners, L.P. ("BOCP") is a Texas limited partnership. The
principal business of BOCP is engaging in oil and gas investments. The
principal executive offices of BOCP are located at 1100

                                    Page 6
<PAGE>   7

Louisiana Street, Suite 3150, Houston, Texas 77002. Banc One Capital Partners
VIII, Ltd. is the general partner of BOCP.

      Banc One Capital Partners VIII, Ltd. is an Ohio limited liability company,
with its principal executive offices at 150 East Gay Street, Columbus, Ohio
43215. The principal business of Banc One Capital Partners, VIII, Ltd. is
operating a closed-end investment fund ("Business") that acts as the general
partner of BOCP and to engage in other activities necessary or incidental to
such Business. The managing member of Banc One Capital Partners VIII, Ltd. is
BOCP Holdings Corporation. Current information concerning the managers of Banc
One Capital Partners VIII, Ltd. is set forth on Schedule I hereto.

      BOCP Holdings Corporation is an Ohio corporation with its principal
executive offices at 150 East Gay Street, Columbus, Ohio 43215. The principal
business of BOCP Holdings Corporation is investments. BOCP Holdings Corporation
is a wholly-owned subsidiary of Banc One Capital Holdings Corporation, an Ohio
corporation. Current information concerning the directors and executive
officers of BOCP Holdings Corporation is set forth on Schedule I hereto.

      Banc One Capital Holdings Corporation is an Ohio corporation with its
principal executive offices at 150 East Gay Street, Columbus, Ohio 43215 and is
a wholly-owned subsidiary of BANC ONE CORPORATION. The principal business of
Banc One Capital Holdings Corporation is investments. Current information
concerning the directors and executive officers of Banc One Holdings
Corporation is set forth on Schedule I hereto.

      BANC ONE CORPORATION is an Ohio corporation with its principal executive
offices at 150 E. Broad Street, Columbus, Ohio 43271. BANC ONE CORPORATION is a
bank holding company that provides a full range of consumer and commercial
banking and related financial services. Current information concerning the
directors and executive officers of BANC ONE CORPORATION is set forth on
Schedule I hereto.

(d) During the last five years, neither the parties listed in this Item 2 nor,
to the best knowledge of the reporting persons, any of the persons listed in
Schedule I, has been convicted in a criminal proceeding (excluding traffic
violations or similar misdemeanors).

(e) During the last five years, neither the parties listed in this Item 2 nor,
to the best knowledge of the reporting persons, any of the persons listed in
Schedule I was a party to a civil proceeding of a judicial or administrative
body of competent jurisdiction and as a result of such proceeding was or is
subject to a judgment, decree or final order enjoining future violations of, or
prohibiting activities subject to, federal or state securities laws or finding
any violation of such laws.

ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

PURCHASE OF CAPITAL STOCK

      On May 14, 1999, the Issuer closed a transaction pursuant to which it
issued and sold to Kayne Anderson Energy Fund, L.P. ("Kayne"), BancAmerica
Capital Investors SBIC I, L.P. ("BancAmerica"), Eos Partners, L.P., Eos
Partners SBIC, L.P., Eos Partners SBIC II, L.P. (collectively, "Eos"), Energy
Capital Investment Company PLC, EnCap III-B, BOCP, EnCap III


                                    Page 7
<PAGE>   8

(collectively, "EnCap") and SGC Partners II LLC ("SGC" and together with Kayne,
BancAmerica, Eos and EnCap, the "Investors") shares of a newly created class of
preferred stock. Pursuant to a Stock Purchase Agreement among the Issuer and
the Investors, five million shares of the Issuer's Cumulative Redeemable
Preferred Stock, Series B ("Preferred Stock") were issued in exchange for an
aggregate purchase price of $50 million paid by the Investors. As additional
consideration, the Issuer issued to the Investors an aggregate of 43,815,810
shares of its Common Stock, representing 40% of the outstanding Common Stock
(on a fully diluted basis). If the Issuer redeems all of the outstanding shares
of Preferred Stock prior to May 14, 2001, the Investors must sell back, for a
total of $100, to the Issuer 12.5% of the shares of Common Stock originally
issued to the Investors.

      Dividends on the Preferred Stock equal to 10% per annum are payable
quarterly. The dividend rate is subject to increase (but in no event to more
than 16%) or decrease (but in no event to less than 10%) based upon the
Issuer's ratio of certain assets to liabilities, which is calculated on January
1 and July 1 of each year or at such other time as requested by the Investors.
The Preferred Stock may be redeemed at any time by the Issuer and must be
redeemed upon the occurrence of certain events, including upon the fifth
anniversary of the issue date or upon a change of control. A change of control
is deemed to occur upon any merger, reorganization, purchase or sale of more
than 50% of the Issuer's voting securities, the sale of substantially all of
the assets of the Issuer or at any time Tim Goff ceases to serve as the
Issuer's Chief Executive Officer. The Issuer is prohibited from taking certain
actions, including authorizing, creating or issuing any shares of capital
stock, amending the articles of incorporation of the Issuer and authorizing a
merger or change of control, without the consent of the holders of a majority
of the outstanding shares of Preferred Stock.

SECOND AMENDED AND RESTATED SHAREHOLDERS' AGREEMENT

      In connection with the transaction, the Issuer, Bargo Energy Resources,
Ltd., TJG Investments, Inc., Bargo Energy Company, Tim J. Goff, Thomas Barrow,
James E. Sowell and Bargo Operating Company, Inc. (collectively, the "Bargo
Group"), B. Carl Price, Don Wm. Reynolds (Mr. Price and Mr. Reynolds are
referred to as the "Price Group"), EnCap Equity 1994 Limited Partnership and
the Investors entered into a Second Amended and Restated Shareholders'
Agreement (the "New Shareholders' Agreement"), thereby amending the Amended and
Restated Shareholders' Agreement formerly in place with the Issuer and certain
of its shareholders. Under the New Shareholders' Agreement, the holders of the
Preferred Stock have the right, for so long as the Preferred Stock is
outstanding and until the occurrence of certain other events, to appoint
designated nominees to the Issuer's Board of Directors. Accordingly, as part of
these transactions, B. Carl Price, Mary Elizabeth Vanderhider and Kimberley G.
Seekely have resigned from the Issuer's Board of Directors. Of the three
vacancies on the Board of Directors, one will be filled by a nominee to be
named by Kayne, one was filled by a nominee of BancAmerica and one was jointly
filled by a nominee of Eos and SGC. Brian D. Young was appointed to serve as
the Eos/SGC nominee and J. Travis Hain was appointed to serve as BancAmerica's
nominee. The EnCap entities have the right to appoint two nominees to the Board
of Directors and the members of the Bargo Group have the right to appoint two
nominee to the Board of Directors. The Price Group no longer has the right to
appoint nominees to the Board of Directors. The continuing members of Bargo's
Board are Tim J. Goff and Thomas D. Barrow (as the Bargo Group nominees) and
Gary R. Petersen and


                                    Page 8
<PAGE>   9

D. Martin Phillips (as the EnCap nominees). The New Shareholders' Agreement
also sets forth certain rights of first refusal and tag along rights among the
parties thereto.

      The provisions of the New Shareholders' Agreement relating to voting and
transfer of Common Stock may be deemed to form a group composed of the parties
to the New Shareholders' Agreement.

SECOND AMENDMENT TO REGISTRATION RIGHTS AGREEMENT

      The Issuer, the Investors and EnCap Equity 1994 Limited Partnership also
entered into a Second Amendment to Registration Rights Agreement dated May 14,
1999 providing for registration rights under an existing Registration Rights
Agreement among the Issuer and certain of the EnCap entities. The Registration
Rights Agreement, as amended, provides certain demand and piggyback
registration rights for the shares of Common Stock issued to the Investors.

AMENDMENT TO ISSUER'S BY-LAWS

      In connection with the transaction, the Issuer amended its Bylaws to
provide that for so long as each of (i) EOS and SGC (jointly), (ii) Kayne,
(iii) BancAmerica, (iv) EnCap and (v) the Bargo Group (each, a "Nominee Group")
is entitled to nominate one or more persons to the Board of Directors of the
Issuer as provided in the New Shareholders' Agreement, no act shall be deemed
to be an act of the Board of Directors or to be authorized and approved by the
Board of Directors without the approval of at least three directors that are
nominated by at least three separate Nominee Groups. In addition, Article VIII
of the Bylaws providing certain voting rights to the nominee of the Bargo
Group, was deleted.

ITEM 4. PURPOSE OF TRANSACTION.

      EnCap III, EnCap III-B and BOCP hold a substantial ownership position in
the Issuer in order to be able to influence the business and management of the
Issuer. Such reporting persons, through their nominees on the Board of
Directors, intend to actively participate in the business and management of the
Issuer. Under the New Shareholders' Agreement, the Investors collectively have
the ability to control the Issuer with respect to the election of directors.

      The reporting persons intend to monitor and evaluate their investment in
the Issuer in light of pertinent factors, including oil and gas prices, market
conditions, the Issuer's performance and prospects, the trading prices of the
Common Stock, conditions in the oil and gas industry and general economic
conditions. EnCap III, EnCap III-B and BOCP may make additional purchases of
Common Stock in the future through market transactions or otherwise, maintain
their current investment or dispose of some or all of the Common Stock.

      Except as set forth above, the reporting persons have no present plans or
proposals that relate to or that would result in any of the actions specified
in clauses (a) though (j) of Item 4 of Schedule 13D.


                                    Page 9
<PAGE>   10

ITEM 5. INTEREST IN SECURITIES OF THE ISSUER.

      (a) The following table describes the number of shares of Common Stock,
including shares of Common Stock issuable upon exercise or conversion of
derivative securities and the percent of outstanding Common Stock owned by the
reporting persons and the other parties to the New Shareholders' Agreement and
their officers, directors, partners and control persons ("Related Parties"),
other than those Related Parties that own no shares of Common Stock or
securities convertible into or exerciseable for shares of Common Stock. All
percentages are based on 48,357,784 shares of Common Stock issued and
outstanding on May 14, 1999, as represented by the Issuer in the Stock Purchase
Agreement dated May 14, 1999 among Bargo and the Investors, plus the 43,815,810
shares of Common Stock issued to the Investors on May 14, 1999.

                                    Page 10

<PAGE>   11

<TABLE>
<CAPTION>
                                        SHARES OUTSTANDING         DERIVATIVE SECURITIES                  TOTAL
                                   ----------------------------  --------------------------   ------------------------------
               NAME                    SOLE          SHARED          SOLE         SHARED         NUMBER            %(1)
- ---------------------------------- -------------  -------------  ------------  ------------   -------------   --------------

<S>                                <C>            <C>            <C>           <C>            <C>             <C>
Bargo Energy Company                    --            7,078,333       --            --            7,078,333            7.68%
Bargo Energy Resources, Ltd.            --            4,694,859       --         250,000(2)       4,944,859            5.35%
Bargo Operating Company, Inc.           --            4,954,859       --         250,000(2)       5,204,859            5.63%
Tim J. Goff                            8,406,667     13,288,192       --         250,000(2)      21,944,859           23.74%
TJG Investments, Inc.                   --            1,255,000       --            --            1,255,000            1.36%
Thomas D. Barrow                       8,666,667       --             --            --            8,666,667            9.40%
James E. Sowell                        8,666,666       --             --            --            8,666,666            9.40%
Energy Capital Investment
Company PLC                                    -      4,241,598       --            --            4,241,598            4.60%
EnCap Equity 1994 Limited
Partnership                            2,424,973       --             --            --            2,424,973            2.63%
EnCap Energy Capital Fund III,
L.P.                                   5,583,755       --             --            --            5,583,755            6.06%
EnCap Energy Capital Fund III-B,
L.P.                                   4,222,999       --             --            --            4,222,999            4.58%
BOCP Energy Partners, L.P.              --            1,366,277       --            --            1,366,277            1.48%
EnCap Investments, L.L.C.               --           17,839,602       --            --           17,839,602           19.35%
B. Carl Price                          1,126,869       --             --         613,131(3)       1,740,000            1.88%
Don Wm. Reynolds                         753,362       --             --            --              753,362            0.82%
Kayne                                  8,763,162       --             --            --            8,763,162            9.51%
BancAmerica                           13,144,743       --             --            --           13,144,743           14.26%
SGC Partners II LLC.                   4,381,581       --             --            --            4,381,581            4.75%
Eos Partners, L.P.                       328,619       --             --            --              328,619            0.36%
Eos Partners SBIC, L.P.                3,417,633       --             --            --            3,417,633            3.71%
Eos Partners SBIC II, L.P.               635,329       --             --            --              635,329            0.69%
</TABLE>
     --------------

     (1)  In accordance with SEC regulations under Section 13(d) of the Act,
          the percent shown in this column for each stockholder represents the
          number of shares of Common Stock owned by the stockholder plus the
          derivative securities (on an as converted basis) owned by such
          stockholder divided by the number of shares outstanding plus the
          number of derivative securities (on an as converted basis) owned by
          such stockholder.

     (2)  Represents warrants to purchase Common Stock.

     (3)  Includes 550,000 shares of Common Stock that may be acquired pursuant
          to employee stock options which may be exercised immediately. Also
          includes 63,131 shares of Common Stock, the maximum number of shares
          which Mr. Price has the right to acquire during the 60 days following
          May 14, 1999 under an employment agreement with Bargo. Under this
          agreement, Mr. Price may elect to receive all or a portion of his
          salary in shares of Common Stock at a price per share of $0.33 per
          share until December 31, 1999. From January 1, 2000 and until the
          employment agreement terminates, the purchase price per share is the
          average midpoint between the bid and asked price of the Common Stock
          on the OTC Bulletin Board for the last five days of the calendar year
          prior to the year the compensation is earned. The 63,131 shares
          included in the foregoing table represents the maximum number of


                                    Page 11
<PAGE>   12

          shares which Mr. Price could acquire during the 60 day period
          following May 14, 1999 if he converted all of his salary into shares
          of Common Stock.

          (b) BOCP. Pursuant to the Management Agreement (as defined in Item
          6), BOCP shares the power to vote or direct the vote and to dispose
          or direct the disposition of 1,366,277 shares of Common Stock with
          EnCap Investments. In addition, all shares of Common Stock owned by
          BOCP are subject to the voting and transfer provisions of the New
          Shareholders' Agreement.

               EnCap III. EnCap III has the sole power to vote or direct the
          vote and to dispose or direct the disposition of 5,583,755 shares of
          Common Stock. In addition, all shares of Common Stock owned by EnCap
          III are subject to the voting and transfer provisions of the New
          Shareholders' Agreement.

               EnCap III-B. EnCap III-B has the sole power to vote or direct
          the vote and to dispose or direct the disposition of 4,222,999 shares
          of Common Stock. In addition, all shares of Common Stock owned by
          EnCap III-B are subject to the voting and transfer provisions of the
          New Shareholders' Agreement.

               EnCap Investments. EnCap Investments may be deemed to have the
          power to vote and direct the vote or to dispose or direct the
          disposition of 17,839,602 shares of Common Stock owned by BOCP (by
          virtue of the Management Agreement, as defined in Item 6), EnCap III
          (as its general partner), EnCap III-B (as its general partner) and
          certain other affiliates of EnCap Investments. EnCap Investments
          disclaims beneficial ownership of any shares of Common Stock owned by
          EnCap III, EnCap III-B, BOCP or such other affiliates.

               El Paso Field Services and El Paso Energy. Each of El Paso Field
          Services and El Paso Energy may be deemed to have the power to vote
          and direct the vote or to dispose or direct the disposition of the
          shares of Common Stock owned or deemed to be owned by EnCap
          Investments (by virtue of being controlling persons of EnCap
          Investments).

               Banc One Capital Partners VIII, Ltd.. Banc One Capital Partners
          VIII, Ltd. may be deemed to have the power to vote and direct the
          vote or to dispose or direct the disposition of the 1,366,277 shares
          of Common Stock owned by BOCP (by virtue of being the general partner
          of BOCP).

               BOCP Holdings Corporation, Banc One Capital Holdings Corporation
          and BANC ONE CORPORATION. Each of BOCP Holdings Corporation, Banc One
          Capital Holdings Corporation and BANC ONE CORPORATION may be deemed
          to have the power to vote and direct the vote or to dispose or direct
          the disposition of the shares of Common Stock owned or deemed to be
          owned by Banc One Capital Partners VIII, Ltd. (by virtue of being
          controlling persons of Banc One Capital Partners VIII, Ltd.).

               Executive Officers and Directors. Except as otherwise described
          herein, to the knowledge of the reporting persons, no executive
          officer or director of the reporting persons or managing director of
          EnCap Investments or other person listed in Schedule I has the power
          to vote or direct the vote or dispose or direct the disposition of
          any shares of Common Stock.

          (c) Except as otherwise described herein or in any Exhibit filed
          herewith, to the


                                    Page 12
<PAGE>   13

          knowledge of the reporting persons, none of the persons named in
          response to paragraph (a) above has effected any transaction in
          shares of the Common Stock during the past 60 days.

          (d) Except as otherwise described herein, no person other than EnCap
          III, EnCap III-B and BOCP has the right to receive or the power to
          direct the receipt of dividends from, or the proceeds from the sale
          of, the shares of Common Stock deemed to be beneficially owned by
          them.

          (e) It is inapplicable for the purposes herein to state the date on
          which a party ceased to be the owner of more than five percent (5%)
          of the shares of Common Stock.

ITEM 6.   CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
          TO THE SECURITIES OF THE ISSUER.

               EnCap Investments is a party to that certain Management
          Agreement dated August 21, 1997 among EnCap Investments, BOCP and
          Banc One Capital Partners VIII, Ltd. (the "Management Agreement")
          whereby EnCap Investments acts as an investment advisor to BOCP.

               Except as described in this Schedule 13D, there are no
          contracts, arrangements, understandings or relationships (legal or
          otherwise) between any of the individuals or entities described in
          Item 2 or between such persons and any other person with respect to
          the shares of Common Stock deemed to be beneficially owned by the
          reporting persons.

ITEM 7.   MATERIAL TO BE FILED AS EXHIBITS.

          Exhibit 1    -   Joint Filing Agreement dated May 21, 1999 among
                           EnCap III, EnCap III-B, BOCP and EnCap Investments.*

          Exhibit 4.1  -   Registration Rights Agreement dated August 14, 1998
                           between Future Petroleum Corporation, Energy Capital
                           Investment Company PLC and EnCap Equity 1994
                           Limited Partnership.**

          Exhibit 4.2  -   Second Amendment to Registration Rights Agreement
                           dated May 14, 1999 by and among Bargo Energy
                           Company, a Texas corporation, Energy Capital
                           Investment Company PLC, an English investment
                           company, EnCap Equity 1994 Limited Partnership, a
                           Texas limited partnership, EnCap Energy Capital Fund
                           III-B, L.P., a Texas limited partnership, BOCP
                           Energy Partners, L.P., a Texas limited partnership,
                           EnCap Energy Capital Fund III, L.P., a Texas limited
                           partnership, Kayne Anderson Energy Fund, L.P., a
                           Delaware limited partnership, BancAmerica Capital
                           Investors SBIC I, L.P., a Delaware limited
                           partnership, Eos Partners, L.P., a Delaware limited
                           partnership, Eos Partners SBIC, L.P., a Delaware
                           limited partnership, Eos Partners SBIC II, L.P., a
                           Delaware limited partnership, and SGC Partners II
                           LLC, a Delaware limited liability company.*

          Exhibit 4.3  -   Second Amended and Restated Shareholders' Agreement
                           dated May 14, 1999 by and among Bargo Energy Company,
                           a Texas corporation, B. Carl Price, a Texas resident,
                           Don Wm. Reynolds, a Texas resident, Energy Capital
                           Investment Company PLC, an English investment
                           company, EnCap Equity 1994


                                    Page 13

<PAGE>   14
                           Limited Partnership, a Texas limited partnership,
                           Bargo Energy Resources, Ltd., a Texas limited
                           partnership, TJG Investments, Inc., a Texas
                           corporation, Bargo Energy Company, a Texas general
                           partnership, Tim J. Goff, Thomas Barrow, James E.
                           Sowell, Bargo Operating Company, Inc., a Texas
                           corporation, EnCap Energy Capital Fund III-B, L.P., a
                           Texas limited partnership, BOCP Energy Partners,
                           L.P., a Texas limited partnership, EnCap Energy
                           Capital Fund III, L.P., a Texas limited partnership,
                           Kayne Anderson Energy Fund, L.P., a Delaware limited
                           partnership, BancAmerica Capital Investors SBIC I,
                           L.P., a Delaware limited partnership, Eos Partners,
                           L.P., a Delaware limited partnership, Eos Partners
                           SBIC, L.P., a Delaware limited partnership, Eos
                           Partners SBIC II, L.P., a Delaware limited
                           partnership, and SGC Partners II LLC, a Delaware
                           limited liability company.*

         Exhibit 10.1  -   Stock Purchase Agreement dated May 14, 1999 by and
                           among Energy Capital Investment Company PLC, an
                           English investment company, EnCap Energy Capital
                           Fund III-B, L.P., a Texas limited partnership, BOCP
                           Energy Partners, L.P., a Texas limited partnership,
                           EnCap Energy Capital Fund III, L.P., a Texas limited
                           partnership, Kayne Anderson Energy Fund, L.P., a
                           Delaware limited partnership, BancAmerica Capital
                           Investors SBIC I, L.P., a limited partnership, Eos
                           Partners, L.P., a Delaware limited partnership, Eos
                           Partners SBIC, L.P., a Delaware limited partnership,
                           Eos Partners SBIC II, L.P., a Delaware limited
                           partnership, SGC Partners II LLC, a Delaware limited
                           liability company and Bargo Energy Company, a Texas
                           corporation.*

         Exhibit 10.2  -   Management Agreement dated August 21, 1997, by and
                           among Banc One Capital Partners VIII, Ltd., an Ohio
                           limited liability company, BOCP Energy Partners,
                           L.P., a Texas limited partnership, and EnCap
                           Investments L.L.C., a Texas limited liability
                           company.*

         *        Filed herewith.

         **       Incorporated by reference to Exhibit 4.9 to Schedule 13D/A
                  dated August 14, 1998, as filed regarding the common stock of
                  Future Petroleum Corporation owned by Energy Capital
                  Investment Company PLC, EnCap Equity 1994 Limited Partnership
                  and EnCap Investments L.L.C.



                                    Page 14

<PAGE>   15

                                   SCHEDULE I

                     DIRECTORS, MANAGERS, EXECUTIVE OFFICERS
                             OR CONTROLLING PERSONS

     1.  EnCap Investments. Set forth below are the name, business address and
present, principal occupation or employment of each managing director of EnCap
Investments. The business address of each managing director, unless otherwise
indicated below, is 1100 Louisiana Street, Suite 3150, Houston, Texas 77002.
Each member and managing director of EnCap is a United States citizen. To the
knowledge of the reporting persons, none of such individuals directly owns any
Common Stock.


<TABLE>
<CAPTION>

         Name             Present Principal Occupation or Employment
         ----             ------------------------------------------

<S>                       <C>

     Gary R. Peterson     Gary R. Petersen is a Managing Director of EnCap Investments.

     D. Martin Phillips   D. Martin Phillips is a Managing Director of EnCap Investments.

     David B. Miller      David B. Miller is a Managing Director of EnCap Investments.

     Robert L. Zorich     Robert L. Zorich is a Managing Director of EnCap Investments.

     D. Mark Leland       D. Mark Leland is a Managing Director of EnCap Investments.
</TABLE>


     2.  El Paso Field Services. The name, present principal occupation or
employment, and the name of any corporation or other organization in which such
employment is conducted, of each of the directors and executive officers of El
Paso Field Services is set forth below.

<TABLE>
<CAPTION>

Name and Citizenship                  Business Address                    Position/Principal Occupation
- --------------------                  ----------------                    -----------------------------

<S>                                   <C>                                 <C>
Executive Officers & Directors:
- --------------------------------------------------------------------------------------------------------------------
William A. Wise                       El Paso Energy Corporation          Chairman of the Board of El Paso Field
(United States Citizen)               1001 Louisiana Street               Services
                                      Houston, Texas 77002
Robert G. Phillips                    El Paso Energy Corporation          Director and President of El Paso Field
(United States Citizen)               1001 Louisiana Street               Services
                                      Houston, Texas 77002
H. Brent Austin                       El Paso Energy Corporation          Director, Executive Vice President and
(United States Citizen)               1001 Louisiana Street               Chief Financial Officer of El Paso Field
                                      Houston, Texas 77002                Services
- --------------------------------------------------------------------------------------------------------------------
Jeffrey I. Beason                     El Paso Energy Corporation          Vice President and Controller of El Paso
(United States Citizen)               1001 Louisiana Street               Field Services
                                      Houston, Texas 77002
</TABLE>



                                      I-1
<PAGE>   16

<TABLE>
<CAPTION>

<S>                                   <C>                                 <C>
C. Dana Rice                          El Paso Energy Corporation          Vice President and Treasurer of El Paso
(United States Citizen)               1001 Louisiana Street               Field Services
                                      Houston, Texas 77002
Robert Cavnar                         El Paso Energy Corporation          Senior Vice President and Chief
(United States Citizen)               1001 Louisiana Street               Operating Officer
                                      Houston, Texas 77002
D. Mark Leland                        El Paso Energy Corporation          Vice President
(United States Citizen)               1001 Louisiana Street
                                      Houston, Texas 77002
Gary R. Peterson                      See Part 1 above.                   Senior Vice President
D. Martin Phillips                    See Part 1 above.                   Senior Vice President
David B. Miller                       See Part 1 above.                   Senior Vice President
Robert L. Zorich                      See Part 1 above.                   Senior Vice President
- --------------------------------------------------------------------------------------------------------------------
</TABLE>


     3. El Paso Energy. The name, present principal occupation or employment,
and the name of any corporation or other organization in which such employment
is conducted, of each of the directors and executive officers of El Paso Energy
is set forth below.


<TABLE>
<CAPTION>

Name and Citizenship                  Business Address                    Position/Principal Occupation
- --------------------                  ----------------                    -----------------------------

<S>                                   <C>                                 <C>
Executive Officers & Directors:
William A. Wise                       El Paso Energy Corporation          Chairman of the Board,
(United States Citizen)               1001 Louisiana Street               President and Chief Executive Officer
                                      Houston, Texas 77002
H. Brent Austin                       El Paso Energy Corporation          Executive Vice President and Chief
(United States Citizen)               1001 Louisiana Street               Financial Officer
                                      Houston, Texas 77002
Richard Owen Baish                    El Paso Energy Corporation          President of El Paso Natural Gas Company
(United States Citizen)               1001 Louisiana Street
                                      Houston, Texas 77002
John D. Hushon                        El Paso Energy Corporation          President of El Paso Energy
(United States Citizen)               1001 Louisiana Street               International Company
                                      Houston, Texas 77002
Greg G. Jenkins                       El Paso Energy Corporation          President of El Paso Services Holding
(United States Citizen)               1001 Louisiana Street               Company
                                      Houston, Texas 77002
Robert G. Phillips                    El Paso Energy Corporation          President of El Paso Field Services
(United States Citizen)               1001 Louisiana Street               Company
                                      Houston, Texas 77002
John W. Somerhalder II                El Paso Energy Corporation          President of Tennessee Gas Pipeline
(United States Citizen)               1001 Louisiana Street               Company
                                      Houston, Texas 77002
</TABLE>



                                      I-2
<PAGE>   17

<TABLE>

<S>                                   <C>                                <C>
Joel Richards III                     El Paso Energy Corporation          Executive Vice President
(United States Citizen)               1001 Louisiana Street
                                      Houston, Texas 77002
Mark A. Searles                       El Paso Energy Corporation          Senior Vice President
(United States Citizen)               1001 Louisiana Street
                                      Houston, Texas 77002
Jeffrey I. Beason                     El Paso Energy Corporation          Vice President and Controller
(United States Citizen)               1001 Louisiana Street
                                      Houston, Texas 77002
C. Dana Rice                          El Paso Energy Corporation          Vice President and Treasurer
(United States Citizen)               1001 Louisiana Street
                                      Houston, Texas 77002
Britton White Jr.                     El Paso Energy Corporation          Executive Vice President and General
(United States Citizen)               1001 Louisiana Street               Counsel
                                      Houston, Texas 77002
Byron Allumbaugh                      Ralphs Grocery Company              Director of El Paso/Retired
(United States Citizen)               610 Newport Center Drive,           Former Chairman, Ralphs Grocery Company
                                      Suite 210
                                      Newport Beach, CA 92660
Juan Carlos Braniff                   Presidente Masaryk No. 8 6th Floor  Director of El Paso/Deputy CEO Insurance
(Mexican Citizen)                     Col. Bosques de                     & Pensions Sector Grupo Financiero
                                      Chapultepec                         Bancomer
                                      Mexico, D.F. 11588
Peter T. Flawn                        University of Texas                 Director of El Paso
(United States Citizen)               23rd and San Jacinto                President Emeritus, University of Texas
                                      Room GEO526                         at Austin
                                      Austin, Texas 78705
James F. Gibbons                      Stanford University                 Director of El Paso/Former Dean of
(United States Citizen)               Paul G. Allen Center for            Engineering, Stanford University
                                      Integrated Systems
                                      Room 201, Mail Stop 4075
                                      Stanford, CA 94305
Ben F. Love                           Chase Bank of Texas                 Director of El Paso/Investor Former
(United States Citizen)               600 Travis, 18th Floor              Chairman and CEO, Texas Commerce
                                      Houston, Texas 77002                Bancshares
Kenneth L. Smalley                    5 Queensview Court                  Director of El Paso/Retired
(United States Citizen)               Dallas, Texas 75225                 Former President of Phillips 66 Natural
                                                                          Gas Company
Malcolm Wallop                        Frontiers of Freedom                Director of El Paso
(United States Citizen)               Western Strategy Group              Chairman, Western Strategy Group and
                                      1100 Wilson Boulevard, Suite 1400   Frontiers of Freedom
                                      Arlington, VA 22209
</TABLE>



                                      I-3
<PAGE>   18


     4.  Banc One Capital Partners VIII, Ltd. Set forth below are the name,
business address and present principal occupation or employment of each manager
of Banc One Capital Partners VIII, Ltd. Each of the managers of Banc One Capital
Partners VIII, Ltd. is a United States citizen. To the knowledge of the
reporting persons, none of such individuals directly owns any Common Stock.

<TABLE>
<CAPTION>

     Name                 Present Principal Occupation or Employment
     ----                 ------------------------------------------

<S>                       <C>
     David R. Meuse       David R. Meuse is Chairman, President and Chief
                          Executive Officer of Banc One Capital Holdings
                          Corporation. His business address, and the address of
                          Banc One Capital Holdings Corporation, is 150 E. Gay
                          Street, 24th Floor, Columbus, Ohio 43215.

     James J. Henson      James J. Henson is Executive Vice President of Banc
                          One Capital Holdings Corporation and Executive Vice
                          President of BOCP Holdings Corporation. His business
                          address, and the address of Banc One Capital Holdings
                          Corporation, is 150 E. Gay Street, 24th Floor,
                          Columbus, Ohio 43215.

     Michael J. Endres    Michael J. Endres is Vice Chairman of Banc One Capital
                          Corporation and Chairman and President of BOCP
                          Holdings Corporation. His business address, and the
                          address of Banc One Capital Holdings Corporation, is
                          150 E. Gay Street, 24th Floor, Columbus, Ohio 43215.
</TABLE>


     5.  BOCP Holdings Corporation. Set forth below are the name, business
address and present principal occupation or employment of each director and
executive officer of BOCP Holdings Corporation. Directors are indicated by an
asterisk (*). Each of the directors and executive officers of BOCP Holdings
Corporation is a United States citizen. To the knowledge of the reporting
persons, none of such individuals directly owns any Common Stock.

<TABLE>
<CAPTION>

     Name                     Present Principal Occupation or Employment
     ----------------         --------------------------------------------------

<S>                           <C>
     Michael J. Endres*       See Part 4 above.

     William P. Boardman*     William P. Boardman is Senior Vice President of
                              BANC ONE CORPORATION. His business address, and
                              the address of BANC ONE CORPORATION, is 100 E.
                              Broad Street, Columbus, Ohio 43215.

     Ronald D. Brooks*        Ronald D. Brooks has been Chairman, President and
                              Chief Executive Officer of Banc One Capital
                              Corporation since 1993. His business address, and
                              the address of Banc One Capital Corporation, is
                              150 E. Gay Street, 22nd Floor, Columbus, Ohio
                              43215.
</TABLE>



                                      I-4
<PAGE>   19

<TABLE>

<S>                           <C>
     Frederick L. Cullen*     Frederick L. Cullen is President and Chief
                              Operating Officer of Banc One Ohio Corporation.
                              His business address, and the address of Banc One
                              Ohio Corporation, is 100 E. Broad Street,
                              Columbus, Ohio 43215, and its principal business
                              is owning and managing Bank One, N.A. and Bank One
                              Trust Company.

     G. Lee Griffin*          G. Lee Griffin is Chairman and Chief Executive
                              Officer of Banc One Louisiana Corporation. His
                              business address, and the address of Banc One
                              Louisiana Corporation, is Bank One Tower - Suite
                              2100, 451 Florida Street, Baton Rouge, Louisiana
                              70801. The principal business of Banc One
                              Louisiana Corporation is owning and managing Bank
                              One, Louisiana.

     Daniel J. Jessee*        Daniel J. Jessee has been Vice Chairman of Banc
                              One Capital Corporation since 1994. His business
                              address, and the address of Banc One Capital
                              Corporation, is 150 E. Gay Street, 22nd Floor,
                              Columbus, Ohio 43215. The principal business of
                              Banc One Capital Corporation is investments.

     David J. Kundert*        David J. Kundert has been Chairman and Chief
                              Executive Officer of Banc One Investment
                              Management Group, or its predecessor, since 1995.
                              His business address, and the address of Banc One
                              Investment Management Group, is 1111 Polaris
                              Parkway-B2, Columbus, Ohio 43240. The principal
                              business of Banc One Investment Management Group
                              is acting as a fiduciary branch, managing trusts
                              for business and individual clients and managing
                              client 401(k)s. Mr. Kundert is also President and
                              Chief Executive Officer of Banc One Investment
                              Advisors Corporation. The business address of Banc
                              One Investment Advisors Corporation is 1111
                              Polaris Parkway-B2, Columbus, Ohio 43240. The
                              principal business of Banc One Investment Advisors
                              Corporation is acting as an investment advisory
                              affiliate and managing BANC ONE CORPORATION's
                              401(k) plan and mutual funds.

     Robert F. B. Logan*      Robert F. B. Logan is currently retired. From 1995
                              to his retirement in 1996, Mr. Logan was President
                              and Chief Executive Officer of Bank One, Arizona.
                              His address, and the address of Bank One, Arizona,
                              is 241 North Central - 36th Floor, Phoenix,
                              Arizona 85004. The principal business of Bank One,
                              Arizona is banking. From 1992 to 1995, Mr. Logan
                              was retired.

     Donald L. McWhorter*     Donald L. McWhorter is currently retired. Prior to
                              his retirement in 1994, Mr. McWhorter was employed
                              with BANC ONE CORPORATION. His address, and the
                              address of BANC ONE CORPORATION, is 100 E. Broad
                              Street, Columbus, Ohio 43215. The principal
                              business of BANC ONE CORPORATION is banking.

     David R. Meuse*          See Part 4 above.
</TABLE>



                                      I-5
<PAGE>   20

<TABLE>

<S>                           <C>

     James V. Pickett*        James V. Pickett is Vice Chairman of Banc One
                              Capital Corporation. His business address, and the
                              address of Banc One Capital Corporation, is 150 E.
                              Gay Street, 22nd Floor, Columbus, Ohio 43215. The
                              principal business of Banc One Capital Corporation
                              is investments.

     William E. Roberts*      William E. Roberts is Vice Chairman of Banc One
                              Capital Corporation. His business address, and the
                              address of Banc One Capital Corporation, is 150 E.
                              Gay Street, 22nd Floor, Columbus, Ohio 43215. The
                              principal business of Banc One Capital Corporation
                              is investments.

     Ronald G. Steinhart*     Ronald G. Steinhart has been Chairman and Chief
                              Executive Officer of Banc One Commercial Banking
                              Group since 1996. His business address, and the
                              address of Banc One Commercial Banking Group, is
                              150 E. Gay Street, Columbus, Ohio 43215. The
                              principal business of Banc One Commercial Banking
                              Group is commercial banking.
</TABLE>


     6.  Banc One Capital Holdings Corporation. Set forth are the name, business
address and present principal occupation or employment of each director and
executive officer of Banc One Capital Holdings Corporation. Directors are
indicated by an asterisk (*). Each of the directors and executive officers of
Banc One Capital Holdings Corporation is a United States citizen. To the
knowledge of the reporting persons, none of such individuals directly owns any
Common Stock.

<TABLE>
<CAPTION>

<S>                       <C>
     John R. McCoy*       John B. McCoy is Chairman of BANC ONE CORPORATION.
                          His business address, and the address of BANC ONE
                          CORPORATION, is 100 E. Broad Street, Columbus, Ohio
                          43215. The principal business of BANC ONE CORPORATION
                          is banking.

     David R. Meuse*      See Part 4 above.

     James J. Henson*     See Part 4 above.

     Ronald D. Brooks*    See Part 5 above.

     David J. Kundert*    See Part 5 above.

     Michael J. Endres*   See Part 4 above.

     Brad L. Pospichel    Brad L. Pospichel has been Executive Vice President
                          and Treasurer of Banc One Capital Holdings Corporation
                          since 1993. His business address, and the address of
                          Banc One Capital Holdings Corporation, is 150 E. Gay
                          Street, 24th Floor, Columbus, Ohio 43215. The
                          principal business of Banc One Capital Holdings is
                          investments.
</TABLE>



                                      I-6
<PAGE>   21

     Carter K. McDowell   Carter K. McDowell has been Senior Vice President and
                          Director of Compliance of Banc One Capital Holdings
                          Corporation since September 1997. His business
                          address, and the address of Banc One Capital Holdings,
                          is 150 E. Gay Street, 24th Floor, Columbus, Ohio
                          43215. The principal business of Banc One Capital
                          Holdings is investments.

     7.  BANC ONE CORPORATION. Set forth below are the name, business address
and present principal occupation or employment of each director and executive
officer of BANC ONE CORPORATION. Directors are indicated by an asterisk (*).
Each of the directors and executive officers of BANC ONE CORPORATION is a United
States citizen. To the knowledge of the reporting persons, none of such
individuals directly owns any Common Stock.


<TABLE>
<CAPTION>

<S>                           <C>
     Bennett Dorrance*        Bennett Dorrance is an investor and Chairman and
                              Managing Director of DMB Associates. His business
                              address, and the address of DMB Associates, is 410
                              North 44th Street, Phoenix, Arizona 85008. The
                              principal business of DMB Associates is real
                              estate investment and development. Mr. Dorrance
                              also serves as Vice Chairman of Campbell Soup
                              Company, Inc. and is a director of UDC Homes, Inc.
                              The address of Campbell Soup Company, Inc. is
                              Campbell Place, Camden, New Jersey 08103-1799, and
                              its principal business is the manufacturing and
                              marketing of convenience food products. The
                              address of UDC Homes, Inc. is 6710 North
                              Scottsdale Road, Scottsdale, Arizona 85253, and
                              its principal business is home construction.

     Charles E. Exley, Jr.*   Charles E. Exley, Jr. is a Corporate Director of
                              BANC ONE CORPORATION. His business address, and
                              the address of BANC ONE CORPORATION, is 100 E.
                              Broad Street, Columbus, Ohio 43271. The principal
                              business of BANC ONE CORPORATION is banking.

     E. Gordon Gee*           E. Gordon Gee is President of The Ohio State
                              University. His business address, and the address
                              of The Ohio State University, is Columbus, Ohio
                              43210. In addition, Dr. Gee is a director of
                              Abercrombie & Fitch, Inc., ASACO, Inc., Columbia
                              Gas of Ohio, Glimcher Realty Trust, Intimate
                              Brands, Inc. and The Limited, Inc. The address of
                              Abercrombie & Fitch, Inc. is Four Limited Parkway
                              East, P.O. Box 182168 Reynoldsburg, Ohio 43218,
                              and its principal business is the purchase,
                              distribution and sale of men's and women' casual
                              apparel. The address of ASARCO, Inc. is 180 Maiden
                              Lane, New York, New York 10038, and its principal
                              business is the production of nonferrous metals,
                              specialty chemicals and aggregates. The address of
                              Columbia Gas of Ohio is 200 Civic Center Dove
                              South, Columbus, Ohio 43215 and its principal
                              business is gas operations. The address of
                              Glimcher Realty Trust is 20 South Third Street,
                              Columbus, Ohio 43215, and its principal business
                              is owning, leasing, acquiring, developing and
                              operating enclosed regional malls, community
                              shopping center properties and single tenant
                              retail properties. The address of Intimate Brands,
                              Inc. is Three Limited Parkway, P.O. Box 16000,
                              Columbus, Ohio 43216, and its principal business
                              is the purchase, distribution and sale of
                              lingerie, personal care products
</TABLE>




                                      I-7
<PAGE>   22

<TABLE>

<S>                           <C>
                              and women's apparel. The address of The Limited,
                              Inc. is Three Limited Parkway, P.O. Box 16000,
                              Columbus, Ohio 43216, and its principal business
                              is the purchase, distribution and sale of women's
                              apparel, lingerie, men's apparel, personal care
                              products, children's apparel and a wide variety of
                              sporting goods.

     John R. Hall*            John R. Hall has been retired since 1996. From
                              1992 to 1996, Mr. Hall was Chairman and Chief
                              Executive Officer of Ashland, Inc. His business
                              address, and the address of Ashland, Inc., is 1000
                              Ashland Drive, Russell, Kentucky 41169. The
                              principal business of Ashland, Inc. is oil
                              refining and the manufacturing and distribution of
                              chemicals. Mr. Hall also serves as a director of
                              Reynolds Metals Company, Humana Inc., CSX
                              Corporation and UCAR International, Inc. The
                              address of Reynolds Metals Company is 6601 W.
                              Broad Street, Richmond, Virginia 23261, and its
                              principal business is the manufacturing of
                              aluminum. The address of Humana Inc. is 500 West
                              Main Street, Louisville, Kentucky 40202, and its
                              principal business is managed health care
                              products. The address of CSX Corporation is 9901
                              East Cary Street, Richmond, Virginia 23219-4031,
                              and its principal business is rail freight
                              transportation and distribution services. The
                              address of UCAR International is 39 Old Ridgebury
                              Road, Danbury, Connecticut 06817-00001, and its
                              principal business is the manufacture of graphite
                              and carbon electrodes.

     Laban P. Jackson, Jr.*   Laban P. Jackson, Jr. is Chairman and Chief
                              Executive Officer of Clear Creek Properties, Inc.
                              His business address, and the address of Clear
                              Creek Properties, Inc., is 101 Prosperous Place,
                              Lexington, Kentucky 40509. The principal business
                              of Clear Creek Properties, Inc. is real estate
                              development.

     John W. Kessler*         John W. Kessler is Chairman of The New Albany
                              Company. The principal business of The New Albany
                              Company is real estate development. In addition,
                              Mr. Kessler has been Chairman of Marsh & McLennan
                              Real Estate Advisors, Inc., a real estate
                              development company since 1980, and Chairman of
                              John W. Kessler Company, a real estate development
                              company, since 1975.

     Richard J. Lehmann*      Richard J. Lehmann has been President of BANC ONE
                              CORPORATION since 1995 and Chief Operating Officer
                              of BANC ONE CORPORATION since 1996. His business
                              address, and the address of BANC ONE CORPORATION,
                              is 100 E. Broad Street, Columbus, Ohio 43271.

     John B. McCoy*           See Part 6 above.

     John G. McCoy*           John G. McCoy is Chairman of the BANC ONE
                              CORPORATION Executive Committee. His business
                              address, and the address of BANC ONE
</TABLE>



                                      I-8
<PAGE>   23

<TABLE>

<S>                           <C>
                              CORPORATION, is 100 E. Broad Street, Columbus,
                              Ohio 43271. The principal business of BANC ONE
                              CORPORATION is banking. Thekla R. Shackelford*
                              Thelka R. Shackelford is an education consultant.
                              In addition, Ms. Shackelford is a director of
                              Wendy's International, Inc. and Fiserv Inc. The
                              address of Wendy's International, Inc. is P.O. Box
                              256, 4288 West Dublin-Granville Road, Dublin, Ohio
                              43017-0256, and its principal business is quick
                              service restaurants. The address of Fiserv Inc. is
                              255 Fiserv Drive, Brookfield, Wisconsin 53045, and
                              its principal business is computer technology and
                              related products.

     Frederick P. Stratton,   Frederick P. Stratton, Jr. is Chairman and Chief
     Jr. *                    Executive Officer of Briggs & Stratton
                              Corporation. His business address, and the address
                              of Briggs & Stratton Corporation, is 12301 West
                              Wirth Street, Wauwatosa, Wisconsin 53222. The
                              principal business of Briggs & Stratton
                              Corporation is the manufacture of air cooled
                              gasoline engines for outdoor power equipment. Mr.
                              Stratton is also a director of Midwest Express
                              Holdings, Inc., Weyco Group, Inc., Wisconsin
                              Electric Power Company and Wisconsin Energy
                              Corporation. The address of Midwest Express
                              Holdings, Inc. is 6744 South Howell Avenue, Oak
                              Creek, Wisconsin 53154, and its principal business
                              is the operation of a single-class, premium
                              service passenger jet airline. The address of
                              Weyco Group, Inc. is 234 E. Reservoir Avenue, P.O.
                              Box 1188, Milwaukee, Wisconsin 53201, and its
                              principal business is the manufacture, purchase
                              and distribution of men's footwear. The address of
                              Wisconsin Electric Power Company is 231 West
                              Michigan Street, P.O. Box 2045, Milwaukee,
                              Wisconsin 53201, and its principal business is
                              electric, gas and steam utilities. The address of
                              Wisconsin Energy Corporation is 231 West Michigan
                              Street, P.O. Box 2949, Milwaukee, Wisconsin 53201,
                              and its principal business is electric, gas and
                              steam utilities.

     Robert D. Walter*        Robert D. Walker is Chairman and Chief Executive
                              Officer of Cardinal Health, Inc. His business
                              address, and the address of Cardinal Health, Inc.,
                              is 5555 Glendon Court, Dublin, Ohio 43016. The
                              principal business of Cardinal Health, Inc. is the
                              wholesale distribution of pharmaceuticals and
                              related health care products. Mr. Walter is also a
                              director of Karrington Health, Inc. and
                              Westinghouse Electric Corporation. The address of
                              Karrington Health, Inc. is 919 Old Henderson Road,
                              Columbus, Ohio 43220 and its principal business is
                              developing, owing and operating assisted living
                              residences. The address of Westinghouse Electric
                              Corporation is Westinghouse Building, 11 Stanwix
                              Street, Pittsburgh, Pennsylvania 15222-1384, and
                              it is a global company operating in the fields of
                              entertainment, technology and industry.

     John C. Tolleson*        John C. Tolleson was formerly Chairman and Chief
                              Executive Officer of First USA, Inc. His business
                              address, and the address of First USA, Inc., is
                              1601 Elm Street, 47th Floor, Dallas, Texas 75201.
                              The principal business of First USA, Inc. is
                              issuing credit cards and providing other
                              credit-related services. In addition, Mr. Tolleson
                              was Chairman and Chief Executive Officer of First
                              USA Financial, Inc. The principal business of
                              First USA Financial, Inc. is conducting the
                              operations of First USA, Inc. Mr. Tolleson was
                              also a director of First USA Bank and First USA
                              Federal Savings Bank. The principal business of
</TABLE>



                                      I-9
<PAGE>   24

<TABLE>
<CAPTION>

<S>                           <C>
                              First USA Bank is issuing credit cards. The
                              principal business of First USA Federal Savings
                              Bank is providing financial services to card
                              holders. Mr. Tolleson is also a chairman of First
                              USA Paymentech, which is a payment processor. The
                              address of First USA Financial, Inc., First USA
                              Bank, First USA Federal Savings Bank and First USA
                              Paymentech is 1601 Elm Street, 47th Floor, Dallas,
                              Texas 75201.

     John F. Havens*          John F. Havens is an honorary director of BANK ONE
                              CORPORATION. He is currently retired. Prior to his
                              retirement, he was chairman of BANC ONE
                              CORPORATION. The address of BANC ONE CORPORATION
                              is 100 E. Broad Street, Columbus, Ohio 45271, and
                              its principal business is banking.

     Steven A. Bennett        Steven A. Bennett is Senior Vice President and
                              General Counsel of BANC ONE CORPORATION. His
                              business address, and the address of BANC ONE
                              CORPORATION, is 100 E. Broad Street, Columbus,
                              Ohio 43271. The principal business of BANC ONE
                              CORPORATION is banking.

     William P. Boardman      See Part 5 above.

     Bobby L. Doxey           Bobby L. Doxey has been Senior Vice President and
                              Controller of BANC ONE CORPORATION since May 1996.
                              His business address, and the address of BANC ONE
                              CORPORATION, is 100 E. Broad Street, Columbus,
                              Ohio 43271. The principal business of BANC ONE
                              CORPORATION is banking.

     Roman J. Gerber          Roman J. Gerber is Executive Vice President of
                              BANC ONE CORPORATION. His business address, and
                              the address of BANC ONE CORPORATION, is 100 E.
                              Broad Street, Columbus, Ohio 43271. The principal
                              business of BANC ONE CORPORATION is banking.

     William C. Leiter        William C. Leiter is Senior Vice President of BANC
                              ONE CORPORATION. His business address, and the
                              address of BANC ONE CORPORATION, is 100 E. Broad
                              Street, Columbus, Ohio 43271. The principal
                              business of BANC ONE CORPORATION is banking.

     Richard D. Lodge         Richard D. Lodge is Senior Vice President of BANC
                              ONE CORPORATION. His business address, and the
                              address of BANC ONE CORPORATION, is 100 E. Broad
                              Street, Columbus, Ohio 43271. The principal
                              business of BANC ONE CORPORATION is banking.

     Michael J. McMennamin    Michael J. McMennamin is Executive Vice President
                              and Chief Financial Officer of BANC ONE
                              CORPORATION. His business address, and the address
                              of BANC ONE CORPORATION, is 100 E. Broad Street,
                              Columbus, Ohio 43271. The principal business of
                              BANC ONE CORPORATION is banking.
</TABLE>



                                      I-10

<PAGE>   25

                                   SIGNATURES

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Date: May 21, 1999                  ENCAP ENERGY CAPITAL FUND III, L.P.
                                    By: EnCap Investments L.L.C., General
                                        Partner

                                        By: /s/ D. Martin Phillips
                                            ----------------------------------
                                            D. Martin Phillips
                                            Managing Director


Date: May 21, 1999                  ENCAP ENERGY CAPITAL FUND III-B, L.P.
                                    By: EnCap Investments L.L.C., General
                                        Partner

                                        By: /s/ D. Martin Phillips
                                            ----------------------------------
                                            D. Martin Phillips
                                            Managing Director


Date: May 21, 1999                   BOCP ENERGY PARTNERS, L.P.
                                     By: EnCap Investments L.L.C., Manager

                                        By: /s/ D. Martin Phillips
                                            ----------------------------------
                                            D. Martin Phillips
                                            Managing Director


Date: May 21, 1999                   ENCAP INVESTMENTS L.L.C.

                                        By: /s/   D. Martin Phillips
                                            ----------------------------------
                                            D. Martin Phillips
                                            Managing Director


                                    Page 15
<PAGE>   26

                               INDEX TO EXHIBITS

<TABLE>
<CAPTION>
Exhibit
  No.                         Description
- -------                       -----------
<S>           <C>
   1     -    Joint Filing Agreement dated May 21, 1999 among EnCap III,
              EnCap III-B, BOCP and EnCap Investments.*

   4.1   -    Registration Rights Agreement dated August 14, 1998 between
              Future Petroleum Corporation, Energy Capital Investment Company
              PLC and EnCap Equity 1994 Limited Partnership.**

   4.2   -    Second Amendment to Registration Rights Agreement dated May 14,
              1999 by and among Bargo Energy Company, a Texas corporation,
              Energy Capital Investment Company PLC, an English investment
              company, EnCap Equity 1994 Limited Partnership, a Texas limited
              partnership, EnCap Energy Capital Fund III-B, L.P., a Texas
              limited partnership, BOCP Energy Partners, L.P., a Texas limited
              partnership, EnCap Energy Capital Fund III, L.P., a Texas limited
              partnership, Kayne Anderson Energy Fund, L.P., a Delaware limited
              partnership, BancAmerica Capital Investors SBIC I, L.P., a
              Delaware limited partnership, Eos Partners, L.P., a Delaware
              limited partnership, Eos Partners SBIC, L.P., a Delaware limited
              partnership, Eos Partners SBIC II, L.P., a Delaware limited
              partnership, and SGC Partners II LLC, a Delaware limited
              liability company.*

   4.3   -    Second Amended and Restated Shareholders' Agreement dated May
              14, 1999 by and among Bargo Energy Company, a Texas corporation,
              B. Carl Price, a Texas resident, Don Wm. Reynolds, a Texas
              resident, Energy Capital Investment Company PLC, an English
              investment company, EnCap Equity 1994 Limited Partnership, a
              Texas limited partnership, Bargo Energy Resources, Ltd., a Texas
              limited partnership, TJG Investments, Inc., a Texas corporation,
              Bargo Energy Company, a Texas general partnership, Tim J. Goff,
              Thomas Barrow, James E. Sowell, Bargo Operating Company, Inc., a
              Texas corporation, EnCap Energy Capital Fund III-B, L.P., a Texas
              limited partnership, BOCP Energy Partners, L.P., a Texas limited
              partnership, EnCap Energy Capital Fund III, L.P., a Texas limited
              partnership, Kayne Anderson Energy Fund, L.P., a Delaware limited
              partnership, BancAmerica Capital Investors SBIC I, L.P., a
              Delaware limited partnership, Eos Partners, L.P., a Delaware
              limited partnership, Eos Partners SBIC, L.P., a Delaware limited
              partnership, Eos Partners SBIC II, L.P., a Delaware limited
              partnership, and SGC Partners II LLC, a Delaware limited
              liability company.*

   10.1  -    Stock Purchase Agreement dated May 14, 1999 by and among Energy
              Capital Investment Company PLC, an English investment company,
              EnCap Energy Capital Fund III-B, L.P., a Texas limited
              partnership, BOCP Energy Partners, L.P., a Texas limited
              partnership, EnCap Energy Capital Fund III, L.P., a Texas limited
              partnership, Kayne Anderson Energy Fund, L.P., a Delaware limited
              partnership, BancAmerica Capital Investors SBIC I, L.P., a
              limited partnership, Eos Partners, L.P., a Delaware limited
              partnership, Eos Partners SBIC, L.P., a Delaware limited
              partnership, Eos Partners SBIC II, L.P., a Delaware limited
              partnership, SGC Partners II LLC, a Delaware limited liability
              company and Bargo Energy Company, a Texas corporation.*

   10.2  -    Management Agreement dated August 21, 1997, by and among Banc
              One Capital Partners VIII, Ltd., an Ohio limited liability
              company, BOCP Energy Partners, L.P., a Texas limited partnership,
              and EnCap Investments L.L.C., a Texas limited liability company.*
</TABLE>

     *    Filed herewith.

     **   Incorporated by reference to Exhibit 4.9 to Schedule 13D/A dated
          August 14, 1998, as filed regarding the common stock of Future
          Petroleum Corporation owned by Energy Capital Investment Company PLC,
          EnCap Equity 1994 Limited Partnership and EnCap Investments L.L.C.


<PAGE>   1

                                   EXHIBIT 1

                                   AGREEMENT

     The undersigned reporting persons hereby agree that the statements filed
pursuant to this Schedule 13D, to which this Agreement is filed as an exhibit,
are filed on behalf of each of them.

Date: May 21, 1999                 ENCAP ENERGY CAPITAL FUND III, L.P.
                                   By: EnCap Investments L.L.C., General
                                       Partner

                                       By:  /s/ D. Martin Phillips
                                            ----------------------------------
                                            D. Martin Phillips
                                            Managing Director


Date: May 21, 1999                 ENCAP ENERGY CAPITAL FUND III-B, L.P.
                                   By: EnCap Investments L.L.C., General
                                       Partner

                                       By:  /s/ D. Martin Phillips
                                            ----------------------------------
                                            D. Martin Phillips
                                            Managing Director


Date: May 21, 1999                 BOCP ENERGY PARTNERS, L.P.
                                   By: EnCap Investments L.L.C., Manager


                                       By:  /s/ D. Martin Phillips
                                            ----------------------------------
                                            D. Martin Phillips
                                            Managing Director


Date: May 21, 1999                 ENCAP INVESTMENTS L.L.C.


                                       By:  /s/ D. Martin Phillips
                                            ----------------------------------
                                            D. Martin Phillips
                                            Managing Director


                                    Page 16


<PAGE>   1


                               SECOND AMENDMENT TO
                          REGISTRATION RIGHTS AGREEMENT

         This SECOND AMENDMENT TO REGISTRATION RIGHTS AGREEMENT
("Amendment") is made and entered into this 14th day of May, 1999, by and among
Bargo Energy Company, a Texas corporation (the "Company"), Energy Capital
Investment Company PLC, an English investment company ("Energy PLC"), EnCap
Equity 1994 Limited Partnership, a Texas limited partnership ("EnCap LP"), EnCap
Energy Capital Fund III-B, L.P., a Texas limited partnership ("EnCap III-B"),
BOCP Energy Partners, L.P., a Texas limited partnership ("BOCP"), EnCap Energy
Capital Fund III, L.P., a Texas limited partnership ("EnCap III"), Kayne
Anderson Energy Fund, L.P., a Delaware limited partnership ("Kayne"),
BancAmerica Capital Investors SBIC I, L.P., a Delaware limited partnership
("BACI"), Eos Partners, L.P., a Delaware limited partnership ("Eos Partners"),
Eos Partners SBIC, L.P., a Delaware limited partnership ("Eos SBIC"), Eos
Partners SBIC II, L.P., a Delaware limited partnership ("Eos SBIC II" and
together with Eos Partners and Eos SBIC, collectively referred to as "EOS"), and
SGC Partners II LLC, a Delaware limited liability company ("SGCP"), and
evidences the following:

RECITALS:

         A. The Company (as successor by merger to Future Petroleum Corporation,
a Utah corporation), Energy PLC and EnCap LP entered into a Registration Rights
Agreement on August 14, 1998, as amended by a First Amendment to Registration
Rights Agreement dated December 15, 1998 (as amended, the "Agreement"), covering
shares of Common Stock (as defined in the Agreement) issued to Energy PLC and
EnCap LP;

         B. Energy PLC, EnCap III-B, BOCP, EnCap III, Kayne, BACI, EOS and SGCP
(collectively, the "Investors") are parties, along with the Company, to that
certain Stock Purchase Agreement dated May 14, 1999 ("Purchase Agreement"),
pursuant to which the Investors will be issued 43,815,810 shares of Common Stock
(the "New Common Shares");

         C. The parties to the Agreement desire to amend the Agreement to cover
the New Common Shares and to make certain other changes.

AGREEMENT:

         NOW, THEREFORE, for and in consideration of the foregoing Recitals and
the mutual covenants contained herein, the sufficiency of which are hereby
acknowledged, the parties hereto, intending to be legally bound, do hereby agree
as follows:

         Section 1.        Amendments to the Agreement.

         (a)      Section 1(a) of the Agreement is amended as follows:



<PAGE>   2

                           Clause (i) of the first line in the definition of
                  "Registrable Securities" shall be replaced with:

                           "(i) the Fund I Shares and the New Common Shares and"


                           There shall be added to Section 1(a) a definition of
                  "New Common Shares" as follows:

                           " 'New Common Shares' shall mean all the shares of
                           Common Stock issued by the Company pursuant to that
                           certain Stock Purchase Agreement dated May 14, 1999
                           by and among the Company, Energy Capital Investment
                           Company PLC, an English investment company ("Energy
                           PLC"), EnCap Energy Capital Fund III-B, L.P., a Texas
                           limited partnership ("EnCap III-B"), BOCP Energy
                           Partners, L.P., a Texas limited partnership ("BOCP"),
                           EnCap Energy Capital Fund III, L.P., a Texas limited
                           partnership ("EnCap III"), Kayne Anderson Energy
                           Fund, L.P., a Delaware limited partnership ("Kayne"),
                           BancAmerica Capital Investors SBIC I, L.P., a
                           Delaware limited partnership ("BACI"), Eos Partners,
                           L.P., a Delaware limited partnership ("Eos
                           Partners"), Eos Partners SBIC, L.P., a Delaware
                           limited partnership ("Eos SBIC"), Eos Partners SBIC
                           II, L.P., a Delaware limited partnership ("Eos SBIC
                           II" and together with Eos Partners and Eos SBIC,
                           collectively referred to as "EOS"), and SGC Partners
                           II LLC, a Delaware limited liability company
                           ("SGCP")."

         (b) In Section 12(e), "If to Energy PLC or EnCap LP:" shall be replaced
with:

                           "If to Energy PLC, EnCap LP, EnCap III-B, BOCP or
         EnCap III:"

         (c) There shall be added to Section 12(e) the following:

                           "If to Kayne:

                           Kayne Anderson Investment Management
                           1800 Ave. of the Stars, # 1425
                           Los Angeles, California 90067
                           Telecopier No.: 310-284-6490
                           Attention:  Robert B. Sinnott

                           If to BACI:

                           Bank of America Capital Investors
                           100 North Tryon Street, 25th Floor
                           Charlotte, North Carolina 28255
                           Telecopier No.: 704-386-6432


<PAGE>   3

                           Attention:  J. Travis Hain

                           If to EOS:

                           EOS Partners, L.P.
                           320 Park Avenue
                           New York, New York  10022
                           Telecopier No.: 212-832-5815
                           Attention:  Brian D. Young

                           If to SGCP:

                           SGC Partners II LLC
                           c/o SG Capital Partners, LLC
                           1221 Avenue of the Americas, 15th Floor
                           New York, NY  10020
                           Attention:  V. Frank Pottow
                           Fax No.: 212-278-5454"


         Section 2. Binding Effect. Each of EnCap III-B, BOCP, EnCap III, Kayne,
BACI, EOS and SGCP by execution of this Amendment shall be bound by and subject
to the terms and conditions of the Agreement, as amended by this Amendment.

         Section 3. No Other Changes.  Except as explicitly amended by this
Amendment, the terms, conditions, rights and obligations under the Agreement
shall remain in full force and effect.

         Section 4. Consents. The Company represents and warrants that no
consent, approval, order, or authorization of, or declaration, filing, or
registration with, any party is required to be obtained or made in connection
with the execution, delivery, or performance by the Company of the Agreement, as
amended by this Amendment, or the consummation by it of the transactions
contemplated hereby or thereby, other than those consents that have been
received by the Company as of the date hereof and requisite filings and
registrations with, and orders of, the Commission.

         Section 5. Counterparts.  This Amendment may be executed by the parties
hereto in any number of counterparts, each of which shall be deemed an original,
but all of which shall constitute one and the same agreement.



<PAGE>   4

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the date set forth above.

                                     BARGO ENERGY COMPANY


                                     By:
                                        ----------------------------------------
                                        Name:
                                             -----------------------------------
                                        Title:
                                              ----------------------------------


                                     ENCAP EQUITY 1994 LIMITED PARTNERSHIP
                                     By: EnCap Investments L.C., General Partner


                                     By:
                                         ---------------------------------------
                                         D. Martin Phillips
                                         Managing Director


                                     ENERGY CAPITAL INVESTMENT COMPANY PLC


                                     By:
                                         ---------------------------------------
                                         Gary R. Petersen
                                         Director


                                     ENCAP ENERGY CAPITAL FUND III, L.P.
                                     By: EnCap Investments L.C., General Partner


                                     By:
                                         ---------------------------------------
                                         D. Martin Phillips
                                         Managing Director


                                     ENCAP ENERGY CAPITAL FUND III-B, L.P.
                                     By: EnCap Investments L.C., General Partner


                                     By:
                                         ---------------------------------------
                                         D. Martin Phillips
                                         Managing Director

<PAGE>   5



                                     BOCP ENERGY PARTNERS, L.P.
                                     By: EnCap Investments L.C., Manager


                                     By:
                                         ---------------------------------------
                                         D. Martin Phillips
                                         Managing Director


                                     EOS PARTNERS, L.P.


                                     By:
                                         ---------------------------------------
                                         Name:
                                              ----------------------------------
                                         Title:
                                               ---------------------------------


                                      EOS PARTNERS SBIC, L.P.
                                      By: Eos SBIC General, L.P., its general
                                           partner
                                        By: Eos SBIC, Inc., its general partner


                                         By:
                                            ------------------------------------
                                            Name:
                                                 -------------------------------
                                            Title:
                                                  ------------------------------


                                     EOS PARTNERS SBIC II, L.P.
                                     By: Eos SBIC General II, L.P., its general
                                          partner
                                        By: Eos SBIC II, Inc., its general
                                             partner


                                         By:
                                            ------------------------------------
                                            Name:
                                                 -------------------------------
                                            Title:
                                                  ------------------------------


                                     SGC PARTNERS II LLC


                                     By:
                                         ---------------------------------------
                                         V. Frank Pottow
                                         Managing Director




<PAGE>   6
                                     BANCAMERICA CAPITAL INVESTORS SBIC I, L.P.
                                     By: BancAmerica Capital Management SBIC I,
                                          LLC, its general partner
                                      By: BancAmerica Capital Management I,
                                           L.P., its its sole member
                                       By: BACM I GP, LLC, its general partner


                                         By:
                                            ------------------------------------
                                            J. Travis Hain
                                            Managing Director


                                      KAYNE ANDERSON ENERGY FUND, L.P.



                                     By:
                                         ---------------------------------------
                                         Name:
                                              ----------------------------------
                                         Title:
                                               ---------------------------------




<PAGE>   1



                           SECOND AMENDED AND RESTATED
                             SHAREHOLDERS' AGREEMENT

         THIS SECOND AMENDED AND RESTATED SHAREHOLDERS' AGREEMENT (this
"Agreement") is made and entered into this 14th day of May, 1999, by and among
Bargo Energy Company, a Texas corporation ("Company"), B. Carl Price, a Texas
resident ("Price"), Don Wm. Reynolds, a Texas resident ("Reynolds"), Energy
Capital Investment Company PLC, an English investment company ("Energy PLC"),
EnCap Equity 1994 Limited Partnership, a Texas limited partnership ("EnCap LP"),
Bargo Energy Resources, Ltd., a Texas limited partnership ("Resources"), TJG
Investments, Inc., a Texas corporation ("TJG"), Bargo Energy Company, a Texas
general partnership ("BEC"), Tim J. Goff ("Goff"), Thomas Barrow ("Barrow"),
James E. Sowell ("Sowell"), Bargo Operating Company, Inc., a Texas corporation
("Operating"), EnCap Energy Capital Fund III-B, L.P., a Texas limited
partnership ("EnCap III-B"), BOCP Energy Partners, L.P., a Texas limited
partnership ("BOCP"), EnCap Energy Capital Fund III, L.P., a Texas limited
partnership ("EnCap III"), Kayne Anderson Energy Fund, L.P., a Delaware limited
partnership ("Kayne"), BancAmerica Capital Investors SBIC I, L.P., a Delaware
limited partnership ("BACI"), Eos Partners, L.P., a Delaware limited partnership
("Eos Partners"), Eos Partners SBIC, L.P., a Delaware limited partnership ("Eos
SBIC"), Eos Partners SBIC II, L.P., a Delaware limited partnership ("Eos SBIC
II" and together with Eos Partners and Eos SBIC, collectively referred to as
"EOS"), and SGC Partners II LLC, a Delaware limited liability company ("SGCP").

RECITALS:

         A. Company (as successor by merger to Future Petroleum Corporation, a
Utah corporation), Price, Reynolds, Energy PLC, EnCap LP, Resources, TJG, BEC,
Goff, Barrow, Sowell and Operating are currently parties to that certain Amended
and Restated Shareholder's Agreement dated December 15, 1998 ("Original
Agreement"), pursuant to which such parties agreed, among other things, to vote
their shares in favor of the election of the Designated Nominees (as defined by
and more specifically provided in the Original Agreement) named from time to
time by the parties, including the designation by Energy PLC and EnCap LP of two
of the seven directors on Company's Board.

         B. EnCap III-B, Energy PLC, BOCP, EnCap III, Kayne, BACI, EOS and SGCP
(the "Investors") are parties, along with Company, to that certain Stock
Purchase Agreement dated May 14, 1999 ("Purchase Agreement"), pursuant to which
the Investors will be issued shares of Company's common stock, $0.01 par value
("Common Stock") and Company's Cumulative Redeemable Preferred Stock, Series B
(the "Preferred Shares").

         C. The parties hereto deem it in their mutual best interests to make
the agreements contained herein, including providing Company Board of Directors
representation to those Investors making their initial investment in Company.

<PAGE>   2



AGREEMENT:

         NOW, THEREFORE, for and in consideration of the foregoing Recitals and
the mutual agreements contained herein, the sufficiency of which is hereby
acknowledged and confirmed, the parties hereto, intending to be legally bound
hereby, amend and restate the Original Agreement to read in its entirety as
follows:

Section 1.        Definitions.

         (a) The following defined terms shall have the respective meanings
assigned to them below:

                  "Affiliate" shall mean, with respect to any person, (i) any
         person directly or indirectly controlling, controlled by or under
         common control with, such other person, or (ii) any account over which
         such person has management authority in such a manner that the person
         has the power to control the voting and disposition of the securities
         in such account. For purposes of this definition, the term "control,"
         when used with respect to any person, shall mean the possession,
         directly or indirectly, of the power to direct or cause the direction
         of the management and policies of such person, whether through the
         ownership of voting securities, by contract or otherwise; and the terms
         "controlling" and "controlled" shall have meanings correlative to the
         foregoing.

                  "Bargo Group" shall mean TJG, BEC, Resources, Operating, Goff,
         Barrow and Sowell and any transferee of a member of the Bargo Group
         that executes or is required to execute an Addendum Agreement.

                  "Designated Nominee" shall mean a person designated as a
         nominee for election to Company's Board of Directors pursuant to this
         Agreement.

                  "EnCap" shall mean EnCap LP, Energy PLC, EnCap III-B, BOCP,
         EnCap III and any transferee of a member of EnCap that executes or is
         required to execute an Addendum Agreement.

                  "Exempt Transfer" shall mean any sale, disposition or transfer
         effected (i) through a registration under the Securities Act of 1933,
         as amended (the "Securities Act"), (ii) pursuant to and in compliance
         with Rule 144 promulgated by the Securities and Exchange Commission
         pursuant to the Securities Act, provided that such sale does not
         involve a sale of Stock to any person who has beneficial ownership of,
         or who is a member of a "group," as defined under Section 13(d) and
         corresponding rules of the Securities Exchange Act of 1934, as amended
         (the "Exchange Act"), which has beneficial ownership of, more than 5%
         of the outstanding Common Stock, (iii) transfers by a Shareholder to
         any person who is a partner or equity holder of such Shareholder, a
         successor of, or an entity all of the equity interests of which are
         directly or indirectly owned by, the selling Shareholder or an
         Affiliate


                                        2
<PAGE>   3



         of the selling Shareholder, provided that no transfer pursuant to this
         clause (iii) shall be an Exempt Transfer unless the transferee agrees
         in writing to be bound by this Agreement and executes an Addendum
         Agreement hereto, (iv) by any member of the Bargo Group to any person
         who as of the date hereof is an employee of the Company, or (v) any
         bona fide charge, pledge or mortgage by any Shareholder of any shares
         of Stock or Preferred Shares owned or held by it or its rights under
         this Agreement, provided that any disposition of any such shares of
         Stock or Preferred Shares after foreclosure of such charge, pledge or
         mortgage shall be governed by the provisions of this Agreement, and the
         purchaser or purchasers of the shares shall have entered into an
         Addendum Agreement with Company and the other Shareholders.

                  "Investor Group" shall mean the Investors and any transferee
         of an Investor that executes or is required to execute an Addendum
         Agreement.

                  "Investors" has the meaning provided in the Recitals hereto.

                  "Market Price" shall mean the average closing prices of the
         Common Stock for the ten trading days preceding an Offering Notice
         under Section 4(e) over the principal securities exchange in which the
         Common Stock is traded or, if not traded on an exchange, the average
         closing price for ten trading days preceding such Offering Notice as
         reported on the Nasdaq NMS, or if not traded on an exchange or the
         Nasdaq NMS, the average of the closing bid and asked prices of the
         Common Stock for such ten day period.

                  "Original Agreement" has the meaning provided in the Recitals
         hereto.

                  "Price Group" shall mean Price, Reynolds and any transferee of
         a member of the Price Group that executes or is required to execute an
         Addendum Agreement.

                  "Proportionate Share" shall mean the number of shares of Stock
         equal to the product of: (i) the total number of Remaining Subject
         Shares which a proposed transferee has offered to purchase, multiplied
         by (ii) the fraction equal to the total number of shares of Stock which
         a Tag Along Shareholder or Drag Along Shareholder, as the case may be,
         owns, divided by the aggregate number of shares of Stock then
         outstanding.

                  "Purchase Price" shall mean, for purposes of Section 4, an
         amount stated in dollars equal to the total value of a bona fide
         written offer from a person to purchase shares from a Shareholder
         determined as follows: (i) cash payable at closing shall be valued at
         the amount thereof, (ii) a security trading on a public market and for
         which published trading prices are readily available shall be valued at
         its closing sales price (or if a sales price is not available, at the
         average of its closing bid and asked prices) on the last business day
         preceding the date of the first Offering Notice with respect to such
         offer, and (iii) a security not described in clause (ii) or other
         property, including cash payable in one or more installments after
         closing, shall be valued at its fair market value on the last business
         day preceding the date of the first



                                        3
<PAGE>   4

         Offering Notice with respect to such offer as determined at the option
         of the Selling Shareholder or Selling Preferred Shareholder (both as
         defined in Section 4) either (a) by a qualified independent third party
         appraiser (the expense of which shall be paid by the Company) or (b) in
         good faith by the Board of Directors of the Company (excluding any
         member of the Board who is a director, officer or shareholder of the
         Selling Shareholder (or Selling Preferred Shareholder, as applicable)
         or who has the right to purchase a portion of such shares under this
         Agreement) but only if all of such Board members agree to accept the
         assignment to make such determination.

                  "Same Group Shareholders" shall mean with respect to any
         Selling Shareholder, those other members, if any, of the same
         Shareholder Group of which such Selling Shareholder is a member.

                  "Shareholder Group" shall mean the Bargo Group, the Investor
         Group or the Price Group, as applicable.

                  "Shareholders" shall mean the parties to this Agreement and
         any person who executes or is required to execute an Addendum Agreement
         (attached hereto as Exhibit "A").

                  "Stock" shall mean all shares of Common Stock owned or to be
         owned by the Shareholders, whether issued and outstanding at the time
         of the execution of this Agreement or issued subsequent thereto.

                  "Total Voting Power" shall mean the aggregate number of votes
         which may be cast by holders of outstanding Voting Securities.

                  "Voting Securities" shall mean Common Stock and any other
         securities of Company entitled to vote generally for the election of
         directors of Company.

Section 2.        Agreement Regarding Board Representation and Option Plan.

         (a) For so long as any of the Preferred Shares remain outstanding: each
of (i) EOS and SGCP (jointly), (ii) Kayne and (iii) BACI (or the successor or
transferee of any such party), shall be entitled to name one (1) Designated
Nominee for Class III of Company's Board of Directors; the Bargo Group
(including successors and transferees of its members) shall be entitled to name
two (2) Designated Nominees for Class II of Company's Board of Directors; and
EnCap (including successors and transferees of its members) shall be entitled to
name two (2) Designated Nominees for Class I of Company's Board of Directors. In
the event no Preferred Shares are outstanding, then for so long as the Investors
shall beneficially own in the aggregate at least 20% of the issued and
outstanding shares of capital stock of Company (excluding any shares held by the
Bargo Group), on a fully-diluted basis reflecting all shares issuable upon the
exercise of all outstanding rights to acquire shares of Company's capital stock,
then the three members of the Investors owning the most shares of Common Stock
shall be entitled from time to time to name (determined by any two of such


                                        4
<PAGE>   5


three parties) the smallest whole number of Designated Nominees necessary to
constitute at least 40% of the total members of Company's Board of Directors.
For purposes of this Agreement, "beneficial ownership" or "beneficially own"
shall be determined in accordance with Rule 13d-3 under the Exchange Act).

         Notwithstanding the foregoing provisions of this Section 2(a), at the
earlier of (i) two years following the final redemption of all Preferred Shares
and (ii) 6 years following the date hereof, the Shareholders shall regain the
rights regarding Designated Nominees provided by the first sentence of this
Section 2(a), unless at such time the aggregate market value of the Common
Stock, that is held by non-affiliates (excluding, without limitation, the
Shareholders) and included for listing by The Nasdaq Stock Market or the New
York Stock Exchange, is at least $100,000,000.

         (b) Each Shareholder agrees (i) to use its reasonable best efforts to
cause Company's Board of Directors to be composed of seven members, (ii) to use
its reasonable best efforts to cause Company to nominate or cause to be
nominated to Company's Board of Directors all Designated Nominees and (iii) to
vote or cause to be voted all Voting Securities beneficially owned by such
Shareholder in favor of the election of the Designated Nominees to Company's
Board of Directors.

         (c) In the event of the death, incapacity, resignation or removal of a
Designated Nominee preventing his or her serving on Company's Board of
Directors, each Shareholder will promptly cause the election or appointment of
another Designated Nominee of such Shareholder or Shareholder Group, as
applicable, to fill the vacancy created thereby.

         (d) Each Shareholder agrees to cause a designee of the Bargo Group to
be elected Chairman of the Board of Directors of Company. Tim J. Goff shall
serve as the Bargo Group's initial designee. In the event Mr. Goff no longer
serves as the Bargo Group's designee, the Bargo Group agrees that all of its
subsequent replacement designees as Chairman of the Board of Directors shall be
subject to the prior approval of a majority of the Board of Directors of
Company, which approval shall not be unreasonably withheld, and if a replacement
designee is not so approved, the Bargo Group shall designate another designee
acceptable to Company's Board of Directors.

         (e) Each Shareholder agrees to vote all Voting Securities beneficially
owned by such Shareholder for approval of Company's 1999 Stock Incentive Plan
contemplated by the Purchase Agreement. In addition, for so long as Tim Goff
serves as Chief Executive Officer of Company, each Shareholder will cause its
Designated Nominee(s) to approve and authorize the grant of stock option awards
as recommended by Mr. Goff pursuant to Section 1.2(a) of Company's 1999 Stock
Incentive Plan.

         (f) For so long as SGCP owns any shares of Series B Preferred, Company
shall invite a representative designated by SGCP to attend all meetings of
Company's Board of Directors in a non-voting capacity and, in this respect,
shall give such representative copies of all notices, minutes, consents and
other materials that Company provides to its directors; provided, however, that
such SGCP representative shall hold in confidence and trust, and to act in a
fiduciary manner regarding,


                                        5
<PAGE>   6

all information so provided by Company; and provided further, that Company
reserves the right to exclude such SGCP representative from any meeting or
portion thereof at which attendance by such representative could adversely
affect the attorney-client privilege between Company and its legal counsel.

Section 3.        General Restrictions on Transfer.

         The Shareholders agree that, other than an Exempt Transfer, they will
not in any way sell, transfer, assign or otherwise dispose of any shares of
Stock, or any right or interest therein, whether voluntarily or involuntarily or
by operation of law (each of the foregoing transactions is hereinafter referred
to as a "Disposition"), except in accordance with the terms of this Agreement.
Aside from an Exempt Transfer, any purported Disposition in violation of any
provision of this Agreement will be void and will not operate to transfer any
interest or title in such shares to the purported transferee, and will give the
other Shareholders an option and preferential right to purchase such shares in
the manner and on the terms and conditions provided in this Agreement.

Section 4.        Right of First Refusal; Tag-Along Rights; and Drag-Along
                  Rights.

         (a) If any Shareholder desires to make a Disposition of any shares of
Stock owned or held by it pursuant to a bona fide offer (other than in an Exempt
Transfer or pursuant to Section 4(e) hereof), such Shareholder (for purposes of
this Section 4, a "Selling Shareholder") shall offer such shares (the shares of
Stock proposed to be transferred being called the "Subject Shares") for sale at
the Purchase Price to the other Shareholders, all in accordance with the
following provisions of this Section 4.

                  (i) The Selling Shareholder shall deliver a written notice
         ("Offering Notice") to the other Shareholders to sell the Subject
         Shares to the Shareholders pursuant to this Agreement, indicating the
         number of Subject Shares and the proposed Purchase Price. Once the
         Offering Notice is delivered, the offer by the Selling Shareholder may
         not be withdrawn prior to the expiration of the options of the other
         Shareholders, as provided in this Section 4. Within 15 days from the
         receipt of such Offering Notice, the Same Group Shareholders of the
         Selling Shareholder may deliver to the Selling Shareholder written
         notice accepting the offer in the Offering Notice ("Reply Notice"),
         pursuant to which each such Same Group Shareholder may purchase no more
         than the number of shares equal to the product of: (A) the total number
         of Subject Shares, multiplied by (B) the fraction equal to the total
         number of shares of Stock owned by such Same Group Shareholder, divided
         by the aggregate number of shares of Stock owned by all Same Group
         Shareholders. If the Selling Shareholder's Same Group Shareholders do
         not timely elect to exercise their option to purchase all of the
         Subject Shares, then all the other Shareholders outside of such group
         may, within the subsequent 15 days, deliver a Reply Notice, pursuant to
         which each such other Shareholder may purchase no more than the number
         of shares equal to the product of: (A) the total number of Subject
         Shares remaining available for purchase, multiplied by (B) the fraction
         equal to the total number of shares of Stock owned by such other
         Shareholder, divided by


                                        6
<PAGE>   7

         the aggregate number of shares of Stock owned by all other Shareholders
         (who are not members of the Selling Shareholder's Shareholder Group).
         Any such Reply Notice shall constitute an agreement binding upon the
         Selling Shareholder and the Shareholders delivering the Reply Notice to
         sell and purchase the stated portion of the Subject Shares at the
         Purchase Price.

                  (ii) Any dispute concerning the calculation of the Purchase
         Price shall be resolved by the Board of Directors of the Company,
         excluding any member of the Board who is, or is a director, officer,
         partner or stockholder of, the Selling Shareholder or who has a right
         to purchase stock from the Selling Shareholder in the transaction for
         which the Purchase Price is being determined; provided that if all
         directors are excluded pursuant to the foregoing, such disputes shall
         be submitted to binding arbitration as provided in Exhibit B. The
         Purchase Price shall be paid in cash at the closing.

         (b) If the Shareholders do not elect to purchase all of the Subject
Shares (such Subject Shares not being purchased are referred to herein as the
"Remaining Subject Shares"), then the Selling Shareholder shall cause the
proposed transferee (the "Proposed Purchaser") to offer in writing (a "Sale
Notice"), not less than 30 nor more than 120 days prior to the consummation of
any proposed Disposition, to the Shareholders other than the Selling Shareholder
(the "Tag Along Shareholders") to purchase a Proportionate Share of the shares
held by each Tag Along Shareholder. The Sale Notice shall set forth: (i) the
name of the Selling Shareholder and the number of Subject Shares proposed to be
transferred, (ii) the name and address of the Proposed Purchaser, (iii) the
proposed amount and form of consideration and terms and conditions of payment
offered by such Proposed Purchaser and (iv) that the Proposed Purchaser has been
informed of the tag along right provided for in this Section 4(b) and has agreed
to purchase shares of Stock owned by any Tag Along Shareholder in accordance
with the terms hereof. The tag along right may be exercised by any Tag Along
Shareholder by delivery of a written notice to the Proposed Purchaser and
Selling Shareholder (the "Tag Along Notice") within 30 days following its
receipt of the Sale Notice. The Tag Along Notice shall state the amount of
shares of Stock (the "Tag Along Shares") that such Tag Along Shareholder
proposes to include in such transfer to the Proposed Purchaser. To the extent
that a Tag Along Shareholder accepts such tag along offer, the number of shares
of Stock to be sold to the Proposed Purchaser by the Selling Shareholder shall
be reduced to the extent necessary to comply with this Section 4(b). In the
event that the Proposed Purchaser does not purchase all Tag Along Shares from
the Tag Along Shareholders on the same terms and conditions as specified in the
Sale Notice, then the Selling Shareholder shall not be permitted to sell any
Subject Shares to the Proposed Purchaser in the proposed transfer. The closing
of any purchase from the Tag Along Shareholders shall occur contemporaneously
with the purchase and sale of the Subject Shares (as adjusted hereunder) or at
such other time as such Tag Along Shareholders and the Proposed Purchaser shall
agree.

         (c) In the event that (i) any Tag Along Shareholder elects not to
exercise his/its tag-along rights described in Section 4(b) (a "Drag Along
Shareholder"), and (ii) the total shares sought to be purchased by the Proposed
Purchaser constitute at least 50% of the shares of Common Stock


                                        7
<PAGE>   8



outstanding on the date of the Sale Notice, and (iii) Company's Board of
Directors approves such transaction, then each Selling Shareholder shall have
the right (a "Drag Along Right"), beginning on the date that is the first day
after such tag-along right has either expired or been rejected and ending 20
days thereafter, to require each Drag Along Owner to sell a Proportionate Share
owned by such Drag Along Owner to the Proposed Purchaser. All such sales shall
be on the same terms and conditions as, and occur simultaneously with, the sale
of shares to such Proposed Purchaser by such Selling Shareholder.

         (d) If the other Shareholders do not elect to purchase all Subject
Shares, the Selling Shareholder shall, subject to Sections 4(b) and 4(c) hereof,
be freed and discharged, except as herein stated, from all obligations under the
terms of this Agreement other than to sell the remaining Subject Shares to the
purchaser and at the price and upon the terms stated in the Offering Notice, but
only if such sale shall be completed within a period of 90 days from the date of
delivery of the Offering Notice to the other Shareholders. If the Selling
Shareholder does not complete such sale within such 90 day period, all the
provisions of this Agreement, including the provisions of this Section 4, shall
apply to any future sale or offer for sale of such shares of Stock owned by the
Selling Shareholder.

         (e) Upon any involuntary Disposition of a Shareholder's shares of
Stock, such Shareholder or its representative shall send notice thereof,
disclosing in full to the Company and the other Shareholders the nature and
details of such involuntary Disposition and offer such shares for sale at the
Market Price to the other Shareholders, all in accordance with the following
provisions of this Section 4(e). As used in this Section 4(e), the term "Selling
Shareholder" shall mean such Shareholder or its representative, as the case may
be.

                  (i) The Selling Shareholder shall deliver an Offering Notice
         to the other Shareholders. Each of the other Shareholders shall have 30
         days from the receipt of their respective Offering Notice to deliver a
         Reply Notice to the Selling Shareholder. If by their Reply Notice the
         other Shareholders accept the offer of the Selling Shareholder, such
         Reply Notice shall constitute an agreement binding upon the Selling
         Shareholder and the other Shareholders to sell and purchase the offered
         shares at the price and upon the terms stated in the Offering Notice of
         the Selling Shareholder.

                  (ii) In connection with any purchase and sale of shares of
         Stock pursuant to paragraph (i) of this Section 4(e), the purchaser or
         purchasers shall pay the purchase price for the shares in cash at the
         closing.

                  (iii) If the Shareholders do not accept the offer of the
         Selling Shareholder pursuant to the foregoing provisions of this
         Section 4(e), the Selling Shareholder shall be freed and discharged
         from all obligations under the terms of this Agreement except to
         dispose of the offered shares by involuntary Disposition but only if
         the transferee under any such Disposition shall have entered into and
         Addendum Agreement with the Company and the other Shareholders. If such
         involuntary Disposition is not effected, all the provisions of this


                                        8
<PAGE>   9



         Agreement, including the provisions of this Section 4, shall apply to
         any future involuntary Disposition of such shares of Stock owned by the
         Selling Shareholder.

         (f) If any Shareholder desires to make a Disposition of any Preferred
Shares owned or held by it pursuant to a bona fide offer (other than in an
Exempt Transfer), such Shareholder (for purposes of this Section 4(f), a
"Selling Preferred Shareholder") shall offer such shares (the Preferred Shares
proposed to be transferred being called the "Subject Preferred Shares") for sale
at the Purchase Price to the other Shareholders who then own Preferred Shares
("Preferred Shareholders"), all in accordance with the following provisions of
this Section 4(f).

                  (i) The Selling Preferred Shareholder shall deliver a written
         notice ("Preferred Stock Offering Notice") to the other Preferred
         Shareholders to sell the Subject Preferred Shares to the Preferred
         Shareholders pursuant to this Agreement, indicating the number of
         Subject Preferred Shares and the proposed Purchase Price. Once the
         Preferred Stock Offering Notice is delivered, the offer by the Selling
         Preferred Shareholder may not be withdrawn prior to the expiration of
         the options of the other Preferred Shareholders, as provided in this
         Section 4(f). Within 15 days from the receipt of such Preferred Stock
         Offering Notice, the other Preferred Shareholders may deliver to the
         Selling Preferred Shareholder written notice accepting the offer in the
         Preferred Stock Offering Notice, pursuant to which each such other
         Preferred Shareholder may purchase no more than the number of shares
         equal to the product of: (A) the total number of Subject Preferred
         Shares, multiplied by (B) the fraction equal to the total number of
         Preferred Shares owned by such other Preferred Shareholder, divided by
         the aggregate number of Preferred Shares owned by all other Preferred
         Shareholders. Any such reply to the Selling Preferred Shareholder shall
         constitute an agreement binding upon the Selling Preferred Shareholder
         and the Preferred Shareholders delivering such reply to sell and
         purchase the stated portion of the Subject Preferred Shares at the
         Purchase Price.

                  (ii) Any dispute concerning the calculation of the Purchase
         Price shall be resolved by the Board of Directors of the Company,
         excluding any member of the Board who is, or is a director, officer,
         partner or stockholder of, the Selling Preferred Shareholder or who has
         a right to purchase Preferred Shares from the Selling Preferred
         Shareholder in the transaction for which the Purchase Price is being
         determined; provided that if all directors are excluded pursuant to the
         foregoing, such disputes shall be submitted to binding arbitration as
         provided in Exhibit B. The Purchase Price shall be paid in cash at the
         closing.

         If the Preferred Shareholders do not elect to purchase all of the
Subject Preferred Shares (such Subject Preferred Shares not being purchased are
referred to herein as the "Remaining Subject Preferred Shares"), then the
Selling Preferred Shareholder shall cause the proposed transferee (the "Proposed
Preferred Purchaser") to offer in writing (a "Preferred Sale Notice"), not less
than 30 nor more than 120 days prior to the consummation of any proposed
Disposition, to the Preferred Shareholders other than the Selling Preferred
Shareholder (the "Tag Along Preferred Shareholders") to purchase from each Tag
Along Preferred Shareholder a number of the Preferred Shares held by


                                        9
<PAGE>   10

each Tag Along Preferred Shareholder equal to the product of: (i) the total
number of Remaining Subject Preferred Shares which a proposed transferee has
offered to purchase, multiplied by (ii) the fraction equal to the total number
of Preferred Shares which a Tag Along Preferred Shareholder owns, divided by the
aggregate number of Preferred Shares then outstanding. The Preferred Sale Notice
shall set forth: (i) the name of the Selling Preferred Shareholder and the
number of Subject Preferred Shares proposed to be transferred, (ii) the name and
address of the Proposed Preferred Purchaser, (iii) the proposed amount and form
of consideration and terms and conditions of payment offered by such Proposed
Preferred Purchaser and (iv) that the Proposed Preferred Purchaser has been
informed of the tag along right provided for in this Section 4(f) and has agreed
to purchase Preferred Shares owned by any Tag Along Preferred Shareholder in
accordance with the terms hereof. The tag along right may be exercised by any
Tag Along Preferred Shareholder by delivery of a written notice to the Proposed
Preferred Purchaser and Selling Preferred Shareholder (the "Preferred Tag Along
Notice") within 30 days following its receipt of the Preferred Sale Notice. The
Preferred Tag Along Notice shall state the amount of Preferred Shares (the "Tag
Along Preferred Shares") that such Tag Along Preferred Shareholder proposes to
include in such transfer to the Proposed Preferred Purchaser. To the extent that
a Tag Along Preferred Shareholder accepts such tag along offer, the number of
Preferred Shares to be sold to the Proposed Preferred Purchaser by the Selling
Preferred Shareholder shall be reduced to the extent necessary to comply with
this Section 4(f). In the event that the Proposed Preferred Purchaser does not
purchase all Tag Along Preferred Shares from the Tag Along Preferred
Shareholders on the same terms and conditions as specified in the Preferred Sale
Notice, then the Selling Preferred Shareholder shall not be permitted to sell
any Subject Preferred Shares to the Proposed Preferred Purchaser in the proposed
transfer. The closing of any purchase from the Tag Along Preferred Shareholders
shall occur contemporaneously with the purchase and sale of the Subject
Preferred Shares (as adjusted hereunder) or at such other time as such Tag Along
Preferred Shareholders and the Proposed Preferred Purchaser shall agree.

         If the other Preferred Shareholders do not elect to purchase all
Subject Preferred Shares, the Selling Preferred Shareholder shall, subject to
the other provisions of this Section 4(f), be freed and discharged, except as
herein stated, from all obligations under the terms of this Agreement other than
to sell the remaining Subject Preferred Shares to the purchaser and at the price
and upon the terms stated in the Preferred Offering Notice, but only if such
sale shall be completed within a period of 90 days from the date of delivery of
the Preferred Offering Notice to the other Preferred Shareholders. If the
Selling Preferred Shareholder does not complete such sale within such 90 day
period, all the provisions of this Agreement, including the provisions of this
Section 4(f), shall apply to any future sale or offer for sale of such Preferred
Shares owned by the Selling Preferred Shareholder.

Section 5.        Representations and Warranties of Shareholders.

         Each Shareholder hereby represents and warrants to the other
Shareholders as follows:

         (a)      As of the date hereof, such Shareholder is the record and
beneficial owner of the


                                       10
<PAGE>   11



number of shares of Stock and Preferred Shares, as set forth opposite its name
in the attached Exhibit 5(a).

         (b) Such Shareholder, if not a natural person, is duly formed, validly
existing and in good standing under the laws of the jurisdiction of its
formation.

         (c) Such Shareholder has full power and authority to execute, deliver,
and perform this Agreement and to consummate the transactions contemplated
hereby. This Agreement has been duly executed and delivered by such Shareholder
and constitutes a valid and legally binding obligation of such Shareholder,
enforceable against such Shareholder in accordance with its terms.

         (d) The execution, delivery, and performance by such Shareholder of
this Agreement do not and will not (i) if not a natural person, contravene or
violate any provision of its charter or other governing documents, as amended to
the date hereof, (ii) conflict with or result in a violation of any provision
of, or constitute (with or without the giving of notice or the passage of time
or both) a default under, or give rise (with or without the giving of notice or
the passage of time or both) to any right of termination, cancellation, or
acceleration under, any bond, debenture, note, mortgage, indenture, lease,
contract, agreement, or other instrument or obligation to which such Shareholder
is a party or by which such Shareholder or any of its properties may be bound or
(iii) violate any applicable law, rule or regulation binding upon such
Shareholder.

         (e) No consent, approval, order, or authorization of, or declaration,
filing, or registration with, any court or governmental agency or of any third
party is required to be obtained or made by such Shareholder in connection with
the execution, delivery, or performance by such Shareholder of this Agreement.

Section 6.        Survival of Provisions.

         All representations, warranties and covenants made by each party hereto
in this Agreement or any other document contemplated hereby shall be considered
to have been relied upon by the other parties hereto and shall survive the
execution and delivery of this Agreement or such other document, regardless of
any investigation made by or on behalf of any such party.

Section 7.        Entire Agreement.

         This Agreement and the other documents contemplated hereunder contain
the entire understanding of the parties hereto with respect to the subject
matter hereof and supersede all prior agreements, understandings, negotiations,
and discussions among the parties with respect to such subject matter,
including, without limitation that certain Voting Agreement dated November 25,
1997, by and between Company, Energy PLC, EnCap LP, Carl Price and Don Wm.
Reynolds, that certain Purchase and Sale Agreement dated November 25, 1997, by
and among Company, Energy PLC, EnCap LP and Gecko Booty 1994 I Limited
Partnership, and the Original Agreement. Neither Company nor any Shareholder
shall be a party to any agreement regarding the voting or Disposition


                                       11
<PAGE>   12
of capital stock of Company, as such, unless Company and all such Shareholders
are also parties to that agreement, except with the written consent of Company
and all such Shareholders who are not parties to such an agreement.

Section 8.        Amendments.

         This Agreement may be amended, modified, supplemented, restated or
discharged only by an instrument approved in writing by the members in each
Shareholder Group owning at least two-thirds of the shares owned by such entire
group.

Section 9.        Notices.

         All notices and other communications required under this Agreement
shall (unless otherwise specifically provided herein) be in writing and be
delivered personally, by recognized commercial courier or delivery service
(which provides a receipt), by telecopier (with receipt acknowledged), or by
registered or certified mail (postage prepaid), at the following addresses:

If to a member of the Bargo Group, other than Sowell:

                           c/o Bargo Energy Company
                           700 Louisiana, Suite 3700
                           Houston, Texas 77002
                           Attention:  Tim J. Goff
                           Fax No.:  713-236-9799

If to Sowell:              James E. Sowell
                           3131 McKinney Avenue, Suite 200
                           Dallas, Texas 75204

If to B. Carl Price or Don Wm. Reynolds:

                           c/o Bargo Energy Company
                           700 Louisiana, Suite 3700
                           Houston, Texas 77002
                           Attention:  Carl Price
                           Fax No.:  713-236-9799



                                       12
<PAGE>   13



If to EnCap:

                           c/o EnCap Investments, L.C.
                           1100 Louisiana, Suite 3150
                           Houston, Texas  77002
                           Attention: D. Martin Phillips
                           Fax No.:  713-659-6130

If to Kayne:

                           Kayne Anderson Investment Management
                           1800 Ave. of the Stars, # 1425
                           Los Angeles, California 90067
                           Attention:  Robert B. Sinnott
                           Fax No.: 310-284-6490

If to BACI:

                           Bank of America Capital Investors
                           100 North Tryon Street, 25th Floor
                           Charlotte, North Carolina 28255
                           Attention:  J. Travis Hain
                           Fax No.: 704-386-6432

If to EOS:

                           EOS Partners, L.P.
                           320 Park Avenue
                           New York, New York  10022
                           Attention:  Brian D. Young
                           Fax No.: 212-832-5815

If to SGCP:

                           SGC Partners II LLC
                           c/o SG Capital Partners LLC
                           1221 Avenue of the Americas, 15th Floor
                           New York, NY  10020
                           Attention:  V. Frank Pottow
                           Fax No.: 212-278-5454


and shall be considered delivered on the date of receipt. A Shareholder may
specify as its proper


                                       13
<PAGE>   14



address any other post office address within the continental limits of the
United States by giving notice to the other Shareholders, in the manner provided
in this Section, at least ten (10) days prior to the effective date of such
change of address.

         Any party hereto may designate a different address by notice to the
other parties.

Section 10.       Termination.

         This Agreement shall terminate upon the earlier of (i) the written
consent of each of the Shareholders, (ii) when the Shareholders collectively
hold an aggregate of less than 20% (or when, with respect to a Shareholder
Group, such Shareholder Group owns less than 5% (or when, with respect to a
Shareholder, such Shareholder owns less than 0.5%) of the issued and outstanding
shares of Common Stock (and this Agreement shall be terminated solely with
respect to such Shareholder Group or Shareholder, as applicable, but shall
remain in effect as to those Shareholder Groups owning 5% (and those
Shareholders owning 0.5%) or more of the issued and outstanding shares of Common
Stock)), or (iii) the closing of a public offering of the Common Stock, pursuant
to an effective registration statement filed with the Securities and Exchange
Commission, resulting in gross proceeds (before deduction of fees and
commissions) to the Company of at least $100,000,000.

Section 11.       Power of Attorney.

         For the purpose of executing an Addendum Agreement, all the
Shareholders hereby appoint Company as their agent and attorney to execute such
Addendum Agreement on their behalf and expressly bind themselves to the Addendum
Agreement by Company's execution of that Agreement without further action on
their part.

Section 12.       No Waiver.

         The failure of any party hereto to insist upon strict performance of a
covenant hereunder or of any obligation hereunder, irrespective of the length of
time for which such failure continues, shall not be a waiver of such party's
right to demand strict compliance in the future. No consent or waiver, express
or implied, to or of any breach or default in the performance of any obligation
hereunder shall constitute a consent or waiver to or of any other breach or
default in the performance of the same or any other obligation hereunder.

Section 13.       Choice of Law.

         This Agreement shall be governed by the internal laws of the State of
Texas, without regard to principles of conflicts of law.

Section 14.       Successors and Assigns.

         This Agreement shall be binding on and inure to the benefit of the
parties hereto and their respective successors and assigns.


                                       14
<PAGE>   15

Section 15.       References and Construction.

         (a) The provisions of Sections 3 and 4 hereof shall not apply to
transactions between members of the same Shareholder Group. The parties hereto
consent to the pledge of shares pursuant to those certain Pledge Agreements
(stock) by Resources, Energy PLC and EnCap LP, Price, TJG, BEC, Goff, Barrow,
Sowell and Operating, respectively, in favor of Bank of America National Trust
and Savings Association and agree that Sections 3 and 4 hereof shall not be
applicable to such pledges or any foreclosures or resales thereunder.

         (b) All references in this Agreement to articles, sections, subsections
and other subdivisions refer to corresponding articles, sections, subsections
and other subdivisions of this Agreement unless expressly provided otherwise.

         (c) Titles appearing at the beginning of any of such subdivisions are
for convenience only and shall not constitute part of such subdivisions and
shall be disregarded in construing the language contained in such subdivisions.

         (d) The words "this Agreement", "this instrument", "herein", "hereof",
"hereby", "hereunder" and words of similar import refer to this Agreement as a
whole and not to any particular subdivision unless expressly so limited.

         (e) Words in the singular form shall be construed to include the plural
and vice versa, unless the context otherwise requires.

         (f) Unless the context otherwise requires or unless otherwise provided
herein, the terms defined in this Agreement which refer to a particular
agreement, instrument or document also refer to and include all renewals,
extensions, modifications, amendments or restatements of such agreement,
instrument or document, provided that nothing contained in this subsection shall
be construed to authorize such renewal, extension, modification, amendment or
restatement.

         (g) Examples shall not be construed to limit, expressly or by
implication, the matter they illustrate.

         (h) The word "or" is not exclusive and the word "includes" and its
derivatives means "includes, but is not limited to" and corresponding derivative
expressions.

         (i) No consideration shall be given to the fact or presumption that one
party had a greater or lesser hand in drafting this Agreement.

         (j) All references herein to "$" or "dollars" shall refer to U.S.
Dollars.


                                       15
<PAGE>   16

Section 16.       Legends.

         The certificate or certificates representing the Stock now owned or
hereafter acquired by the Shareholders shall have conspicuously stamped,
printed, or typed on the face or back thereof a legend substantially in the
following form:

         "The shares represented hereby are subject to that certain Second
         Amended and Restated Shareholders' Agreement, dated as of May 14, 1999,
         by and among the Company, and certain stockholders of the Company. A
         copy of such shareholders' agreement and all applicable amendments
         thereto will be furnished by the Company to the holder hereof without
         charge upon written request to the Company at its principal place of
         business or registered office."

Section 17.       Specific Performance.

         Each of the parties hereto recognizes that any breach of the terms of
this Agreement may give rise to irreparable harm for which money damages would
not be an adequate remedy, and accordingly agree that, in addition to other
remedies, any nonbreaching party shall be entitled to enforce the terms of this
Agreement by a decree of specific performance without the necessity of proving
the inadequacy as a remedy of money damages.

Section 18.       Counterparts.

         This Agreement may be executed in multiple counterparts, with each such
counterpart constituting an original and all of such counterparts constituting
but one and the same agreement.



                                       16
<PAGE>   17

         IN WITNESS WHEREOF, this Second Amended and Restated Shareholder's
Agreement has been executed as of the date above first written.

                                       BARGO ENERGY COMPANY


                                       By:
                                           -------------------------------------
                                           Name:
                                                --------------------------------
                                           Title:
                                                 -------------------------------

                                       ENCAP EQUITY 1994 LIMITED PARTNERSHIP
                                       By: EnCap Investments L.C., General
                                             Partner


                                       By:
                                           -------------------------------------
                                           D. Martin Phillips
                                           Managing Director


                                       ENERGY CAPITAL INVESTMENT COMPANY PLC


                                       By:
                                           -------------------------------------
                                           Gary R. Petersen
                                           Director


                                       TJG INVESTMENTS, INC.


                                       By:
                                           -------------------------------------
                                           Tim J. Goff
                                           President


                                       BARGO ENERGY COMPANY


                                       By:
                                           -------------------------------------
                                           Tim J. Goff
                                           Manager




<PAGE>   18

                                       BARGO ENERGY RESOURCES, LTD.
                                       By: Bargo Operating Company, Inc.,
                                             General Partner


                                       By:
                                           -------------------------------------
                                           Tim J. Goff
                                           President


                                       BARGO OPERATING COMPANY, INC.


                                       By:
                                           -------------------------------------
                                           Tim J. Goff
                                           President



                                       -----------------------------------------
                                       Tim J. Goff



                                       -----------------------------------------
                                       Thomas Barrow



                                       -----------------------------------------
                                       James E. Sowell



                                       -----------------------------------------
                                       B. Carl Price



                                       -----------------------------------------
                                       Don Wm. Reynolds


                                       ENCAP ENERGY CAPITAL FUND III, L.P.
                                       By: EnCap Investments L.C., General
                                             Partner


                                       By:
                                           -------------------------------------
                                           D. Martin Phillips
                                           Managing Director



<PAGE>   19
                                       ENCAP ENERGY CAPITAL FUND III-B, L.P.
                                       By: EnCap Investments L.C., General
                                            Partner


                                       By:
                                           -------------------------------------
                                           D. Martin Phillips
                                           Managing Director


                                       BOCP ENERGY PARTNERS, L.P.
                                       By: EnCap Investments L.C., Manager


                                       By:
                                           -------------------------------------
                                           D. Martin Phillips
                                           Managing Director


                                                     EOS PARTNERS, L.P.


                                       By:
                                           -------------------------------------
                                           Name:
                                                --------------------------------
                                           Title:
                                                 -------------------------------


                                       EOS PARTNERS SBIC, L.P.
                                       By: Eos SBIC General, L.P., its general
                                            partner
                                        By: Eos SBIC, Inc., its general partner


                                              By:
                                                  ------------------------------
                                                  Name:
                                                       -------------------------
                                                  Title:
                                                        ------------------------


                                       EOS PARTNERS SBIC II, L.P.
                                       By: Eos SBIC General II, L.P., its
                                            general partner
                                         By: Eos SBIC II, Inc., its general
                                              partner

                                              By:
                                                  ------------------------------
                                                  Name:
                                                       -------------------------
                                                  Title:
                                                        ------------------------


<PAGE>   20





                                      SGC PARTNERS II LLC


                                      By:
                                          -------------------------------------
                                          V. Frank Pottow
                                          Managing Director


                                      BANCAMERICA CAPITAL INVESTORS SBIC I, L.P.
                                      By: BancAmerica Capital Management SBIC I,
                                           LLC, its general partner
                                       By: BancAmerica Capital Management I,
                                             L.P., its
                                           its sole member
                                        By: BACM I GP, LLC, its general partner


                                            By:
                                               ---------------------------------
                                               J. Travis Hain
                                               Managing Director


                                      KAYNE ANDERSON ENERGY FUND, L.P.



                                      By:
                                         ---------------------------------------
                                         Name:
                                              ----------------------------------
                                         Title:
                                               ---------------------------------


<PAGE>   21



                                  EXHIBIT 5(a)



<TABLE>
<CAPTION>
Shareholder                                   Number of Shares            Number of
                                                  of Stock            Preferred Shares
- ---------------------------------------------------------------------------------------
<S>                                           <C>                     <C>
B. Carl Price                                     1,126,869                        0
Don Wm. Reynolds                                    753,362                        0
Energy Capital Investment Company PLC             4,241,598                        0
EnCap Equity 1994 Limited Partnership             2,424,973                        0
TJG Investments, Inc.                             1,255,000                        0
Bargo Energy Company                              7,078,333                        0
Tim J. Goff                                       8,406,667                        0
Thomas Barrow                                     8,666,667                        0
James E. Sowell                                   8,666,666                        0
Bargo Operating Company                             260,000                        0
Bargo Energy Resources, Ltd.                      4,694,859                        0
EnCap Energy Capital Fund III-B, L.P.             4,222,999                  481,904
BOCP Energy Partners, L.P.                        1,366,277                  155,911
EnCap Energy Capital Fund III, L.P.               5,583,755                  637,185
Kayne Anderson Energy Fund, L.P.                  8,763,162                1,000,000
BancAmerica Capital Investors SBIC I, L.P.       13,144,743                1,500,000
Eos Partners, L.P.                                  328,619                   37,500
Eos Partners SBIC, L.P.                           3,417,633                  390,000
Eos Partners SBIC II, L.P.                          635,329                   72,500
SGC Partners II LLC                               4,381,581                  500,000
</TABLE>

<PAGE>   22



                                    EXHIBIT A

                               ADDENDUM AGREEMENT

         Addendum Agreement made this ____ day of ________, ____, by and between
____________________________________________ (the "New Shareholder") and Bargo
Energy Company, a Texas corporation (the "Company"), and the other shareholders
(the "Shareholders") of the Company, who are parties to that certain Second
Amended and Restated Shareholders' Agreement dated May 14, 1999 (the
"Agreement"), between the Company and the Shareholders.

                               W I T N E S E T H:

         WHEREAS, the Company and the Shareholders entered into the Agreement to
impose certain restrictions and obligations upon themselves and the shares of
Common Stock, $0.01 par value, and Preferred Stock of the Company held by them
(the "Shares");

         WHEREAS, the New Shareholder is desirous of becoming a shareholder of
the Company; and

         WHEREAS, the Company and the Shareholders have required in the
Agreement that in certain circumstances certain persons being offered Shares
must enter into an Addendum Agreement binding the New Shareholder to the
Agreement to the same extent as if it was an original party thereto, so as to
promote the mutual interests of the Company, the Shareholders and the New
Shareholders by imposing the same restrictions and obligations on the New
Shareholder and the shares of Common Stock and/or Preferred Stock, as
applicable, to be acquired by it as were imposed upon the Shareholders under the
Agreement;

         NOW, THEREFORE, in consideration of the mutual promises of the parties,
and as a condition of the purchase of the shares of Common Stock in the Company,
the New Shareholder acknowledges that it has read the Agreement. The New
Shareholder shall be bound by, and shall have the benefit of, all the terms and
conditions set out in the Agreement to the same extent as if it was a
"Shareholder" as defined in the Agreement. This Addendum Agreement shall be
attached to and become a part of the Agreement.

                                                   New Shareholder


                                                   By
                                                     ---------------------------

Address for notices under
Section 9 of Agreement:
                            ---------------------------

                            ---------------------------

                            ---------------------------


<PAGE>   23
                                    EXHIBIT B

                                   ARBITRATION


         In the event that a dispute or controversy as described in Section 4(a)
or 4(f) should arise, such dispute or controversy shall be settled in
arbitration in Houston, Texas and for this purpose each of the parties hereby
expressly consents to such arbitration in such place. In the event the parties
cannot mutually agree upon an arbitrator to settle their dispute or controversy,
each party to the dispute shall select one arbitrator. In the event that there
are only two parties to the dispute, the arbitrators selected by each party
shall select a third arbitrator. The decision of said arbitrators shall be
binding upon the parties for all purposes. If any party fails to select an
arbitrator within 15 days after written demand from the other party or parties
to do so, or if, in the event that there are only two parties to the dispute,
the two arbitrators selected fail to select a third arbitrator within 15 days
after the last of such selected arbitrators is appointed, such other arbitrator
or arbitrators shall be selected pursuant to the then existing rules and
regulations of the American Arbitration Association. Such arbitration shall be
conducted in accordance with the then existing rules and regulations of the
American Arbitration Association to the extent such rules and regulations are
not inconsistent with this Agreement. The expense of each arbitrator shall be
borne by the party selecting the arbitrator. The expense of any third arbitrator
shall be borne equally by the two parties to the dispute or controversy. For
purposes hereof, in the case of a dispute or controversy where the Offering
Notice or Preferred Offering Notice, as applicable, was submitted by, or the
transaction otherwise involves, more than one Selling Shareholder or Selling
Preferred Shareholder, all such selling Shareholders shall collectively
constitute a single party. Likewise, where the transaction involves more than
one purchasing Shareholder, all such purchasing Shareholders shall constitute a
single party.




<PAGE>   1

- --------------------------------------------------------------------------------

                            STOCK PURCHASE AGREEMENT


                                  by and among



                              Bargo Energy Company


                                       and

                     Energy Capital Investment Company PLC,
                     EnCap Energy Capital Fund III-B, L.P.,
                           BOCP Energy Partners, L.P.,
                      EnCap Energy Capital Fund III, L.P.,
                        Kayne Anderson Energy Fund, L.P.,
                   BancAmerica Capital Investors SBIC I, L.P.,
                               Eos Partners, L.P.,
                            Eos Partners SBIC, L.P.,
                         Eos Partners SBIC II, L.P., and
                               SGC Partners II LLC



                                  May 14, 1999


- --------------------------------------------------------------------------------

<PAGE>   2

                            STOCK PURCHASE AGREEMENT


         This STOCK PURCHASE AGREEMENT (this "Agreement") is dated as of May 14,
1999 by and among Energy Capital Investment Company PLC, an English investment
company ("Energy PLC"), EnCap Energy Capital Fund III-B, L.P., a Texas limited
partnership ("EnCap III-B"), BOCP Energy Partners, L.P., a Texas limited
partnership ("BOCP"), EnCap Energy Capital Fund III, L.P., a Texas limited
partnership ("EnCap III"), Kayne Anderson Energy Fund, L.P., a Delaware limited
partnership ("Kayne"), BancAmerica Capital Investors SBIC I, L.P., a limited
partnership ("BACI"), Eos Partners, L.P., a Delaware limited partnership ("Eos
Partners"), Eos Partners SBIC, L.P., a Delaware limited partnership ("Eos
SBIC"), Eos Partners SBIC II, L.P., a Delaware limited partnership ("Eos SBIC
II" and together with Eos Partners and Eos SBIC, collectively referred to as
"EOS"), and SGC Partners II LLC, a Delaware limited liability company ("SGCP")
(each individually, a "Buyer," and collectively, the "Buyers") and Bargo Energy
Company, a Texas corporation.

         WHEREAS, the Company (defined below) desires to issue to Buyers, and
Buyers desire to purchase, certain shares of the Company's Cumulative Redeemable
Preferred Stock, Series B, par value $.01 per share (the "Preferred Stock"), and
certain shares of the Company's Common Stock, par value $.01 per share (the
"Common Stock");

         NOW, THEREFORE, in consideration of the premises and the mutual
covenants and agreements herein contained, and intending to be legally bound
hereby, the Company and Buyers hereby agree as follows:

                                   ARTICLE I.

                            TERMS OF THE TRANSACTION

         1.1 Agreement to Issue Shares. At the Closing, and on the terms and
subject to the conditions set forth in this Agreement, the Company shall sell
and deliver to each Buyer, and each Buyer (severally) shall purchase and accept
from the Company as set forth beside its name on Schedule 1.1, the number of
shares of Preferred Stock and the number of shares of Common Stock (as issued to
all Buyers, collectively, the "Shares").

         1.2 Purchase Price and Payment. In consideration of the sale of the
Shares, each Buyer shall pay to the Company at the Closing the purchase price
set forth beside its name on Schedule 1.1, the aggregate of which shall be the
"Purchase Price." Each Buyer shall pay its portion of the Purchase Price to the
Company in immediately available funds by confirmed wire transfer to a bank
account




                                        1
<PAGE>   3
to be designated by the Company (such designation to occur no later than the
third business day prior to the Closing Date) or in the form of a certified or
bank cashier's check payable to the order of the Company.

                                   ARTICLE II.

                                     CLOSING

         The closing of the transactions contemplated hereby (the "Closing")
shall take place (i) at the offices of Thompson & Knight, P.C., 1700 Chase
Tower, 600 Travis, Houston, TX 77002 at 10:00 a.m., local time, on May 14, 1999,
or (ii) at such other time or place or on such other date as the parties hereto
shall agree. The date on which the Closing is required to take place is herein
referred to as the "Closing Date." All Closing transactions shall be deemed to
have occurred simultaneously.


                                  ARTICLE III.

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

         The Company represents and warrants to Buyers that:

         3.1 Corporate Organization. The Company is a corporation duly
organized, validly existing, and in good standing under the laws of Texas and
has all requisite corporate power and corporate authority to own, lease, and
operate its properties and to carry on its business as now being conducted. No
actions or proceedings to dissolve the Company are pending or, to the best
knowledge of the Company, threatened.

         3.2 Qualification. The Company is duly qualified or licensed to do
business as a foreign corporation and is in good standing in each of the
jurisdictions set forth on Schedule 3.2, which are all the jurisdictions in
which it owns, leases, or operates property or in which such qualification or
licensing is required for the conduct of its business.

         3.3 Charter and Bylaws. The Company has made available to Buyers
accurate and complete copies of (i) the charter and bylaws of each of the
Company and the Subsidiaries as currently in effect, (ii) the stock records of
each of the Company and the Subsidiaries, and (iii) the minutes of all meetings
of the respective Boards of Directors of the Company and the Subsidiaries, any
committees of such Boards, and the shareholders of the Company and the
Subsidiaries (and all consents in lieu of such meetings). Such records, minutes,
and consents accurately reflect the stock ownership of the Company and the
Subsidiaries and all actions taken by such Boards of Directors,



                                        2
<PAGE>   4
committees, and shareholders. Neither the Company nor any Subsidiary is in
violation of any provision of its charter or bylaws, other than violations
which, individually or in the aggregate, do not and will not have a Material
Adverse Effect on the Company.

         3.4 Capitalization of the Company. The authorized capital stock of the
Company consists of (i) 120,000,000 shares of Common Stock, of which, as of the
date hereof, 48,357,786 shares are outstanding and no shares are held in the
Company's treasury, and (ii) 5,000,000 shares of preferred stock, par value $.01
per share, of which, as of the date hereof, no shares are outstanding and no
such shares are held in the Company's treasury. All outstanding shares of
capital stock of the Company have been validly issued and are fully paid and
nonassessable, and no shares of capital stock of the Company are subject to, nor
have any been issued in violation of, preemptive or similar rights. All
issuances, sales, and repurchases by the Company of shares of its capital stock
have been effected in compliance with all Applicable Laws, including without
limitation applicable federal and state securities laws. The Preferred Stock
constitutes (and at the Closing will constitute) all the outstanding shares of
preferred stock of the Company. As of the date hereof, an aggregate of 660,000
shares of Common Stock of the Company are reserved for issuance and are issuable
upon the exercise of outstanding stock options granted under the Company's stock
option plans; furthermore, an aggregate of 275,000 shares of Common Stock of the
Company are reserved for issuance and are issuable upon the exercise of
outstanding warrants (subject to certain anti-dilution provisions applicable
thereto). Except as disclosed above in this Section and in connection with the
transactions contemplated by this Agreement, there are (and as of the Closing
Date there will be) outstanding (i) no shares of capital stock or other voting
securities of the Company, (ii) no securities of the Company convertible into or
exchangeable for shares of capital stock or other voting securities of the
Company, (iii) no options or other rights to acquire from the Company, and no
obligation of the Company to issue or sell, any shares of capital stock or other
voting securities of the Company or any securities of the Company convertible
into or exchangeable for such capital stock or voting securities, and (iv) no
equity equivalents, interests in the ownership or earnings, or other similar
rights of or with respect to the Company. Other than regarding the Shares or as
disclosed on Schedule 3.4, there are (and as of the Closing Date there will be)
no outstanding obligations of the Company or any Subsidiary to repurchase,
redeem, or otherwise acquire any of the foregoing shares, securities, options,
equity equivalents, interests, or rights.

         3.5 Authority Relative to This Agreement. The Company has full
corporate power and corporate authority to execute, deliver, and perform this
Agreement and the Ancillary Documents to which it is a party and to consummate
the transactions contemplated hereby and thereby. The execution, delivery, and
performance by the Company of this Agreement and the Ancillary Documents to
which it is a party, and the consummation by it of the transactions contemplated
hereby and thereby, have been duly authorized by all necessary corporate action
of the Company. This Agreement has been duly executed and delivered by the
Company and constitutes, and each



                                        3
<PAGE>   5
Ancillary Document executed or to be executed by the Company has been, or when
executed will be, duly executed and delivered by the Company and constitute, or
when executed and delivered will constitute, valid and legally binding
obligations of the Company, enforceable against the Company in accordance with
their respective terms, except that such enforceability may be limited by (i)
applicable bankruptcy, insolvency, reorganization, moratorium, and similar laws
affecting creditors' rights generally and (ii) equitable principles which may
limit the availability of certain equitable remedies (such as specific
performance) in certain instances.

         3.6 Noncontravention. The execution, delivery, and performance by the
Company of this Agreement and the Ancillary Documents to which it is a party and
the consummation by it of the transactions contemplated hereby and thereby do
not and will not (i) conflict with or result in a violation of any provision of
the charter or bylaws or other governing instruments of the Company or any
Subsidiary, (ii) conflict with or result in a violation of any provision of, or
constitute (with or without the giving of notice or the passage of time or both)
a default under, or give rise (with or without the giving of notice or the
passage of time or both) to any right of termination, cancellation, or
acceleration under, or require any consent, approval, authorization or waiver
of, or notice to, any party to, any bond, debenture, note, mortgage, indenture,
lease, contract, agreement, or other instrument or obligation to which the
Company or any Subsidiary is a party or by which the Company or any Subsidiary
or any of their respective properties may be bound or any Permit held by the
Company or any Subsidiary, (iii) result in the creation or imposition of any
Encumbrance upon the properties of the Company or any Subsidiary, or (iv)
assuming compliance with the matters referred to in Section 3.7, violate any
Applicable Law binding upon the Company or any Subsidiary, except, in the case
of clauses (ii), (iii) and (iv) above, for any such conflicts, violations,
defaults, terminations, cancellations, accelerations, or Encumbrances which
would not, individually or in the aggregate, have a Material Adverse Effect on
the Company, and except, in the case of clause (ii) above, for (A) such
consents, approvals, authorizations, and waivers that have been obtained and are
unconditional and in full force and effect and such notices that have been duly
given and (B) such consents, approvals, authorizations, waivers, and notices
that are disclosed on Schedule 3.6 or otherwise expressly contemplated by the
Ancillary Documents.

         3.7 Governmental Approvals. No consent, approval, order, or
authorization of, or declaration, filing, or registration with, any Governmental
Entity is required to be obtained or made by the Company or any Subsidiary in
connection with the execution, delivery, or performance by the Company of this
Agreement and the Ancillary Documents to which it is a party or the consummation
by it of the transactions contemplated hereby or thereby, other than as set
forth on Schedule 3.7.





                                       4

<PAGE>   6



         3.8  Subsidiaries.

         (a) The Company does not own, directly or indirectly, any capital stock
of, or other equity interest in, any corporation or have any direct or indirect
equity or ownership interest in any other person, other than the Subsidiaries.
Schedule 3.8 lists each Subsidiary, the jurisdiction of incorporation of each
Subsidiary, and the authorized and outstanding capital stock of each Subsidiary.
Each Subsidiary is a corporation duly organized, validly existing, and in good
standing under the laws of the jurisdiction of its incorporation. As detailed on
Schedule 3.8, each Subsidiary is duly qualified or licensed to do business as a
foreign corporation and is in good standing in each of the jurisdictions in
which it owns, leases, or operates property or in which such qualification or
licensing is required for the conduct of its business. Each Subsidiary has all
requisite corporate power and corporate authority to own, lease, and operate its
properties and to carry on its business as now being conducted. No actions or
proceedings to dissolve any Subsidiary are pending, or to the knowledge of the
Company, threatened.

         (b) Except as otherwise indicated on Schedule 3.8, all the outstanding
capital stock or other equity interests of each Subsidiary are owned directly or
indirectly by the Company, free and clear of all Encumbrances. All outstanding
shares of capital stock of each Subsidiary have been validly issued and are
fully paid and nonassessable. No shares of capital stock or other equity
interests of any Subsidiary are subject to, nor have any been issued in
violation of, preemptive or similar rights.

         (c) Except as set forth on Schedule 3.8, there are (and as of the
Closing Date there will be) outstanding (i) no shares of capital stock or other
voting securities of any Subsidiary, (ii) no securities of the Company or any
Subsidiary convertible into or exchangeable for shares of capital stock or other
voting securities of any Subsidiary, (iii) no options or other rights to acquire
from the Company or any Subsidiary, and no obligation of the Company or any
Subsidiary to issue or sell, any shares of capital stock or other voting
securities of any Subsidiary or any securities convertible into or exchangeable
for such capital stock or voting securities, and (iv) no equity equivalents,
interests in the ownership or earnings, or other similar rights of or with
respect to any Subsidiary. There are (and as of the Closing Date there will be)
no outstanding obligations of the Company or any Subsidiary to repurchase,
redeem, or otherwise acquire any of the foregoing shares, securities, options,
equity equivalents, interests, or rights.

         3.9 Shares. The Shares to be issued by the Company at the Closing have
been duly authorized for such issuance. When issued and delivered by the Company
in accordance with the provisions of this Agreement, the Shares will be validly
issued, fully paid, and nonassessable. The issuance of the Shares pursuant to
this Agreement is not subject to any preemptive or similar rights. When issued,
the shares of Common Stock listed on Schedule 1.1 will in the aggregate
represent 40% of the issued and outstanding shares of capital stock of the
Company, on a fully-diluted basis reflecting all shares issuable upon the
exercise of all outstanding rights to acquire shares of the Company's capital
stock (including after giving effect to the transactions contemplated hereby).





                                        5
<PAGE>   7

         3.10 SEC Filings. Except as previously disclosed to Buyers, the Company
is current in its obligations to file all periodic reports and proxy statements
with the Securities and Exchange Commission required to be filed under the
Exchange Act. Except as previously disclosed to Buyers, the Company's Annual
Report on Form-10KSB for the fiscal year ended December 31, 1998, Report on Form
8-K filed on February 26, 1999, Information Statement on Schedule 14C filed on
March 9, 1999 and Report on Form 8-K/A filed on May 3, 1999 (collectively, the
"SEC Documents") are all of the documents the Company was required to file with
the Securities and Exchange Commission since January 1, 1999. As of their
respective dates, the SEC Documents complied as to form in all material respects
with the requirements of the Exchange Act and the rules and regulations of the
Securities and Exchange Commission thereunder applicable to such SEC Documents.
The SEC Documents do not contain an untrue statement of a material fact or omit
to state a material fact required to be stated therein or necessary to make the
statements therein not misleading in light of circumstances then existing. The
audited consolidated financial statements and unaudited consolidated interim
financial statements, if any, of the Company included in the SEC Documents
comply as to form in all material respects with applicable accounting
requirements and with the published rules and regulations of the Securities and
Exchange Commission with respect thereto; present fairly in all material
respects, in conformity with GAAP applied on a consistent basis, the
consolidated financial position of the Company as of the dates thereof and its
consolidated results of operations and changes in financial position for the
periods then ended (subject to normal year-end adjustments in the case of any
unaudited interim financial statements and the fact that certain information and
notes have been condensed or omitted in accordance with the Exchange Act and the
rules promulgated thereunder); and are in all material respects in accordance
with the books of account and records of the Company and the Subsidiaries. There
are no material liabilities of the Company or any Subsidiary (contingent or
otherwise), other than as disclosed in the SEC Documents and the financial
statements included therein.

         3.11 Absence of Certain Changes. Except as disclosed in the SEC
Documents or on Schedule 3.11, since January 1, 1999: (i) there has not been any
change, development, or effect, individually or in the aggregate, that has had,
or might reasonably be expected to have, a Material Adverse Effect on the
Company or a Subsidiary; (ii) the businesses of the Company and the Subsidiaries
have been conducted only in the ordinary course consistent with past practice;
(iii) neither the Company nor any Subsidiary has incurred any material
liability, engaged in any material transaction, or entered into any material
agreement outside the ordinary course of business consistent with past practice;
(iv) neither the Company nor any Subsidiary has suffered any material loss,
damage, destruction, or other casualty to any of its assets (whether or not
covered by insurance); and (v) neither the Company nor any Subsidiary has taken
any of the actions set forth in Section 5.2 except as permitted thereunder.






                                        6
<PAGE>   8
         3.12  Tax Matters.  Except as disclosed on Schedule 3.12:

         (a) except in each case as could not be reasonably expected to have a
Material Adverse Effect, all Tax Returns have been or will be timely filed by
the Company and the Subsidiaries when due in accordance with all applicable
laws; all Taxes shown on such Tax Returns have been or will be timely paid when
due; such Tax Returns have been properly completed in compliance with all
applicable laws and regulations and completely and accurately reflect the facts
regarding the income, expenses, properties, business and operations required to
be shown thereon; such Tax Returns are not subject to penalties under Section
6662 of the Code (or any corresponding provision of state, local or foreign tax
law);

         (b) the Company and the Subsidiaries have paid all Taxes required to be
paid by them in all material respects (whether or not shown on a Tax Return) or
for which they could be liable (provided that it shall not be considered a
breach of this representation if it is ultimately determined that additional Tax
payments are due but such assessment is based on an adjustment to a return or
position, if such party has a reasonable basis for the position taken with
respect to such Taxes), whether to taxing authorities or to other persons under
Tax allocation agreements or otherwise, and the charges, accruals, and reserves
for Taxes due, or accrued but not yet due, relating to their income, properties,
transactions or operations as reflected on their books (including, without
limitation, the balance sheet included in the Company's Form 10-KSB for the
fiscal year ended December 31, 1998) are adequate to cover such Taxes;

         (c) there are no agreements or consents currently in effect for the
extension or waiver of the time (i) to file any Tax Return or (ii) for
assessment or collection of any Taxes relating to the income, properties or
operations of the Company or the Subsidiaries, nor has the Company or a
Subsidiary been requested to enter into any such agreement or consent; and

         (d) there are no liens for Taxes (other than for current Taxes not yet
due and payable) upon the assets of the Company or the Subsidiaries.

         3.13 Compliance With Laws. Except as disclosed on Schedule 3.13, the
Company and the Subsidiaries have complied in all material respects with all
Applicable Laws (including without limitation Applicable Laws relating to
securities, properties, business products and services, manufacturing processes,
advertising and sales practices, employment practices, terms and conditions of
employment, wages and hours, safety, occupational safety, health, environmental
protection, product safety, and civil rights). Neither the Company nor any
Subsidiary has received any written notice, which has not been dismissed or
otherwise disposed of, that the Company or any Subsidiary has not so complied.
Neither the Company nor any Subsidiary is charged or, to the best knowledge of
the Company, threatened with, or, to the best knowledge of the Company, under
investigation with respect to, any violation of any Applicable Law relating to
any aspect of the business of the Company or any Subsidiary.





                                        7
<PAGE>   9



         3.14 Legal Proceedings. There are no Proceedings pending or, to the
best knowledge of the Company, threatened against or involving the Company or
any Subsidiary (or any of their respective directors or officers in connection
with the business or affairs of the Company or any Subsidiary) or any properties
or rights of the Company or any Subsidiary, except (i) as disclosed on Schedule
3.14, (ii) for any Proceedings that pertain to routine claims by persons other
than Governmental Entities that are fully covered by insurance (subject to
applicable insurance deductibles), (iii) for minor product or service warranty
claims arising in the usual and ordinary course of business which in the
aggregate may be satisfied at nominal cost to the Company, and (iv) for
Proceedings which, individually or in the aggregate, if prosecuted to judgment,
would not have a Material Adverse Effect on the Company. Except as disclosed on
Schedule 3.14, any and all potential liability of the Company and the
Subsidiaries under such Proceedings is adequately covered (except for standard
deductible amounts) by the existing insurance maintained by the Company and the
Subsidiaries. Neither the Company nor any Subsidiary is subject to any judgment,
order, writ, injunction, or decree of any Governmental Entity which has had or
is reasonably likely to have a Material Adverse Effect on the Company. There are
no Proceedings pending or, to the best knowledge of the Company, threatened
seeking to restrain, prohibit, or obtain damages or other relief in connection
with this Agreement or the transactions contemplated hereby.

         3.15 Permits. The Company and the Subsidiaries hold all Permits
necessary or required for the conduct of the business of the Company and the
Subsidiaries as currently conducted, except where the failure to hold such
Permits could not reasonably be expected to have a Material Adverse Effect. Each
of such Permits is in full force and effect, the Company or such Subsidiary is
in compliance with all its obligations with respect thereto, and, to the best
knowledge of the Company, no event has occurred which permits, or with or
without the giving of notice or the passage of time or both would permit, the
revocation or termination of any thereof. Except as disclosed on Schedule 3.15,
no notice has been issued by any Governmental Entity and no Proceeding is
pending or, to the best knowledge of the Company, threatened with respect to any
alleged failure by the Company or a Subsidiary to have any Permit the absence of
which would have a Material Adverse Effect on the Company.

         3.16  Agreements.

         (a) Set forth on Schedule 3.16 is a list of all the following
agreements, arrangements, and understandings (written or oral, formal or
informal) (collectively, for purposes of this Section, "agreements") to which
the Company or any Subsidiary is a party or by which the Company or any
Subsidiary or any of their respective properties is otherwise bound:

                   (i) collective bargaining agreements and similar agreements
         with employees as a group;





                                        8
<PAGE>   10

                  (ii) employee benefit agreements, trusts, plans, funds, or
         other arrangements of any nature, including those referred to in
         Section 5.2(e)(i);

                 (iii) agreements with any current or former shareholder,
         director, officer, employee, consultant, or advisor or any affiliate of
         any such person;

                  (iv) agreements between or among the Company and any of the
         Subsidiaries;

                   (v) indentures, mortgages, security agreements, notes, loan
         or credit agreements, or other agreements relating to the borrowing of
         money by the Company or any Subsidiary or to the direct or indirect
         guarantee or assumption by the Company or any Subsidiary of any
         obligation of others, including any agreement (other than trade
         payables incurred in the ordinary course of business) that has the
         economic effect although not the legal form of any of the foregoing;

                  (vi) agreements relating to the acquisition or disposition of
         assets, other than those entered into in the ordinary course of
         business consistent with past practice;

                 (vii) agreements relating to the acquisition or disposition of
         any interest in any business enterprise;

                (viii) agreements containing any covenant limiting the freedom
         of the Company or any Subsidiary to engage in any line of business or
         compete with any other person in any geographic area or during any
         period of time;

                  (ix) joint venture agreements;

                   (x) contracts and other agreements under which the Company or
         any Subsidiary agrees to indemnify any party; and

                  (xi) other agreements, whether or not made in the ordinary
         course of business, that are material to the business, assets, results
         of operations, condition (financial or otherwise), or prospects of the
         Company and the Subsidiaries considered as a whole.

         (b) The Company has made available to Buyers accurate and complete
copies of the agreements listed on Schedule 3.16. Each of such agreements is a
valid and binding agreement of the Company and the Subsidiaries (to the extent
each is a party thereto) and (to the best knowledge of the Company) the other
party or parties thereto, enforceable against the Company and the Subsidiaries
(to the extent each is a party thereto) and (to the best knowledge of the
Company) such other party or parties in accordance with its terms. Neither the
Company nor any Subsidiary is in




                                        9
<PAGE>   11

breach of or in default under, nor has any event occurred which (with or without
the giving of notice or the passage of time or both) would constitute a default
by the Company or any Subsidiary under, any of such agreements, and neither the
Company nor any Subsidiary has received any notice from, or given any notice to,
any other party indicating that the Company or any Subsidiary is in breach of or
in default under any of such agreements, except in each case which could not be
reasonably expected to have a Material Adverse Effect. To the best knowledge of
the Company, no other party to any of such agreements is in breach of or in
default under such agreements, nor has any assertion been made by the Company or
any Subsidiary of any such breach or default.

         (c) Neither the Company nor any Subsidiary has received notice of any
plan or intention of any other party to any material agreement to exercise any
right of offset with respect to, or any right to cancel or terminate, any
material agreement. Neither the Company nor any Subsidiary currently
contemplates, or has reason to believe any other person currently contemplates,
any amendment or change to any agreement, which amendment or change could have a
Material Adverse Effect on the Company.

         3.17 ERISA. Other than a group health plan and a 401(k) plan, there is
no "employee benefit plan", as defined in Section 3(3) of ERISA, (i) which is
subject to any provision of ERISA, (ii) which is, or is required to be,
maintained, administered, or contributed to by the Company or any affiliate of
the Company, and (iii) which covers any employee or former employee of the
Company or any affiliate of the Company or under which the Company or any
affiliate of the Company has any liability. For purposes of this Section only,
an "affiliate" of any person means any other person which, together with such
person, would be treated as a single employer under Section 414 of the Code.

         3.18  Environmental Matters.

         (a)    Except as disclosed on Schedule 3.18:

                   (i) the properties, operations, and activities of the Company
         and the Subsidiaries comply with all Applicable Environmental Laws (as
         defined below), except for noncompliance that could not reasonably be
         expected to have a Material Adverse Effect;

                  (ii) the Company and the Subsidiaries and the properties,
         operations, and activities of the Company and the Subsidiaries are not
         subject to any existing, pending, or, to the best knowledge of the
         Company, threatened Proceeding under, or to any remedial obligations
         under, any Applicable Environmental Laws that could reasonably be
         expected to have a Material Adverse Effect;





                                       10
<PAGE>   12
                 (iii) all Permits, if any, required to be obtained by the
         Company or any Subsidiary under any Applicable Environmental Laws in
         connection with any aspect of the business of the Company or the
         Subsidiaries, including without limitation those relating to the
         treatment, storage, disposal, or release of a hazardous material (as
         defined below), have been duly obtained and are in full force and
         effect, and the Company and the Subsidiaries are in compliance with the
         material terms and conditions of all such Permits;

                  (iv) the Company and the Subsidiaries have satisfied and are
         currently in compliance with all financial responsibility requirements
         applicable to their respective operations and imposed by any
         Governmental Entity under any Applicable Environmental Laws, and the
         Company and the Subsidiaries have not received any notice of
         noncompliance with any such financial responsibility requirements;

                   (v) to the best knowledge of the Company, there are no
         physical or environmental conditions existing on any property owned or
         leased by the Company or any Subsidiary or resulting from the Company's
         or any Subsidiary's operations or activities, past or present, at any
         location, that would give rise to any on-site or off-site remedial
         obligations under any Applicable Environmental Laws, other than normal
         and ordinary remedial work associated with plugging and abandoning of
         oil and gas facilities;

                  (vi) to the best knowledge of the Company, since the effective
         date of the relative requirements of Applicable Environmental Laws, all
         hazardous materials generated by the Company or any Subsidiary or used
         in connection with their respective properties, operations, or
         activities have been transported only by carriers authorized under
         Applicable Environmental Laws to transport such materials, and have
         been disposed of only at treatment, storage, and disposal facilities
         authorized under Applicable Environmental Laws to treat, store, or
         dispose of such materials, and, to the best knowledge of the Company,
         such carriers and facilities, at the time of such transportation or
         disposal, were operating in compliance with such authorizations and
         were not the subject of any existing, pending, or threatened Proceeding
         in connection with any Applicable Environmental Laws;

                 (vii) since the effective date of the relative requirements of
         Applicable Environmental Laws, there has been no exposure of any person
         or property to hazardous materials, nor has there been any release of
         hazardous materials into the environment in violation of any Applicable
         Environmental Laws, by the Company or any Subsidiary or in connection
         with their respective properties, operations, or activities that could
         reasonably be expected to give rise to any claim for damages or
         compensation that could reasonably be expected to have a Material
         Adverse Effect; and





                                       11
<PAGE>   13
                (viii) the Company and the Subsidiaries shall make available to
         Buyers all internal and external environmental audits and studies and
         all correspondence on substantial environmental matters in the
         possession of the Company and the Subsidiaries relating to any of the
         current or former properties, operations, or activities of the Company
         and the Subsidiaries, provided that the Company and the Subsidiaries
         shall not be required to make available any such audits, studies, or
         correspondence that may be subject to the attorney-client privilege or
         similar privilege.

         (b) For purposes of this Agreement, "Applicable Environmental Laws"
means any and all Applicable Laws pertaining to health, safety, or the
environment in effect (currently or hereafter) in any and all jurisdictions in
which the Company or the Subsidiaries have conducted operations or activities or
owned or leased property, including, without limitation, the Clean Air Act, as
amended, the Comprehensive Environmental Response, Compensation and Liability
Act of 1980, as amended, the Rivers and Harbors Act of 1899, as amended, the
Federal Water Pollution Control Act, as amended, the Occupational Safety and
Health Act of 1970, as amended, the Resource Conservation and Recovery Act of
1976, as amended, the Safe Drinking Water Act, as amended, the Toxic Substances
Control Act, as amended, the Superfund Amendments and Reauthorization Act of
1986, as amended, the Hazardous Materials Transportation Act, as amended, the
Texas Water Code, the Texas Solid Waste Disposal Act, and other environmental
conservation or protection laws. For purposes of this Agreement, the term
"hazardous material" means any substance which is listed or defined as a
hazardous substance, hazardous constituent, or solid waste pursuant to any
Applicable Environmental Laws.

         (c) The representations and warranties contained in this Section would
continue to be true and correct following disclosure to the applicable
Governmental Entities of all relevant facts, conditions, and circumstances known
to the Company, if any, pertaining to the properties, operations, and activities
of the Company and the Subsidiaries.

         3.19  Oil and Gas Properties.

         (a) Each of the Company and the Subsidiaries has good and marketable
title to all of its material oil and gas properties and assets, free and clear
of all liens other than as disclosed in Schedule 3.19; provided, that no
representation or warranty is made with respect to any oil, gas or mineral
property or interest to which no proved oil or gas reserves are properly
attributed. All proceeds from the sale of each the Company's and the
Subsidiaries' share of the hydrocarbons being produced from its oil and gas
properties are currently being paid in full to such party by the purchasers
thereof on a timely basis and none of such proceeds are currently being held in
suspense by such purchaser or any other party.





                                       12
<PAGE>   14

         (b) The Company has delivered to Buyers a copy of the reserve report
(the "Reserve Report") dated as of January 1, 1999, prepared by T.J. Smith and
Company, Inc., independent reserve engineers (the "Reserve Engineers"), relating
to the oil and gas reserves of the Company and the Subsidiaries. The factual
information underlying the estimates of the reserves of the Company and the
Subsidiaries, which was supplied by the Company to the Reserve Engineers for the
purpose of preparing the Reserve Report, including, without limitation,
production, volumes, sales prices for production, contractual pricing provisions
under oil or gas sales or marketing contracts under hedging arrangements, costs
of operations and development, and working interest and net revenue information
relating to the Company's and the Subsidiaries' ownership interests in
properties, was true and correct in all material respects on the date of such
Reserve Report; the estimates of future capital expenditures and other future
exploration and development costs supplied to the Reserve Engineers were
prepared in good faith and with a reasonable basis; the information provided to
the Reserve Engineers for purposes of preparing the Reserve Report was prepared
in accordance with customary industry practices; the Reserve Engineers were, as
of the date of the Reserve Report prepared by it, and are, as of the date
hereof, independent petroleum engineers with respect to the Company and the
Subsidiaries; other than normal production of the reserves and intervening oil
and gas price fluctuations, the Company is not as of the date hereof and as of
the Closing Date will not be, aware of any facts or circumstances that would
result in a materially adverse change in the reserves in the aggregate, or the
aggregate present value of future net cash flows therefrom, as described in the
Reserve Report; estimates of such reserves and the present value of the future
net cash flows therefrom in the Reserve Report comply in all material respects
to the applicable requirements of Regulation S-X and Industry Guide 2 under the
Securities Act.

         3.20 Nature of Company Assets. The assets of the Company and of the
Subsidiaries consist solely of (i) reserves of oil, rights to reserves of oil
and associated exploration and production assets with a fair market value not
exceeding $500 million and (ii) other assets with a fair market value not
exceeding $15 million. For purposes of this Section 3.20, the term "associated
exploration and production assets" shall have the meaning ascribed thereto in
Section 802.3 of the Rules promulgated pursuant to the Hart-Scott-Rodino
Antitrust Improvements Act of 1976.

         3.21 Marketing of Production. Except for contracts listed on Schedule
3.21 (with respect to all of which contracts the Company represents that it or
its affiliates are receiving a price for all production sold thereunder which is
computed in accordance with the terms of the relevant contract and are not
having deliveries curtailed substantially below the subject property's delivery
capacity), there exist no material agreements for the sale of production from
the leasehold and other interests in oil, gas and other mineral properties
owned, or otherwise held in the name of, the Company or its affiliates
(collectively, the "Oil and Gas Properties") (including without limitation,
calls on, or other rights to purchase, production, whether or not the same are
currently being exercised) other than (i) agreements or arrangements pertaining
to the sale of production at a price equal to or greater than a price that is
the market price from time to time existing in the areas where the Oil and Gas




                                       13
<PAGE>   15

Properties subject to such agreement or arrangement are located, and (ii)
agreements or arrangements that are cancelable on 90 days notice or less without
penalty or detriment.

         3.22 Material Personal Property. All pipelines, wells, gas processing
plants, platforms and other material improvements, fixtures and equipment owned
in whole or in part by the Company or any of its affiliates that are necessary
to conduct normal operations are being maintained in a state adequate to conduct
normal operations, and with respect to such of the foregoing which are operated
by the Company or any of its affiliates, in a manner consistent with the
Company's or its affiliates' past practices.

         3.23 Intellectual Property. The Company and its affiliates either own
or have valid licenses or other rights to use all patents, copyrights,
trademarks, software, databases, geological data, geophysical data, engineering
data, maps, interpretations and other technical information used in their
businesses as presently conducted, subject to the limitations contained in the
agreements governing the use of the same, which limitations are customary for
companies engaged in the business of the exploration and production of oil, gas,
condensate and other hydrocarbons, with such exceptions as would not result in a
Material Adverse Effect on the Company. There are no limitations contained in
the agreements of the type described in the immediately preceding sentence
which, upon consummation of the transactions contemplated by this Agreement,
will alter or impair any such rights, breach any such agreement with any third
party vendor, or require payments of additional sums thereunder, except any such
limitations that would not have a Material Adverse Effect on the Company. The
Company and its affiliates are in compliance in all material respects with such
licenses and agreements and there are no pending or, to the best knowledge of
the Company, threatened Proceedings challenging or questioning the validity or
effectiveness of any license or agreement relating to such property or the right
of the Company or any affiliate to use, copy, modify or distribute the same.

         3.24 Brokerage Fees. Neither the Company nor any of its affiliates has
retained any financial advisor, broker, agent, or finder or paid or agreed to
pay any financial advisor, broker, agent, or finder on account of this Agreement
or any transaction contemplated hereby. The Company shall indemnify and hold
harmless Buyers from and against any and all losses, claims, damages, and
liabilities (including legal and other expenses reasonably incurred in
connection with investigating or defending any claims or actions) with respect
to any finder's fee, brokerage commission, or similar payment in connection with
any transaction contemplated hereby asserted by any person on the basis of any
act or statement made or alleged to have been made by the Company or any of its
affiliates.

         3.25 Disclosure. No representation or warranty made by the Company in
this Agreement, and no statement of the Company contained in any document,
certificate, or other writing furnished or to be furnished by the Company
pursuant hereto or in connection herewith, contains or will




                                       14
<PAGE>   16
contain, at the time of delivery, any untrue statement of a material fact or
omits or will omit, at the time of delivery, to state any material fact
necessary in order to make the statements contained therein, in light of the
circumstances under which they are made, not misleading. The Company knows of no
matter (other than matters of a general economic character, including commodity
prices, not relating solely to the Company or any Subsidiary in any specific
manner) which has not been disclosed to Buyers pursuant to this Agreement which
has or is reasonably likely to have a Material Adverse Effect on the Company.
The Company has delivered or made available to Buyers accurate and complete
copies of all agreements, documents, and other writings referred to or listed in
this Article III or any Schedule hereto.

         3.26 Representations and Warranties on Closing Date. The
representations and warranties made in this Article III will be true and correct
in all material respects on and as of the Closing Date with the same force and
effect as if such representations and warranties had been made on and as of the
Closing Date, except that any such representations and warranties which
expressly relate only to an earlier date shall be true and correct on the
Closing Date as of such earlier date.

                                   ARTICLE IV.

                    REPRESENTATIONS AND WARRANTIES OF BUYERS

         Each Buyer, only with respect to itself, represents and warrants to the
Company that:

         4.1 Organization and Formation. Each corporate Buyer is duly organized,
validly existing, and in good standing under the laws of the jurisdiction of its
incorporation and has all requisite corporate power and corporate authority to
own, lease, and operate its properties and to carry on its business as now being
conducted. Each partnership Buyer is duly formed and is in good standing (as
applicable) under the laws of the jurisdiction of its formation. No actions or
proceedings to dissolve any Buyer are pending or, to the best knowledge of
Buyers, threatened.

         4.2 Authority Relative to This Agreement. Each Buyer has full power and
authority to execute, deliver, and perform this Agreement and the Ancillary
Documents to which it is a party and to consummate the transactions contemplated
hereby and thereby. The execution, delivery, and performance by Buyers of this
Agreement and the Ancillary Documents to which they are parties, and the
consummation by them of the transactions contemplated hereby and thereby, have
been duly authorized by all necessary corporate or partnership action, as
applicable, of Buyers. This Agreement has been duly executed and delivered by
Buyers and constitutes, and each Ancillary Document executed or to be executed
by Buyers has been, or when executed will be, duly executed and delivered by
each Buyer and constitute, or when executed and delivered will constitute, valid
and legally binding obligations of each Buyer, enforceable against each Buyer in
accordance with




                                       15
<PAGE>   17
their respective terms, except that such enforceability may be limited by (i)
applicable bankruptcy, insolvency, reorganization, moratorium, and similar laws
affecting creditors' rights generally and (ii) equitable principles which may
limit the availability of certain equitable remedies (such as specific
performance) in certain instances.

         4.3 Noncontravention. The execution, delivery, and performance by
Buyers of this Agreement and the Ancillary Documents to which they are parties
and the consummation by them of the transactions contemplated hereby and thereby
do not and will not (i) conflict with or result in a violation of any provision
of the charter or bylaws (or other governing documents), as applicable, of
Buyers, (ii) conflict with or result in a violation of any provision of, or
constitute (with or without the giving of notice or the passage of time or both)
a default under, or give rise (with or without the giving of notice or the
passage of time or both) to any right of termination, cancellation, or
acceleration under, or require any consent, approval, authorization, or waiver
of any party to, any bond, debenture, note, mortgage, indenture, lease,
contract, agreement, or other instrument or obligation to which any Buyer is a
party or by which any Buyer or any of its properties may be bound or any Permit
held by a Buyer, (iii) result in the creation or imposition of any Encumbrance
upon the properties of Buyers, or (iv) violate any Applicable Law binding upon
Buyers, except, in the case of clauses (ii), (iii), and (iv) above, for any such
conflicts, violations, defaults, terminations, cancellations, accelerations, or
Encumbrances which would not, individually or in the aggregate, have a Material
Adverse Effect on such Buyer or on the ability of such Buyer to consummate the
transactions contemplated hereby.

         4.4 Governmental Approvals. No consent, approval, order, or
authorization of, or declaration, filing, or registration with, any Governmental
Entity is required to be obtained or made by any Buyer in connection with the
execution, delivery, or performance by Buyers of this Agreement and the
Ancillary Documents to which they are parties or the consummation by them of the
transactions contemplated hereby or thereby, other than as set forth on Schedule
4.4 or in the Small Business Sideletter (defined in Section 6.17 hereof).

         4.5 Financing. Each Buyer has, and at the Closing will have, such funds
as are necessary for the consummation by it of the transactions contemplated
hereby.

         4.6 Disclosure of Information. Buyers represent that they have had an
opportunity to ask questions of and receive answers from the Company regarding
the Company and its business, assets, results of operation, and financial
condition and the terms and conditions of the issuance of the Shares. Each Buyer
further represents that it has access to all filings duly made by the Company
with the Securities and Exchange Commission since January 1, 1998. The
foregoing, however, shall not limit or modify the representations and warranties
of the Company in Article III, shall not limit the rights of Buyers prior to and
in anticipation of any issuance of the Shares pursuant hereto, and shall not
limit the disclosure requirements of applicable federal and state securities
laws.




                                       16
<PAGE>   18



         4.7 Investment Experience. Each Buyer acknowledges that it can bear the
economic risk of its investment in the Shares, and has such knowledge and
experience in financial and business matters that it is capable of evaluating
the merits and risks of an investment in the Shares.

         4.8 Restricted Securities. Each Buyer understands that the Shares will
not have been registered pursuant to the Securities Act or any applicable state
securities laws, that the Shares will be characterized as "restricted
securities" under federal securities laws, and that under such laws and
applicable regulations the Shares cannot be sold or otherwise disposed of
without registration under the Securities Act or an exemption therefrom. In this
connection, each Buyer represents that it is familiar with Rule 144 promulgated
under the Securities Act, as currently in effect, and understands the resale
limitations imposed thereby and by the Securities Act. Appropriate stop transfer
instructions may be issued to the transfer agent for securities of the Company
(or a notation may be made in the appropriate records of the Company) in
connection with the Shares.

         4.9 Legend. It is agreed and understood by Buyers that the certificates
representing the Shares shall each conspicuously set forth on the face or back
thereof, in addition to any legends required by Applicable Law or other
agreement, a legend in substantially the following form:

         THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
         PURSUANT TO THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY STATE
         SECURITIES LAWS. SUCH SHARES MAY NOT BE SOLD OR OTHERWISE TRANSFERRED
         UNLESS THEY ARE FIRST REGISTERED PURSUANT TO THAT ACT AND APPLICABLE
         STATE SECURITIES LAWS OR UNLESS THE CORPORATION RECEIVES A WRITTEN
         OPINION OF COUNSEL, WHICH OPINION AND COUNSEL ARE SATISFACTORY TO THE
         CORPORATION, TO THE EFFECT THAT SUCH REGISTRATION IS NOT REQUIRED.

         4.10 Accredited Investor; Investment Intent. Each Buyer is an
accredited investor as defined in Regulation D under the Securities Act. Each
Buyer is acquiring its portion of the Shares for its own account for investment
and not with a view to, or for sale or other disposition in connection with, any
distribution of all or any part thereof, except in compliance with applicable
federal and state securities laws.

         4.11 Legal Proceedings. There are no Proceedings pending or, to the
best knowledge of Buyers, threatened seeking to restrain, prohibit, or obtain
damages or other relief in connection with this Agreement or the transactions
contemplated hereby.

         4.12 Brokerage Fees. No Buyer nor any of Buyers' affiliates has
retained any financial advisor, broker, agent, or finder or paid or agreed to
pay any financial advisor, broker, agent, or finder on account of this Agreement
or any transaction contemplated hereby. Buyers shall indemnify




                                       17
<PAGE>   19
and hold harmless the Company from and against any and all losses, claims,
damages, and liabilities (including legal and other expenses reasonably incurred
in connection with investigating or defending any claims or actions) with
respect to any finder's fee, brokerage commission, or similar payment in
connection with any transaction contemplated hereby asserted by any person on
the basis of any act or statement made or alleged to have been made by Buyers or
any of their affiliates.

         4.13 Disclosure. No representation or warranty made by Buyers in this
Agreement, and no statement of Buyers contained in any document, certificate, or
other writing furnished or to be furnished by Buyers pursuant hereto or in
connection herewith, contains or will contain, at the time of delivery, any
untrue statement of a material fact or omits, or will omit, at the time of
delivery, to state any material fact necessary in order to make the statements
contained therein, in the light of the circumstances under which they are made,
not misleading.

         4.14 Representations and Warranties on Closing Date. The
representations and warranties made in this Article IV will be true and correct
in all material respects on and as of the Closing Date with the same force and
effect as if such representations and warranties had been made on and as of the
Closing Date, except that any such representations and warranties which
expressly relate only to an earlier date shall be true and correct on the
Closing Date as of such earlier date.

                                   ARTICLE V.

                       CONDUCT OF COMPANY PENDING CLOSING

         The Company hereby covenants and agrees with Buyers as follows:

         5.1 Conduct and Preservation of Business. Except as expressly provided
in this Agreement, during the period from the date hereof to the Closing, the
Company and the Subsidiaries (i) shall each conduct its operations according to
its ordinary course of business consistent with past practice and in compliance
with all Applicable Laws; (ii) shall each use its reasonable best efforts to
preserve, maintain, and protect its properties; and (iii) shall each use its
reasonable best efforts to preserve intact its business organization, to keep
available the services of its officers and employees, and to maintain existing
relationships with licensors, licensees, suppliers, contractors, distributors,
customers, and others having business relationships with it.

         5.2 Restrictions on Certain Actions. Without limiting the generality of
the foregoing, and except as otherwise expressly provided in this Agreement,
prior to the Closing, neither the Company nor any Subsidiary shall, without the
prior written consent of Buyer:

                   (a) amend its charter or bylaws;





                                       18
<PAGE>   20



                   (b) (i) issue, sell, or deliver (whether through the issuance
         or granting of options, warrants, commitments, subscriptions, rights to
         purchase, or otherwise) any shares of its capital stock of any class or
         any other securities or equity equivalents; or (ii) amend in any
         respect any of the terms of any such securities outstanding as of the
         date hereof;

                   (c) (i) split, combine, or reclassify any shares of its
         capital stock; (ii) declare, set aside, or pay any dividend or other
         distribution (whether in cash, stock, or property or any combination
         thereof) in respect of its capital stock; (iii) repurchase, redeem, or
         otherwise acquire any of its securities or any securities of any
         Subsidiary; or (iv) adopt a plan of complete or partial liquidation or
         resolutions providing for or authorizing a liquidation, dissolution,
         merger, consolidation, conversion, restructuring, recapitalization, or
         other reorganization of the Company or any Subsidiary;

                   (d) (i) except in the ordinary course of business consistent
         with past practice, create, incur, guarantee, or assume any
         indebtedness for borrowed money or otherwise become liable or
         responsible for the obligations of any other person; (ii) make any
         loans, advances, or capital contributions to, or investments in, any
         other person (other than to wholly owned Subsidiaries); (iii) pledge or
         otherwise encumber shares of capital stock of the Company or any
         Subsidiary; or (iv) except in the ordinary course of business
         consistent with past practice, mortgage or pledge any of its assets,
         tangible or intangible, or create or suffer to exist any lien
         thereupon; provided, however, that in no event shall the Company and
         the Subsidiaries (A) incur incremental indebtedness in excess of
         $100,000 in the aggregate or (B) incur incremental indebtedness which
         is not prepayable at any time without penalty or premium;

                   (e) (i) enter into, adopt, or (except as may be required by
         law) amend or terminate any bonus, profit sharing, compensation,
         severance, termination, stock option, stock appreciation right,
         restricted stock, performance unit, stock equivalent, stock purchase,
         pension, retirement, deferred compensation, employment, severance, or
         other employee benefit agreement, trust, plan, fund, or other
         arrangement for the benefit or welfare of any director, officer, or
         employee; (ii) except for normal increases in the ordinary course of
         business consistent with past practice that, in the aggregate, do not
         result in a material increase in benefits or compensation expense to
         the Company, increase in any manner the compensation or fringe benefits
         of any director, officer, or employee; or (iii) pay to any director,
         officer, or employee any benefit not required by any employee benefit
         agreement, trust, plan, fund, or other arrangement as in effect on the
         date hereof;

                   (f) acquire, sell, lease, transfer, or otherwise dispose of,
         directly or indirectly, any assets outside the ordinary course of
         business consistent with past practice or any assets that in the
         aggregate are material to the Company and the Subsidiaries considered
         as a whole;





                                       19
<PAGE>   21
                   (g) acquire (by merger, consolidation, or acquisition of
         stock or assets or otherwise) any corporation, partnership, or other
         business organization or division thereof;

                   (h) make any capital expenditure or expenditures which,
         individually, is in excess of $100,000 or, in the aggregate, are in
         excess of $250,000

                   (i) amend any Tax Return or make any Tax election or settle
         or compromise any federal, state, local, or foreign Tax liability
         material to the Company and the Subsidiaries considered as a whole;

                   (j) pay, discharge, or satisfy any claims, liabilities, or
         obligations (whether accrued, absolute, contingent, unliquidated, or
         otherwise, and whether asserted or unasserted), other than the payment,
         discharge, or satisfaction in the ordinary course of business
         consistent with past practice, or in accordance with their terms, of
         liabilities reflected or reserved against in the Financial Statements
         or incurred since January 1, 1999 in the ordinary course of business
         consistent with past practice; provided, however, that in no event
         shall the Company or any Subsidiary repay any long-term indebtedness
         except to the extent required by the terms thereof;

                   (k) enter into any lease, contract, agreement, commitment,
         arrangement, or transaction outside the ordinary course of business
         consistent with past practice;

                   (l) amend, modify, or change in any material respect any
         existing lease, contract, or agreement, other than in the ordinary
         course of business consistent with past practice;

                   (m) waive, release, grant, or transfer any rights of value,
         other than in the ordinary course of business consistent with past
         practice;

                   (n) change any of the accounting principles or practices used
         by it, except for any change required by reason of a concurrent change
         in generally accepted accounting principles and notice of which is
         given in writing by the Company to Buyers;

                   (o) take any action which would or might make any of the
         representations or warranties of the Company contained in this
         Agreement untrue or inaccurate as of any time from the date of this
         Agreement to the Closing or would or might result in any of the
         conditions set forth in this Agreement not being satisfied; or

                   (p) authorize or propose, or agree in writing or otherwise to
         take, any of the actions described in this Section.





                                       20
<PAGE>   22
                                   ARTICLE VI.

                              ADDITIONAL AGREEMENTS

         6.1  Access to Information; Confidentiality.

         (a) Between the date hereof and the Closing, the Company: (i) shall
give Buyers and their authorized representatives reasonable access to all
employees, all plants, offices, warehouses, and other facilities, and all books
and records, including work papers and other materials prepared by the Company's
independent public accountants, of the Company and the Subsidiaries, (ii) shall
permit Buyers and their authorized representatives to make inspections as they
may reasonably require, and (iii) shall cause the Company's officers and those
of the Subsidiaries to furnish Buyers and their authorized representatives with
such financial and operating data and other information with respect to the
Company and the Subsidiaries as Buyers may from time to time reasonably request;
provided, however, that no investigation pursuant to this Section shall affect
any representation or warranty of the Company contained in this Agreement or in
any agreement, instrument, or document delivered pursuant hereto or in
connection herewith; and provided further that the Company shall have the right
to have a representative present at all times of any such inspections,
interviews, and examinations conducted at or on the offices or other facilities
or properties of the Company or its affiliates or representatives.

         From time to time following the Closing the Company shall, after
receiving not less than two (2) business days' notice from a Buyer, allow such
Buyer and its authorized representatives (i) access to all books and records,
including work papers and other materials prepared by the Company's independent
public accountants, of the Company and the Subsidiaries, (ii) to make
inspections of the facilities and assets of the Company and the Subsidiaries,
and (iii) to receive other financial and operating data and other information
with respect to the Company and the Subsidiaries as such Buyer may from time to
time reasonably request. The Company shall have no obligations to a Buyer under
the immediately preceding sentence in the event that such Buyer has sold at
least fifty percent (50%) of the shares of Common Stock purchased by such Buyer
on the Closing Date.

         (b) Buyers agree that all Confidential Information (as defined below)
shall be kept confidential by Buyers and shall not be disclosed by Buyers in any
manner whatsoever; provided, however, that (i) any of such Confidential
Information may be disclosed to such directors, officers, employees, and
authorized representatives (including without limitation attorneys, accountants,
consultants, bankers, and financial advisors) of Buyers (collectively, for
purposes of this Section, "Buyer Representatives") as need to know such
information for the purpose of evaluating the transactions contemplated hereby,
(ii) any disclosure of Confidential Information may be made to the extent to
which the Company consents in writing, and (iii) Confidential Information may be
disclosed by a Buyer or any Buyer Representative to the extent that a Buyer or
Buyer Representative is legally compelled to do so, provided that, prior to
making such disclosure, such Buyer or Buyer




                                       21
<PAGE>   23
Representative, as the case may be, advises and consults with the Company
regarding such disclosure and provided further that such Buyer or Buyer
Representative, as the case may be, discloses only that portion of the
Confidential Information as is legally required. Buyers agree that none of the
Confidential Information will be used for any purpose other than in connection
with the transactions contemplated hereby. The term "Confidential Information,"
as used herein, means all information (irrespective of the form of
communication) obtained by or on behalf of Buyers from the Company or their
representatives pursuant to this Section and all similar information obtained
from the Company or their representatives by or on behalf of Buyers prior to the
date of this Agreement, other than information which (i) was or becomes
generally available to the public other than as a result of disclosure by Buyers
or any Buyer Representative, (ii) was or becomes available to Buyers on a
nonconfidential basis from a person other than the Company or its
representatives prior to disclosure to Buyers by the Company or its
representatives, or (iii) was or becomes available to Buyers from a source other
than the Company and its representatives, provided that such source is not known
by Buyers to be bound by a confidentiality agreement with the Company.

         6.2 Mandatory Redemption. At the time, if any, that Tim Goff ceases to
serve (for a period of 30 consecutive days or more) as the Chief Executive
Officer of the Company while any shares of Preferred Stock are held by a Buyer,
there shall be a mandatory redemption of the outstanding shares of Preferred
Stock held by all Buyers, in accordance with Section 6(a) (or a successor
thereto) of the Certificate of Designations establishing the Preferred Stock.

         6.3 Third Party Consents. The Company shall use its reasonable best
efforts to obtain all consents, approvals, orders, authorizations, and waivers
of, and to effect all declarations, filings, and registrations with, all third
parties (including Governmental Entities) that are necessary, required, or
deemed by Buyers to be desirable to enable the Company to issue the Shares to
Buyers as contemplated by this Agreement and to otherwise consummate the
transactions contemplated hereby. All costs and expenses of obtaining or
effecting any and all of the consents, approvals, orders, authorizations,
waivers, declarations, filings, and registrations referred to in this Section
shall be borne by the Company.

         6.4 Reasonable Best Efforts. Each party hereto agrees that it will not
voluntarily undertake any course of action inconsistent with the provisions or
intent of this Agreement and will use its reasonable best efforts to take, or
cause to be taken, all action and to do, or cause to be done, all things
reasonably necessary, proper, or advisable under Applicable Laws to consummate
the transactions contemplated by this Agreement, including, without limitation,
(i) cooperation in determining whether any consents, approvals, orders,
authorizations, waivers, declarations, filings, or registrations of or with any
Governmental Entity or third party are required in connection with the
consummation of the transactions contemplated hereby; (ii) reasonable best
efforts to obtain any such consents, approvals, orders, authorizations, and
waivers and to effect any such declarations, filings, and registrations; (iii)
reasonable best efforts to cause to be lifted or rescinded any injunction or
restraining order or other order adversely affecting the ability of the parties
to consummate the transactions contemplated hereby; (iv) reasonable best efforts
to defend, and cooperation in




                                       22
<PAGE>   24



defending, all lawsuits or other legal proceedings challenging this Agreement or
the consummation of the transactions contemplated hereby; and (v) the execution
of any additional instruments necessary to consummate the transactions
contemplated hereby.

         6.5 Registration Rights Agreement. The Company and Buyers shall enter
into an amended and restated registration rights agreement (the "Registration
Agreement") at (and subject to the occurrence of) the Closing pursuant to which
the Company shall agree to register under the Securities Act securities owned by
Buyers. The Registration Agreement shall be in substantially the form set forth
as Exhibit 6.5.

         6.6 Shareholders' Agreement. The Company and Buyers shall enter into an
amended and restated shareholders' agreement (the "Shareholders' Agreement") at
(and subject to the occurrence of) the Closing, substantially in the form set
forth as Exhibit 6.6.

         6.7 Option Plan. The Company shall adopt an option plan (the "Option
Plan") at (and subject to the occurrence of) the Closing, providing for option
grants thereunder to each individual listed on Schedule 6.7(a). The Option Plan
shall be in substantially the form set forth as Exhibit 6.7(b). The Company
shall submit the Option Plan to its shareholders for approval at its next annual
meeting of shareholders.

         6.8 Public Announcements. Except as may be required by Applicable Law
or this Section 6.8, no Buyer, on the one hand, or the Company, on the other,
shall issue any press release or otherwise make any public statement with
respect to this Agreement or the transactions contemplated hereby without the
prior written consent of the other parties (which consent shall not be
unreasonably withheld). Any such press release or public statement required by
Applicable Law shall only be made after reasonable notice to the other parties.
Upon execution of this Agreement, the Company shall make a press release in the
form of Exhibit 6.8 and promptly file a report on Form 8-K with the Securities
and Exchange Commission.

         6.9 Notice of Litigation. Until the Closing, (i) Buyers, upon learning
of the same, shall promptly notify the Company of any Proceeding which is
commenced or threatened against a Buyer and which affects this Agreement or the
transactions contemplated hereby and (ii) the Company, upon learning of the
same, shall promptly notify Buyers of any Proceeding which is commenced or
threatened against the Company and which affects this Agreement or the
transactions contemplated hereby and any Proceeding which is commenced or
threatened against the Company or any Subsidiary and which would have been
listed on Schedule 3.14 if such Proceeding had arisen prior to the date hereof.

         6.10 Notification of Certain Matters. The Company shall give prompt
notice to Buyers of: (i) the occurrence or nonoccurrence of any event the
occurrence or nonoccurrence of which would be likely to cause any representation
or warranty contained in Article III to be untrue or inaccurate at or prior to
the Closing, (ii) any failure of the Company to comply with or satisfy any
covenant,




                                       23
<PAGE>   25

condition, or agreement to be complied with or satisfied by the Company
hereunder, and (iii) any notice or other communication from any person alleging
that the consent or approval of such person is or may be required in connection
with the transactions contemplated by this Agreement (other than those consents
and approvals indicated as required on Schedule 3.6). Buyers shall give prompt
notice to the Company of: (i) the occurrence or nonoccurrence of any event the
occurrence or nonoccurrence of which would be likely to cause any representation
or warranty contained in Article IV to be untrue or inaccurate at or prior to
the Closing, and (ii) any failure of Buyers to comply with or satisfy any
covenant, condition, or agreement to be complied with or satisfied by such
person hereunder. The delivery of any notice pursuant to this Section shall not
be deemed to: (i) modify the representations or warranties hereunder of the
party delivering such notice, (ii) modify the conditions set forth in Articles
VII and VIII, or (iii) limit or otherwise affect the remedies available
hereunder to the party receiving such notice.

         6.11 Amendment of Schedules. Each party hereto agrees that, with
respect to the representations and warranties of such party contained in this
Agreement, such party shall have the continuing obligation until the Closing to
supplement or amend promptly the Schedules hereto with respect to any matter
hereafter arising or discovered which, if existing or known at the date of this
Agreement, would have been required to be set forth or described in the
Schedules. For all purposes of this Agreement, including without limitation for
purposes of determining whether the conditions set forth in Sections 7.1 and 8.1
have been fulfilled, the Schedules hereto shall be deemed to include only that
information contained therein on the date of this Agreement and shall be deemed
to exclude all information contained in any supplement or amendment thereto.

         6.12  Fees and Expenses.

         (a) The Company shall, promptly after receiving a billing statement
regarding same but no earlier than at the closing, pay all reasonable fees and
expenses (including without limitation for legal counsel and accounting fees) of
Buyers as incurred in connection with the negotiation and preparation of this
Agreement and the Ancillary Documents and in connection with the transactions
contemplated hereby and thereby.

         (b) The Company shall be responsible for the payment of all of the
Company's fees and expenses incurred in connection with this Agreement and the
transactions contemplated hereby.

         (c) In addition to the foregoing, at (and conditioned upon) the
Closing, the Company shall pay in cash to Buyers a financing fee of One Million
Five Hundred Thousand Dollars ($1,500,000), which shall be allocated among the
Buyers pro rata in accordance with the number of shares of Preferred Stock
purchased hereunder.

         6.13 Transfer Taxes. All sales, transfer, filing, recordation,
registration, stamp, and similar Taxes and fees arising from or associated with
the sale and transfer of the Shares as contemplated hereunder, whether levied on
Buyers or the Company, shall be borne by the Company and the




                                       24
<PAGE>   26
Company shall file all necessary documentation with respect to, and make all
payments of, such Taxes and fees on a timely basis.

         6.14 Certificate of Designations. No later than the Closing, the
Company shall file with the Texas Secretary of State a Certificate of
Designations in the form of Exhibit 6.14.

         6.15 Bylaw Amendment. No later than the Closing, the Company shall duly
adopt an amendment to its Bylaws regarding requisite approval of Directors, in
the form of Exhibit 6.15.

         6.16 Noncompetition Agreement. The Company and Tim J. Goff shall enter
into a Confidentiality and Non-Compete Agreement (the "Non-Compete Agreement")
at (and subject to the occurrence of) the Closing, substantially in the form set
forth as Exhibit 6.16.

         6.17 Certain Regulatory Matters.

         (a) Each Buyer agrees to cooperate with the Company in all reasonable
respects in complying with the terms and provisions of the letter agreement
between the Company and EOS, BACI and SGCP, a copy of which is attached hereto
as Exhibit 6.17, regarding small business matters (the "Small Business
Sideletter"), including without limitation, voting to approve amending the
Company's Articles of Incorporation, the Company's by-laws or this Agreement in
a manner reasonably acceptable to the Buyers or any "Regulated Holder" (as
defined in the Small Business Sideletter) entitled to make such request pursuant
to the Small Business Sideletter in order to remedy a "Regulatory Problem" (as
defined in the Small Business Sideletter). Anything contained in this Section
6.17 to the contrary notwithstanding, no Buyer shall be required under this
Section 6.17 to take any action that would adversely affect in any material
respect such Buyer's rights under this Agreement, the Ancillary Documents, or
otherwise as a shareholder of the Company.

         (b) The Company and each Buyer agree not to amend or waive the voting
or other provisions of the Company's Articles of Incorporation, the Company's
by-laws or this Agreement if such amendment or waiver would cause any "Regulated
Holder" to have a "Regulatory Problem" (as such terms are defined in the Small
Business Sideletter). Each of EOS, BACI and SGCP agrees to notify the Company as
to whether or not it would have any such Regulatory Problem promptly after such
party has notice of such amendment or waiver.

         6.18 Survival of Covenants. Except for any covenant or agreement which
by its terms expressly terminates as of a specific date or event, the covenants
and agreements of the parties hereto contained in this Agreement shall survive
the Closing without contractual limitation.






                                       25
<PAGE>   27
                                  ARTICLE VII.

                    CONDITIONS TO OBLIGATIONS OF THE COMPANY

         The obligations of the Company to consummate the transactions
contemplated by this Agreement shall be subject to the fulfillment on or prior
to the Closing Date of each of the following conditions:

         7.1 Representations and Warranties True. All the representations and
warranties of Buyers contained in this Agreement, and in any agreement,
instrument, or document delivered pursuant hereto or in connection herewith on
or prior to the Closing Date, shall be true and correct in all material respects
as of the date made and (having been deemed to have been made again on and as of
the Closing Date in the same language) shall be true and correct in all material
respects on and as of the Closing Date, except as affected by transactions
permitted by this Agreement and except to the extent that any such
representation or warranty is made as of a specified date, in which case such
representation or warranty shall have been true and correct in all material
respects as of such specified date.

         7.2 Covenants and Agreements Performed. Buyers shall have performed and
complied with in all material respects all covenants and agreements required by
this Agreement to be performed or complied with by them on or prior to the
Closing Date.

         7.3 Certificate. The Company shall have received a certificate executed
by each Buyer dated the Closing Date, representing and certifying, in such
detail as the Company may reasonably request, that the conditions set forth in
Sections 7.1 and 7.2 have been fulfilled and that such Buyer is not in breach of
any provision of this Agreement.

         7.4 Legal Proceedings. No Proceeding shall, on the Closing Date, be
pending or threatened seeking to restrain, prohibit, or obtain damages or other
relief in connection with this Agreement or the consummation of the transactions
contemplated hereby.

                                  ARTICLE VIII.

                       CONDITIONS TO OBLIGATIONS OF BUYERS

         The obligations of Buyers to consummate the transactions contemplated
by this Agreement shall be subject to the fulfillment on or prior to the Closing
Date of each of the following conditions:

         8.1 Representations and Warranties True. All the representations and
warranties of the Company contained in this Agreement, and in any agreement,
instrument, or document delivered pursuant hereto or in connection herewith on
or prior to the Closing Date, shall be true and correct




                                       26
<PAGE>   28
in all material respects as of the date made and (having been deemed to have
been made again on and as of the Closing Date in the same language) shall be
true and correct in all material respects on and as of the Closing Date, except
as affected by transactions permitted by this Agreement and except to the extent
that any such representation or warranty is made as of a specified date, in
which case such representation or warranty shall have been true and correct in
all material respects as of such specified date.

         8.2 Covenants and Agreements Performed. The Company shall have
performed and complied with in all material respects all covenants and
agreements required by this Agreement to be performed or complied with by it on
or prior to the Closing Date.

         8.3 Certificate. Buyers shall have received a certificate executed on
behalf of the Company by the chief executive officer and by the chief financial
officer of the Company, dated the Closing Date, representing and certifying, in
such detail as Buyers may reasonably request, that the conditions set forth in
Sections 8.1 and 8.2 have been fulfilled and that the Company is not in breach
of any provision of this Agreement.

         8.4 Opinion of Counsel. Buyers shall have received an opinion of Butler
& Binion, L.L.P., legal counsel to the Company, dated the Closing Date,
substantially in the form of Exhibit 8.4. In rendering such opinion, such
counsel may rely as to factual matters upon certificates or other documents
furnished by directors and officers of the Company and by government officials
and upon such other documents and data as such counsel deems appropriate as a
basis for such opinion.

         8.5 Legal Proceedings. No Proceeding shall, on the Closing Date, be
pending or threatened seeking to restrain, prohibit, or obtain damages or other
relief in connection with this Agreement or the consummation of the transactions
contemplated hereby.

         8.6 Consents.

         (a) There shall have been obtained any and all material permits,
consents, and approvals of Governmental Entities that reasonably may be deemed
necessary so that the consummation of the transactions contemplated hereby will
be in compliance with Applicable Law, the failure to comply with which would
have a Material Adverse Effect on the Company.

         (b) All consents and approvals of private persons, (i) the granting of
which is necessary for the consummation of the transactions contemplated hereby
and (ii) the non-receipt of which would have a Material Adverse Effect on the
Company, shall have been obtained.

         8.7 No Material Adverse Change. Since the date of this Agreement, there
shall not have been any material adverse change in the business, assets, results
of operations, condition (financial or otherwise), or prospects of the Company
and the Subsidiaries considered as a whole.





                                       27
<PAGE>   29
         8.8 Due Diligence. The due diligence conducted by Buyers and their
representatives in connection with the proposed transactions contemplated hereby
shall not have caused Buyers or their representatives to become aware of any
facts relating to the business, assets, results of operations, condition
(financial or otherwise), or prospects of the Company or any Subsidiary which,
in the good faith judgment of Buyers, make it inadvisable for Buyers to proceed
with the consummation of the transactions contemplated hereby.

         8.9 Other Documents. Buyers shall have received the certificates,
instruments, and documents listed below:

                      (a) In accordance with the denominations designated in
         Schedule 1.1, stock certificates in definitive form and duly executed
         on behalf of the Company, representing the portion of the Shares
         registered in the name of each Buyer.

                      (b) A copy of the resolutions of the Board of Directors of
         the Company authorizing the execution, delivery, and performance by the
         Company of this Agreement, certified by the secretary or an assistant
         secretary of the Company.

                      (c) Certificates from the Secretary of State of Texas and
         the Comptroller of Public Accounts of the State of Texas, each dated
         not more than ten days prior to the Closing Date, as to the legal
         existence and good standing, respectively, of the Company and the
         Subsidiaries under the laws of such state.

                      (d) Certificates from the Secretaries of State of the
         states listed on Schedule 3.2, as to the due qualification or licensing
         of the Company and the Subsidiaries, as applicable, to do business in
         such states, dated not more than ten days prior to the Closing Date.

                      (e) An original Shareholders' Agreement, Registration
         Agreement and Non- Compete Agreement, each duly signed by an authorized
         officer of the Company and all other parties thereto.

                      (f) A file-stamped copy of the Certificate of Designations
         required by Section 6.14 hereof and showing acceptance by the Texas
         Secretary of State.

                      (g) Such other certificates, instruments, and documents as
         may be reasonably requested by Buyers to carry out the intent and
         purposes of this Agreement.

         8.10 Conversion of Outstanding Preferred Stock. Any and all shares of
preferred stock of the Company outstanding on the date hereof shall have been
fully converted into Common Stock in accordance with the existing terms of such
preferred stock on the date hereof.






                                       28
<PAGE>   30
                                   ARTICLE IX.

                       TERMINATION, AMENDMENT, AND WAIVER

         9.1 Termination. This Agreement may be terminated and the transactions
contemplated hereby abandoned at any time prior to the Closing in the following
manner:

                      (a) by mutual written consent of the Company and Buyers;
         or

                      (b) by either the Company or Buyers, if:

                             (i) the Closing shall not have occurred on or
                      before May 15, 1999 unless such failure to close shall be
                      due to a breach of this Agreement by the party seeking to
                      terminate this Agreement pursuant to this clause (i); or

                            (ii) there shall be any statute, rule, or regulation
                      that makes consummation of the transactions contemplated
                      hereby illegal or otherwise prohibited or a Governmental
                      Entity shall have issued an order, decree, or ruling or
                      taken any other action permanently restraining, enjoining,
                      or otherwise prohibiting the consummation of the
                      transactions contemplated hereby, and such order, decree,
                      ruling, or other action shall have become final and
                      nonappealable; or

                      (c) by the Company, if (i) any of the representations and
         warranties of Buyers contained in this Agreement shall not be true and
         correct in any respect which is material to Buyers or the ability of
         Buyers to consummate the transactions contemplated hereby, or (ii)
         Buyers shall have failed to fulfill in any material respect any of
         their obligations under this Agreement, and, in the case of each of
         clauses (i) and (ii), such misrepresentation, breach of warranty, or
         failure (provided it can be cured) has not been cured within ten days
         after written notice thereof from the Company to Buyers; or

                      (d) by Buyers, if (i) any of the representations and
         warranties of the Company contained in this Agreement shall not be true
         and correct in any respect which is material to the Company and the
         Subsidiaries considered as a whole or the ability of the Company to
         consummate the transactions contemplated hereby, (ii) the Company shall
         have failed to fulfill in any material respect any of its obligations
         under this Agreement, and, in the case of each of clauses (i) and (ii),
         such misrepresentation, breach of warranty, or failure (provided it can
         be cured) has not been cured within ten days after written notice
         thereof from Buyers to the Company, or (iii) the due diligence
         conducted by Buyers and their representatives in connection with the
         proposed transactions contemplated hereby shall have caused Buyers or
         their representatives to become aware of any facts relating to the
         business, assets, results of operations, condition (financial or
         otherwise), or prospects of the Company




                                       29
<PAGE>   31
         or any Subsidiary which, in the good faith judgment of Buyers, make it
         inadvisable for Buyers to proceed with the consummation of the
         transactions contemplated hereby.

         9.2 Effect of Termination. In the event of the termination of this
Agreement pursuant to Section 9.1 by the Company, on the one hand, or Buyer, on
the other, written notice thereof shall forthwith be given to the other party
specifying the provision hereof pursuant to which such termination is made, and
this Agreement shall become void and have no effect, except that the agreements
contained in this Section and in Sections 6.1(b), 6.8, 6.12, 11.1, 11.5, and
11.14 and in Article XI shall survive the termination hereof. Nothing contained
in this Section shall relieve any party from liability for damages actually
incurred as a result of any breach of this Agreement.

         9.3 Amendment. This Agreement may not be amended except by an
instrument in writing signed by or on behalf of all the parties hereto.

         9.4 Waiver. The Company, on the one hand, or Buyers, on the other, may:
(i) waive any inaccuracies in the representations and warranties of the other
contained herein or in any document, certificate, or writing delivered pursuant
hereto, or (ii) waive compliance by the other with any of the other's agreements
or fulfillment of any conditions to its own obligations contained herein. Any
agreement on the part of a party hereto to any such waiver shall be valid only
if set forth in an instrument in writing signed by or on behalf of such party.
No failure or delay by a party hereto in exercising any right, power, or
privilege hereunder shall operate as a waiver thereof nor shall any single or
partial exercise thereof preclude any other or further exercise thereof or the
exercise of any other right, power, or privilege.

         9.5 Remedies Not Exclusive. The rights and remedies herein provided
shall be cumulative and not exclusive of any rights or remedies provided by law.
The rights and remedies of any party based upon, arising out of, or otherwise in
respect of any inaccuracy in or breach of any representation, warranty,
covenant, or agreement contained in this Agreement shall in no way be limited by
the fact that the act, omission, occurrence, or other state of facts upon which
any claim of any such inaccuracy or breach is based may also be the subject
matter of any other representation, warranty, covenant, or agreement contained
in this Agreement (or in any other agreement between the parties) as to which
there is no inaccuracy or breach.

                                   ARTICLE X.

                             COMMON STOCK CLAW-BACK

         In the event that, and only if, the Company, prior to the second
anniversary of the Closing Date, fully redeems all shares of Preferred Stock
issued to Buyers pursuant to this Agreement (the "Preferred Redemption"), then
the Company shall simultaneously purchase, and each Buyer shall sell, assign and
transfer, one-eighth (12.5%) of the total shares of Common Stock originally
issued




                                       30
<PAGE>   32
to such Buyer pursuant to this Agreement plus any Other Securities, subject to
adjustment as provided herein, for a total purchase price of $100 (the
"Redemption Price"). On the date of the Preferred Redemption, each Buyer shall
surrender a certificate or certificates for such shares to the Company and shall
thereupon be entitled to receive payment of its pro rata share of the Redemption
Price. If the Company effects a split or combination of the Common Stock,
including a dividend payable in shares of Common Stock, the number of shares of
Common Stock subject to purchase in connection with the Preferred Redemption
shall be proportionately adjusted.

                                   ARTICLE XI.

                          SURVIVAL OF REPRESENTATIONS;
                                 INDEMNIFICATION

         11.1 Survival. The representations and warranties of the parties hereto
contained in this Agreement or in any certificate, instrument, or document
delivered pursuant hereto shall survive the Closing without contractual
limitation, regardless of any investigation made by or on behalf of any party.

         11.2 Indemnification by Company. Subject to the terms and conditions of
this Article XI, the Company shall indemnify, defend, and hold harmless Buyers
from and against any and all claims, actions, causes of action, demands,
assessments, losses, damages, liabilities, judgments, settlements, penalties,
costs, and expenses (including reasonable attorneys' fees and expenses), of any
nature whatsoever (collectively, "Damages"), asserted against, resulting to,
imposed upon, or incurred by Buyers, directly or indirectly, by reason of or
resulting from any breach by the Company of any of its representations,
warranties, covenants, or agreements contained in this Agreement or in any
certificate, instrument, or document delivered pursuant hereto.

         11.3 Indemnification by Buyers. Subject to the terms and conditions of
this Article XI, each Buyer (severally and not jointly) shall indemnify, defend,
and hold harmless the Company from and against any and all Damages asserted
against, resulting to, imposed upon, or incurred by the Company, directly or
indirectly, by reason of or resulting from any breach by such Buyer of any of
its representations, warranties, covenants, or agreements contained in this
Agreement or in any certificate, instrument, or document delivered pursuant
hereto.

         11.4 Procedure for Indemnification. Promptly after receipt by an
indemnified party under Section 11.2 or 11.3 of notice of the commencement of
any action, such indemnified party shall, if a claim in respect thereof is to be
made against an indemnifying party under such Section, give written notice to
the indemnifying party of the commencement thereof, but the failure so to notify
the indemnifying party shall not relieve it of any liability that it may have to
any indemnified party except to the extent the indemnifying party demonstrates
that the defense of such action is prejudiced thereby. In case any such action
shall be brought against an indemnified party and it shall give




                                       31
<PAGE>   33



written notice to the indemnifying party of the commencement thereof, the
indemnifying party shall be entitled to participate therein and, to the extent
that it may wish, to assume the defense thereof with counsel reasonably
satisfactory to such indemnified party. If the indemnifying party elects to
assume the defense of such action, the indemnified party shall have the right to
employ separate counsel at its own expense and to participate in the defense
thereof. If the indemnifying party elects not to assume (or fails to assume) the
defense of such action, the indemnified party shall be entitled to assume the
defense of such action with counsel of its own choice, at the expense of the
indemnifying party. If the action is asserted against both the indemnifying
party and the indemnified party and there is a conflict of interests which
renders it inappropriate for the same counsel to represent both the indemnifying
party and the indemnified party, the indemnifying party shall be responsible for
paying for separate counsel for the indemnified party; provided, however, that
if there is more than one indemnified party, the indemnifying party shall not be
responsible for paying for more than one separate firm of attorneys to represent
the indemnified parties, regardless of the number of indemnified parties. If the
indemnifying party elects to assume the defense of such action, (a) no
compromise or settlement thereof may be effected by the indemnifying party
without the indemnified party's written consent (which shall not be unreasonably
withheld) unless the sole relief provided is monetary damages that are paid in
full by the indemnifying party and (b) the indemnifying party shall have no
liability with respect to any compromise or settlement thereof effected without
its written consent (which shall not be unreasonably withheld).

         11.5 Indemnification Despite Negligence. IT IS THE EXPRESS INTENTION OF
THE PARTIES HERETO THAT EACH PERSON TO BE INDEMNIFIED PURSUANT TO THIS ARTICLE
XI SHALL BE INDEMNIFIED AND HELD HARMLESS FROM AND AGAINST ALL DAMAGES AS TO
WHICH INDEMNITY IS PROVIDED FOR UNDER THIS ARTICLE XI NOTWITHSTANDING THAT ANY
SUCH DAMAGES ARISE OUT OF OR RESULT FROM THE ORDINARY, STRICT, SOLE, OR
CONTRIBUTORY NEGLIGENCE OF SUCH PERSON AND REGARDLESS OF WHETHER ANY OTHER
PERSON (INCLUDING THE OTHER PARTIES TO THIS AGREEMENT) IS OR IS NOT ALSO
NEGLIGENT.

                                  ARTICLE XII.

                                  MISCELLANEOUS

         12.1 Notices. All notices, requests, demands, and other communications
required or permitted to be given or made hereunder by any party hereto shall be
in writing and shall be deemed to have been duly given or made if (i) delivered
personally, (ii) transmitted by first class registered or certified mail,
postage prepaid, return receipt requested, (iii) sent by prepaid overnight
courier service, or (iv) sent by telecopy or facsimile transmission, answer back
requested, to the parties at the following addresses (or at such other addresses
as shall be specified by the parties by like notice):







                                       32
<PAGE>   34
         If to Energy PLC, EnCap III-B, BOCP or Fund III:

                           c/o EnCap Investments, L.C.
                           1100 Louisiana, Suite 3150
                           Houston, Texas  77002
                           Attention: D. Martin Phillips
                           Fax No.:  713-659-6130

                      with a copy to:

                           Thompson & Knight, P.C.
                           1700 Chase Tower, 600 Travis
                           Houston, TX  77002
                           Attention:  Michael K. Pierce, Esq.
                           Telefax: 713-217-2828

                      If to Kayne:

                           Kayne Anderson Investment Management
                           1800 Ave. of the Stars, # 1425
                           Los Angeles, California 90067
                           Attention:  Robert B. Sinnott
                           Fax No.: 310-284-6490

                      If to BACI:

                           Bank of America Capital Investors
                           100 North Tryon Street, 25th Floor
                           Charlotte, North Carolina 28255
                           Attention:  J. Travis Hain
                           Fax No.: 704-386-6432

                      If to EOS:

                           EOS Partners, L.P.
                           320 Park Avenue
                           New York, New York  10022
                           Attention:  Brian D. Young
                           Fax No.: 212-832-5815







                                       33
<PAGE>   35



                      If to SGCP:

                           SGC Partners II LLC
                           c/o SG Capital Partners, LLC
                           1221 Avenue of the Americas, 15th Floor
                           New York, NY  10020
                           Attention:  V. Frank Pottow
                           Fax No.: 212-278-5454

                      If to the Company:

                           Bargo Energy Company
                           700 Louisiana, Suite 3700
                           Houston, Texas 77002
                           Attention:  Tim J. Goff and Lee Seekely
                           Telefax:  (713) 236-9799

                      with, a copy to:

                           Butler & Binion, L.L.P.
                           1000 Louisiana, Suite 1600
                           Houston, TX  77002
                           Attention:  George G. Young, Esq.
                           Telefax:  713-237-3202

Such notices, requests, demands, and other communications shall be effective (i)
if delivered personally or sent by courier service, upon actual receipt by the
intended recipient, (ii) if mailed, upon the earlier of five days after deposit
in the mail or the date of delivery as shown by the return receipt therefor, or
(iii) if sent by telecopy or facsimile transmission, when the answer back is
received.

         12.2 Entire Agreement. This Agreement, together with the Schedules,
Exhibits, Annexes, and other writings referred to herein or delivered pursuant
hereto, constitute the entire agreement between the parties hereto with respect
to the subject matter hereof and supersede all prior agreements and
understandings, both written and oral, between the parties with respect to the
subject matter hereof.

         12.3 Binding Effect; Assignment; No Third Party Benefit. This Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective heirs, legal representatives, successors, and permitted assigns.
Except as otherwise expressly provided in this Agreement, neither this Agreement
nor any of the rights, interests, or obligations hereunder shall be assigned by
any of the parties hereto without the prior written consent of the other
parties, except that a Buyer



                                       34
<PAGE>   36
may assign to any affiliate of such Buyer any of such Buyer's rights, interests,
or obligations hereunder, upon notice to the other party or parties, provided
that (i) no such assignment shall relieve such Buyer of its obligations
hereunder and (ii) the transferee makes the representations in Sections 4.6
through 4.11 hereof. Except as provided in Article XI, nothing in this
Agreement, express or implied, is intended to or shall confer upon any person
other than the parties hereto, and their respective heirs, legal
representatives, successors, and permitted assigns, any rights, benefits, or
remedies of any nature whatsoever under or by reason of this Agreement.

         12.4 Severability. If any provision of this Agreement is held to be
unenforceable, this Agreement shall be considered divisible and such provision
shall be deemed inoperative to the extent it is deemed unenforceable, and in all
other respects this Agreement shall remain in full force and effect; provided,
however, that if any such provision may be made enforceable by limitation
thereof, then such provision shall be deemed to be so limited and shall be
enforceable to the maximum extent permitted by Applicable Law.

         12.5  GOVERNING LAW.  THIS AGREEMENT SHALL BE GOVERNED BY AND
CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE INTERNAL LAWS OF
THE STATE OF TEXAS, WITHOUT REGARD TO THE PRINCIPLES OF CONFLICTS
OF LAWS THEREOF.

         12.6 Further Assurances. From time to time following the Closing, at
the request of any party hereto and without further consideration, the other
party or parties hereto shall execute and deliver to such requesting party such
instruments and documents and take such other action (but without incurring any
material financial obligation) as such requesting party may reasonably request
in order to consummate more fully and effectively the transactions contemplated
hereby.

         12.7 Descriptive Headings. The descriptive headings herein are inserted
for convenience of reference only, do not constitute a part of this Agreement,
and shall not affect in any manner the meaning or interpretation of this
Agreement.

         12.8 Gender. Pronouns in masculine, feminine, and neuter genders shall
be construed to include any other gender, and words in the singular form shall
be construed to include the plural and vice versa, unless the context otherwise
requires.

         12.9 References. All references in this Agreement to Articles,
Sections, and other subdivisions refer to the Articles, Sections, and other
subdivisions of this Agreement unless expressly provided otherwise. The words
"this Agreement", "herein", "hereof", "hereby", "hereunder", and words of
similar import refer to this Agreement as a whole and not to any particular
subdivision unless expressly so limited. Whenever the words "include",
"includes", and "including" are used in this Agreement, such words shall be
deemed to be followed by the words "without limitation". Each reference herein
to a Schedule, Exhibit, or Annex refers to the item identified separately in
writing by the parties hereto as the described Schedule, Exhibit, or Annex to
this




                                       35
<PAGE>   37
Agreement. All Schedules, Exhibits, and Annexes are hereby incorporated in and
made a part of this Agreement as if set forth in full herein.

         12.10 Counterparts. This Agreement may be executed by the parties
hereto in any number of counterparts, each of which shall be deemed an original,
but all of which shall constitute one and the same agreement. Each counterpart
may consist of a number of copies hereof each signed by less than all, but
together signed by all, the parties hereto.

         12.11 Injunctive Relief. The parties hereto acknowledge and agree that
irreparable damage would occur in the event any of the provisions of this
Agreement were not performed in accordance with their specific terms or were
otherwise breached. It is accordingly agreed that the parties shall be entitled
to an injunction or injunctions to prevent breaches of the provisions of this
Agreement, and shall be entitled to enforce specifically the provisions of this
Agreement, in any court of the United States or any state thereof having
jurisdiction, in addition to any other remedy to which the parties may be
entitled under this Agreement or at law or in equity.

         12.12 Schedules (Disclosure). Each of the Schedules to this Agreement
shall be deemed to include and incorporate all disclosures made on the other
Schedules to this Agreement. It is understood and agreed that the specification
of any dollar amount in the representations and warranties contained in this
Agreement or the inclusion of any specific item in the Schedules is not intended
to imply that such amounts or higher or lower amounts, or the items so included
or other items, are or are not material, and no party shall use the fact of the
setting of such amounts or the fact of the inclusion of any such item in the
Schedules in any dispute or controversy between the parties as to whether any
obligation, item, or matter not described herein or included in a Schedule is or
is not material for purposes of this Agreement.

         12.13 Schedules (Construction). In the event of any inconsistency
between the statements in the body of this Agreement and those in the Schedules
(other than an exception expressly set forth as such in the Schedules in
relation to a specifically identified representation or warranty), those in this
Agreement shall control.

         12.14  Consent to Jurisdiction; Waiver of Jury Trial.

         (a) The parties hereto hereby irrevocably submit to the jurisdiction of
the courts of the State of Texas and the federal courts of the United States of
America located in Houston, Texas, and appropriate appellate courts therefrom,
over any dispute arising out of or relating to this Agreement or any of the
transactions contemplated hereby, and each party hereby irrevocably agrees that
all claims in respect of such dispute or proceeding may be heard and determined
in such courts. The parties hereby irrevocably waive, to the fullest extent
permitted by Applicable Law, any objection which they may now or hereafter have
to the laying of venue of any dispute arising out of or relating to this
Agreement or any of the transactions contemplated hereby brought in such court
or any defense of inconvenient forum for the maintenance of such dispute. Each
of the parties hereto agrees




                                       36
<PAGE>   38
that a judgment in any such dispute may be enforced in other jurisdictions by
suit on the judgment or in any other manner provided by law. This consent to
jurisdiction is being given solely for purposes of this Agreement and is not
intended to, and shall not, confer consent to jurisdiction with respect to any
other dispute in which a party to this Agreement may become involved.

         (b) Each of the parties hereto hereby consents to process being served
by any party to this Agreement in any suit, action, or proceeding of the nature
specified in subsection (a) above by the mailing of a copy thereof in the manner
specified by the provisions of Section 11.1.

         (c) FURTHERMORE, ALL PARTIES HERETO WAIVE ANY AND ALL RIGHTS TO HAVE A
JURY RESOLVE OR OTHERWISE PRESIDE, IN WHOLE OR IN PART, OVER ANY DISPUTE OR
PROCEEDING INVOLVING ANY OF THE PARTIES HERETO AND REGARDING (I) THIS AGREEMENT,
(II) THE DOCUMENTS REQUIRED HEREBY, OR (III) ANY OF THE TRANSACTIONS
CONTEMPLATED HEREBY OR THEREBY.

         12.15 Liability of Buyers. The liability of each Buyer with respect to
the agreements, covenants, representations and warranties of Buyers contained in
this Agreement or in any certificate, instrument, or document delivered pursuant
hereto shall be to the extent such agreements, covenants, representations or
warranties applies to himself, herself, or itself and not with respect to any
other Buyer.

         12.16 Consent to Certain Stock Issuances. By its execution hereof, each
Buyer hereby consents to the issuance of Common Stock upon exercise of warrants
and options to purchase Common Stock outstanding as of the date hereof and upon
exercise of options to purchase Common Stock granted as set forth on Schedule
6.7(a) hereof.

                                  ARTICLE XIII.

                                   DEFINITIONS

         13.1 Certain Defined Terms. As used in this Agreement, each of the
following terms has the meaning given it below:

                      "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, such person. For the purposes of this definition, "control" when
         used with respect to any person means the possession, directly or
         indirectly, of the power to direct or cause the direction of the
         management and policies of such person, whether through the ownership
         of voting securities, by contract, or otherwise; and the terms
         "controlling" and "controlled" have meanings correlative to the
         foregoing.





                                       37
<PAGE>   39
                      "Ancillary Documents" means each agreement, instrument,
         and document (other than this Agreement) executed or to be executed in
         connection with the transactions contemplated by this Agreement.

                      "Applicable Law" means any statute, law, rule, or
         regulation or any judgment, order, writ, injunction, or decree of any
         Governmental Entity to which a specified person or property is subject.

                      "Code" means the Internal Revenue Code of 1986, as
         amended.

                      "Company" means Bargo Energy Company, a Texas corporation,
         and, unless the context otherwise requires, includes the Company's
         predecessor, Future Petroleum Corporation, a Utah corporation.

                      "Encumbrances" means liens, charges, pledges, options,
         mortgages, deeds of trust, security interests, claims, restrictions
         (whether on voting, sale, transfer, disposition, or otherwise),
         easements, and other encumbrances of every type and description,
         whether imposed by law, agreement, understanding, or otherwise.

                      "ERISA" means the Employee Retirement Income Security Act
         of 1974, as amended.

                      "Exchange Act" means the Securities Exchange Act of 1934,
         as amended.

                      "GAAP" means generally accepted accounting principles in
         the United States of America from time to time.

                      "Governmental Entity" means any court or tribunal in any
         jurisdiction (domestic or foreign) or any federal, state, municipal, or
         other governmental body, agency, authority, department, commission,
         board, bureau, or instrumentality (domestic or foreign), as well as the
         New York Stock Exchange, The Nasdaq Stock Market, and any exchange upon
         which the Common Stock is listed from time to time.

                      "Material Adverse Effect" means any change, development,
         or effect (individually or in the aggregate) which is, or is reasonably
         likely to be, materially adverse (i) to the business, assets, results
         of operations or condition (financial or otherwise) of a party, or (ii)
         to the ability of a party to perform on a timely basis any material
         obligation under this Agreement or any agreement, instrument, or
         document entered into or delivered in connection herewith.

                      "Other Securities" means any stock (other than Common
         Stock), bond, note or other securities issued to a holder of Common
         Stock (on account of Common Stock issued




                                       38
<PAGE>   40
         pursuant to this Agreement) pursuant to any merger, consolidation,
         reorganization, recapitalization, dividend or other distribution.

                      "Permits" means licenses, permits, franchises, consents,
         approvals, variances, exemptions, and other authorizations of or from
         Governmental Entities.

                      "person" means any individual, corporation, partnership,
         joint venture, association, joint-stock company, trust, enterprise,
         unincorporated organization, or Governmental Entity.

                      "Proceedings" means all proceedings, actions, claims,
         suits, investigations, and inquiries by or before any arbitrator or
         Governmental Entity.

                      "reasonable best efforts" means a party's reasonable best
         efforts in accordance with reasonable commercial practice and without
         the incurrence of unreasonable expense.

                      "Securities Act" means the Securities Act of 1933, as
         amended.

                      "Subsidiary" means any corporation more than 50% of whose
         outstanding voting securities, or any general partnership, joint
         venture, or similar entity more than 50% of whose total equity
         interests, is owned, directly or indirectly, by the Company, or any
         limited partnership of which the Company or any Subsidiary is a general
         partner.

                      "Taxes" means any income taxes or similar assessments or
         any sales, excise, occupation, use, ad valorem, property, production,
         severance, transportation, employment, payroll, franchise, or other tax
         imposed by any United States federal, state, or local (or any foreign
         or provincial) taxing authority, including any interest, penalties, or
         additions attributable thereto.

                      "Tax Return" means any return or report, including any
         related or supporting information, with respect to Taxes.

                      "to the best knowledge" of a specified person (or similar
         references to a person's knowledge) means all information to be
         attributed to such person actually or constructively known to (a) such
         person in the case of an individual or (b) in the case of a corporation
         or other entity, an executive officer or employee who devoted
         substantive attention to matters of such nature during the ordinary
         course of his employment by such person. A person has "constructive
         knowledge" of those matters which the individual involved could
         reasonably be expected to have as a result of undertaking an
         investigation of such a scope and extent as a reasonably prudent man
         would undertake concerning the particular subject matter.






                                       39
<PAGE>   41
         IN WITNESS WHEREOF, the parties have executed this Agreement, or caused
this Agreement to be executed by their duly authorized representatives, all as
of the day and year first above written.

                                       THE COMPANY:

                                       BARGO ENERGY COMPANY


                                       By:
                                          --------------------------------------
                                          Name:
                                               ---------------------------------
                                          Title:
                                                --------------------------------



                                       BUYERS:


                                       ENERGY CAPITAL INVESTMENT COMPANY PLC


                                       By:
                                          --------------------------------------
                                          Gary R. Petersen
                                          Director


                                       ENCAP ENERGY CAPITAL FUND III, L.P.
                                       By: EnCap Investments L.C., General
                                            Partner


                                       By:
                                          --------------------------------------
                                          D. Martin Phillips
                                          Managing Director


                                       ENCAP ENERGY CAPITAL FUND III-B, L.P.
                                       By: EnCap Investments L.C., General
                                            Partner


                                       By:
                                          --------------------------------------
                                          D. Martin Phillips
                                          Managing Director

<PAGE>   42
                                       BOCP ENERGY PARTNERS, L.P.
                                       By: EnCap Investments L.C., Manager


                                       By:
                                          --------------------------------------
                                          D. Martin Phillips
                                          Managing Director


                                       EOS PARTNERS, L.P.


                                       By:
                                          --------------------------------------
                                          Name:
                                               ---------------------------------
                                          Title:
                                                --------------------------------


                                       EOS PARTNERS SBIC, L.P.
                                       By: Eos SBIC General, L.P., its general
                                            partner
                                         By: Eos SBIC, Inc., its general partner


                                              By:
                                                 -------------------------------
                                                 Name:
                                                      --------------------------
                                                 Title:
                                                       -------------------------


                                       EOS PARTNERS SBIC II, L.P.
                                       By: Eos SBIC General II, L.P., its
                                            general partner
                                         By: Eos SBIC II, Inc., its general
                                              partner


                                              By:
                                                 -------------------------------
                                                 Name:
                                                      --------------------------
                                                 Title:
                                                       -------------------------


                                       SGC PARTNERS II LLC


                                       By:
                                          --------------------------------------
                                          V. Frank Pottow
                                          Managing Director






<PAGE>   43
                                       BANCAMERICA CAPITAL INVESTORS SBIC I,
                                       L.P.
                                       By: BancAmerica Capital Management SBIC
                                            I, LLC, its general partner
                                        By: BancAmerica Capital Management
                                             I, L.P., its its sole member
                                         By: BACM I GP, LLC, its general partner


                                             By:
                                                --------------------------------
                                                J. Travis Hain
                                                Managing Director


                                       KAYNE ANDERSON ENERGY FUND, L.P.



                                       By:
                                          --------------------------------------
                                          Name:
                                               ---------------------------------
                                          Title:
                                                --------------------------------



<PAGE>   44

                                  Schedule 1.1

                                    Investors



<TABLE>
<CAPTION>
- -------------------------------------------------------------- -------------------- --------------------
                                               Shares of            Shares of             Purchase
- -------------------------------------------------------------- -------------------- --------------------
                   Name                     Preferred Stock        Common Stock            Price
- -------------------------------------------------------------- -------------------- --------------------
<S>                                         <C>                    <C>                    <C>
EnCap Energy Capital Fund III L. P.                    637,185            5,583,755         $  6,371,850
- -------------------------------------------------------------- -------------------- --------------------
EnCap Energy Capital Fund III-B L. P.                  481,904            4,222,999            4,819,040
- -------------------------------------------------------------- -------------------- --------------------
BOCP Energy Partners, L. P.                            155,911            1,366,277            1,559,110
- -------------------------------------------------------------- -------------------- --------------------
Energy Capital Investment Co. PLC                      225,000            1,971,712            2,250,000
- -------------------------------------------------------------- -------------------- --------------------
Kayne Anderson Energy, L. P.                         1,000,000            8,763,162           10,000,000
- -------------------------------------------------------------- -------------------- --------------------
BancAmerica Capital Investors SBIC I, L.P.           1,500,000           13,144,743           15,000,000
- -------------------------------------------------------------- -------------------- --------------------
Eos Partners SBIC, L. P.                               390,000            3,417,633            3,900,000
- -------------------------------------------------------------- -------------------- --------------------
Eos Partners SBIC II, L. P.                             72,500              635,329              725,000
- -------------------------------------------------------------- -------------------- --------------------
Eos Partners L. P.                                      37,500              328,619              375,000
- -------------------------------------------------------------- -------------------- --------------------
SG Capital Partners II LLC                             500,000            4,381,581            5,000,000
- -------------------------------------------------------------- -------------------- --------------------
                  Total                              5,000,000           43,815,810        $  50,000,000
- -------------------------------------------------------------- -------------------- --------------------
</TABLE>


<PAGE>   1
                                                                     EXHIBIT

================================================================================

                              MANAGEMENT AGREEMENT


                               ------------------


                                  BY AND AMONG

                      BANC ONE CAPITAL PARTNERS VIII, LTD.,

                           BOCP ENERGY PARTNERS, L.P.

                                       AND

                             ENCAP INVESTMENTS L.C.

                               ------------------


                           DATED AS OF AUGUST 21, 1997



================================================================================

<PAGE>   2
                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                ----
<S>      <C>           <C>                                                                                      <C>
ARTICLE I  DEFINITIONS, REFERENCES AND CONSTRUCTION...............................................................1
         Section 1.1.  Definitions................................................................................1
         Section 1.2.  References and Construction................................................................4

ARTICLE II  ENGAGEMENT AS MANAGER.................................................................................5
         Section 2.1.  Engagement.................................................................................5
         Section 2.2.  Delegation of Rights, Power and Authority..................................................5
         Section 2.3.  Representatives of BOCP....................................................................9

ARTICLE III  DUTIES AND OBLIGATIONS OF MANAGER...................................................................10
         Section 3.1.  Investments...............................................................................10
         Section 3.2.  Time Devoted to Partnership Business......................................................10
         Section 3.3.  Other Activities..........................................................................11

ARTICLE IV  LIABILITY AND INDEMNIFICATION........................................................................13
         Section 4.1.  Liability.................................................................................13
         Section 4.2.  Indemnification...........................................................................13

ARTICLE V  REIMBURSEMENT; MANAGEMENT FEE.........................................................................14
         Section 5.1.  Payment or Reimbursement of Organization Costs and
                         Operating Costs.........................................................................14
         Section 5.2.  Management Fee............................................................................15
         Section 5.3.  Transaction, Break-up and Other Fees......................................................16
         Section 5.4.  Corporate Finance Fees....................................................................17

ARTICLE VI  CERTAIN BANKING REGULATORY CONSIDERATIONS............................................................18
         Section 6.1.      Regulatory Limitations................................................................18
         Section 6.2.      Voting Power..........................................................................19
         Section 6.3.      Equity Ownership......................................................................19
         Section 6.4.      Disposition of Investment.............................................................19
         Section 6.5.      Information...........................................................................20
         Section 6.6.      Applicable Regulations and Other Definitions..........................................20

ARTICLE VII  CERTAIN EVENTS CONCERNING PRINCIPALS................................................................20

ARTICLE VIII  REPORTING; BANKING; AND CONFIDENTIALITY............................................................21
         Section 8.1.  Reports...................................................................................21
         Section 8.2.  Bank Accounts.............................................................................21
         Section 8.3.  Confidentiality...........................................................................22
         Section 8.4.  BOCP Reports..............................................................................23

ARTICLE IX  TERM.................................................................................................23
</TABLE>



<PAGE>   3



<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                ----
<S>      <C>           <C>                                                                                      <C>
ARTICLE X RELATIONSHIP OF THE PARTIES............................................................................24

ARTICLE XI AMENDMENTS; MEETINGS..................................................................................24
         Section 11.1  Amendments................................................................................24
         Section 11.2 Meetings...................................................................................25

ARTICLE XII  ADVISORY BOARD......................................................................................25

ARTICLE XIII  MISCELLANEOUS......................................................................................27
         Section 13.1.  Notices..................................................................................27
         Section 13.2.  Entire Agreement.........................................................................27
         Section 13.3.  Severability.............................................................................27
         Section 13.4.  No Waiver................................................................................28
         Section 13.5.  Applicable Law...........................................................................28
         Section 13.6.  Successors and Assigns...................................................................28
         Section 13.7.  Attorneys' Fees..........................................................................28
         Section 13.8.  Related Agreements.......................................................................28
         Section 13.9.   No Third Party Beneficiaries............................................................28
         Section 13.10.  Counterparts............................................................................28
         Section 13.11.  Representations and Warranties of the Manager...........................................28
         Section 13.12.  Representations and Warranties of BOCP and the Partnership..............................30
         Section 13.13.  Survival of Representations and Warranties..............................................31
</TABLE>

<PAGE>   4
                              MANAGEMENT AGREEMENT

         THIS MANAGEMENT AGREEMENT (this "AGREEMENT") is made and entered into
as of the 21st day of August, 1997, by and among Banc One Capital Partners VIII,
Ltd., an Ohio limited liability company ("BOCP"), BOCP Energy Partners, L.P., a
Texas limited partnership (the "PARTNERSHIP"), and EnCap Investments L.C., a
Texas limited liability company ("ENCAP").

                                    RECITALS:

         A. BOCP is the sole general partner of the Partnership. As provided in
the Partnership Agreement (as defined herein), the Partnership has been formed
to make Target Energy-Related Assets (as defined herein).

         B. BOCP and the Partnership desire to engage EnCap, and EnCap desires
to be engaged by BOCP and the Partnership, as manager of the Partnership on the
terms and conditions set forth herein.

                                   AGREEMENT:

         NOW, THEREFORE, in consideration of the foregoing Recitals and the
mutual covenants and agreements contained herein, the parties hereto do hereby
agree as follows:

                                    ARTICLE I

                    DEFINITIONS, REFERENCES AND CONSTRUCTION

         SECTION 1.1.      DEFINITIONS.

         (a) When used in this Agreement, the following terms shall have the
respective meanings set forth below:

         "ADVISORY BOARD" shall have the meaning assigned to it in Article XII.

         "AFFILIATES" shall mean, when used with respect to another person, a
person controlling, controlled by or under common control with such other
person; provided, however, that the term "Affiliate" when used with respect to
the Manager shall include the Principals, the employees of the Manager and the
parents, spouses and descendants of the Principals and the employees of the
Manager, but such term shall not include (i) any partner of the Partnership,
(ii) the Partnership, or (iii) any general partner of a limited partnership in
which an Existing Fund is a limited partner only. As used in this definition of
"Affiliate", the term "CONTROL" shall mean the possession,




                                      -1-
<PAGE>   5
directly or indirectly, 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. As used in this Agreement, the term
"PERSON" shall include an individual, a corporation, a partnership, a limited
liability company, an association or other entity, an estate, a joint stock
company and a trust.

         "BOCP" shall have the meaning assigned to it in the introductory
paragraph to this Agreement.

         "BRIDGE LOAN" shall have the meaning assigned to it in Section
2.2(b)(vi).

         "CORPORATE FINANCE FEE" shall have the meaning assigned to it in
Section 5.4.

         "DESIGNATED PRINCIPALS" shall mean David B. Miller, Gary R. Petersen,
D. Martin Phillips and Robert L. Zorich.

         "ECIC" shall have the meaning assigned to it in Section 3.3(c).

         "ENCAP" shall have the meaning assigned to it in the introductory
paragraph to this Agreement.

         "ENCAP FUND PARTNERSHIP" shall have the meaning assigned to it in
Section 3.3(c).

         "EXISTING FUND" shall mean EnCap Equity 1994 Limited Partnership, a
Texas limited partnership, EnCap Equity 1996 Limited Partnership, a Texas
limited partnership, ECIC, or ECIC Corporation, a Texas corporation.

         "MANAGEMENT FEE" shall have the meaning assigned to it in Section
5.2(a).

         "MANAGER" shall have the meaning assigned to it in Section 2.1.

         "OPERATING COSTS" shall mean all direct, out-of-pocket costs and
expenses reasonably incurred either by the Partnership or by the Manager or an
Affiliate thereof on behalf of the Partnership relating to the management,
conduct and operation of Partnership business, including (a) the fees and
expenses associated with the preparation of the Partnership's financial
statements and the reports and other information to investors under the
Partnership Agreement, tax returns and Forms K-1, printing expenses, mailing and
courier expenses, fees and expenses of establishing bank or custodial accounts
and insurance costs and expenses, (b) the fees, costs and expenses incurred in
connection with investigating, negotiating, acquiring, holding, selling or
exchanging of Investments (including fees and expenses of lawyers, accountants,
petroleum engineers and consultants, brokerage or finder's fees, investment
banker's fees, commitment fees, underwriting discounts or sales fees, but
excluding travel and entertainment expenses in connection therewith), (c) fees,
costs and expenses of the type described in clause (b) above incurred in
connection with


                                      -2-
<PAGE>   6
potential or proposed but unconsummated transactions, (d) legal, audit and other
expenses incurred in connection with the registration of the offer and sale of
Securities owned by the Partnership under the Securities Act of 1933, as
amended, and any applicable state or foreign securities laws, (e) the costs and
other amounts attributable to the Partnership's obligations under Section 4.2,
(f) the costs and expenses attributable to the Advisory Board and the conduct of
its meetings or attributable to the annual meetings of as provided in Section
11.2, and (g) other extraordinary, nonrecurring expenses, including the costs
and expenses of prosecuting or defending a litigation claim; provided, however,
that Operating Costs shall not include any of the following costs and expenses
incurred by the Partnership or the Manager or any of its Affiliates: (i) the
salaries, wages and employee benefits of all officers, directors, and employees
of the Manager or an Affiliate thereof, (ii) office rent, utility charges and
equipment and furniture costs and expenses, and (iii) any other general,
administrative and overhead expense, including insurance premiums relating to
the matters described in this clause (iii) and the preceding clauses (i) and
(ii).

         "PARALLEL INVESTMENT ENTITY" shall have the meaning assigned to it in
Section 3.3(c).

         "PARTNERSHIP" shall have the meaning assigned to it in the introductory
paragraph to this Agreement.

         "PARTNERSHIP AGREEMENT" shall mean that certain Agreement of Limited
Partnership of even date herewith, by and between BOCP, as general partner, and
EnCap, as limited partner, establishing the Partnership.

         "PRINCIPALS" shall mean Eugene C. Fiedorek, David B. Miller, Gary R.
Petersen, D. Martin Phillips and Robert L. Zorich.

         "SUBSEQUENT FUND" shall have the meaning assigned to such term in
Section 3.3(b).

         "TRIGGER EVENT" shall have the meaning assigned to such term in Article
VII.

         "UNPAID COMMITMENT" shall mean, (a) with respect to the BOCP at a given
point in time, the sum of BOCP's Unpaid Debt Commitment and Unpaid Equity
Commitment, and (b) with respect to EnCap at a given point in time, EnCap's
Unpaid Equity Commitment.

         (b) When used in this Agreement, the following terms shall have the
respective meanings assigned to them in the Partnership Agreement:

         "ACT"
         "ADVANCES"
         "AVAILABLE CASH"
         "BUSINESS DAY"
         "CAPITAL CONTRIBUTION"
         "CATCH-UP PAYOUT"


                                      -3-
<PAGE>   7
         "COMMITMENT PERIOD"
         "EQUITY-LINKED COMPANY"
         "EQUITY-LINKED INVESTMENTS"
         "FOLLOW-ON INVESTMENTS
         "INITIAL FUNDING DATE"
         "INVESTMENTS"
         "MARKET VALUE"
         "MEZZANINE LOAN"
         "NON-DEFAULTING PARTNER"
         "PORTFOLIO COMPANY"
         "PREFERRED RETURN PAYOUT"
         "PRIMARY INVESTMENT PERIOD"
         "PROJECT EQUITY COMPANY"
         "SECURITIES"
         "TARGET ENERGY-RELATED ASSETS"
         "TOTAL COMMITMENTS"
         "UNPAID DEBT COMMITMENT"
         "UNPAID EQUITY COMMITMENT"

         SECTION 1.2.      REFERENCES AND CONSTRUCTION.

         (a) All references in this Agreement to articles, sections, subsections
and other subdivisions refer to corresponding articles, sections, subsections
and other subdivisions of this Agreement unless expressly provided otherwise.

         (b) Titles appearing at the beginning of any of such subdivisions are
for convenience only and shall not constitute part of such subdivisions and
shall be disregarded in construing the language contained in such subdivisions.

         (c) The words "this Agreement", "this instrument", "herein", "hereof",
"hereby", "hereunder" and words of similar import refer to this Agreement as a
whole and not to any particular subdivision unless expressly so limited.

         (d) Words in the singular form shall be construed to include the plural
and vice versa, unless the context otherwise requires. Pronouns in masculine,
feminine and neuter genders shall be construed to include any other gender.

         (e) Examples shall not be construed to limit, expressly or by
implication, the matters they illustrate.

         (f) The word "includes" and its derivatives means "includes, but is not
limited to" and corresponding derivative expressions.



                                      -4-
<PAGE>   8
         (g) All references herein to "$" or "dollars" shall refer to U.S.
Dollars.

         (h) Exhibit 13.8 to this Agreement is attached hereto. Such Exhibit is
incorporated herein by reference for all purposes and references to this
Agreement shall also include such Exhibit unless the context in which used shall
otherwise require.

                                   ARTICLE II

                              ENGAGEMENT AS MANAGER

         SECTION 2.1.  ENGAGEMENT.  Subject to the terms and conditions hereof,
(a) BOCP and the Partnership hereby engage EnCap as manager of the Partnership
and (b) EnCap agrees to be engaged by BOCP and the Partnership as manager of the
Partnership. EnCap will sometimes be referred to herein as the "MANAGER".

         SECTION 2.2.  DELEGATION OF RIGHTS, POWER AND AUTHORITY.

         (a) Subject to terms and conditions hereof (including the limitations
contained in this subsection (a) and in subsections (b) and (c) below), BOCP
hereby delegates to the Manager all of BOCP's management rights as general
partner under the Partnership Agreement, and the concomitant power and
authority, including the following:

                  (i)  to cause the Partnership to make or purchase privately
         negotiated Investments in, or with respect to, Target Energy-Related
         Assets;

                  (ii) to monitor the Partnership's Investments and to vote,
         take any action or exercise any right, directly or indirectly, required
         of or accorded to the Partnership with respect to the Investments or
         any other Partnership assets;

                  (iii) to sell, exchange, transfer or otherwise dispose of all
         or any portion of the Investments or other Partnership assets;

                  (iv) to negotiate, make and to enter into such agreements and
         contracts with such parties and to give such receipts, releases and
         discharges with respect to any and all of the foregoing and any matters
         incident thereto as the Manager may deem advisable or appropriate;

                  (v) to employ from time to time third parties to render
         services to the Partnership, including but not limited to, attorneys,
         independent certified public accountants, petroleum engineers,
         consultants, brokers, agents and advisors (including attorneys,
         accountants, petroleum engineers, consultants, brokers, agents and
         advisors who also may act as attorneys, accountants, petroleum
         engineers, consultants, brokers, agents and advisors for the Manager or
         any of its Affiliates), to the extent that the service to be


                                      -5-
<PAGE>   9



         rendered to the Partnership by any such third party is generally
         related to the business purpose or the day-to-day investment
         activities of the Partnership;

                  (vi) to procure and maintain in force such insurance as the
         Manager shall deem prudent to serve as protection against liability for
         loss and damage which may be occasioned by the activities to be engaged
         in by the Partnership;

                  (vii) to control any matters affecting the rights and
         obligations of the Partnership, including the conduct of any litigation
         or arbitration proceedings and the incurring of legal expenses and the
         settlement of claims and litigation, to the extent that any such matter
         is generally related to the business purpose or the day-to-day
         investment activities of the Partnership;

                  (viii) to open, maintain and close bank accounts and custodial
         accounts and to execute and deliver all checks, drafts, endorsements
         and other orders for the payment of Partnership funds;

                  (ix) to appear and to represent the Partnership before any
         governmental authority or regulatory agency and to make all necessary
         or appropriate filings before such authority or agency, to the extent
         that any such appearance, representation or filing is generally related
         to the business purpose or the day-to-day investment activities of the
         Partnership;

                  (x) to request payment of Advances and Capital Contributions
         as provided in Article III of the Partnership Agreement;

                  (xi) to determine Available Cash;

                  (xii) to cause the Partnership to make payments in respect of
         Advances and distributions of cash, Securities and other assets to the
         Partners as provided in Article IV and Section 9.3 of the Partnership
         Agreement;

                  (xiii) to determine the Market Value of Partnership assets
         under the circumstances provided in the Partnership Agreement; and

                  (xiv) to take such other action, execute and deliver such
         other documents and perform such other acts as may be deemed by the
         Manager to be necessary or advisable to carry out the business and
         affairs of the Partnership.

Without limiting anything herein, in connection with the exercise of the rights,
power and authority delegated to it hereunder by BOCP, the Manager shall be
subject to any limitations on such rights, power and authority set forth in the
Partnership Agreement.



                                      -6-
<PAGE>   10
         (b) Notwithstanding any other provisions of this Agreement or the
Partnership Agreement to the contrary, the Manager shall not have the right,
power or authority to, and shall not, do, perform or authorize any of the
following without having received the prior written consent of BOCP:

                  (i) guarantee in the name or on behalf of the Partnership the
         payment of money or the performance of any contract or other obligation
         of any person; provided that the Manager shall be permitted to cause
         the Partnership to make a guarantee in connection with making an
         Investment in or with respect to a Portfolio Company (A) so long as the
         aggregate amount of such guarantees outstanding at any time plus the
         aggregate Unpaid Debt Commitment and Unpaid Equity Commitments
         outstanding at such time do not exceed the Total Commitments and (B)
         provided that the amount of any such guarantee shall be considered to
         be an outstanding Investment for the purposes of applying the
         restrictions set forth below in this Section 2.2(b);

                  (ii) cause the Partnership to file a voluntary petition in
         bankruptcy or take any other similar action;

                  (iii) merge or consolidate the Partnership with any
         partnership or other entity, convert the Partnership into another type
         of entity, or cause the Partnership to participate in an exchange of
         interests or some other type of business combination with any
         partnership or other entity;

                  (iv) cause the Partnership to engage in any transactions with
         the Manager or any of its Affiliates except as expressly provided for
         herein;

                  (v) except as provided in paragraph (vi) below, cause the
         Partnership to expend more than 15% of the Total Commitments in any
         single Investment hereunder; provided, however, that in connection with
         a given Project Equity Company in which the Partnership acquires an
         interest hereunder, the foregoing provisions of this paragraph (v)
         shall not preclude the Manager from causing the Partnership to purchase
         additional Securities in or contribute additional capital to such
         Project Equity Company for the purpose of financing an additional
         acquisition by such Project Equity Company of Target Energy-Related
         Assets which are not significantly related geographically to the Target
         Energy-Related Assets owned or held by such Project Equity Company, so
         long as the purchase price of such additional Securities or the amount
         of such additional capital does not exceed 15% of the Total
         Commitments; provided, further, that the foregoing provisions of this
         paragraph (v) shall not preclude the Manager from causing the
         Partnership to form a new Project Equity Company and to make a new
         Project Equity Investment with respect thereto, even though the person
         with which the Partnership is making such Project Equity Investment is
         an Equity-Linked Company or is a person with which or to which the
         Partnership has previously made a Project Equity Investment or a
         Mezzanine Loan (as applicable), so long as the amount of such new
         Project Equity Investment does not exceed 15% of the Total



                                      -7-
<PAGE>   11
         Commitments; and, provided, further, that the foregoing provisions of
         this paragraph (v) shall not preclude the Manager from causing the
         Partnership to make a new Mezzanine Loan even though the person to
         which the Mezzanine Loan is to be made is an Equity- Linked Company or
         is a person with which the Partnership has previously made a Project
         Equity Investment, so long as the amount of such new Mezzanine Loan
         does not exceed 15% of the Total Commitments;

                  (vi) cause the Partnership to make a "bridge" or interim loan
         (a "BRIDGE LOAN"), except to the extent the Manager determines in its
         sole discretion that such Bridge Loan is required in order to
         facilitate the making of a permanent Investment and provided that the
         amount of such Bridge Loan, when added to the amount of such permanent
         Investment, does not exceed 25% of the Total Commitments;

                  (vii) cause the Partnership to make Mezzanine Loans hereunder
         which in the aggregate would exceed 25% of the Total Commitments or to
         make Equity-Linked Investments hereunder which in the aggregate would
         exceed 35% of the Total Commit ments;

                  (viii) cause the Partnership to have invested and unrepaid at
         any time Investments made to or with respect to any Portfolio Company
         and its Affiliates in an aggregate amount in excess of 20% of the Total
         Commitments;

                  (ix) cause the Partnership to make an investment in any fund
         or similar collective investment entity that provides for a carried
         interest or management fee to be paid to any person, except that the
         Manager shall have the power and authority to cause the Partnership to
         invest in any partnership or other entity if such partnership or other
         entity (A) is or will be primarily engaged in the energy business and
         is not or will not be primarily engaged in the business of owning or
         investing in entities managed by third parties (i.e., entities that are
         not majority-owned subsidiaries), or (B) has been approved by
         two-thirds or more of the members of the Advisory Board;

                  (x)  cause the Partnership to borrow any money or pledge or
         encumber Partnership assets;

                  (xi) cause the Partnership to reinvest the proceeds received
         by the Partnership from the sale of any Investment;

                  (xii) cause the Partnership to extend the 10-year period
         referenced in Section 9.1(a) of the Partnership Agreement;

                  (xiii) cause the Partnership to invest in any issuer where the
         Manager or an Affiliate thereof has an equity or debt interest in such
         issuer; provided, and without limiting clause (c) of the definition of
         Affiliate, that nothing in this Agreement shall prohibit or


                                      -8-
<PAGE>   12
         restrict the Partnership from making an Investment in any Portfolio
         Company (A) which is a limited partnership, the general partner of
         which is also the general partner of a limited partnership in which an
         Existing Fund is a limited partner, or (B) which is another entity, the
         manager or operator of which is also the general partner, manager or
         operator of a limited partnership or other entity in which an Existing
         Fund is a limited partner and/or a debt or equity investor; provided,
         further, that the preceding clauses (A) and (B) shall not authorize the
         Partnership to make any Investment in a Portfolio Company and where the
         Manager or any of its Affiliates is also a general partner, manager or
         operator of any such limited partnership or other entity;

                  (xiv) select the Partnership's outside accountants in
         connection with the preparation and maintenance of the Partnership's
         books of account; or

                  (xv) exercise any of the rights, power and authority set forth
         in either Section 2.2(a)(vii) or Section 2.2(a)(ix) to the extent any
         such matter, appearance, representation or filing generally relates to
         compliance, or a violation or potential violation, by BOCP or its
         Affiliates with Applicable Regulations (as such term is defined in
         Article VI).

         (c) Notwithstanding subsection (a) above or anything else in this
Article II or elsewhere herein to the contrary, BOCP expressly reserves to
itself, and does not delegate to Manager hereunder:

                  (i) all monetary or financial obligations or rights of BOCP
         under the Partnership Agreement, including (A) the obligation of BOCP
         to make Advances or Capital Contributions to the Partnership under
         Article III of the Partnership Agreement and (B) the right of BOCP to
         receive allocations and distributions under Article IV and Section 9.3
         of the Partnership Agreement;

                  (ii) all rights and elections BOCP may have as a
         "Non-Defaulting Partner" under Section 3.3 of the Partnership
         Agreement; and

                  (iii) all rights BOCP may have under the Partnership Agreement
         pertaining to matters requiring the vote, consent or agreement of, or
         waiver by, BOCP, including the matters referenced in Sections 9.1(c),
         10.1(a), 10.2 and 11.9 of the Partnership Agreement.

         SECTION 2.3. REPRESENTATIVES OF BOCP. Upon request of the Manager, BOCP
shall provide to the Manager a list of each officer, attorney-in-fact, employee
and other person who is then authorized to act for or on behalf of BOCP with
respect to the matters provided for in this Agreement. The Manager shall be
entitled to fully rely on any vote, consent, election or other action given,
made or taken by such person on behalf of BOCP, and until the Manager is
notified in writing to the contrary, such person shall be authorized to take all
action on behalf of BOCP which BOCP is authorized to take hereunder.


                                      -9-
<PAGE>   13
                                   ARTICLE III

                        DUTIES AND OBLIGATIONS OF MANAGER

         SECTION 3.1.  INVESTMENTS.

         (a) The Manager will use its best efforts to find investment
opportunities suitable for the Partnership.

         (b) Notwithstanding anything herein to the contrary, Investments by the
Partnership in oil and gas properties, either through a Project Equity
Investment or a Mezzanine Loan, shall be supported by proved oil and gas
reserves. Further, the Manager agrees that prior to making such an Investment
hereunder, the proved oil and gas reserves will be confirmed for the Partnership
by any of the following independent petroleum engineers: Cawley, Gillespie &
Associates, Inc.; DeGolyer & MacNaughton; Miller and Lents; Netherland, Sewell &
Associates, Inc.; Ryder Scott Company; T.J. Smith & Associates; or such other
firm of independent petroleum engineers as shall be designated by the Manager
and approved by the Advisory Board.

         (c) The Manager in its sole discretion may offer co-investment
opportunities to BOCP and its designated Affiliates, on terms identical or
substantially similar to, and no more favorable than (in any material respect),
those offered to the Partnership. BOCP, to the extent it or its designated
Affiliate desires to participate in such opportunities, shall notify the Manager
in writing at any time of the types, amounts and other parameters of the
co-investments in which BOCP or such Affiliate has an interest. In this regard,
it is the intention of the Manager to so offer co- investment opportunities,
when practicable and feasible, and in any event prior to offering such
opportunities to a person other than ECIC, the Parallel Investment Entities, the
investors in the Parallel Investment Entities and BOCP and its designated
Affiliates; provided, that the Manager shall be under no obligation to do so.
The Manager shall not provide investment advice with respect to any such
co-investment opportunity, and should BOCP or a designated Affiliate participate
in such a co-investment opportunity, it shall be solely responsible for making
its own decision as to the merits of such opportunity.

         (d) In the event in excess of 35% of the Total Commitments are to be
called by the Partnership under Section 3.2 of the Partnership Agreement in any
twelve-month period, the Manager shall give notice of such event to BOCP as soon
as is reasonably possible.

         SECTION 3.2. TIME DEVOTED TO PARTNERSHIP BUSINESS. During the period
commencing as of the date hereof and ending on the first to occur of (a) the end
of the Commitment Period and (b) the point in time at which a Subsequent Fund
organized in accordance with the terms hereof makes its first investment, the
Manager and the Designated Principals (while active as employees of the
Manager), on a collective basis, shall devote a substantial majority of their
business time to the business and operations of the Partnership, ECIC and the
Parallel Investment Entities; provided, however, that it is specifically
understood and agreed that neither the Manager nor the



                                      -10-
<PAGE>   14
Designated Principals, either individually or on a collective basis, shall be
required to devote full time to Partnership business. After such period, the
Manager and the Designated Principals (while active as employees of the Manager)
shall devote such amount of their business time as is reasonably necessary to
manage properly the affairs and activities of the Partnership.

         SECTION 3.3.  OTHER ACTIVITIES.

         (a) During the Primary Investment Period, the Manager and its
Affiliates, either directly or indirectly, shall not purchase or make any
Investment in or with respect to Target Energy- Related Assets, except for the
following: (i) any investments, securities or other assets currently held by the
Manager or any Affiliate thereof, including the interest of the Manager in the
Existing Funds; (ii) any investments, securities or other assets acquired by or
in connection with (1) the Existing Funds to the extent they represent either an
investment which had been presented to the investors of an Existing Fund prior
to the date of this Agreement or an additional or "follow-on" investment in or
in connection with investments and/or limited partnerships in which an Existing
Fund held an interest prior to the date of this Agreement, or (2) (subject to
subsection (b) below) any new funds hereafter formed by the Manager or its
Affiliates; (iii) any investments, securities or other assets received in
exchange for, as a result of a merger, consolidation, conversion, exchange,
combination or other reorganization involving, or as distributions from
partnerships or other entities currently holding, investments, securities or
other assets referred to in clauses (i) and (ii) above; (iv) any personal
investments of the Principals and other Affiliates of the General Partner who
are natural persons hereafter made (A) other than the type described in the
following subclause (B), up to an aggregate amount of $500,000 per Principal and
other such Affiliate per year, or (B) in publicly traded securities, and
provided such personal investments are not (x) in an Equity- Linked Company in
which the Partnership has an Investment then outstanding hereunder, (y) a
Project Equity Company in which the Partnership has an Investment then
outstanding hereunder, an Affiliate of such Project Equity Company or assets
held by such Project Equity Company, or (z) any person to whom the Partnership
has a Mezzanine Loan then outstanding hereunder; (v) as provided in subsection
(c) below; and (vi) any investments approved by the Advisory Board. Without
limiting the foregoing, the determination as to whether an investment
opportunity appears to come within the scope of the Partnership's business shall
be made by the Manager in good faith; however, it is agreed that even if an
investment opportunity appears to come within the scope of the Partnership's
business, the Manager may make a good faith determination that it is not in the
best interests of the Partnership to place such investment opportunity with the
Partnership and, in such event, shall have the right and power to recommend such
investment opportunity to another party.

         (b) During the Primary Investment Period, the Manager and its
Affiliates shall not form or acquire a new investment fund for the same or
similar purpose for which the Partnership has been formed and cause such fund to
commence investment activities (a "SUBSEQUENT FUND"), unless the Manager or such
Affiliate receives the prior written approval of BOCP. If, in accordance with
the immediately preceding sentence and prior to the expiration of the Commitment
Period, the Manager organizes a Subsequent Fund, the Manager shall in good faith
equitably apportion any


                                      -11-
<PAGE>   15
prospective investment opportunities between the Partnership and the Subsequent
Fund, giving due consideration to the amount of the Unpaid Commitments, the
types of investments previously made by the Partnership, diversification
(geographic or otherwise) and other salient factors.

         (c) BOCP recognizes that the Manager serves as an investment advisor to
Energy Capital Investment Company PLC ("ECIC") pursuant to that certain
Investment Advisory Agreement dated as of February 4, 1994, and, subject to the
last sentence of this subsection (c), agrees that unless the Board of Directors
of ECIC elects not to participate in any Investment in Target Energy-Related
Assets or unless the Board of Directors of ECIC, the Manager, the EnCap Fund
Partnership and BOCP otherwise agree, the Partnership and ECIC will co-invest in
each investment opportunity selected by the Manager for the Partnership. BOCP
further recognize that in conjunction with the activities contemplated
hereunder, the Manager or an Affiliate (i) will organize EnCap Energy Capital
Fund III, L.P., a Texas limited partnership (the "ENCAP FUND PARTNERSHIP") and
(ii) may also organize one or more parallel investment entities to facilitate
participation by foreign and certain other investors in investment opportunities
of the type contemplated by the Partnership Agreement and hereunder (the EnCap
Fund Partnership and such other investment entities being herein called the
"PARALLEL INVESTMENT ENTITIES"); and, subject to the last sentence of this
subsection (c), BOCP agrees that such Parallel Investment Entities (whether one
or more and if organized) will co-invest in each investment opportunity selected
by the Manager for the Partnership. Notwithstanding the foregoing or anything
else herein to the contrary, BOCP and the Manager agree that (A) any
co-investment by the Partnership with ECIC and the Parallel Investment Entities
shall be on the same proportionate terms and conditions (including price of
Securities or loan amount, as applicable) as the co-investment made by ECIC and
the Parallel Investment Entities, including maturity dates and other maturity,
liquidation and distribution features, (B) the percentage amount of any
Investment allocated to ECIC shall not exceed 15%, (C) the Partnership's
percentage share of each Investment shall be equal to the product of A times B,
where "A" is 100% minus that percentage of the Investment allocated to ECIC, and
where "B" is a fraction, the numerator of which is the Unpaid Commitments then
available for investment by the Partnership in such Investment and the
denominator of which is the aggregate capital then available for investment in
such Investment by the Partnership and the Parallel Investment Entities, and (D)
the General Partner shall not organize any Parallel Investment Entity other than
(1) the EnCap Fund Partnership and (2) EnCap Energy Capital Fund III-B, L.P., a
Texas limited partnership organized for certain non-taxable investors and with a
subsidiary to acquire Project Equity Investments.

         (d) Subject to Section 3.2 and except as provided in subsections
(a),(b) and (c) above of this Section 3.3, the Manager or any Affiliate of the
Manager may engage or invest, directly or indirectly, in any business activity
or venture of any nature or description, including those that may be the same as
or similar to the Partnership's business and in direct competition therewith,
and the Manager or such Affiliate shall have no obligation to offer any such
business activity or venture to the Partnership. Except as otherwise expressly
provided in subsection (a) above and Sections 5.3 and 5.4, neither the
Partnership nor any partner thereof shall have any right, by virtue of this
Agreement or the relationship contemplated hereby, in such investments or such
other


                                      -12-
<PAGE>   16
activities or ventures, and such investments, activities or ventures, even if
the same or directly competitive with the business of the Partnership, shall not
be deemed wrongful or improper or in violation of this Agreement.

                                   ARTICLE IV

                          LIABILITY AND INDEMNIFICATION

         SECTION 4.1.  LIABILITY.

         (a) Neither the Manager, its Affiliates, their respective partners,
members, officers, directors, employees or agents, shall be liable, responsible,
or accountable in damages or otherwise to the BOCP or the Partnership for any
action taken or failure to act (EVEN IF SUCH ACTION OR FAILURE TO ACT
CONSTITUTED THE SOLE, CONCURRENT OR COMPARATIVE NEGLIGENCE OF THE MANAGER,
AFFILIATE, PARTNER, MEMBER, OFFICER, DIRECTOR, EMPLOYEE OR AGENT) in connection
with the operations, business and affairs of the Partnership and the performance
by the Manager of its duties and obligations hereunder, unless such act or
failure to act was the result of bad faith, fraud, willful or intentional
misconduct or criminal wrongdoing, gross negligence or a breach of a material
term of this Agreement.

         (b) The Manager may consult with legal counsel, accountants, petroleum
engineers, appraisers, investment bankers, and other consultants and advisers
selected by it with due care and any written opinion of any such person as to
matters which the Manager reasonably believes to be within such person's
professional or expert competence shall be full and complete authorization and
protection in respect of any action taken or omitted by the Manager hereunder in
good faith and in accordance with such opinion.

         (c) Subject to Section 4.1(c), the Manager may rely and shall be
protected in acting or refraining from acting upon any resolution, certificate,
statement, instrument, opinion, report, notice, request, consent, order, bond,
debenture, or other paper or document reasonably believed by it to be genuine
and to have been signed or presented by the proper party or parties.

         SECTION 4.2.  INDEMNIFICATION.

         (a) THE PARTNERSHIP SHALL INDEMNIFY AND SAVE HARMLESS THE MANAGER, ITS
AFFILIATES, AND THEIR RESPECTIVE MEMBERS, PARTNERS, OFFICERS, DIRECTORS,
EMPLOYEES AND AGENTS (IN THIS SECTION SOMETIMES INDIVIDUALLY CALLED AN
"INDEMNITEE") FROM ALL CLAIMS, CAUSES OF ACTION, JUDGEMENTS, LIABILITIES,
DAMAGES, CHARGES, FEES AND EXPENSES OF ANY KIND ARISING FROM THE OPERATIONS,
BUSINESS AND AFFAIRS OF THE PARTNERSHIP OR THE PERFORMANCE BY THE MANAGER OF ITS
DUTIES AND OBLIGATIONS HEREUNDER; PROVIDED, HOWEVER, THAT NO INDEMNITEE SHALL BE
INDEMNIFIED BY THE PARTNERSHIP FOR ANY ACTS OR OMISSIONS


                                      -13-
<PAGE>   17
BY THE INDEMNITEE THAT CONSTITUTE BAD FAITH, FRAUD, WILLFUL OR INTENTIONAL
MISCONDUCT OR CRIMINAL WRONGDOING, GROSS NEGLIGENCE OR A BREACH OF A MATERIAL
TERM OF THIS AGREEMENT. BOCP AND THE PARTNERSHIP RECOGNIZE THAT AN INDEMNITEE
MAY BE ENTITLED TO INDEMNIFICATION FROM ACTS OR OMISSIONS THAT MAY GIVE RISE TO
ORDINARY, CONCURRENT OR COMPARATIVE NEGLIGENCE.

         (b) Without limiting subsection (a) above, the Partnership shall pay or
reimburse expenses incurred by an Indemnitee in connection with the Indemnitee's
appearance as a witness or other participation in a proceeding involving or
affecting the Partnership at a time when the Indemnitee is not a named defendant
or respondent in the proceeding.

         (c) The indemnification provided by this Section shall be in addition
to any other rights to which each Indemnitee may be entitled under any agreement
or vote of the partners of the Partnership, as a matter of law or otherwise,
both as to action in the Indemnitee's capacity as the Manager or an officer,
director, member, employee or agent of the Manager or an Affiliate thereof or as
a person serving at the request of the Manager as set forth above and to action
in another capacity, and shall continue as to an Indemnitee who has ceased to
serve in such capacity and shall inure to the benefit of the heirs, successors,
assigns, administrators and personal representatives of the Indemnitees. Any
Indemnitee shall first seek recovery under any other indemnity or any insurance
policies by which such Indemnitee is indemnified or covered or from any issuer
in which the Partnership has an investment, as the case may be, prior to such
Indemnitee receiving any indemnification payment from BOCP or the Partnership.

         (d) An Indemnitee shall not be denied indemnification in whole or in
part under this Section because the Indemnitee had an interest in the
transaction with respect to which the indemnification applies if the transaction
was otherwise permitted and approved pursuant to the terms of this Agreement and
in the absence of fraud on behalf of the Indemnitee and its Affiliates.

                                    ARTICLE V

                          REIMBURSEMENT; MANAGEMENT FEE

         SECTION 5.1.  PAYMENT OR REIMBURSEMENT OF ORGANIZATION COSTS AND
OPERATING COSTS.

         (a) The Partnership shall pay, or shall reimburse the Manager or any
Affiliate thereof for its payment of, all out-of-pocket fees, costs and expenses
incurred by it in connection with the negotiation, execution and delivery of
this Agreement and all related documents.

         (b) The Partnership shall pay, or shall reimburse the Manager or any
Affiliate thereof for its payment of, all Operating Costs.



                                      -14-
<PAGE>   18
         (c) To the extent any Operating Costs or other costs are attributable
to any of the Partnership, a Parallel Investment Entity and ECIC, such costs
shall be allocated among such entities based on their respective (i) interests
in an Investment if such costs are attributable to such Investment or (ii)
aggregate amounts of capital agreed to be contributed and/or loaned to them by
their respective partners and Affiliates if such costs are not attributable to
any Investment.

         SECTION 5.2.  MANAGEMENT FEE.

         (a) During the period (in this Section 5.2(a) called the "INITIAL
PERIOD") commencing as of the date hereof and ending on the first to occur of
March 31, June 30, September 30 or December 31 following the earlier of (i) the
end of the Commitment Period, (ii) the point in time at which a Subsequent Fund
organized in accordance with the terms hereof makes its first investment, or
(iii) the occurrence of a Trigger Event (unless BOCP otherwise agrees in
writing), the Partnership shall pay to the Manager an annual fee equal to 2.0%
of the Total Commitments. After the expiration of the Initial Period, the
Partnership shall make quarterly payment to the Manager at a rate equal to 1.5%
per annum of the Base Amount (as defined below and, for any given payment,
determined as of the day immediately prior to the date such payment is due
hereunder). As used in this Section 5.2(a), the term "BASE AMOUNT" shall mean
(A) the sum of the aggregate Advances and Capital Contributions of the partners
under the Partnership Agreement as of the end of the Initial Period, increased
by (B) additional amounts advanced or contributed by the partners under the
Partnership Agreement to fund Follow-On Investments, and reduced by (but not
below zero) (C) amounts paid in respect of Advances or distributed to the
partners under the Partnership Agreement to the extent such amounts constitute a
return of capital and any writedown or writeoff of an Investment where the
Manager has determined that part or all of such Investment will not be repaid or
recouped by the Partnership. As used in this Section 5.2(a), "RETURN OF CAPITAL"
shall mean payments in respect of Advances or distributions that constitute
depletion, depreciation and amortization in the case of operating income from
Project Equity Investments and equity kickers related to Mezzanine Loans,
repayments of principal in the case of Mezzanine Loans, remaining cost basis in
the case of Investments sold or otherwise disposed of, and other applicable
customary returns of basis for any Investment, all as determined by the Manager
in good faith in accordance with (1) its customary accounting practices for
financial reporting purposes and (2) Section 7.1(a) of the Partnership
Agreement. The fee described in this Section 5.2(a) is herein called the
"MANAGEMENT FEE".

         (b) Except as provided below, payments of the Management Fee shall be
made quarterly in advance on each fee payment date of each year. The first
payment (i) shall be due on the Initial Funding Date for the period from the
date hereof up to but not including the next fee payment date, whichever will
first occur after the Initial Funding Date, and (ii) shall be prorated based on
the number of days in such period. On that fee payment date (whichever has first
occurred after the Initial Funding Date) and on each fee payment date
thereafter, the Management Fee for the next three-month period shall be due. As
used in this Section 5.2(b), the term "FEE PAYMENT DATE" shall mean January 1,
April 1, July 1 and October 1 of each year.



                                      -15-
<PAGE>   19
         SECTION 5.3.  TRANSACTION, BREAK-UP AND OTHER FEES.

         (a) The Manager or an Affiliate thereof shall be permitted to charge
and receive a transaction or similar fee (a "TRANSACTION FEE") in connection
with any Investment made by the Partnership hereunder, which Transaction Fee
shall be payable by the Portfolio Company (or, in the instance of a Project
Equity Company, the person with whom the Partnership has formed such Project
Equity Company); provided, however, that 50% of any Transaction Fee paid to and
received by the Manager or its Affiliates (as to the Partnership's proportionate
interest in such Investment) shall reduce on a dollar-for-dollar basis any
future payment of the Management Fee due and payable under Section 5.2;
provided, further, that if the Transaction Fee paid to and received by the
Manager or its Affiliate (as to the Partnership's proportionate interest in such
Investment) exceeds 2% of the funds committed by the Partnership with respect to
such Investment, such excess amount (to the extent it has not been used to
reduce the Management Fee pursuant to the preceding proviso) shall further
reduce on a dollar-for-dollar basis any future payment of the Management Fee due
and payable under Section 5.2.

         (b) Any fee, reimbursement, or other form of compensation in the nature
of a commitment or break-up or other arrangement payable to the Manager, an
Affiliate thereof or the Partnership (with respect to the Partnership's
proportionate interest in a proposed Investment) as a result of the failure to
consummate such investment by the Partnership hereunder (a "BREAK-UP FEE") shall
be paid or disbursed as follows: (i) first, to reimburse the Partnership or the
Manager for Operating Costs incurred in connection with the proposed
transaction; and (ii) second, any portion of the Break-up Fee remaining after
the reimbursement provided in clause (i) above shall be paid to the Manager or
its Affiliate; provided, however, that 50% of the amount paid to and received by
the Manager or its Affiliate (as to the Partnership's proportionate interest in
such Investment) shall reduce on a dollar-for-dollar basis any future payment of
the Management Fee due and payable under Section 5.2.

         (c) The Manager and its Affiliates shall be permitted to receive and
retain fees from any Portfolio Company in which the Partnership then has an
Investment (or otherwise paid by any Portfolio Company or any other person in
connection with an Investment in which the Partnership has an interest) for
providing advisory, investment banking, monitoring or directors' services
("CONSULTING FEES"); provided, however, that 100% of the amount of any such
Consulting Fees paid to and received by the Manager and its Affiliates (with
respect to the Partnership's proportionate interest in such Investment) shall
reduce on a dollar-for-dollar basis any future payment of the Management Fee due
and payable under Section 5.2.

         (d) All of the foregoing calculations relating to any Transaction Fee,
Break-up Fee or Consulting Fee shall be limited to the proportionate interest
that the Partnership has in any related Investment or proposed Investment, and
the foregoing provisions of this Section 5.3 shall not apply in any respect to
the proportionate interests that ECIC and the Parallel Investment Entities may
have in such Investment.



                                      -16-
<PAGE>   20
         SECTION 5.4.  CORPORATE FINANCE FEES.

         (a) The Management Fees payable to the Manager shall be reduced by an
amount (the "CORPORATE FINANCE FEE") for each CF Year equal to the product of A
times B times C, where "A" is 50%, where "B" is the Partnership Percentage, and
where "C" is the remainder of the Corporate Finance Profit for such CF Year
minus $2.5 million (or, with respect to the final CF Year, $2.5 million
multiplied by a fraction, the numerator of which is the number of days in the
final CF Year and the denominator of which is 365). The Manager and its
Affiliates shall be permitted to receive and retain the Corporate Finance Fee,
and the amounts so retained shall reduce on a dollar-for-dollar basis any future
payment of the Management Fee due and payable under Section 5.2.

         (b) As used in this Section 5.4, the following terms shall have the
respective meaning set forth below:

                   (i) "CF YEAR" shall mean each twelve-month period commencing
         on October 1 of each year and ending on September 30 of the following
         year that occurs during the period beginning October 1, 1997, and
         ending upon termination of the Commitment Period, provided that the
         final CF Year shall end upon termination of the Commitment Period.

                  (ii) "CORPORATE FINANCE ACTIVITIES" shall mean all advisory,
         consulting and other services rendered by the Manager and its
         Affiliates to third parties for a fee except those services where the
         Manager or its Affiliates are managing the investment of a fund or
         monies of a third party or are advising or consulting in connection
         therewith. Without limiting the foregoing, the Corporate Finance
         Activities shall not include (1) the activities or services of the
         Manager or its Affiliates relating to or in connection with any
         Existing Fund, the Partnership, any Parallel Investment Entity, any
         Subsequent Fund or any other fund or investment activity that is a
         successor (in terms of activities) to any of the foregoing, (2) any
         services or activities which were rendered or which occurred prior to
         the date of this Agreement, (3) any services or activities as to which
         the Manager or its Affiliates were engaged, or can reasonably
         demonstrate were in the process of being engaged, as of the date of
         this Agreement, (4) any investments made by the Manager or any of its
         Affiliates prior to the date of this Agreement, or (5) any investments
         made after the date of this Agreement by the Manager or any of its
         Affiliates for cash, exchange of property or other value except
         services.

                  (iii) "CORPORATE FINANCE PROFIT" shall mean for any CF Year
         the remainder of D minus E, where "D" is equal to all cash and non-cash
         revenues received by the Manager and its Affiliates during such CF Year
         from or as a direct consequence of their Corporate Finance Activities,
         and where "E" is equal to the General and Administrative Expenses paid
         by the Manager and its Affiliates during such CF Year with respect to
         their Corporate Finance Activities. In determining when revenues are
         received by the Manager and its Affiliates for the purposes of
         calculating the Corporate Finance Profit for any CF Year


                                      -17-
<PAGE>   21
         pursuant to this Section 5.4, (1) fees that are payable on a monthly or
         other periodic basis for services rendered for such month or period
         shall be considered to be received as of the end of the month to which
         they relate and (2) contingent, success, incentive and other fees that
         are payable on a contingent basis such as the closing of a transaction
         or financing or the occurrence of another event relating to the
         Manager's client or customer shall be considered to be received as of
         the date of such closing or occurrence of such event, in each case
         regardless of when such revenues or fees are actually received by the
         Manager or its Affiliate, but provided that no reduction in the
         Management Fee shall occur pursuant to Section 5.4(a) unless and until
         such fees are actually received by the Manager or its Affiliate.

                  (iv) "GENERAL AND ADMINISTRATIVE EXPENSES" shall mean (1) all
         direct costs and expenses paid by the Manager or its Affiliates with
         respect to their Corporate Finance Activities and (2) the portion of
         the in-house tax, accounting bookkeeping, engineering and similar types
         of costs and expenses, telephone, communications, secretarial,
         clerical, travel and entertainment expenses, office rent and other
         office expenses, depreciation, amortization, rental and repair expense
         of office and business equipment, salaries, benefits and other
         compensation expenses of consultants and employees (except the
         Principals), other direct and indirect administrative expenses and
         other costs and expenses that are necessary or appropriate to the
         conduct of the Corporate Finance Activities which are paid by the
         Manager or its Affiliates and are allocated to the Corporate Finance
         Activities by the Manager in a manner which is fair and reasonable and
         consistent with applicable generally accepted accounting principles and
         industry practices.

                  (v) "PARTNERSHIP PERCENTAGE" shall mean 85% of a fraction
         expressed as a percentage, the numerator of which is the Total
         Commitments and the denominator of which is the sum of the Total
         Commitments and the commitments of all partners of the Parallel
         Investment Entities to contribute capital and loan funds to the
         Parallel Investment Entities.

                                   ARTICLE VI

                    CERTAIN BANKING REGULATORY CONSIDERATIONS

         SECTION 6.1. REGULATORY LIMITATIONS. Notwithstanding Article II or
Article III or anything else herein to the contrary, the Manager shall not cause
the Partnership to participate in any Investment or exercise any right, duty or
election provided for in this Agreement or under the terms of any Investment, to
the extent that such participation or exercise would, or might be reasonably be
foreseen to, cause or result in a Regulatory Limitation with respect to a Banc
One Entity. As used in this Section 6.1, the term "REGULATORY LIMITATION" shall
mean any set of facts or circumstances wherein or whereby (a) it has been
asserted (or BOCP reasonably believes that there is a risk of assertion) by any
governmental authority that the Partnership is not entitled to participate in an
Investment or exercise any such right, duty or election with respect to all or
any portion of such Investment, or that any such participation or exercise by
the Partnership with


                                      -18-
<PAGE>   22
respect to all or any portion of such Investment would cause or result in a
violation by or imposition of a material cost upon a Banc One Entity under any
Applicable Regulation (as defined in Section 6.6); (b) the Banc One Entities are
deemed, individually or in the aggregate, to own, hold, control or have power
(including voting power) over a greater quantity of Securities than are
permitted under the Applicable Regulations; or (c) the Manager reasonably
believes that any such participation or exercise by a Banc One Entity could
result in the imposition of a material cost or expense, or expose a Banc One
Entity to review or inquiry by any governmental authority, under the Applicable
Regulations.

         SECTION 6.2. VOTING POWER. Notwithstanding Article II or Article III or
anything else herein to the contrary, the Manager shall not, without the prior
written consent of BOCP, cause the Partnership to participate in any Investment
or exercise any right, duty or election provided for in this Agreement or under
the terms of any Investment, to the extent that such participation or exercise
would, or might be reasonably be foreseen to, cause or result in the Partnership
(together with the Banc One Entities) to have (or be deemed to have) more than
4.99% of the voting power to elect the board of directors or similar management
board of any entity related to such Investment.

         SECTION 6.3. EQUITY OWNERSHIP. Notwithstanding Article II or Article
III or anything else herein to the contrary, the Manager shall not cause the
Partnership to participate in any Investment or exercise any right, duty or
election provided for in this Agreement or under the terms of any Investment, to
the extent that such participation or exercise would, or might be reasonably be
foreseen to, cause or result in the Partnership (together with the Banc One
Entities) to beneficially own (or be deemed to beneficially own) more than
24.99% of the aggregate equity or capital of any entity related to such
Investment.

         SECTION 6.4. DISPOSITION OF INVESTMENT. Notwithstanding anything in
this Agreement to the contrary, if any time BOCP determines (and delivers to the
Manager an opinion of legal counsel, which may be a reasoned opinion expressed
on the basis of a "more likely than not" standard to the effect) that the
ownership or control of an Investment previously acquired by the Partnership
under this Agreement is or is reasonably likely to cause or result in (a) a
violation by or an imposition of a material cost upon a Banc One Entity under
any Applicable Regulation or (b) the Banc One Entities are deemed, individually
or in the aggregate, to own, hold, control or have power (including voting
power) over a greater quantity of Securities than are permitted under the
Applicable Regulations, BOCP shall have the right to give written notice thereof
to the Manager requesting that the Manager cause the Partnership to make a full
or partial disposition of such Investment to the extent necessary to enable the
Banc One Entities to comply with such Applicable Regulations. If any such notice
from BOCP is given to the Manager, the Manager shall have a period of 90 days
following receipt of such notice and legal opinion to use its reasonable best
efforts to (i) eliminate the necessity for such disposition by correction of the
condition giving rise to the violation of the Regulatory Limitation (to the
extent such correction is reasonably within the control of the Manager), (ii)
obtain a ruling or exemption from the appropriate regulatory authority
eliminating the necessity for such disposition, (iii) arrange for the
disposition of the required


                                      -19-
<PAGE>   23
portion of the Investment at a price equal to the fair market value thereof
(including a disposition to the Manager or an Affiliate thereof), or (iv)
arrange for another method to eliminate the necessity of the disposition that is
reasonably satisfactory to BOCP. If the event that the necessity to dispose all
or a part of an Investment is not eliminated within such 90-day period or such
longer period as BOCP and the Manager shall agree, the Manager shall reasonably
cooperate with BOCP to assist it in effecting such disposition.

         SECTION 6.5. INFORMATION. The Manager shall, upon written request
therefor, furnish to BOCP or its designated representative all information
concerning any Investment reasonably necessary in order to enable the Banc One
Entities to assess compliance with the Applicable Regulations or to prepare or
furnish any information requested or required by the FRB, OCC, SEC or the NASD
in connection with the Partnership's participation in such Investment.

         SECTION 6.6. APPLICABLE REGULATIONS AND OTHER DEFINITIONS. As used in
this Article VI, (a) "APPLICABLE REGULATIONS" shall mean the Bank Holding
Company Act and the regulations promulgated thereunder by the Board of Governors
of the FRB, the National Bank Act and the regulations promulgated thereunder by
the OCC, the Securities and Exchange Act of 1934 and the regulations promulgated
thereunder by the SEC with respect to broker-dealers, and the By-Laws and Rules
of Fair Practice promulgated by the NASD, (b) the "FRB" shall mean the Board of
Governors of the Federal Reserve System, (c) the "OCC" shall mean the Office of
the Comptroller of the Currency, (d) the "SEC" shall mean the Securities and
Exchange Commission, (e) the "NASD" shall mean the National Association of
Securities Dealers, Inc. and (f) the "BANC ONE ENTITIES" shall mean Banc One
Corporation, Banc One Capital Corporation, the Partnership or any of their
respective Affiliates.

                                   ARTICLE VII

                      CERTAIN EVENTS CONCERNING PRINCIPALS

         Upon the occurrence of a Trigger Event (as defined below), and for the
remainder of the Commitment Period (in this Section called the "TRIGGER EVENT
PERIOD"), without the written consent of BOCP, the Manager shall not cause the
Partnership to make or purchase any Investments other than (a) Investments with
respect to which the Partnership was, at the time of the Trigger Event,
contractually obligated to make, (b) acquiring any Securities issued as a
dividend on, in a reclassification with respect to, or in exchange for
Securities that the Partnership owns at such time, or (c) acquiring or receiving
any equity kicker or similar consideration in connection with a Mezzanine Loan
previously made by the Partnership. During the Trigger Event Period and
thereafter and except as provided above in this Article VII, the Manager shall
continue to manage the Investments and other assets owned by the Partnership at
that time and shall continue to have all of the rights and powers that it would
have otherwise had with respect to such Investments or other assets as if a
Trigger Event had not occurred. As used in this Article VII, the term "TRIGGER
EVENT" shall mean either (i) two or more of the Designated Principals cease to
be involved in the day-to-day operation of the Manager because of retirement,
termination, death, disability or any


                                      -20-
<PAGE>   24
other reason, or (ii) the sale or other transfer of voting securities or equity
interests in the Manager such that immediately after the last such sale or
transfer Principals who are employees of the Manager no longer own, either
directly or indirectly, 50% or more of the voting securities or equity interests
in the Manager.

                                  ARTICLE VIII

                    REPORTING; BANKING; AND CONFIDENTIALITY

         SECTION 8.1.  REPORTS.  The Manager shall furnish to BOCP the
following reports and other information at the respective times indicated:

         (a) within 60 days after the end of each quarter, a report or reports
which (i) sets forth a description of each Investment made by the Partnership
during such quarter, (ii) contains a list of each Investment of the Partnership
as of the end of such quarter and the cost or fair market value of such
Investment as of such date as estimated by the Manager based on the most recent
engineering information in the possession of the Manager with respect to such
Investment, (iii) summarizes the performance of each Investment of the
Partnership for such quarter and identifies any material variances from any
projections or plans previously furnished to BOCP for such Investment and (iv)
contains a current valuation of BOCP's allocable share of Partnership assets, as
estimated by the Manager based on the most recent engineering information in the
possession of the Manager with respect to each Investment of the Partnership;

         (b) within 60 days after the end of each quarter, detail of any items
that occurred during such quarter which offset the Management Fee pursuant to
Sections 5.3 and 5.4;

         (c) within 120 days after the end of each fiscal year of the
Partnership, (i) a report or reports which shall discuss and review the status
of each Investment and its performance for such year and (ii) a schedule showing
the calculation of the Corporate Finance Fee for most recent CF Year (as defined
in Section 5.4);

         (d) promptly upon the request of BOCP (and subject to Section 8.3),
such information concerning the Partnership or any of its Investments as BOCP
may reasonably request and which the Manager can provide without unreasonable
effort; and

         (e) such other reports and information as the Manager may determine
from time to time.

         SECTION 8.2. BANK ACCOUNTS. Notwithstanding anything in the Partnership
Agreement to the contrary, the Manager shall cause one or more accounts to be
maintained in a bank or banks, each having capital and surplus accounts totaling
not less than $500,000,000, which accounts shall be used for the payment of the
expenditures incurred by the Partnership in connection with the business of the
Partnership, and in which shall be deposited any and all receipts of the
Partnership. The Manager shall determine the number of and the persons who will
be authorized as signatories


                                      -21-
<PAGE>   25
on each such bank account. There shall not be deposited in any of such accounts
any funds other than the funds belonging to the Partnership, and no other funds
shall in any way be commingled with such funds, except the Manager may use one
bank account for the Partnership, the Parallel Investment Entities and ECIC for
the purpose of paying money to, and receiving payments of money from, Portfolio
Companies. All funds of the Partnership in excess of $1,000,000 on hand at any
time and not invested in any Portfolio Companies (and not pending anticipated
investment within 30 days) shall be invested only in United States government
securities having a remaining maturity of one year or less, repurchase
agreements secured by such government securities or government guaranteed
securities of like remaining maturity, commercial paper rated A-1 or better by
Standard and Poor's Corporation, or other time deposits or bankers acceptances
with any bank meeting the minimum capital and surplus requirements stated above.

         SECTION 8.3. CONFIDENTIALITY. Except as may be required by applicable
law or valid subpoena or other lawful process or by the rules of any applicable
stock exchange or other self-regulatory body or other regulatory requirements,
BOCP agrees that it will (consistent with its reasonable practices and
procedures adopted in good faith for handling confidential information) keep
confidential all written information furnished to it by the Manager which the
Manager reasonably believes should be kept confidential and which the Manager
clearly designates thereon as "confidential" and will not disclose any such
information to any person whatsoever (other than BOCP's officers, directors,
employees, beneficial owners, attorneys, accountants, advisors or potential
transferees (provided each of such persons is informed of the confidential
nature of such information) or the Manager or an investor in ECIC or a Parallel
Investment Entity); provided, however, that the foregoing covenant of BOCP shall
not apply to any information that (a) was or becomes generally available to the
public other than as a result of disclosure by BOCP, (b) becomes available to
BOCP from a source other than the Manager or an Affiliate thereof, provided that
such source is not (to the knowledge of BOCP) bound by a confidentiality
agreement with the Manager or such Affiliate or (c) BOCP can establish was
within it's possession prior to it being furnished to BOCP by or on behalf of
the Manager or an Affiliate thereof, provided that the source of such
information was not (to the knowledge of BOCP) bound by a confidentiality
agreement with the Manager or any of its Affiliates in respect thereof (the
information described above which BOCP is required to maintain as confidential
hereunder being called in this Article VIII "CONFIDENTIAL INFORMATION"). If BOCP
is compelled by law, subpoena, legal process, rules of any stock exchange or any
other self-regulatory body, or regulatory requirements to disclose any
Confidential Information with which BOCP reasonably believes it is legally
obligated to comply, BOCP shall use its reasonable best efforts to give prompt
notice of such fact to the Manager so that the Manager may, if it so desires,
seek a protective order or other governmental or judicial relief at Partnership
expense to prevent disclosure of such Confidential Information; provided,
however, that no such notice shall be required in connection with any routine or
periodic examination or similar process by any regulatory or self-regulatory
body or authority. BOCP acknowledges and agrees that instances may arise when
the Manager or an Affiliate thereof is subject to and may comply with a valid
and effective agreement with a third party prohibiting the Manager or such
Affiliate from distributing or otherwise disseminating to another party (e.g.,
BOCP) certain information, such as geological, geophysical or other data
pertaining to Target Energy-Related Assets with respect


                                      -22-
<PAGE>   26
to which the Manager desires for the Partnership to make an Investment hereunder
or the Partnership has made an Investment hereunder. If requested by BOCP, the
Manager shall use its reasonable best efforts to obtain an amendment or waiver
of any such agreement to permit any such data to be provided to BOCP upon the
execution by BOCP of a similar agreement and in any event shall attempt in
advance of such execution of any such agreement to obtain permission for BOCP to
receive such information.

         SECTION 8.4. BOCP REPORTS. The Manager agrees to use its reasonable
best efforts to provide to BOCP such information as BOCP shall reasonably and
timely request in order for BOCP to timely fulfill its reporting
responsibilities under its limited liability company governing documents.

                                   ARTICLE IX

                                      TERM

         This Agreement shall commence as of the date hereof and shall continue
until the termination of the Partnership for state law purposes, unless sooner
terminated upon the occurrence of any of the following events:

         (a)      The consent in writing of the parties hereto.

         (b)      The Manager:

                  (i)   makes a general assignment for the benefit of
         creditors;

                  (ii)  files a voluntary bankruptcy petition;

                  (iii) becomes the subject of an order for relief or is
         declared insolvent in any federal or state bankruptcy or insolvency
         proceeding;

                  (iv) files a petition or answer seeking for the Manager a
         reorganization, arrangement, composition, readjustment, liquidation,
         dissolution, or similar relief under any law;

                  (v) files an answer or other pleading admitting or failing to
         contest the material allegations of a petition filed against the
         Manager in a proceeding of the type described in subsection (i) through
         (iv) above;

                  (vi) seeks, consents to, or acquiesces in the appointment of a
         trustee, receiver, or liquidator of the Manager or of all or any
         substantial part of the Manager's properties; or



                                      -23-
<PAGE>   27
                  (vii) 120 days expire after the date of the commencement of a
         proceeding against the Manager seeking reorganization, arrangement,
         composition, readjustment, liquidation, dissolution, or similar relief
         under any law if the proceeding has not been previously dismissed, or
         90 days expire after the date of the appointment, without the Manager's
         consent or acquiescence, of a trustee, receiver, or liquidator of the
         Manager or of all or any substantial part of the Manager's properties
         if the appointment has not been vacated or stayed, or 90 days expire
         after the date of expiration of a stay, if the appointment has not
         previously been vacated.

         (c) BOCP terminates this Agreement for cause. As used in this Article
IX, the term "FOR CAUSE" shall mean (i) the commission of criminal misconduct,
fraud, willful or intentional misconduct, gross negligence or a material
violation of applicable securities laws by the Manager or any officer, director
or member thereof, or (ii) a material breach by the Manager of any of its duties
or obligations hereunder, or any of its material representations made herein,
which breach is not cured within 60 days after receipt by the Manager of a
written notice from BOCP (provided, that if such breach is not reasonably
susceptible to cure within such 60-day period and if the Manager is diligently
and in good faith taking action to cure such breach, such 60-day period shall be
extended for the period of time reasonably necessary for the Manager to cure
such breach, not to exceed 120 days).

                                    ARTICLE X

                           RELATIONSHIP OF THE PARTIES

         Notwithstanding anything in this Agreement to the contrary, (a) the
relationship of the Manager to BOCP and the Partnership shall be and remain that
of an independent contractor; (b) neither the Manager nor any member, officer,
employee or agent thereof shall be deemed to be an employee of BOCP or the
Partnership by virtue of this Agreement; (c) nothing contained herein shall be
deemed or construed to create a partnership between BOCP or the Partnership, on
the one hand, and the Manager, on the other hand, or to cause any party hereto
to be responsible in any way for the debts or obligations of any other party
hereto; and (d) nothing contained herein shall be deemed or construed (i) to
constitute an assignment of BOCP's interest as a general partner in the
Partnership to the Manager or (ii) to cause the Manager to be a general partner
of the Partnership or have the liabilities of a general partner in a limited
partnership.

                                   ARTICLE XI

                              AMENDMENTS; MEETINGS

         SECTION 11.1.     AMENDMENTS.  This Agreement may be changed,
modified, or amended only by an instrument in writing duly executed by BOCP, the
Partnership and the Manager.



                                      -24-
<PAGE>   28
         SECTION 11.2.     MEETINGS.

         (a) Commencing with calendar year 1998 and in each calendar year
thereafter until the termination of the Partnership, an annual meeting among the
Manager, BOCP and the investors in the Parallel Investment Entities shall be
held. Such annual meetings shall be at such time and place as the Manager shall
determine, except that the first annual meeting shall be held within one year
following the date of this Agreement. Notice of each annual meeting, setting
forth the time and the place thereof, shall be delivered to BOCP not less than
30 days prior to the meeting date. At each such annual meeting, the Manager
shall discuss with BOCP and the investors in the Parallel Investment Entities
the operations, business and affairs of the Partnership and the Parallel
Investment Entities. The costs and expenses incurred by BOCP of traveling to and
attending the annual meeting shall be the responsibility of BOCP (and shall not
be the obligation of the Partnership or the Manager), except that the
Partnership and the Parallel Investment Entities shall provide at their expense
suitable meeting facilities (which expense shall be deemed an Operating Cost).

         (b) The Manager shall cause the Designated Principals shall make
themselves available to respond to BOCP's requests for information.

                                   ARTICLE XII

                                 ADVISORY BOARD

         (a) The Manager shall, promptly following the last of the dates
provided in the respective agreements governing the Parallel Investment Entities
as of which additional investors can no longer be admitted to any such entity,
select and form an "ADVISORY BOARD" (as herein called), which shall consist of
at least three but not more than five individuals who are representatives of
BOCP and of investors (excluding the General Partner or an Affiliate thereof) in
any Parallel Investment Entity; provided, however, that no single Eligible
Investor shall have more than one representative serving on the Advisory Board
at any one time; and provided, further, that one member of the Advisory Board
shall at all times be a limited partner of the EnCap Fund Partnership and a
second member of the Advisory Board shall at all times be a limited partner of
EnCap Energy Capital Fund III-B, L.P. The initial members of the Advisory Board
shall serve until December 31, 1998. As of January 1 of each year thereafter,
the Manager shall nominate a new Advisory Board which must be approved in
writing by a majority in interest of BOCP and the investors in each Parallel
Investment Entity voting as a single group (based on the amounts of their
respective agreements to contribute and/or loan capital to the Partnership or a
Parallel Investment Entity and excluding any vote by the General Partner) and
which shall serve for the remainder of such calendar year and until the
successor board has been so approved. Any vacancy arising on the Advisory Board
shall be filled by the Manager. Any member of the Advisory Board may be removed
at any time, with or without cause, by written consent signed by the 66 2/3% in
interest of BOCP and the investors in each Parallel Investment Entity as a
single group (based on the amounts of their respective agreements to contribute
and/or loan capital to the Partnership or


                                      -25-
<PAGE>   29
a Parallel Investment Entity and excluding any vote by the General Partner). Any
member of the Advisory Board may, by written notice to the Manager, appoint an
alternate to act for such member in his or her absence and/or at any meeting of
the Advisory Board.

         (b) The functions of the Advisory Board shall be (i) to resolve any
questions relating to a conflict of interest or a potential conflict of interest
between the Manager or any of its Affiliates, on one hand, and the Partnership,
BOCP, a Parallel Investment Entity, or the investors therein, on the other hand,
and to approve any contract or other transaction between the Partnership and a
Parallel Investment Entity, on the one hand, and the Manager or an Affiliate
thereof, on the other hand; (ii) to consult with and advise the Manager on such
other matters, including investment strategy, about which the Manager may from
time to time, in its sole discretion, determine to consult with the Advisory
Board; (iii) to review with the Manager the annual operating budgets of the
Partnership and the Parallel Investment Entities; (iv) to approve each
determination of Market Value which is used in the calculation of Preferred
Return Payout or Catch-Up Payout; and (v) to approve such other matters and
perform such other functions as are provided for in this Agreement and/or in any
agreements governing a Parallel Investment Entity; provided, that the functions
and activities of the Advisory Board and each member thereof acting in such
capacity shall be limited to those permitted under Section 3.03(b) of the Act
for limited partners who are deemed not to participate in the control of the
business of a partnership. The approval of the Advisory Board of any conflict,
potential conflict or transaction pursuant to subsection (i) above in this
Section shall constitute the approval thereof or the consent thereto by BOCP as
required pursuant to, or for purposes of, Section 2.2 or elsewhere in this
Agreement.

         (c) The Advisory Board shall have the authority to adopt rules and
procedures, not inconsistent with this Agreement or the agreement governing each
Parallel Investment Entity, relating to the conduct of its affairs; provided,
however, that (i) in any event such rules and procedures shall include the
requirement that each member shall be required to recuse himself from voting on
any matter being considered by the Advisory Board for which such member (or the
investor represented by such member) has a conflict of interest, (ii) except
when a greater number is required elsewhere in this Agreement, all approvals,
disapprovals, and other actions taken by the Advisory Board shall be authorized
by a majority in number of the members of the Advisory Board then holding office
and eligible to vote on the matter being considered, and (iii) except as
provided in subsection (b) above, in no event shall the Advisory Board (or any
member thereof) have the power to bind the Partnership, BOCP, the Parallel
Investment Entities, or the investors in each Parallel Investment Entity, or the
authority to act for or on behalf of any of them. Without expanding the terms of
subsection (b) above, the Manager shall, if requested by the Advisory Board,
meet with or otherwise make itself reasonably available to, the Advisory Board
on a quarterly basis and at a mutually convenient time.

         (d) The members of the Advisory Board shall exercise their best
judgment in carrying out their functions. Each member of the Advisory Board,
BOCP and each investor in a Parallel Investment Entity associated with a member
of the Advisory Board and their respective Affiliates shall be indemnified to
the extent set forth in the respective agreements governing the Partnership


                                      -26-
<PAGE>   30
and the Parallel Investment Entities, except that the expense of such indemnity
shall be borne in the manner provided in Section 5.1(c).

         (e) The Advisory Board will serve without compensation. The
Partnership, however, will reimburse all reasonable out-of-pocket expenses of
any member representing the Partnership incurred in attending meetings and
otherwise as a result of their service on the Advisory Board. Such reimbursement
shall be borne in the manner provided in Section 5.1(c).

                                  ARTICLE XIII

                                  MISCELLANEOUS

         SECTION 13.1. NOTICES. All notices, demands, requests, or other
communications required or permitted to be given pursuant to this Agreement
shall be in writing and shall be given either (a) by hand delivery, (b) by
United States mail, certified or registered, return receipt requested, postage
prepaid, (c) by electronic facsimile or (d) by overnight courier service
(charges prepaid) with proof of delivery. Each party's address for notices and
other communications hereunder shall be that set forth below such party's
signature hereto. Each party hereto may change its address for notices and
communications by giving notice in writing to the other party, stating its new
address for notices, in accordance with this Section 13.1. Notices sent by hand
delivery shall be deemed to have been given when received; notices mailed in
accordance with the foregoing shall be deemed to have been given five Business
Days following the date mailed; notice sent by electronic facsimile shall be
deemed given on the first Business Day after electronically confirmed; and
notices sent by overnight courier service shall be deemed to have been given on
the next Business Day following the date so sent.

         SECTION 13.2. ENTIRE AGREEMENT. This Agreement, the Subscription
Agreement pursuant to which the General Partner subscribes for its interest as a
general partner of the Partnership, the Partnership Agreement and the Assignment
Agreements (as described in Exhibit 13.8) constitute the full and complete
agreement of the parties hereto with respect to the subject matter hereof and
supersede and replace any description or summary of terms contained in the
offering materials or other writings provided to prospective investors in the
Encap Fund Partnership or any discussions concerning the subject matter hereof.

         SECTION 13.3. SEVERABILITY. If any provision of this Agreement is held
to be unenforceable, this Agreement shall be considered divisible and such
provision shall be deemed inoperative to the extent it is deemed unenforceable,
and in all other respects this Agreement shall remain in full force and effect;
provided, however, that if any such provision may be made enforceable by
limitation thereof, then such provision shall be deemed to be so limited and
shall be enforceable to the maximum extent permitted by applicable law.



                                      -27-
<PAGE>   31
         SECTION 13.4. NO WAIVER. The failure of any party to insist upon strict
performance of a covenant hereunder or of any obligation hereunder, irrespective
of the length of time for which such failure continues, shall not be a waiver of
such party's right to demand strict compliance in the future. No consent or
waiver, express or implied, to or of any breach or default in the performance of
any obligation hereunder shall constitute a consent or waiver to or of any other
breach or default in the performance of the same or any other obligation
hereunder.

         SECTION 13.5.  APPLICABLE LAW. This Agreement and the rights and
obligations of the parties hereunder shall be governed by and interpreted,
construed and enforced in accordance with the laws of the State of Texas.

         SECTION 13.6. SUCCESSORS AND ASSIGNS. This Agreement shall be binding
upon and inure to the benefit of the parties hereto and their respective heirs,
legal representatives, successors and assigns; provided, however, that no party
hereto may assign, transfer or otherwise dispose of all or any part of its
rights, duties or obligations hereunder without the consent of the other party.

         SECTION 13.7.  ATTORNEYS' FEES.  Subject to Section 5.1(a), each party
agrees to pay any attorneys' fees or expenses incurred by it in connection with
the negotiation, execution and delivery of this Agreement.

         SECTION 13.8. RELATED AGREEMENTS. Except for the documents and other
instruments listed in Exhibit 13.8, the Manager shall not enter into any side
letter or similar written agreement with any existing or future investor in any
Parallel Investment Entity that has the effect of establishing rights in or with
respect to such Parallel Investment Entity or otherwise benefitting such
investor in a manner in or with respect to such Parallel Investment Entity more
favorable in any material respect to such investor than the rights and benefits
established in or with respect to the Partnership in favor of BOCP by the
Partnership Agreement and this Agreement unless, in any such case, BOCP has been
offered the opportunity to receive such rights and benefits of such side letter
or similar written agreement.

         SECTION 13.9. NO THIRD PARTY BENEFICIARIES. Except as expressly and
specifically provided in Section 4.2, nothing in this Agreement, either express
or implied, is intended to or shall confer upon any person other than the
parties hereto, and their respective successors and permitted assigns, any
rights, benefits or remedies of any nature whatsoever under or by reason of this
Agreement.

         SECTION 13.10.  COUNTERPARTS.  This Agreement may be executed in one
or more counterparts, each of which shall be an original and all of which shall
constitute but one and the same document.

         SECTION 13.11. REPRESENTATIONS AND WARRANTIES OF THE MANAGER. The
Manager represents, warrants and covenants to BOCP and the Partnership as
follows:



                                      -28-
<PAGE>   32
         (a) The Manager is a limited liability company duly organized, validly
existing and in good standing under the laws of the State of Texas.

         (b) The Manager has the requisite power and authority to execute and
deliver this Agreement and the Partnership Agreement and to perform its
respective obligations hereunder and thereunder.

         (c) The execution, delivery and performance by the Manager of this
Agreement and the Partnership Agreement have been duly and validly authorized,
and no other action is required to be taken to authorize such execution,
delivery and performance.

         (d) The execution, delivery and performance by the Manager of this
Agreement and the Partnership Agreement are within the powers of the Manager and
will not be in contravention of or result in any breach or constitute a default
under any applicable law, rule or regulation or any loan, note or other
agreement or instrument to which the Manager is a party or by which it or any of
its properties are bound.

         (e) This Agreement and the Partnership Agreement have been duly and
validly executed and are binding and enforceable as against the Manager.

         (f) Except for a change of law over which the Manager has no control
(and the Manager shall immediately notify BOCP when the Manager learns of such
occurrence), the foregoing representations, warranties and covenants shall
remain true and accurate during the term of this Agreement, and the Manager will
neither take action nor permit action to be taken which would cause any of the
foregoing representations to become untrue or inaccurate.

         (g) No consent, approval, authorization or order of any court or
governmental agency or authority or of any third party which has not been
obtained is required in connection with the execution, delivery and performance
by the Manager of this Agreement or the Partnership Agreement.

         (h) To the best knowledge of the Manager, the Manager and its
Affiliates and persons acting on their behalf have not taken any action, or
failed to take any action, which has caused the organization of the Partnership
and the issuance of the interests in the Partnership to come within the
registration requirements of the Securities Act of 1933, as amended, or any
applicable state blue sky laws. The offer and sale by the Manager of partnership
interests in the Partnership and in the Parallel Investment Entities has been
and will be made only to investors who represent to the Manager that they were
or are, as applicable, "accredited investors" within the meaning of Regulation D
of the Securities Act of 1933, as amended. Neither the Manager, directly or
indirectly, nor any agent acting on its behalf has offered or will offer such
interests or any similar security to any person so as to bring the issuance and
sale of such interests within the registration requirements of such Act.



                                      -29-
<PAGE>   33
         (i) To the best of the Manager's knowledge, the private placement
memorandum, prepared with respect to the Partnership and the Parallel Investment
Entities and distributed to BOCP and the investors in the Parallel Investment
Entities by the Manager and/or Donaldson, Lufkin & Jenrette Securities
Corporation, did not, as of the date it was prepared, contain any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements therein not misleading (other than facts which are recognized to
be industry risks normally associated with the oil and gas business); provided,
however, that the terms and provisions of this Agreement, the Partnership
Agreement and the agreements governing the Parallel Investment Entities
supersede in all respects the terms described in such memorandum for the
Partnership and the Parallel Investment Entities.

         SECTION 13.12. REPRESENTATIONS AND WARRANTIES OF BOCP AND THE
PARTNERSHIP. Each of BOCP and the Partnership severally represent, warrant and
covenant to the Manager as follows:

         (a) It is an entity duly organized, validly existing and in good
standing under the laws of the State of its formation.

         (b) It has the requisite power and authority to execute and deliver
this Agreement and to perform its respective obligations hereunder.

         (c) The execution, delivery and performance by it of this Agreement
have been duly and validly authorized, and no other action is required to be
taken to authorize such execution, delivery and performance.

         (d) The execution, delivery and performance by it of this Agreement are
within its powers and will not be in contravention of or result in any breach or
constitute a default under any applicable law, rule or regulation or any loan,
note or other agreement or instrument to which it is a party or by which it or
any of its properties are bound.

         (e) This Agreement has been duly and validly executed and is binding
and enforceable against it.

         (f) Except for a change of law over which it has no control (and it
shall immediately notify the Manager when it learns of such occurrence), the
foregoing representations, warranties and covenants shall remain true and
accurate during the term of this Agreement, and it will neither take action nor
permit action to be taken which would cause any of the foregoing representations
to become untrue or inaccurate.

         (g) No consent, approval, authorization or order of any court or
governmental agency or authority or of any third party which has not been
obtained is required in connection with the execution, delivery and performance
by it of this Agreement.



                                      -30-
<PAGE>   34
         SECTION 13.13. SURVIVAL OF REPRESENTATIONS AND WARRANTIES. All
representations, warranties and covenants made by the parties hereto in this
Agreement or any other document contemplated hereby shall be considered to have
been relied upon by the other parties hereto and shall survive the execution and
delivery of this Agreement, or such other document, regardless of any
investigation made by or on behalf of any such party.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]



                                      -31-
<PAGE>   35
         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
day and year first above written.


                                    BANC ONE CAPITAL PARTNERS VIII, LTD.


                                    By:
                                       ---------------------------------------
                                    Name:
                                         -------------------------------------
                                    Title:
                                          ------------------------------------


                                    ADDRESS FOR NOTICE PURPOSES:

                                    Banc One Capital Partners VIII, Ltd.
                                    150 E. Gay Street, 24th Floor
                                    Columbus, Ohio 43215
                                    Fax No.: (614)217-0180
                                    Attention:
                                              --------------------



SIGNATURE PAGE--MANAGEMENT AGREEMENT

<PAGE>   36



         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year first above written.


                                    BOCP ENERGY PARTNERS, L.P.


                                    By: BANC ONE CAPITAL PARTNERS VIII,
                                             LTD., General Partner


                                    By:
                                       ---------------------------------------
                                    Name:
                                         -------------------------------------
                                    Title:
                                          ------------------------------------


                                    ADDRESS FOR NOTICE PURPOSES:

                                    BOCP Energy Partners, L.P.
                                    150 E. Gay Street, 24th Floor
                                    Columbus, Ohio 43215
                                    Fax No.: (614)217-0180
                                    Attention:
                                              --------------------



SIGNATURE PAGE--MANAGEMENT AGREEMENT



<PAGE>   37

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year first above written.


                                    ENCAP INVESTMENTS L.C.


                                    By:
                                       ---------------------------------------
                                    Name: Robert L. Zorich
                                    Title: Managing Director


                                    ADDRESS FOR NOTICE PURPOSES:

                                    EnCap Investments L.C.
                                    1100 Louisiana, Suite 3150
                                    Houston, Texas 77002
                                    Fax No.: (713)659-6130
                                    Attention: Robert L. Zorich




SIGNATURE PAGE--MANAGEMENT AGREEMENT




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