ALLIANCE RESOURCES PLC
SC 13D, 1998-11-09
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*


                             Alliance Resources PLC
                                (Name of Issuer)

                      Ordinary Shares, of (pound) 0.01 each
                         (Title of Class of Securities)


                                  G80000181445
                                 (CUSIP Number)

                                Robert L. Zorich
                             EnCap Investments 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)

                                October 30, 1998
                      (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 Sections 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 Sections 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. G80000181445             SCHEDULE 13D


(1)   Names of Reporting Persons I.R.S. Identification Nos. of Above Persons

            ENERGY CAPITAL INVESTMENT COMPANY PLC
- --------------------------------------------------------------------------------

(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)                         WC (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    ENERGY CAPITAL INVESTMENT COMPANY
                                              PLC IS A COMPANY FORMED UNDER THE
                                              LAWS OF THE COUNTRY OF ENGLAND
- --------------------------------------------------------------------------------

                    (7)      Sole Voting Power                                 0
      Number of     ------------------------------------------------------------
      Shares Bene-
      ficially      (8)      Shared Voting Power                    3,750,000(1)
      Owned by      ------------------------------------------------------------
      Each
      Reporting     (9)      Sole Dispositive Power                            0
      Person With   ------------------------------------------------------------

                    (10)     Shared Dispositive Power               3,750,000(1)
- --------------------------------------------------------------------------------

(11)  Aggregate Amount Beneficially Owned by Each Reporting Person
                                                                    3,750,000(2)
- --------------------------------------------------------------------------------

(12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares
      (See Instructions)                                                  [ ](2)
- --------------------------------------------------------------------------------

(13)  Percent of Class Represented by Amount in Row (11)                 7.9%(3)
- --------------------------------------------------------------------------------

(14)  Type of Reporting Person (See Instructions)                             OO
- --------------------------------------------------------------------------------

       (1)  Voting and dispositive power is shared among Energy PLC and EnCap
Investments (defined in Item 2.) 

       (2)  Energy PLC disclaims any beneficial ownership of EnCap LP's or EnCap
Investment's (defined in Item 2) shares and only claims beneficial ownership of
the above-mentioned 3,750,000 shares.  Please see Item 5.

       (3)  Based on 47,487,142 shares issued and outstanding as of October 30,
1998 as represented by the Issuer to the reporting persons on October 30, 1998.

                                     Page 2

<PAGE>   3

CUSIP NO. G80000181445
                                   SCHEDULE 13D

(1)   Names of Reporting Persons I.R.S. Identification Nos. of Above Persons

            ENCAP EQUITY 1996 LIMITED PARTNERSHIP
- --------------------------------------------------------------------------------

(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)                         WC (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 EQUITY 1996 LIMITED PARTNERSHIP IS
                                       A LIMITED PARTNERSHIP ORGANIZED UNDER THE
                                       LAWS OF THE STATE OF TEXAS
- --------------------------------------------------------------------------------

                       (7)      Sole Voting Power                              0
      Number of        ---------------------------------------------------------
      Shares Bene-
      ficially         (8)      Shared Voting Power                11,250,000(1)
      Owned by         ---------------------------------------------------------
      Each
      Reporting        (9)      Sole Dispositive Power                         0
      Person With      ---------------------------------------------------------
      
                       (10)     Shared Dispositive Power           11,250,000(1)
- --------------------------------------------------------------------------------

(11)  Aggregate Amount Beneficially Owned by Each Reporting Person
                                                                   11,250,000(2)
- --------------------------------------------------------------------------------

(12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares
      (See Instructions)                                                    O(2)
- --------------------------------------------------------------------------------

(13) Percent of Class Represented by Amount in Row (11)
                                                                        23.7%(3)
- --------------------------------------------------------------------------------

(14)  Type of Reporting Person (See Instructions)                             PN
- --------------------------------------------------------------------------------
        (1)  Voting and dispositive power is shared among EnCap LP and EnCap
Investments (defined in Item 2.)

        (2)  EnCap LP disclaims any beneficial ownership of EnCap Investments'
or Energy PLC's (defined in Item 2) shares and only claims beneficial ownership
of the above-mentioned 11,250,000 shares. Please see Item 5.

        (3)  Based on 47,487,142 shares issued and outstanding as of October 30,
1998 as represented by the Issuer to the reporting persons on October 30, 1998.

                                     Page 3

<PAGE>   4

CUSIP NO. G80000181445             SCHEDULE 13D

(1)   Names of Reporting Persons I.R.S. Identification Nos. of Above Persons

            ENCAP INVESTMENTS 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.C. IS A LIMITED
                                           LIABILITY COMPANY ORGANIZED UNDER THE
                                           LAWS OF THE STATE OF TEXAS
- --------------------------------------------------------------------------------

                       (7)      Sole Voting Power                        545,454
      Number of        ---------------------------------------------------------
      Shares Bene-
      ficially         (8)      Shared Voting Power                15,000,000(1)
      Owned by         ---------------------------------------------------------
      Each
      Reporting        (9)      Sole Dispositive Power                   545,454
      Person With      ---------------------------------------------------------
      
                       (10)     Shared Dispositive Power           15,000,000(1)
- --------------------------------------------------------------------------------

(11)  Aggregate Amount Beneficially Owned by Each Reporting Person 15,545,454(2)
- --------------------------------------------------------------------------------

(12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares
      (See Instructions)                                                    O(2)
- --------------------------------------------------------------------------------

(13)  Percent of Class Represented by Amount in Row (11)                32.7%(3)
- --------------------------------------------------------------------------------

(14)  Type of Reporting Person (See Instructions)                             OO
- --------------------------------------------------------------------------------
         (1)  Voting and dispositive power is shared among Energy PLC and EnCap
Investments, and EnCap LP and EnCap Investments respectively (defined in Item
2.)
         (2)  EnCap Investments disclaims any beneficial ownership of EnCap LP's
or Energy PLC's (defined in Item 2) shares. 

         (3)  Based on 47,487,142 shares issued and outstanding as of October
30, 1998 as represented by the Issuer to the reporting persons on October 30,
1998.

                                     Page 4

<PAGE>   5

ITEM 1.     SECURITY AND ISSUER.

      The class of equity securities to which this statement relates is ordinary
shares, of (pound) 0.01 each (the "Ordinary Shares"), of Alliance Resources PLC,
a public limited company organized under the laws of England and Wales (the
"Issuer"). The address of the principal executive offices of the Issuer is
Kingsbury House, 15-17 King Street, London, England.

ITEM 2.     IDENTITY AND BACKGROUND.

      (a) - (c)

      Energy Capital Investment Company PLC ("Energy PLC"), is a company
organized and existing under the laws of England. Energy PLC's principal
business address and office is located at c/o Aberdeen Asset Management, 1 Bow
Churchyard, Cheapside, London EC4M 9HH, England. The principal business of
Energy PLC is engaging in oil and gas related investments.

      EnCap Equity 1996 Limited Partnership ("EnCap LP"), is a limited
partnership organized and existing under the laws of the State of Texas. EnCap
LP's principal business address and office is located at 1100 Louisiana, Suite
3150, Houston, Texas 77002. The principal business of EnCap LP is making oil and
gas related investments.

      EnCap Investments L.C. ("EnCap Investments"), is a limited liability
company organized under the laws of the State of Texas. EnCap Investments is the
general partner of EnCap LP. EnCap Investments also serves as an investment
advisor to Energy PLC under an Investment Advisory Agreement dated as of
February 4, 1994. EnCap Investments' principal business address and office is
located at 1100 Louisiana, Suite 3150, Houston, Texas 77002. The principal
business of EnCap Investments is to act as a financial consultant, investment
advisor and/or finder for its clients with respect to financial and investment
transactions in the oil and gas industry.

      The name, business address, present principal occupation or employment and
the name, principal business address of any corporation or other organization in
which such employment is conducted, of (i) each of the executive officers and
directors of Energy PLC and (ii) the directors of EnCap Investments (which is
the general partner of EnCap LP), are set forth below:




<TABLE>
<CAPTION>
                                                                                  Name, Principal Business Address of
                                                                                    Organization in which Principal
      Name and                     Capacity in Which          Principal                       Occupation
   Business Address                      Serves              Occupation                      is Conducted
   ----------------                      ------              ----------                      ------------

<S>                                  <C>                     <C>                       <C>
(i)   Energy Capital Investment Company PLC.
      --------------------------------------

Peter C. Tudball C.B.E.                 Director             Non-executive             Energy Capital Investment
Casu Investments Ltd.                Energy Capital           Director of                     Company PLC
London House                           Investment               various                    c/o Aberdeen Asset
53-54 Haymarket                        Company PLC             companies                   Management, 1 Bow
London SW1Y 4RP                                                                          Churchyard, Cheapside,
                                                                                        London EC4M 9HH, England
</TABLE>

                                     Page 5

<PAGE>   6

<TABLE>
<CAPTION>
                                                                                  Name, Principal Business Address of
                                                                                    Organization in which Principal
      Name and                     Capacity in Which          Principal                       Occupation
   Business Address                      Serves              Occupation                      is Conducted
   ----------------                      ------              ----------                      ------------

<S>                                  <C>                  <C>                           <C>
Leo G. Deschuyteneer                   Director of             Executive                       Sofina SA
38 Rue de Naples                     Energy Capital       Director of Sofina                38 Rue de Naples
B-1050                                 Investment                 SA                             B-1050
Brussels, Belgium                      Company PLC                                              Brussels

Eugene Fiedorek                        Director of             Managing                  EnCap Investments L.C.
3811 Turtle Creek Blvd.              Energy Capital            Director                 3811 Turtle Creek Blvd.,
Suite 1080                             Investment                EnCap                         Suite 1080
Dallas, TX 75219                       Company PLC         Investments L.C.               Dallas, Texas 75219

Alan B. Henderson                      Director of            Chairman of                 Ranger Oil (UK) Ltd.
Ranger House                         Energy Capital         Ranger Oil (UK)                   Ranger House
Walnut Tree Close                      Investment                Ltd.                      Walnut Tree Close
Guildford, Surrey                      Company PLC                                         Guildford, Surrey
GU1 4HS                                                                                         GU1 4HS

James F. Ladner                        Director of             Executive                  RP & C International
Gartenstrasse 10                     Energy Capital        Director of RP &                 Gartenstrasse 10
CH-8002                                Investment           C International                     CH-8002
Zurich, Switzerland                    Company PLC                                        Zurich, Switzerland

Gary R. Petersen                        Director               Managing                  EnCap Investments L.C.
1100 Louisiana                       Energy Capital            Director                      1100 Louisiana
Suite 3150                             Investment                EnCap                         Suite 3150
Houston, TX 77002                      Company PLC         Investments L.C.               Houston, Texas 77002

William W. Vanderfelt                   Director           Managing Partner                  Petercam S.A.
19 Place Sainte-Gudule               Energy Capital        of Petercam S.A.              19 Place Sainte-Gudule
B-1000                                 Investment                                                B-1000
Brussels, Belguim                      Company PLC                                         Brussels, Belguim

(ii) EnCap Investments L.C.

Gary R. Petersen                        Managing               See above                       See above
1100 Louisiana                          Director
Suite 3150                                EnCap
Houston, TX 77002                      Investments
                                          L.C.

D. Martin Phillips                      Managing               Managing                  EnCap Investments L.C.
1100 Louisiana                          Director               Director                1100 Louisiana, Suite 3150
Suite 3150                                EnCap                  EnCap                     Houston, TX 77002
Houston, TX 77002                      Investments         Investments L.C.
                                          L.C.
</TABLE>

                                     Page 6

<PAGE>   7

<TABLE>
<CAPTION>
                                                                                  Name, Principal Business Address of
                                                                                    Organization in which Principal
      Name and                     Capacity in Which          Principal                       Occupation
   Business Address                      Serves              Occupation                      is Conducted
   ----------------                      ------              ----------                      ------------

<S>                                  <C>                  <C>                           <C>
Robert L. Zorich                        Managing               Managing                  EnCap Investments L.C.
1100 Louisiana                          Director               Director                1100 Louisiana, Suite 3150
Suite 3150                                EnCap                  EnCap                     Houston, TX 77002
Houston, TX 77002                      Investments         Investments L.C.
                                          L.C.

Eugene C. Fiedorek                      Managing               See above                       See above
3811 Turtle Creek Blvd.                 Director
Suite 1080                                EnCap
Dallas, TX 75219                       Investments
                                          L.C.

David B. Miller                         Managing               Managing                  EnCap Investments L.C.
3811 Turtle Creek Blvd.                 Director               Director                 3811 Turtle Creek Blvd.,
Suite 1080                                EnCap                  EnCap                         Suite 1080
Dallas, TX 75219                       Investments         Investments L.C.               Dallas, Texas 75219
                                          L.C.
</TABLE>

      (d)  None of Energy PLC, EnCap LP, EnCap Investments or any of the
individuals identified in this Item 2 has, during the last five years, been
convicted in a criminal proceeding (excluding traffic violations or similar
misdemeanors).

      (e)  None of Energy PLC, EnCap LP, EnCap Investments or any of the
individuals identified in this Item 2 has, during the last five years, been a
party to a civil proceeding of a judicial or administrative body of competent
jurisdiction and a result of such proceeding was or is subject to a judgment,
decree or final order enjoining future violations of, or prohibiting or
mandating activities subject to, federal or state securities laws or finding any
violation with respect to such laws.

      (f)  Each of the individuals identified in this Item 2 is a citizen of the
United States of America, with the exception of (i) Peter C. Tudball, C.B.E.,
Sir Peter G. Cazalet, Alan B. Henderson, and William W. Vanderfelt who are all
citizens of the United Kingdom, (ii) Energy PLC which was formed under the laws
of the United Kingdom, (iii) Leo G. Deschuyteneer who is a citizen of Belguim,
and (iv) James F. Ladner who is a citizen of Switzerland.

                                     Page 7

<PAGE>   8

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

      The source of funds used by Energy PLC to purchase 3,750,000 Ordinary
Shares of the Issuer is the working capital of Energy PLC. No part of the
purchase price will be represented by funds or other consideration borrowed or
otherwise obtained for the purpose of acquiring, holding trading or voting the
securities.

      The source of funds used by EnCap LP to purchase 11,250,000 Ordinary
Shares of the Issuer is the working capital of EnCap LP. No part of the purchase
price will be represented by funds or other consideration borrowed or otherwise
obtained for the purpose of acquiring, holding trading or voting the securities.

      The 545,454 Ordinary Shares of the Issuer acquired by EnCap Investments
(the "EnCap Investments Shares") were paid by the Issuer to EnCap Investments as
a placement fee in conjunction with a purchase agreement, dated as of October
30, 1998, between the Issuer and EnCap LP and Energy PLC (the "Purchase
Agreement"). No part of the purchase price will be represented by funds or other
consideration borrowed or otherwise obtained for the purpose of acquiring,
holding trading or voting the securities.

      Energy PLC, EnCap LP and EnCap Investments obtained beneficial ownership
of the Ordinary Shares pursuant to the Purchase Agreement. Pursuant to the
Purchase Agreement, EnCap LP acquired $7,312,500 principal amount of the
Issuer's 10% Subordinated Notes (the "Notes") and 11,250,000 Ordinary Shares for
a purchase price of $7,500,000 and (ii) Energy PLC acquired $2,437,500 principal
amount of the Notes and 3,725,000 Ordinary Shares for a purchase price of
$2,500,000. Pursuant to the Purchase Agreement, the aggregate purchase price was
allocated $250,000 to the Ordinary Shares and $9,750,000 to the Notes. Pursuant
to the Purchase Agreement, the Issuer paid EnCap Investments a placement fee of
545,454 Ordinary Shares.

ITEM 4.     PURPOSE OF TRANSACTION.

      Energy PLC, EnCap LP and EnCap Investments acquired the securities herein
reported for investment purposes. Depending on market conditions, general
economic conditions and other factors that each may deem significant to
investment decisions, Energy PLC and EnCap LP may directly and EnCap Investments
may directly or indirectly purchase additional Ordinary Shares in the open
market or in private transactions or may dispose of all or a portion of the
Ordinary Shares that either of them may hereafter acquire.

      Pursuant to the Purchase Agreement, Energy PLC and EnCap LP together have
the right to designate one member of the board of directors of the Issuer.

      Except as otherwise 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.

ITEM 5.     INTEREST IN SECURITIES OF THE ISSUER.

      (a)  Energy PLC. Energy PLC is the beneficial owner of 3,750,000 Ordinary
Shares. Based on the 47,487,142 Ordinary Shares outstanding, as represented by
the Issuer to the reporting persons on October 30, 1998, Energy PLC is the
beneficial owner of approximately 7.9% of the outstanding Ordinary Shares.

                                     Page 8

<PAGE>   9

           EnCap LP. EnCap LP is the beneficial owner of 11,250,000 Ordinary
Shares. Based on the 47,487,142 Ordinary Shares outstanding, represented by the
Issuer to the reporting persons on October 30, 1998, EnCap LP is the beneficial
owner of approximately 23.7% of the outstanding Ordinary Shares.

           EnCap Investments. EnCap Investments, as the sole general partner of
EnCap LP and as an investment advisor of Energy PLC, is the beneficial owner of
15,000,000 Ordinary Shares. EnCap Investments also owns 545,454 Ordinary Shares
directly, giving EnCap Investments a combined beneficial ownership of 15,545,454
Ordinary Shares. Based on the 47,487,142 Ordinary Shares outstanding,
represented by the Issuer to the reporting persons on October 30, 1998, EnCap
Investments is the beneficial owner of approximately 32.7% of the outstanding
Ordinary Shares.

           Executive Officers and Directors. Except as otherwise described
herein, to the knowledge of each of the filing persons, none of the executive
officers and directors of Energy PLC or the managing directors of EnCap
Investments named in Item 2 is the beneficial owner of any Ordinary Shares.

      (b)  Energy PLC. Pursuant to the Investment Agreement (as defined in Item
6), Energy PLC shares the power to vote or direct the vote and to dispose or
direct the disposition of 3,750,000 Ordinary Shares with EnCap Investments.

           EnCap LP. Through its general partner, EnCap LP shares the power to
vote or direct the vote and to dispose or direct the disposition of 11,250,000
Ordinary Shares with EnCap Investments, its general partner.

           EnCap Investments. EnCap Investments shares the power to vote and
direct the vote or to dispose or direct the disposition of 15,000,000 Ordinary
Shares with each of Energy PLC by virtue of the Investment Agreement (as defined
in Item 6) and EnCap LP as its general partner. EnCap Investments disclaims
beneficial ownership of any Ordinary Shares owned by either EnCap LP or Energy
PLC.

           Executive Officers and Directors. No executive officer or director
of Energy PLC or managing director of EnCap Investments has the power to vote or
direct the vote or dispose or direct the disposition of any Ordinary Shares.

      (c)  Except as otherwise described herein or in any Exhibit filed herewith
and to the knowledge of each of the filing persons, none of the persons named in
response to paragraph (a) above has effected any transaction in the Ordinary
Shares during the past 60 days.

      (d)  No person other than Energy PLC, EnCap LP and EnCap Investments has
the right to receive or the power to direct the receipt of dividends from, or
the proceeds from the sale of, the Ordinary Shares 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 Ordinary
Shares.

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

      Except as set forth in Items 5 and 6 or in the Exhibits filed herewith,
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 Ordinary Shares
deemed to be beneficially owned by Energy PLC, EnCap LP and EnCap Investments.

                                     Page 9

<PAGE>   10

      Energy PLC, EnCap LP, EnCap Investments and the Issuer entered into a
Registration Rights Agreement dated October 30, 1998 (the "Registration Rights
Agreement"), pursuant to which the Issuer agreed to use its best efforts to
effect a registration statement with the Securities and Exchange Commission
covering the Registrable Securities, as defined by the Registration Rights
Agreement, upon request of Energy PLC, EnCap LP or EnCap Investments (a "Demand
Request"), up to a maximum of two such Demand Requests. The Issuer also agreed
to register any Registrable Securities in conjunction with any registration of
its securities, subject to certain restrictions, upon request (a "Piggyback
Registration").

      EnCap Investments, as the general partner of EnCap LP, is a party to the
Agreement of Limited Partnership of EnCap LP, and is a party to that certain
Investment Advisory Agreement dated February 4, 1994, between EnCap Investments
and Energy PLC (the "Investment Agreement") whereby EnCap Investments acts as an
investment advisor to Energy PLC.

ITEM 7.    MATERIAL TO BE FILED AS EXHIBITS.

Exhibit 1     -  Joint Filing Agreement dated November 9, 1998, between Energy
                 PLC, EnCap LP and EnCap Investments.

Exhibit 4.1   -  Purchase Agreement dated October 30, 1998, between Alliance
                 Resources PLC, EnCap Equity 1996 Limited Partnership and Energy
                 Capital Investment Company PLC.

Exhibit 4.2   -  Registration Rights Agreement dated October 30, 1998, between
                 Alliance Resources PLC, EnCap Equity 19967 Limited Partnership,
                 Energy Capital Investment Company PLC and EnCap Investments
                 L.C.

Exhibit 4.3   -  Investment Advisory Agreement dated February 4, 1994.

                                     Page 10

<PAGE>   11

                                   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: November 9, 1998               ENERGY CAPITAL INVESTMENT COMPANY PLC



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



Date: November 9, 1998               ENCAP EQUITY 1996 LIMITED PARTNERSHIP

                                     By: EnCap Investments L.C., General Partner



                                     /s/ Robert L. Zorich
                                     ------------------------------------------
                                        Robert L. Zorich
                                        Managing Director



Date: November 9, 1998               ENCAP INVESTMENTS L.C.



                                     /s/ Robert L. Zorich
                                     ------------------------------------------
                                        Robert L. Zorich
                                        Managing Director

                                     Page 11

<PAGE>   12

                                 EXHIBIT INDEX



<TABLE>
<CAPTION>
Exhibit
Number                                                           Description
- -------                                                          -----------
<S>              <C>
Exhibit 1     -  Joint Filing Agreement dated November 9, 1998, between Energy PLC, EnCap LP and EnCap Investments.

Exhibit 4.1   -  Purchase Agreement dated October 30, 1998, between Alliance Resources PLC, EnCap Equity 1996 Limited Partnership
                 and Energy Capital Investment Company PLC.

Exhibit 4.2   -  Registration Rights Agreement dated October 30, 1998, between Alliance Resources PLC, EnCap Equity 19967 Limited
                 Partnership, Energy Capital Investment Company PLC and EnCap Investments L.C.

Exhibit 4.3   -  Investment Advisory Agreement dated February 4, 1994.
</TABLE>




<PAGE>   1


                                    EXHIBIT 1

                                    AGREEMENT

         The undersigned reporting persons hereby agree that the statements
filed pursuant to this Schedule 13D dated November 9, 1998, to which this
Agreement is filed as an exhibit, are filed on behalf of each of them.

Date: November 9, 1998                 ENERGY CAPITAL INVESTMENT COMPANY PLC



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



Date: November 9, 1998                 ENCAP EQUITY 1996 LIMITED PARTNERSHIP



                                       By:  /s/ Robert L. Zorich
                                            -----------------------------------
                                            Robert L. Zorich
                                            Managing Director



Date: November 9, 1998                 ENCAP INVESTMENTS L.C.



                                       By:  /s/ Robert L. Zorich
                                            -----------------------------------
                                            Robert L. Zorich
                                            Managing Director

<PAGE>   1
                                                                    EXHIBIT 4.1

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








                               PURCHASE AGREEMENT



                                 by and between



                             ALLIANCE RESOURCES PLC



                                       and



                      ENCAP EQUITY 1996 LIMITED PARTNERSHIP

                                       AND

                      ENERGY CAPITAL INVESTMENT COMPANY PLC





                                October 27, 1998






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




<PAGE>   2



                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                               Page

<S>                                                                                                              <C>
PURCHASE AGREEMENT................................................................................................1

ARTICLE I - DEFINITIONS...........................................................................................1
         1.1           Certain Defined Terms......................................................................1
         1.2           Certain Additional Defined Terms...........................................................8
         1.3           References and Construction................................................................8

ARTICLE II - TERMS OF THE TRANSACTION.............................................................................9
         2.1           Agreement to Sell and to Purchase the Securities...........................................9
         2.2           Purchase Price and Payment................................................................10
         2.3           Placement Fee.............................................................................10

ARTICLE III - CLOSING............................................................................................10
         3.1           Closing...................................................................................10
         3.2           Deliveries by the Company.................................................................10
         3.3           Deliveries by Buyer.......................................................................11

ARTICLE IV - REPRESENTATIONS AND WARRANTIES OF SELLER............................................................12
         4.1           Corporate Organization....................................................................12
         4.2           Qualification.............................................................................12
         4.3           Charter and Bylaws........................................................................12
         4.4           Capitalization of the Company.............................................................12
         4.5           Authority Relative to This Agreement......................................................13
         4.6           No Conflict...............................................................................13
         4.7           Consents and Approvals, Licenses, Etc.....................................................13
         4.8           Subsidiaries..............................................................................13
         4.9           Shares....................................................................................14
         4.10          Financial Statements......................................................................15
         4.11          SEC Filings...............................................................................15
         4.12          Absence of Undisclosed Liabilities........................................................16
         4.13          Absence of Certain Changes................................................................16
         4.14          Tax Matters...............................................................................16
         4.15          Environmental and Other Laws..............................................................17
         4.16          Legal Proceedings.........................................................................18
         4.17          Title to Properties; Permits; Licenses; Condition of Assets...............................18
         4.18          ERISA.....................................................................................19
         4.19          Agreements................................................................................21
         4.20          Labor Disputes and Acts of God............................................................22
         4.21          Registration Rights.......................................................................22
         4.22          Offering of Securities....................................................................23
         4.23          Government Regulation.....................................................................23
</TABLE>


                                       -i-

<PAGE>   3



<TABLE>
<S>                                                                                                             <C>
         4.24          Brokerage Fees............................................................................23
         4.25           Solvency.................................................................................23
         4.26           Full Disclosure..........................................................................23

ARTICLE V - REPRESENTATIONS AND WARRANTIES OF BUYER..............................................................24
         5.1           Corporate Organization....................................................................24
         5.2           Authority Relative to This Agreement......................................................24
         5.3           Investment Intent; Investment Experience; Restricted Securities...........................24
         5.4           Brokerage Fees............................................................................25

ARTICLE VI - CONDUCT OF COMPANY PENDING CLOSING..................................................................25
         6.1           Conduct and Preservation of Business......................................................25
         6.2           Restrictions on Certain Actions...........................................................25
         6.3           Certain Action............................................................................27

ARTICLE VII - CONDITIONS TO OBLIGATIONS OF THE COMPANY...........................................................27
         7.1           Representations and Warranties True.......................................................28
         7.2           Covenants and Agreements Performed........................................................28
         7.3           HSR Act...................................................................................28
         7.4           Legal Proceedings.........................................................................28

ARTICLE VIII - CONDITIONS TO OBLIGATIONS OF BUYER................................................................28
         8.1           Representations and Warranties True.......................................................28
         8.2           Covenants and Agreements Performed........................................................29
         8.3           HSR Act...................................................................................29
         8.4           Legal Proceedings.........................................................................29
         8.5           Consents..................................................................................29
         8.6           No Material Adverse Change................................................................29
         8.7           Senior Credit Facility....................................................................29
         8.8           Subordination Agreement...................................................................29
         8.9           U.K. Opinion..............................................................................29
         8.10          Closing of the Acquisitions and the Senior Credit Facility................................30

ARTICLE IX - PRE-CLOSING TERMINATION.............................................................................30
         9.1           Termination...............................................................................30
         9.2           Effect of Termination.....................................................................30

ARTICLE X - AFFIRMATIVE COVENANTS OF THE COMPANY.................................................................30
         10.1          Payment and Performance...................................................................30
         10.2          Books, Financial Statements and Reports...................................................31
         10.3          Notice of Material Events and Change of Address...........................................32
         10.4          Maintenance of Properties.................................................................33
         10.5          Maintenance of Existence and Qualifications...............................................33
         10.6          Payment of Trade Liabilities, Taxes, etc..................................................33
         10.7          Insurance.................................................................................33
</TABLE>



                                      -ii-

<PAGE>   4



<TABLE>
<S>                                                                                                             <C>
         10.8          Compliance with Agreements and Law........................................................33
         10.9          Guaranties of Company's Subsidiaries......................................................33

ARTICLE XI - NEGATIVE COVENANTS OF THE COMPANY...................................................................34
         11.1          Indebtedness..............................................................................34
         11.2          Limitation on Liens.......................................................................34
         11.3          Limitation on Mergers.....................................................................34
         11.4          Limitation on Sales of Property...........................................................35
         11.5          Limitation on Investments and New Businesses..............................................35
         11.6          Transactions with Affiliates..............................................................35
         11.7          Restricted Payments.......................................................................35
         11.8          Material Amendments.......................................................................35

ARTICLE XII - PREPAYMENT OF THE NOTE.............................................................................36
         12.1          Optional Prepayment.......................................................................36

ARTICLE XIII - EVENTS OF DEFAULT AND REMEDIES....................................................................36
         13.1          Events of Default.........................................................................36
         13.2          Remedies..................................................................................38

ARTICLE XIV - ADDITIONAL AGREEMENTS..............................................................................38
         14.1          Third Party Consents......................................................................38
         14.2          Access to Information.....................................................................39
         14.3          Listing of Shares.........................................................................39
         14.4          Use of Proceeds...........................................................................39
         14.5          Board Representation......................................................................39
         14.6          Public Announcements......................................................................39
         14.7          Fees and Expenses.........................................................................40
         14.8          Costs of Enforcement......................................................................40
         14.9          Transfer Taxes............................................................................40
         14.10         Indemnification...........................................................................40

ARTICLE XV - MISCELLANEOUS.......................................................................................40
         15.1          Notices...................................................................................40
         15.2          Waiver and Amendment......................................................................42
         15.3          Survival..................................................................................42
         15.4          Entire Agreement..........................................................................42
         15.5          Binding Effect; Assignment; No Third Party Benefit........................................42
         15.6          Severability..............................................................................42
         15.7          GOVERNING LAW.............................................................................43
         15.8          Remedies Not Exclusive....................................................................43
         15.9          Further Assurances........................................................................43
         15.10         Counterparts..............................................................................43
         15.11         Injunctive Relief.........................................................................43
         15.12         Consent to Jurisdiction...................................................................43
         15.13         Payments..................................................................................44

</TABLE>



                                      -iii-


<PAGE>   5



                               PURCHASE AGREEMENT


         PURCHASE AGREEMENT (this "Agreement"), dated as of October 27, 1998,
between Alliance Resources PLC, a public limited company organized under the
laws of England and Wales (the "Company"), and EnCap Equity 1996 Limited
Partnership, a Texas limited partnership ("EnCap LP"), and Energy Capital
Investment Company PLC, an English investment company ("ECIC") (with EnCap LP
and ECIC sometimes being herein collectively called "Buyer").

         WHEREAS, the Company desires to issue and sell to Buyer, and Buyer
desires to purchase from the Company, (i) $9,750,000 aggregate principal amount
of its 10% Subordinated Notes due 2005 (the "Notes") and (ii) 15,000,000
ordinary shares of 1p each of the Company (the "Shares") (the Notes and the
Shares are referred to herein collectively as the "Securities");

         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 Buyer hereby agree as follows:


                                    ARTICLE I

                                   DEFINITIONS

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

                  "Acquisitions" means the acquisition by the Company of all of
         the issued and outstanding shares of the capital stock of Difco Limited
         and the acquisition by Difco Limited of certain oil and gas interests
         in the East Irish Sea from Burlington Resources Limited (Irish Sea),
         each as described in the Listing Particulars.

                  "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.

                  "Alliance Group" means Alliance Resources Group, Inc., a
         Delaware corporation.

                  "Alliance USA" means Alliance Resources (USA), Inc., a
         Delaware corporation.

                  "Ancillary Documents" means each agreement, certificate,
         document, commitment and writing (other than this Agreement) executed
         or to be executed by the Company or Buyer



                                                     

<PAGE>   6



         in connection with the transactions contemplated herein or therein,
         including without limitation the Notes, the Subsidiary Guarantees and
         the Registration Rights 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.

                  "ARCOL" means ARCOL Inc., a Delaware corporation.

                  "ARNO" means ARNO Inc., a Delaware corporation.

                  "Burlington Agreement" means that certain Sale and Purchase
         Agreement East Irish Sea dated June 29, 1998 by and between Difco
         Limited and Burlington Resources (Irish Sea) Limited, as amended by
         letter agreement dated October 5, 1998.

                  "Change of Control" means the occurrence of any of the
         following events: (a) any Person or two or more Persons, other than
         Buyer or any affiliate of Buyer, acting as a group shall acquire
         beneficial ownership (within the meaning of Rule 13d-3 of the
         Securities and Exchange Commission under the Exchange Act, and
         including holding proxies to vote for the election of directors other
         than proxies held by the Company's management or their designees to be
         voted in favor of persons nominated by the Company's Board of
         Directors) of 33% or more of the outstanding voting securities of the
         Company, measured by voting power (including both ordinary shares and
         any preferred stock or other equity securities entitling the holders
         thereof to vote with the holders of common stock in elections for
         directors of the Company), exclusive of the issuance of ordinary shares
         contemplated under this Agreement, (b) the Company shall fail
         beneficially to own 100% of the outstanding shares of voting capital
         stock of Alliance Group, Manx, LRI or Difco on a fully-diluted basis,
         (c) LRI shall fail beneficially to own 100% of the outstanding shares
         of the voting capital stock of LPC, GOCA, New GOC or Enpro, on a
         fully-diluted basis, (d) Alliance Group shall fail beneficially to own
         100% of the outstanding shares of the voting capital stock of Source,
         ARNO, ARCOL or Alliance USA, (e) one-third or more of the directors of
         the Company shall consist of persons not nominated by the Company's
         Board of Directors (not including as Board nominees any directors which
         the Board is obligated to nominate pursuant to shareholders agreements,
         voting trust arrangements or similar arrangements) or (f) within three
         years of the Closing Date, the employment by the Company of John Keenan
         or Paul Fenemore terminates for any reason.

                  "Companies Act" means the Companies Act 1985 as amended.

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

                  "Default" shall mean an Event of Default and any default,
         event or condition which would, with the giving of any requisite
         notices and the passage of any requisite periods of time, constitute an
         Event of Default.




                                       -2-

<PAGE>   7



                  "Difco" means Difco Limited, a private limited company
         incorporated under the laws of England and Wales

                  "Difco Agreement" means that certain Amended and Restated Sale
         and Purchase Agreement dated September 23, 1998, by and between the
         Company and the shareholders of Difco Limited.

                  "Enpro" means ENPRO, INC., a Texas corporation.

                  "Environmental Laws" means any and all laws relating to the
         environment or to emissions, discharges, releases or threatened
         releases of pollutants, contaminants, chemicals, or industrial, toxic
         or hazardous substances or wastes into the environment including
         ambient air, surface water, ground water, or land, or otherwise
         relating to the manufacture, processing, distribution, use, treatment,
         storage, disposal, transport, or handling of pollutants, contaminants,
         chemicals, or industrial, toxic or hazardous substances or wastes.

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

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

                  "Fiscal Quarter" shall mean a three-month period ending on
         July 31, October 31, January 31 or April 30 of any year.

                  "Fiscal Year" shall mean the twelve-month period ending on
         April 30 of any year.

                  "GOCA" means LaTex/GOC Acquisition, Inc., a Delaware
         corporation.

                  "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).

                  "Hazardous Materials" means any substance regulated under
         Environmental Law, whether as pollutants, contaminants, or chemicals,
         or as industrial, toxic or hazardous substances or wastes, or
         otherwise.

                  "HSR Act" means the Hart-Scott-Rodino Antitrust Improvements
         Act of 1976, as amended.

                  "Indebtedness" of any Person means Liabilities in any of the
         following categories: (a) Liabilities for borrowed money; (b)
         Liabilities constituting an obligation to pay the deferred purchase
         price of property or services; (c) Liabilities evidenced by a bond,
         debenture, note or similar instrument; (d) Liabilities which would
         under U.S. GAAP be shown on such Person's balance sheet as a liability,
         and is payable more than one year from the date of creation thereof
         (other than reserves for taxes and reserves for contingent
         obligations); (e) Liabilities arising under futures contracts, forward
         contracts, swap, cap or



                                       -3-

<PAGE>   8



         collar contracts, option contracts, hedging contracts, other derivative
         contracts, or similar agreements; (f) Liabilities constituting
         principal under leases capitalized in accordance with U.S. GAAP; (g)
         Liabilities arising under conditional sales or other title retention
         agreements; (h) Liabilities owing under direct or indirect guaranties
         of Liabilities of any other Person or constituting obligations to
         purchase or acquire or to otherwise protect or insure a creditor
         against loss in respect of Liabilities of any other Person (such as
         obligations under working capital maintenance agreements, agreements to
         keep-well, or agreements to purchase Liabilities, assets, goods,
         securities or services), but excluding endorsements in the ordinary
         course of business of negotiable instruments in the course of
         collection; (i) Liabilities (for example, repurchase agreements)
         consisting of an obligation to purchase securities or other property,
         if such Liabilities arises out of or in connection with the sale of the
         same or similar securities or property; (j) Liabilities with respect to
         letters of credit or applications or reimbursement agreements therefor;
         (k) Liabilities with respect to payments received in consideration of
         oil, gas, or other minerals yet to be acquired or produced at the time
         of payment (including obligations under "take-or-pay" contracts to
         deliver gas in return for payments already received and the
         undischarged balance of any production payment created by such Person
         or for the creation of which such Person directly or indirectly
         received payment); or (l) Liabilities with respect to other obligations
         to deliver goods or services in consideration of advance payments
         therefor; provided, however, that the "Indebtedness" of any Person
         shall not include Liabilities that were incurred by such Person on
         ordinary trade terms to vendors, suppliers, or other Persons providing
         goods and services for use by such Person in the ordinary course of its
         business, unless and until such Liabilities are outstanding more than
         90 days past the original invoice or billing date therefor.

                  "IRS" means the Internal Revenue Service.

                  "Key Employment Agreements" means (i) that certain Executive
         Service Agreement dated October 5, 1996 between the Company and John A.
         Keenan, as amended by Supplemental Agreement dated October 15, 1996,
         (ii) that certain Service Agreement dated September 20, 1996 between
         the Company and Paul Raymond Fenemore, as amended by Supplemental
         Agreement dated September 20, 1996 and (iii) that certain Executive
         Service Agreement dated December 16, 1996 between the Company and Harry
         Brian Kerr Williams.

                  "Liabilities" shall mean, as to any Person, all indebtedness,
         liabilities and obligations of such Person, whether matured or
         unmatured, liquidated or unliquidated, primary or secondary, direct or
         absolute, fixed or contingent, and whether or not required to be
         considered pursuant to U.S. GAAP.

                  "Lien" shall mean, with respect to any property or assets, any
         right or interest therein of a creditor to secure Liabilities owed to
         such creditor or any other arrangement with such creditor which
         provides for the payment of such Liabilities out of such property or
         assets or which allows him to have such Liabilities satisfied out of
         such property or assets prior to the general creditors of any owner
         thereof, including any lien, mortgage, security interest, pledge,
         deposit, production payment, rights of a vendor under any title
         retention or conditional sale agreement or lease substantially
         equivalent thereto, tax lien, mechanic's or



                                       -4-

<PAGE>   9



         materialman's lien, or any other charge or encumbrance for security
         purposes, whether arising by law or agreement or otherwise, but
         excluding any right of offset which arises without agreement in the
         ordinary course of business. "Lien" shall also mean any filed financing
         statement, any registration of a pledge (such as with an issuer of
         uncertificated securities), or any other arrangement or action which
         would serve to perfect a Lien described in the preceding sentence,
         regardless of whether such financing statement is filed, such
         registration is made, or such arrangement or action is undertaken
         before or after such Lien exists.

                  "Listing Particulars" means the Company's circular to
         shareholders dated June 30, 1998, as supplemented by the Company's
         supplementary listing particulars dated October 7, 1998.

                  "Listing Rules" means the listing rules of the London Stock
         Exchange.

                  "London Stock Exchange" means the London Stock Exchange
         Limited.

                  "LPC" means LaTex Petroleum Corporation, an Oklahoma
         corporation.

                  "LRI" means LaTex Resources, Inc., a Delaware corporation.

                  "LRI Merger" means the merger of Alliance Resources (Delaware)
         Inc. with and into LRI whereby the Company became the sole shareholder
         of LRI.

                  "Majority of the Noteholders" means those holder(s) of Notes
         who hold a majority in aggregate principal amount of the Notes at the
         time outstanding, exclusive of any Notes held by the Company or any
         Subsidiary.

                  "Manx" means Manx Petroleum Plc, a company incorporated under
         the laws of England and Wales.

                  "Material Adverse Effect" means a material adverse change in,
         or a material adverse effect upon (i) the business, assets, results of
         operations, condition (financial or otherwise) or prospects of the
         Company and its Subsidiaries on a consolidated basis, (ii) the
         Company's or any Subsidiary Guarantor's ability to timely pay the
         Obligations or to perform on a timely basis any material obligation of
         the Company under this Agreement or any agreement, instrument, or
         document entered into or delivered in connection herewith or (iii) the
         enforceability of the material terms of this Agreement or any Ancillary
         Document.

                  "New GOC" means Germany Oil Company, a Delaware corporation
         formerly know as LRI Acquisition, Inc.

                  "Obligations" means all Liabilities owing Buyer or, if
         different, the holder of the Notes, pursuant to the this Agreement, the
         Notes or any of the other Ancillary Documents.




                                       -5-

<PAGE>   10



                  "Old LaTex Payables" means those current accounts payable of
         the Company or its consolidated Subsidiaries that meet one or more of
         the following tests and have been certified to Buyer by the Company and
         applicable Subsidiary as being an Old LaTex Payable:

                           (a)      accounts payable the collection of which is 
                  barred by the applicable statute of limitations;

                           (b) accounts payable the collection of which has been
                  compromised or forgiven in part, in either case to the extent
                  of the amount that has been compromised or forgiven; or

                           (c) accounts payable in respect of which the
                  indebtedness was incurred prior to the LRI Merger and where
                  each of the following is true: (i) no payment has been made on
                  an individual amount of indebtedness payable since the LRI
                  Merger, (ii) no contact has been received by the Company or
                  applicable Subsidiary from the applicable creditor since the
                  LRI Merger pertaining to such account or if contact has been
                  received, such account is being diligently contested in good
                  faith, (iii) no promise to pay such account has been made by
                  the Company or applicable Subsidiary since the LRI Merger and
                  (iv) no judgment has been obtained by, or settlement agreement
                  entered into with, such creditor with respect to such
                  indebtedness.

                  "Ordinary Shares" means ordinary shares of 1p each of the
         Company and any securities issued or issuable with respect to such
         shares by way of a stock dividend or stock split or in connection with
         a combination of shares, recapitalization, merger, consolidation or
         other reorganization.

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

                  "Permitted Investment" means any investment, loan, advance,
         guaranty or capital contribution by the Company or any Subsidiary in
         any of the following: (a) properties or assets to be used in the
         ordinary course of business of the Company and its Subsidiaries; (b)
         current assets arising from the sale of goods and services in the
         ordinary course of business of the Company and its Subsidiaries; (c)
         investments in one or more of the Company's Subsidiaries or in any
         Person that concurrently with such investment becomes a Subsidiary; (d)
         any marketable obligation maturing not later than one year after the
         date of acquisition therefor, issued or guaranteed by the United States
         of America or by any agency of the United States of America which has
         the full faith and credit of the United States of America; (e)
         commercial paper which is given the highest rating by a credit rating
         agency of recognized national standing and maturing not more than 270
         days from the date of creation thereof; and (f) any demand deposit or
         time deposit (including certificates of deposit and money market or
         sweep accounts) with a commercial bank or trust company organized and
         doing business under the laws of the United States of America or any
         state thereof which has



                                       -6-

<PAGE>   11



         capital, surplus and undivided profits of at least $250,000,000,
         provided that such deposit must be either payable on demand or mature
         not more than twelve months from the date of investment therein.

                  "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.

                  "Restricted Payment" shall mean any Distribution (as defined
         below) in respect of the Company or any Subsidiary thereof (other than
         on account of capital stock or other equity interests of a Subsidiary
         owned legally or beneficially by the Company or another Subsidiary),
         including any Distribution resulting in the acquisition by the Company
         of securities that would constitute treasury stock. As used in this
         definition, "Distribution" shall mean, in respect of any corporation,
         partnership or other business entity (a) dividends or other
         distributions or payments on capital stock or other equity interest of
         such corporation, partnership or other business entity (except
         distributions in such stock or other equity interest) and (b) the
         redemption or acquisition of such stock or other equity interests or of
         warrants, rights or other options to purchase such stock or other
         equity interests (except when solely in exchange for such stock or
         other equity interests).

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

                  "Securities and Exchange Commission" means the U.S. Securities
         and Exchange Commission.

                  "Senior Credit Facility" means that certain Third Amended and
         Restated Credit Agreement dated even date herewith by and among the
         Company, Alliance USA, GOCA, LPC, New GOC and Source and Bank of
         America National Trust and Savings Association.

                  "Shareholder Approval" means the receipt of the requisite
         number of votes of the shareholders of the Company at a duly convened
         extraordinary general meeting of the Company to approve each of the
         five resolutions proposed in the Notice of Extraordinary General
         Meeting dated October 7, 1998 and contained in the Listing Particulars.

                  "Source" means Source Petroleum, Inc., a Louisiana
         corporation.

                  "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.



                                       -7-

<PAGE>   12



                  "Subsidiary Guarantors" means Difco, Alliance Group, Alliance
         USA, Source, LRI, LPC, GOCA, New GOC and Enpro.

                  "Taxes" means any income taxes or similar assessments or any
         sales, excise, occupation, use, ad valorem, property, production,
         severance, transportation, employment, payroll, franchise, transfer,
         stamp, withholding 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 but not
         limited to any related or supporting information, any amended return or
         report or any information return or report) with respect to Taxes.

                  "Treasury Regulations" means one or more treasury regulations
         promulgated under the Code by the Treasury Department of the United
         States.

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

         1.2 Certain Additional Defined Terms. In addition to such terms as are
defined in the opening paragraph of and the recitals to this Agreement and in
Section 1.1, the following terms are used in this Agreement as defined in the
Sections set forth opposite such terms:

<TABLE>
<CAPTION>
         Defined Term                                   Section Reference
         ------------                                   -----------------

<S>                                                              <C> 
agreements..................................................        4.19
Audited Financial Statements................................        4.10
Closing.....................................................        3.1
Closing Date................................................        3.1
Event of Default............................................       13.1
Latest Balance Sheet........................................        4.10
Notes    ...................................................      preamble
Organic Documents...........................................        4.3
Permitted Liens.............................................       11.2
Placement Fee Shares........................................        2.3
Purchase Price..............................................        2.2
Registration Rights Agreement...............................        3.2(c)
SEC Filings.................................................        4.11
Shares   ...................................................      preamble
Securities..................................................      preamble
Subsidiary Guarantees.......................................        3.2(c)
Unaudited Financials........................................        4.10
</TABLE>





                                       -8-

<PAGE>   13
         1.3      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) 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.

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

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

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

         (i) Unless otherwise indicated, all references herein to "$" or
"dollars" shall refer to U.S. Dollars.


                                   ARTICLE II

                            TERMS OF THE TRANSACTION

         2.1 Agreement to Sell and to Purchase the Securities. At the Closing,
and on the terms and subject to the conditions set forth in this Agreement, the
Company shall issue, allot, sell and deliver to EnCap LP and ECIC, and EnCap LP
and ECIC shall subscribe for, purchase and accept from the Company, the
Securities set forth opposite such Buyer's name below:




                                       -9-

<PAGE>   14




<TABLE>
<S>                                    <C>      <C>                        
EnCap LP                               (1)      $7,312,500 principal amount
$7,500,000                                      of Notes; and

                                       (2)      11,250,000 Ordinary Shares


ECIC                                   (1)      $2,437,500 principal amount
$2,500,000                                      of Notes; and

                                       (2)      3,750,000 Ordinary Shares
</TABLE>


         2.2 Purchase Price and Payment. EnCap LP and ECIC, respectively, shall
pay to the Company at the Closing the aggregate amount set forth below such
Buyer's name in Section 2.1 (collectively, the "Purchase Price"). The Purchase
Price shall be allocated $250,000 to the Shares and $9,750,000 to the Notes for
all purposes, including the filing of any Tax Returns.

         2.3 Placement Fee. At the Closing, the Company shall pay EnCap
Investments L.C. a placement fee, consisting of 545,454 ordinary shares of the
Company (the "Placement Fee Shares").


                                   ARTICLE III

                                     CLOSING

         3.1 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, Texas, at 10 a.m., local time, on October 30,
1998, or 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.

         3.2 Deliveries by the Company. At the Closing, the Company will deliver
the following documents to Buyer:

         (a) A certificate executed on behalf of the Company by an authorized
signatory of the Company, dated the Closing Date, representing and certifying,
in such detail as Buyer may reasonably request, that the conditions set forth in
Sections 8.1 and 8.2 have been fulfilled.

         (b) Opinions of counsel, in form, scope and content reasonably
acceptable to Buyer, of Jenkens & Gilchrist, U.S. counsel to the Company, and
Ashurst Morris & Crisp, U.K. counsel to the Company, dated the Closing Date,
covering the matters set forth on Exhibit 3.2(b) and such other matters as Buyer
may reasonably request.



                                      -10-

<PAGE>   15



         (c) The certificates, instruments and documents listed below:

                  (i) Share certificates in definitive form representing the
         Shares and the Placement Fee Shares, registered in the name of the
         applicable Person and duly executed by the Company.

                  (ii) The Notes, substantially in the form of Exhibit
         3.2(c)(ii) in all material respects, duly executed by the Company.

                  (iii) Subsidiary guarantees substantially in the form of
         Exhibit 3.2(c)(iii) in all material respects (the "Subsidiary
         Guarantees") of each of the Subsidiary Guarantors, duly executed by the
         Subsidiary Guarantors.

                  (iv) A counterpart of a registration rights agreement
         substantially in the form of Exhibit 3.2(c)(iv) in all material
         respects (the "Registration Rights Agreement"), duly executed by the
         Company.

                  (v) Certified copy of a written consent or resolutions of the
         Board of Directors of the Company and the Subsidiary Guarantors
         authorizing the execution, delivery and performance by the Company and
         the Subsidiary Guarantors of this Agreement and the Ancillary
         Documents, as necessary.

                  (vi) Certificates of existence and, for non-U.K. entities,
         good standing with respect to the Company and the Subsidiary
         Guarantors, dated within a number of days prior to the Closing Date
         reasonably acceptable to Buyer.

                  (vii) Such other certificates, instruments, and documents as
         may be reasonably requested by Buyer prior to the Closing Date to carry
         out the intent and purposes of this Agreement.

         3.3      Deliveries by Buyer.  At the Closing, each Buyer will deliver
the following to the Company:

         (a) A certificate executed by an authorized signatory of such 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.

         (b) The portion of the Purchase Price indicated for such Buyer in
Section 2.1, in immediately available funds by a confirmed wire transfer to a
bank account designated in writing by the Company to Buyer no later than two
business days prior to the Closing Date.

         (d)      The certificates, instruments and documents listed below:

                  (i) A counterpart of the Registration Rights Agreement, duly
         executed by such Buyer.



                                      -11-

<PAGE>   16



                  (ii) Such other certificates, instruments, and documents as
         may be reasonably requested by the Company prior to the Closing Date to
         carry out the intent and purposes of this Agreement.


                                   ARTICLE IV

                    REPRESENTATIONS AND WARRANTIES OF SELLER

         The Company represents and warrants to Buyer that:

         4.1 Corporate Organization. The Company is a public limited company
duly organized and validly existing under the laws of England and Wales.

         4.2 Qualification. Each of the Company and the Subsidiaries is duly
qualified or licensed to do business and, with respect to non-U.K. entities, 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.

         4.3 Charter and Bylaws. The Company has made available to Buyer
accurate and complete copies of the Company's certificate of incorporation,
bylaws, memorandum and articles of association or equivalent organizational
documents ("Organic Documents") as currently in effect, and stock records of the
Company. Neither the Company nor any Subsidiary is in violation of its Organic
Documents or its partnership agreement or similar governing document, as the
case may be.

         4.4 Capitalization of the Company. The authorized capital stock of the
Company, the number of shares outstanding and the number of shares held in the
Company's treasury are set forth on Schedule 4.4 hereto. 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. Except as
set forth on Schedule 4.4 hereto, 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. 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. Except as set
forth on Schedule 4.4, the Company is not a party to, and is not aware of, any
voting agreement, voting trust, or similar agreement or arrangement relating to
any class or series of its capital stock.




                                      -12-

<PAGE>   17



         4.5 Authority Relative to This Agreement. The Company has full power
and authority to execute, deliver, and, upon Shareholder Approval, perform this
Agreement and the Ancillary Documents, including the Notes, to which it is a
party and to consummate the transactions contemplated hereby and thereby. The
execution, delivery, and (upon Shareholder Approval) performance by the Company
of this Agreement and the Ancillary Documents, including the Notes, 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 action of the Company.
This Agreement has been duly executed and delivered by the Company and
constitutes, and each Ancillary Document, including the Notes, executed or to be
executed by the Company has been, or when executed will be, duly executed and
delivered by the Company and constitutes, or when executed and delivered will
constitute, a valid and legally binding obligation 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.

         4.6 No Conflict. Assuming all consents, approvals, authorizations and
other actions described in Section 4.7 have been obtained and all filings and
notifications listed on Schedule 4.7 have been made, and except as described on
Schedule 4.6 and for Shareholder Approval, the execution, delivery and
performance of this Agreement by the Company, the execution, delivery and
performance by each Subsidiary of the Ancillary Documents to which it is a
party, and the consummation by them of the transactions contemplated hereby and
thereby do not and will not (a) violate or conflict with the Organic Documents
of the Company or any Subsidiary, (b) conflict with or result in any 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 Lien upon the properties of the Company or any Subsidiary
(other than as provided in the Senior Credit Facility) or (iv) violate any
Applicable Law binding upon the Company or any Subsidiary.

         4.7 Consents and Approvals, Licenses, Etc. Except for Shareholder
Approval and as set forth on Schedule 4.7, no consent, approval, authorization,
license, order or permit of, or declaration, filing or registration with, or
notification to, any Governmental Entity, or any other Person or entity, is
required to be made or obtained by the Company or any Subsidiary in connection
with the execution, delivery and performance of this Agreement or any Ancillary
Document and the consummation of the transactions contemplated hereby and
thereby.

         4.8      Subsidiaries

         (a) The Company does not own, directly or indirectly, any capital stock
or equity securities of any corporation or have any direct or indirect equity or
ownership interest in any other



                                      -13-

<PAGE>   18



Person, other than the Subsidiaries. Schedule 4.8 lists each Subsidiary, the
jurisdiction of incorporation or formation of each Subsidiary and the authorized
(in the case of capital stock) and outstanding capital stock or other equity
interests of each Subsidiary. Each U.K. Subsidiary is a duly formed and validly
existing under the laws of the jurisdiction of its formation, and each other
Subsidiary is a corporation duly organized, validly existing and in good
standing under the laws of the jurisdiction of its incorporation. Each
Subsidiary has all requisite corporate or other, as applicable, power and
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.

         (b) Except as otherwise indicated on Schedule 4.8, 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 Liens. All outstanding shares
of capital stock of each corporate Subsidiary have been validly issued and are
fully paid and nonassessable. All equity interests of each other Subsidiary have
been validly issued and are fully paid (to the extent required at such time). 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 4.8, 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.

         (d) Each of the Subsidiary Guarantors has full power and authority to
execute, deliver, and, upon Shareholder Approval, perform the Subsidiary
Guarantee and other Ancillary Documents to which it is a party and to consummate
the transactions contemplated thereby. The execution, delivery, and (upon
Shareholder Approval) performance by each of the Subsidiary Guarantors of the
Subsidiary Guarantee and other Ancillary Documents to which it is a party, and
the consummation by it of the transactions contemplated thereby, have been duly
authorized by all necessary action of such Subsidiary Guarantor. The Subsidiary
Guarantees and each Ancillary Document executed or to be executed by the
Subsidiary Guarantors has been, or when executed will be, duly executed and
delivered by the Subsidiary Guarantors and constitutes, or when executed and
delivered will constitute, a valid and legally binding obligation of the
Subsidiary Guarantors, enforceable against the Subsidiary Guarantors 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.

         4.9 Shares. Upon Shareholder Approval, the Shares and the Placement Fee
Shares to be



                                      -14-

<PAGE>   19



issued by the Company at the Closing will have been duly authorized for such
issuance and, when issued and delivered by the Company in accordance with the
provisions of this Agreement, will be validly issued, fully paid, and
nonassessable. The issuance of the Shares and the Placement Fee Shares under
this Agreement is not subject to any preemptive or similar rights. Upon
fulfillment of the Company's obligations under Section 14.3 hereto and assuming
compliance by Buyer with all applicable requirements of Regulation S under the
Exchange Act, the Shares and Placement Fee Shares will be tradable on the London
Stock Exchange.

         4.10 Financial Statements. The Company has delivered to Buyer accurate
and complete copies of (i) the Company's audited consolidated balance sheet as
of April 30, 1998, and the related audited consolidated statements of income,
stockholders' equity and cash flows for the year then ended, and the notes and
schedules thereto, together with the unqualified report thereon of KPMG Audit
Plc, independent public accountants (the "Audited Financial Statements") and
(ii) the Company's unaudited consolidated balance sheet as of July 31, 1998 (the
"Latest Balance Sheet"), and the related unaudited consolidated statements of
income, stockholders' equity, and cash flows for the three-month period then
ended (the "Unaudited Financial Statements"), certified by the Company's chief
financial officer (collectively, the "Financial Statements"). The Financial
Statements (i) represent actual bona fide transactions, (ii) have been prepared
from the books and records of the Company and its consolidated Subsidiaries in
conformity with U.S. GAAP accounting principles applied on a basis consistent
with preceding years throughout the periods involved and (iii) fairly present
the Company's consolidated financial position as of the respective dates thereof
and its consolidated results of operations and cash flows for the periods then
ended. The statements of income included in the Financial Statements do not
contain any items of special or nonrecurring income except as identified in the
notes thereto, and the balance sheets included in the Financial Statements do
not reflect any write-up or revaluation increasing the book value of any assets,
nor have there been any transactions since the date of the Latest Balance Sheet
giving rise to special or nonrecurring income or any such write-up or
revaluation.

         4.11 SEC Filings. The Company has filed with the Securities and
Exchange Commission, the London Stock Exchange and the Registrar of Companies
all forms, reports, schedules, statements and other documents required to be
filed by it since May 1, 1996 under the Companies Act and the Listing Rules and
since April 30, 1997 under the Securities Act, the Exchange Act and all other
federal securities laws. All final forms, reports, schedules, statements and
other documents (including all amendments thereto) filed by the Company with the
Securities and Exchange Commission and the London Stock Exchange since such date
are herein collectively referred to as the "SEC Filings". The Company has
delivered to Buyer accurate and complete copies of all the SEC Filings in the
form filed by the Company with the Securities and Exchange Commission and the
London Stock Exchange. The SEC Filings, at the time filed, complied in all
material respects with all applicable requirements of federal securities laws.
None of the SEC Filings, including, without limitation, any financial statements
or schedules included therein, at the time filed, contained any untrue statement
of a material fact or omitted to state any material fact required to be stated
therein or necessary in order to make the statements contained therein, in light
of the circumstances under which they were made, not misleading. All material
contracts of the Company and the Subsidiaries have been included in the SEC
Filings, except for those contracts not required to be filed pursuant to the
rules and regulations of the Securities and Exchange Commission and the



                                      -15-

<PAGE>   20



London Stock Exchange. The Company shall deliver to Buyer as soon as they become
available accurate and complete copies of all forms, reports, and other
documents furnished by it to its shareholders generally or filed by it with the
Securities and Exchange Commission and the London Stock Exchange subsequent to
the date hereof and prior to the Closing Date.

         4.12 Absence of Undisclosed Liabilities. Neither the Company nor any
Subsidiary has any liability or obligation (whether accrued, absolute,
contingent, unliquidated, or otherwise, whether or not known to the Company or
any Subsidiary, and whether due or to become due), except (i) liabilities
reflected on the Latest Balance Sheet, (ii) liabilities which have arisen since
the date of the Latest Balance Sheet in the ordinary course of business (none of
which is a material liability for breach of contract, breach of warranty, tort,
or infringement), (iii) liabilities arising under executory contracts entered
into in the ordinary course of business (none of which is a material liability
for breach of contract) and (iv) liabilities specifically set forth on Schedule
4.12.

         4.13 Absence of Certain Changes. Except as disclosed on Schedule 4.13,
since the date of the Latest Balance Sheet, (i) there has not been any material
adverse change in, or any event or condition that might reasonably be expected
to result in a 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; (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 6.2 except as permitted
thereunder.

         4.14     Tax Matters.  Except as disclosed on Schedule 4.14:

         (a) The Company and each Subsidiary has filed, or has had filed on its
behalf, in a timely manner (within any applicable extension periods) with the
appropriate taxing authority all Tax Returns with respect to Taxes of the
Company and of each of the Subsidiaries, all of which Tax Returns are true,
correct and complete in all material respects;

         (b) All Taxes due and payable (whether or not reflected in Tax Returns
as filed) with respect to all taxable periods of the Company and the
Subsidiaries have been paid in full or adequate reserves have been provided for
on the Financial Statements;

         (c) There are no outstanding agreements or waivers extending the
statutory period of limitations applicable to any federal, state, local or
foreign income or other material Tax Returns required to be filed by or with
respect to the Company or any of the Subsidiaries;

         (d) None of the Tax Returns of or with respect to the Company or any of
the Subsidiaries is currently being audited or examined by any taxing authority;




                                      -16-

<PAGE>   21



         (e) No material deficiency for any Taxes has been assessed with respect
the Company or to any of the Subsidiaries that has not either (i) been abated or
(ii) paid in full or for which adequate reserves have been provided;

         (f)      No Tax litigation is currently pending;

         (g) No waiver or extension of any statute of limitations to any
federal, state, local or foreign Tax matter has been given by or requested from
the Company or any Subsidiary; and

         (h) Neither the Company nor any Subsidiary has filed a consent under
Section 341(f) of the Code.

         (i) The Company and the Subsidiaries have complied with all Applicable
Laws relating to the withholding of Taxes and the payment thereof (including,
without limitation, withholding of Taxes under Sections 1441 and 1442 of the
Code, or similar provisions under foreign laws), and has timely and properly
withheld from the appropriate party and paid over to the proper Governmental
Entity all amounts required to be withheld and be paid over under Applicable
Law.

         (j) Neither the Company nor any Subsidiary is required to include in
income any adjustment under Section 481(a) of the Code by reason of a change in
accounting method, and neither the Company nor any Subsidiary, nor the Internal
Revenue Service, has proposed any such adjustment or change in accounting
method. The Company and the Subsidiaries do not have pending any private letter
ruling with the IRS.

         (k) Other than as a result of this transaction, none of the Company's
or any Subsidiary's tax attributes is subject to the limitations of Section 382,
383 or 384 of the Code or Temporary Treasury Regulation Sections 1.1502-15T or
1.1502-21T(c).

         (l) There are no liens for Taxes upon any assets of the Company or any
Subsidiary, except liens for Taxes not yet due and payable.

         (m) The tax basis of each of the assets of the Company and the
Subsidiaries as set forth on the books, accounts and records of the Company and
the Subsidiaries is true, correct and complete in all material respects.

         4.15 Environmental and Other Laws. Except as disclosed on Schedule 4.15
or in the SEC Filings filed prior to the date hereof, (a) the Company and the
Subsidiaries are conducting their businesses in compliance in all material
respects with all Applicable Laws, including all Environmental Laws, and are in
material compliance with all licenses and permits required under any such laws;
(b) to the best of the Company's knowledge, none of the operations or properties
of the Company or any Subsidiary is the subject of foreign, federal, state or
local investigation evaluating whether any material remedial action is needed to
respond to a release of any Hazardous Materials into the environment or to the
improper storage or disposal (including storage or disposal at offsite
locations) of any Hazardous Materials; (c) neither the Company nor any
Subsidiary has filed any notice under any Applicable Law indicating that it is
responsible for the improper release



                                      -17-

<PAGE>   22



into the environment, or the improper storage or disposal, of any material
amount of any Hazardous Materials or that any Hazardous Materials have been
improperly released, or are improperly stored or disposed of, upon any property
of the Company or any Subsidiary; (d) neither the Company nor any Subsidiary has
transported or arranged for the transportation of any Hazardous Material to any
location which is (i) listed on the National Priorities List under the
Comprehensive Environmental Response, Compensation and Liability Act of 1980, as
amended, listed for possible inclusion on such National Priorities List by the
Environmental Protection Agency in its Comprehensive Environmental Response,
Compensation and Liability Information System List, or listed on any similar
state list or foreign jurisdiction list or (ii) the subject of foreign, federal,
state or local enforcement actions or other investigations which may lead to
material claims against the Company or any Subsidiary for clean-up costs,
remedial work, damages to natural resources or for personal injury claims
(whether under Environmental Laws or otherwise); and (e) to the best of the
Company's knowledge, neither the Company or any Subsidiary has any material
contingent liability under any Environmental Laws or in connection with the
release into the environment, or the storage or disposal, of any Hazardous
Materials.

         4.16 Legal Proceedings. Except as disclosed on Schedule 4.16, 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
which, individually or in the aggregate, might reasonably be expected to have a
Material Adverse Effect. 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. 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, or questioning the legality or validity of, this Agreement or any
Ancillary Document or the transactions contemplated hereby or thereby.

         4.17     Title to Properties; Permits; Licenses; Condition of Assets.

         (a) Each of the Company and the Subsidiaries has good and defensible
title to all of its material properties and assets, free and clear of all Liens
other than Permitted Liens and of all material impediments to the use of such
properties and assets in the businesses of the Company and the Subsidiaries.

         (b) Each of the Company and the Subsidiaries holds all material Permits
necessary or required for the conduct of its business. Each of such Permits is
in full force and effect, the Company and the Subsidiaries are in compliance
with all of its material obligations with respect thereto, and, to the best
knowledge of the Company, no event has occurred which allows, or with or without
the giving of notice or the passage of time or both would allow, the revocation
or termination of any thereof. 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 any Subsidiary
to have any material Permit.

         (c) The Company and the Subsidiaries possess all licenses, permits,
franchises, patents,



                                      -18-

<PAGE>   23



copyrights, trademarks and trade names, and other intellectual property (or
otherwise possesses the right to use such intellectual property without
violation of the rights of any other Person) which are necessary to carry out
their businesses as presently conducted and as presently proposed to be
conducted hereafter, and neither the Company nor any Subsidiaries is in
violation in any material respect of the terms under which it possesses such
intellectual property or the right to use such intellectual property.

         (d) The equipment and other tangible assets of the Company and the
Subsidiaries are in good operating condition (except for reasonable wear and
tear), and have been reasonably maintained.

         (e) The Company has conducted a reasonable and prudent due diligence
investigation of the assets to be acquired pursuant to the Burlington Agreement,
and, to the best knowledge of the Company, the representations and warranties of
Burlington Resources (Irish Sea) Limited in the Burlington Agreement are true
and correct in all material respects.

         4.18     ERISA.

         (a) Set forth on Schedule 4.18 is a list identifying each "employee
benefit plan", as defined in Section 3(3) of ERISA, (i) which is subject to any
provision of ERISA, (ii) which is 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. The Company has
delivered or made available to Buyer accurate and complete copies of such plans
(and, if applicable, the related trust agreements) and all amendments thereto
and written interpretations thereof, together with (i) the three most recent
annual reports (Form 5500 including, if applicable, Schedule B thereto) prepared
in connection with any such plan and (ii) the most recent actuarial valuation
report prepared in connection with any such plan. Such plans are referred to in
this Section as the "Employee Plans". 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. The
only Employee Plans which individually or collectively would constitute an
"employee pension benefit plan" as defined in Section 3(2) of ERISA are
identified as such on Schedule 4.18.

         (b) Except as otherwise identified on Schedule 4.18, (i) no Employee
Plan constitutes a "multiemployer plan", as defined in Section 3(37) of ERISA
(for purposes of this Section, a "Multiemployer Plan"), (ii) no Employee Plan is
maintained in connection with any trust described in Section 501(c)(9) of the
Code, (iii) no Employee Plan is subject to Title IV of ERISA or to the minimum
funding standards of ERISA and the Code, and (iv) during the past five years,
neither the Company nor any of its affiliates have made or been required to make
contributions to any Multiemployer Plan. There are no accumulated funding
deficiencies as defined in Section 412 of the Code (whether or not waived) with
respect to any Employee Plan. The fair market value of the assets held with
respect to each Employee Plan which is an employee pension benefit plan, as
defined in Section 3(2) of ERISA, exceeds the actuarially determined present
value of all benefit liabilities accrued under such Employee Plan (whether or
not vested) determined using reasonable



                                      -19-

<PAGE>   24



actuarial assumptions. Neither the Company nor any affiliate of the Company has
incurred any material liability under Title IV of ERISA arising in connection
with the termination of, or complete or partial withdrawal from, any plan
covered or previously covered by Title IV of ERISA. The Company and all of the
affiliates of the Company have paid and discharged promptly when due all
liabilities and obligations arising under ERISA or the Code of a character which
if unpaid or unperformed might result in the imposition of a lien against any of
the assets of the Company or any Subsidiary. Nothing done or omitted to be done
and no transaction or holding of any asset under or in connection with any
Employee Plan has or will make the Company or any Subsidiary or any director or
officer of the Company or any Subsidiary subject to any liability under Title I
of ERISA or liable for any Tax pursuant to Section 4975 of the Code that could
have a Material Adverse Effect. There are no threatened or pending claims by or
on behalf of the Employee Plans, or by any participant therein, alleging a
breach or breaches of fiduciary duties or violations of Applicable Laws which
could result in liability on the part of the Company, its officers or directors,
or such Employee Plans, under ERISA or any other Applicable Law and there is no
basis for any such claim.

         (c) Each Employee Plan which is intended to be qualified under Section
401(a) of the Code is so qualified and has been so qualified since the date of
its adoption, and each trust forming a part thereof is exempt from Tax pursuant
to Section 501(a) of the Code. Set forth on Schedule 4.18
 is a list of the most recent IRS determination letters with respect to any such
Plans, accurate and complete copies of which letters have been delivered or made
available to Buyer. Each Employee Plan has been maintained in compliance with
its terms and with the requirements prescribed by all Applicable Laws, including
but not limited to ERISA and the Code, which are applicable to such Employee
Plans.

         (d) Set forth on Schedule 4.18 is a list of each employment, severance,
or other similar contract, arrangement, or policy and each plan or arrangement
(written or oral) providing for insurance coverage (including any self-insured
arrangements), workers' compensation, disability benefits, supplemental
unemployment benefits, vacation benefits, retirement benefits, deferred
compensation, profit-sharing, bonuses, stock options, stock appreciation rights,
or other forms of incentive compensation or post-retirement insurance,
compensation, or benefits which (i) is not an Employee Plan, (ii) is entered
into, maintained, or contributed to, as the case may be, by the Company or any
affiliate of the Company, and (iii) 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. Such contracts, plans, and
arrangements as are described in the preceding sentence are referred to for
purposes of this Section as the "Benefit Arrangements". Each Benefit Arrangement
has been maintained in substantial compliance with its terms and with the
requirements prescribed by Applicable Laws.

         (e) Neither the Company nor any affiliate of the Company has performed
any act or failed to perform any act, and there is no contract, agreement, plan,
or arrangement covering any employee or former employee of the Company or any
affiliate of the Company, that, individually or collectively, could give rise to
the payment of any amount that would not be deductible pursuant to the terms of
Section 162(a)(1) or 280G of the Code, or could give rise to any penalty or
excise Tax pursuant to Section 4980B or 4999 of the Code.



                                      -20-

<PAGE>   25



         4.19     Agreements.

         (a) Set forth on Schedule 4.19 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;

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

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

                  (iv) exclusive of those relating to the Senior Credit
         Facility, 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 that has the economic
         effect although not the legal form of any of the foregoing;

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

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

                  (vii) exclusive of oil, gas and mineral leases, agreements
         with respect to the lease of real or personal property;

                  (viii) exclusive of oil and gas operating or similar
         agreements, agreements concerning the management or operation of any
         real property;

                  (ix) partnership, joint venture, and profit sharing
         agreements;

                  (x)   agreements with any Governmental Entity;

                  (xi)  agreements relating to the release or disposal of
         Hazardous Material;

                  (xii) 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, other than those that would not have a Material Adverse
         Effect;




                                      -21-

<PAGE>   26



                  (xiii) agreements not made in the ordinary course of business;
         and

                  (xiv) 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 delivered or made available to Buyer accurate and
complete copies of the agreements listed in Schedule 4.19. 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 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. 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 agreement to exercise any right of
offset with respect to, or any right to cancel or terminate, any agreement, and
neither the Company nor any Subsidiary knows of any fact or circumstance that
would justify the exercise by any such other party of such a right other than
the automatic termination of such agreement in accordance with its terms.
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.

         (d) Without limiting the generality of the other provisions in this
Section 4.19, the Key Employment Agreements are in full force and effect, and
each of John Keenan, Paul Fenemore and Harry Brian Kerr Williams is currently
employed by the Company pursuant to a renewal term under such agreements.

         4.20 Labor Disputes and Acts of God. Neither the business nor the
properties of the Company nor any Subsidiary has been affected by any fire,
explosion, accident, strike, lockout or other labor dispute, drought, storm,
hail, earthquake, embargo, act of God or of the public enemy or other casualty
(whether or not covered by insurance), which, individually or in the aggregate,
could cause a Material Adverse Effect.

         4.21 Registration Rights. As of the date hereof, the Company has no
obligation to register any of its securities (including debt securities) under
the Securities Act, the Listing Rules or applicable similar foreign laws or
regulations. As of the Closing Date, except pursuant to the Registration Rights
Agreement and as set forth on Schedule 4.21, the Company will have no obligation
to register any of its securities (including debt securities) under the
Securities Act, the



                                      -22-

<PAGE>   27



Listing Rules or applicable similar foreign laws or regulations.

         4.22 Offering of Securities. All securities which have been offered or
sold by the Company have been registered pursuant to the Securities Act and
applicable foreign and state securities laws or were offered and sold pursuant
to valid exemptions therefrom.

         4.23 Government Regulation. The Company is not subject to regulation
under the Public Utility Holding Company Act of 1935. The Company is not an
"investment company" or a company "controlled" by an "investment company" within
the meaning of the Investment Company Act of 1940, as amended, or an "investment
advisor" within the meaning of the Investment Advisers Act of 1940, as amended.

         4.24 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, which action would subject Buyer or any of
its affiliates to any liability. The Company shall indemnify and hold harmless
Buyer 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.

         4.25      Solvency.

         (a) No order has been made or resolution passed for the winding up of
the Company and/or any of its Subsidiaries and there is not outstanding (i) any
petition or order for the winding up of the Company or any of its Subsidiaries;
(ii) any receivership of the whole or any part of the Company or any of its
Subsidiaries; (iii) any petition or order for the administration of the Company
or any of its Subsidiaries; or (iv) any voluntary arrangement between the
Company or any of its Subsidiaries.

         (b) There are no circumstances which are known, or would on reasonable
inquiry be known, to the Company or any of its Subsidiaries which would entitle
any person to present a petition for the winding up or administration of the
Company or any of its Subsidiaries or to appoint a receiver of the whole or any
part of its undertaking or assets.

         (c) Neither the Company nor any of its Subsidiaries is deemed unable to
pay its debts within the meaning of Section 1.23 of the Insolvency Act 1986.

         (d) No event analogous to any of the matters set out in this Section
4.25 has occurred outside England and Wales.

         4.26 Full 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 or its
representatives to Buyer pursuant


                                      -23-

<PAGE>   28



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 (other than industry-wide risks
normally associated with the type of business conducted by the Company)
necessary to make the statements contained therein, in light of the
circumstances in which they are made, not misleading. There is no fact known to
the Company (other than industry-wide risks normally associated with the type of
business conducted by the Company) that has not been disclosed to Buyer in
writing which the Company reasonably anticipates would result in a Material
Adverse Effect.


                                    ARTICLE V

                     REPRESENTATIONS AND WARRANTIES OF BUYER

         Each of EnCap LP and ECIC hereby severally and as to itself represents
and warrants to the Company that (as used in this Article V the term "Buyer"
shall be deemed to mean only the Person making such representation or warranty):

         5.1 Corporate Organization. Buyer is duly organized and validly
existing under the laws of the jurisdiction of its formation.

         5.2 Authority Relative to This Agreement. 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 Buyer 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 action of Buyer. This Agreement has been
duly executed and delivered by Buyer and constitutes, and each Ancillary
Document executed or to be executed by Buyer has been, or when executed will be,
duly executed and delivered by Buyer and constitutes, or when executed and
delivered will constitute, a valid and legally binding obligation of Buyer,
enforceable against Buyer 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.

         5.3 Investment Intent; Investment Experience; Restricted Securities.
Buyer is acquiring the Securities 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. In acquiring the Securities, Buyer is
not offering or selling, and will not offer or sell, for the Company in
connection with any distribution of the Securities, and Buyer does not have a
participation and will not participate in any such undertaking or in any
underwriting of such an undertaking except in compliance with applicable federal
and state securities laws. Buyer acknowledges that it is able to fend for
itself, can bear the economic risk of its investment in the Securities, 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 Securities.
Buyer understands that the Securities will not have been registered pursuant to
the



                                      -24-

<PAGE>   29



Securities Act or any applicable state securities laws, that the Securities will
be characterized as "restricted securities" under federal securities laws and
that under such laws and applicable regulations the Securities cannot be sold or
otherwise disposed of without registration under the Securities Act or an
exemption therefrom.

         5.4 Brokerage Fees. Neither Buyer 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, which action would subject the Company or
any of its affiliates to any liability. Buyer shall indemnify 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 Buyer or any of its affiliates.



                                   ARTICLE VI

                       CONDUCT OF COMPANY PENDING CLOSING

         The Company hereby covenants and agrees with Buyer as follows:

         6.1 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.

         6.2 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) except as provided in the Notice of Extraordinary Meeting
         dated October 7, 1998 contained in the Listing Particulars, amend its
         Organic Documents or other governing instruments;

                  (b) (i) except as provided (A) in the Notice of Extraordinary
         Meeting dated October 7, 1998 contained in the Listing Particulars or
         (B) in Section 6.3 hereof, 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



                                      -25-

<PAGE>   30



         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) except as provided in the Notice of Extraordinary
         Meeting dated October 7, 1998 contained in the Listing Particulars,
         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,
         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 customary loans or advances to employees in
         amounts not material to the maker of such loan or advance); (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;

                  (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;

                  (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;




                                      -26-

<PAGE>   31



                  (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 the date of the Latest Balance Sheet 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 the Difco Agreement, the Burlington Agreement or the
         Senior Credit Facility;

                  (m) amend, modify, or change any existing lease, contract or
         agreement (exclusive of the contracts described in subsection (l)),
         other than in the ordinary course of business consistent with past
         practice;

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

                  (o) change any of the accounting principles or practices used
         by it;

                  (p) 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

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

         6.3 Certain Action. Notwithstanding the foregoing provisions of this
Article VI, the Acquisitions and the transactions contemplated by the Senior
Credit Facility may be consummated as provided in this Agreement.




                                      -27-

<PAGE>   32
                                   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 Buyer 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 on
and as of the Closing Date as if made on and as of such date, except as affected
by transactions permitted by this Agreement, including the Acquisitions, the
Senior Credit Facility and the receipt of Shareholder Approval, 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. For the sole purpose
of determining whether or not any of such representations and warranties are
true and correct as aforesaid on and as of the Closing Date, no effect shall be
given to any materiality qualification contained in such representation or
warranty.

         7.2 Covenants and Agreements Performed. Buyer 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, and all deliveries contemplated by Section 3.3 shall have been made.

         7.3 HSR Act. All waiting periods (and any extensions thereof)
applicable to this Agreement and the transactions contemplated hereby under the
HSR Act shall have expired or been terminated.

         7.4 Legal Proceedings. No preliminary or permanent injunction or other
order, decree or ruling issued by a Governmental Entity or any securities
exchange, and no statute, rule, regulation or executive order promulgated,
enacted or issued by a Governmental Entity or any securities exchange, shall be
in effect which restrains, enjoins, prohibits or otherwise makes illegal or
improper the consummation of the transactions contemplated hereby.


                                  ARTICLE VIII

                       CONDITIONS TO OBLIGATIONS OF BUYER

         The obligations of Buyer 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 in all material respects on
and as of the Closing Date as if made on and as of such date, except as affected
by transactions permitted by this Agreement, including the Acquisitions, the
Senior Credit Facility and the receipt of Shareholder Approval, and except to
the extent that any such



                                      -28-

<PAGE>   33



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. For the sole purpose of determining whether
or not any of such representations and warranties are true and correct as
aforesaid on and as of the Closing Date, no effect shall be given to any
materiality qualification contained in such representation or warranty.

         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, and all deliveries contemplated by Section 3.2
shall have been made.

         8.3 HSR Act. All waiting periods (and any extensions thereof)
applicable to this Agreement and the transactions contemplated hereby under the
HSR Act shall have expired or been terminated.

         8.4 Legal Proceedings. No preliminary or permanent injunction or other
order, decree or ruling issued by a Governmental Entity or any securities
exchange, and no statute, rule, regulation or executive order promulgated,
enacted or issued by a Governmental Entity or any securities exchange, shall be
in effect which restrains, enjoins, prohibits or otherwise makes illegal the
consummation of the transactions contemplated hereby.

         8.5 Consents. There shall have been obtained the Shareholder Approval
and any and all consents, approvals, authorizations, licenses, orders or permits
set forth on Schedule 4.7; and no other consent, approval, authorization,
license, order or permit of, or declaration, filing or registration with, or
notification to, any Governmental Entity, or any other Person or entity, the
failure to comply with which would have a Material Adverse Effect, shall be
required to be made or obtained by the Company or any Subsidiary in connection
with the execution, delivery and performance of this Agreement and the
consummation of the transactions contemplated hereby.

         8.6 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.

         8.7 Senior Credit Facility. The Company, Alliance USA, GOCA, LPC, New
GOC and Source shall have executed and delivered the Senior Credit Facility,
substantially in the form of the final draft furnished to Buyer in all material
respects.

         8.8 Subordination Agreement. Buyer and the lender under the Senior
Credit Facility shall have executed and delivered a materially acceptable
subordination agreement.

         8.9 U.K. Opinion. Buyer shall have received an opinion of Richards
Butler dated the Closing Date and in form and substance satisfactory to Buyer
concerning choice of law and such other matters as Buyer may request.




                                      -29-

<PAGE>   34



         8.10 Closing of the Acquisitions and the Senior Credit Facility. All
conditions precedent to the closings of the Acquisitions and the Senior Credit
Facility (other than conditions with respect to the consummation, simultaneously
with such closings, of the transactions contemplated hereby) shall have been
satisfied at or prior to the Closing, and such closings shall have occurred
prior to or be occurring simultaneously with the Closing.


                                   ARTICLE IX

                             PRE-CLOSING TERMINATION

         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 Buyer; or

                  (b) by either the Company or Buyer, if any Governmental Entity
         with jurisdiction over such matters shall have issued an order or
         injunction restraining, enjoining or otherwise prohibiting the sale of
         the Securities or the Placement Fee Shares hereunder and such order,
         decree, ruling or other action shall have become final and
         unappealable;

                  (c) by either Company or Buyer, if the Closing shall not have
         occurred on or before October 30, 1998; provided, however, that the
         right to terminate this Agreement under this Section 9.1(c) shall not
         be available to any party whose failure to fulfill any obligation under
         this Agreement shall have been the cause of, or shall have resulted in,
         the failure of the Closing to occur prior to such date.

         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, in Sections 14.6 and 14.7 and in Article XV 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.


                                    ARTICLE X

                      AFFIRMATIVE COVENANTS OF THE COMPANY

         To induce Buyer to enter into this Agreement, the Company warrants,
covenants and agrees that until the full and final payment of the Obligations:

         10.1 Payment and Performance. The Company will pay all amounts due
under the Notes in accordance with the terms thereof and will observe, perform
and comply with every covenant,


                                      -30-

<PAGE>   35



term and condition expressed or implied in this Agreement. The Company will
cause each of its Subsidiaries to observe, perform and comply with every such
term, covenant and condition to the extent applicable to such Subsidiary.

         10.2 Books, Financial Statements and Reports. The Company and each of
its Subsidiaries will at all times maintain full and accurate books of account
and records. The Company will maintain and will cause its Subsidiaries to
maintain a standard system of accounting, will maintain its Fiscal Year, and
will furnish the following statements and reports to Buyer at the Company's
expense:

         (a) As soon as available, and in any event within one hundred five
(105) days after the end of each Fiscal Year, complete consolidated financial
statements of the Company together with all notes thereto, prepared in
reasonable detail in accordance with U.S. GAAP, together with an unqualified
opinion, based on an audit using generally accepted auditing standards, by
independent certified public accountants selected by the Company and reasonably
acceptable to Buyer, stating that such consolidated financial statements have
been so prepared. These financial statements shall contain a consolidated
balance sheet as of the end of such Fiscal Year and consolidated statements of
earnings, of cash flows, and of changes in owners' equity for such Fiscal Year,
each setting forth in comparative form the corresponding figures for the
preceding Fiscal Year.

         (b) As soon as available, and in any event within fifty (50) days after
the end of each Fiscal Quarter, the Company's consolidated balance sheet as of
the end of such Fiscal Quarter and consolidated statements of the Company's
earnings and cash flows for the period from the beginning of the then current
Fiscal Year to the end of such Fiscal Quarter, all in reasonable detail and
prepared in accordance with U.S. GAAP, subject to changes resulting from normal
year-end adjustments. In addition the Company will, together with each such set
of financial statements and each set of financial statements furnished under
subsection (a) of this section, furnish a certificate in a form reasonably
acceptable to Buyer signed by the chief financial officer of the Company stating
that such financial statements are accurate and complete (subject to normal
year-end adjustments) and stating that no Default exists at the end of such
Fiscal Quarter or at the time of such certificate or specifying the nature and
period of existence of any such Default.

         (c) Promptly upon their becoming available, copies of all financial
statements, reports, notices and proxy statements sent by the Company to its
stockholders and all registration statements, periodic reports and other
statements and schedules filed by the Company with any securities exchange, the
Securities and Exchange Commission or any similar Governmental Entity.

         (d) Annually within 60 days after the end of each Fiscal Year beginning
with the Fiscal Year ending April 30, 1999, a report containing (i) an
estimation of the oil and gas reserves, classified by appropriate categories, as
of the end of the preceding fiscal year attributable to the interest of the
Company therein, (ii) a projection of the rate of production of and net income
from such reserves with respect to each such interest, (iii) a calculation of
the present worth of such net income discounted at a rate of 10% and at any
other rates designated from time to time by a Majority of the Noteholders and
(iv) a schedule or complete description of all assumptions, estimates and
projections made or used in the preparation of such report. Each such report
shall be prepared in



                                      -31-

<PAGE>   36



accordance with customary and generally accepted standards and practices for
petroleum engineers, and shall be based on (1) prices determined by a Majority
of the Noteholders, (2) lease operating expenses and production taxes derived
from and consistent with those actually incurred by the Company, escalated at
the same rate, if any, being applied to prices and (3) such other assumptions as
shall be designated by a Majority of the Noteholders. In addition to the
foregoing, a Majority of the Noteholders shall have the right from time to time
to cause the independent petroleum engineer referenced below to prepare an
additional report of the type described above, not to exceed one additional
report in any one calendar year, in which event all fees and expenses incurred
in connection with obtaining such additional report shall be paid by the
Company. Each report under this subsection shall be prepared by an independent
petroleum engineer designated by the Company and approved by a Majority of the
Noteholders. Each annual report referenced above shall also include an estimate
of the Company's proved oil and gas reserves (as defined in Regulation S-X
promulgated by the Securities and Exchange Commission) and a calculation of the
"present value of estimated future net revenues" from such proved oil and gas
reserves, with such present worth calculation to be made in accordance with
Regulation S-X, as promulgated by the Securities and Exchange Commission.

         (e) Promptly, such other information with respect to the business and
operations of the Company and its Subsidiaries, as Buyer may reasonably request.

         10.3 Notice of Material Events and Change of Address. The Company will
promptly notify Buyer in writing, stating that such notice is being given
pursuant to this Agreement, of:

                  (a)  the occurrence of any Material Adverse Effect,

                  (b)  the occurrence of any Default,

                  (c) the acceleration of the maturity of any indebtedness owed
         by the Company or any Subsidiary thereof or of any default by any the
         Company or any such Subsidiary under any indenture, mortgage,
         agreement, contract or other instrument to which any of them is a party
         or by which any of them or any of their properties is bound, if such
         acceleration or default could reasonably be expected to have a Material
         Adverse Effect,

                  (d) any claim of $100,000 or more, any notice of potential
         liability under any Environmental Laws which might exceed such amount,
         or any other material adverse claim asserted against the Company or any
         Subsidiary thereof or with respect to the Company or any of such
         Subsidiary's properties, and

                  (e) the filing of any suit or proceeding against the Company
         or any Subsidiary thereof in which an adverse decision could cause a
         Material Adverse Effect.

Upon the occurrence of any of the foregoing the Company and any Subsidiary
thereof will take all necessary or appropriate steps to remedy promptly any such
Material Adverse Effect, Default, acceleration or default, to protect against
any such adverse claim, to defend any such suit or proceeding, and to resolve
all controversies on account of any of the foregoing.



                                      -32-

<PAGE>   37



         10.4 Maintenance of Properties. The Company and each of its
Subsidiaries will maintain, preserve, protect, and keep all property used or
useful in the conduct of its business in good condition and in compliance with
all Applicable Laws, and will from time to time make all repairs, renewals and
replacements needed to enable the business and operations carried on in
connection therewith to be promptly and advantageously conducted at all times.

         10.5 Maintenance of Existence and Qualifications. The Company and each
of its Subsidiaries will maintain and preserve its existence and its rights and
franchises in full force and effect and will qualify to do business in all
states or jurisdictions where required by Applicable Law, except where the
failure so to qualify will not cause a Material Adverse Effect.

         10.6 Payment of Trade Liabilities, Taxes, etc. The Company and each of
its Subsidiaries will (a) timely file all required Tax Returns; (b) timely pay
all Taxes, assessments, and other governmental charges or levies imposed upon it
or upon its income, profits or property; (c) timely withhold and pay over to the
proper Governmental Entity all amounts required to be withheld and paid over
under Applicable Laws; (d) pay when due all Liabilities owed by it on ordinary
trade terms to vendors, suppliers and other Persons providing goods and services
used by it in the ordinary course of its business; (e) pay and discharge when
due all other Liabilities now or hereafter owed by it; and (f) maintain
appropriate accruals and reserves for all of the foregoing in accordance with
U.S. GAAP. The Company and each of its Subsidiaries may, however, delay paying
or discharging any of the foregoing so long as it is in good faith contesting
the validity thereof by appropriate proceedings and has set aside on its books
adequate reserves therefor.

         10.7 Insurance. The Company and each of its Subsidiaries will keep or
cause to be kept insured by financially sound and reputable insurers its
properties in such forms and amounts and against such risks as are customary for
Persons engaged in the same or similar business of owning and operating similar
properties.

         10.8 Compliance with Agreements and Law. The Company and each of its
Subsidiaries will perform all material obligations it is required to perform
under the terms of each indenture, mortgage, deed of trust, security agreement,
lease, franchise, agreement, contract or other instrument or obligation to which
it is a party or by which it or any of its properties is bound. The Company and
each of its Subsidiaries will conduct its business and affairs in compliance
with all Applicable Law.

         10.9 Guaranties of Company's Subsidiaries. Each Subsidiary (other than
the Subsidiary Guarantors) of the Company now existing or created, acquired or
coming into existence after the date hereof shall, promptly upon request by
Buyer, execute and deliver to Buyer an absolute and unconditional guaranty of
the timely repayment of the Notes and the due and punctual performance of the
obligations of the Company hereunder, which guaranty shall be satisfactory to
Buyer in form and substance. The Company will cause each of its Subsidiaries to
deliver to Buyer, simultaneously with its delivery of such a guaranty, written
evidence satisfactory to Buyer and its counsel that such Subsidiary has taken
all corporate or partnership action necessary to duly approve and authorize its
execution, delivery and performance of such guaranty and any other documents
which it is required to execute.



                                      -33-

<PAGE>   38





                                   ARTICLE XI

                        NEGATIVE COVENANTS OF THE COMPANY

         To induce Buyer to enter into this Agreement, the Company warrants,
covenants and agrees that until the full and final payment of the Obligations:

         11.1 Indebtedness. Neither the Company nor any Subsidiary thereof will
in any manner owe or be liable for Indebtedness except:

         (a) the Obligations;

         (b) the Senior Credit Facility;

         (c) Indebtedness owed by the Company or any Subsidiary thereof which is
subordinated to the Obligations upon terms and conditions satisfactory to EnCap
LP and ECIC in their sole and absolute discretion;

         (d) purchase money Indebtedness and Indebtedness under leases of the
Company or such Subsidiary as lessee which are capitalized in accordance with
U.S. GAAP, in an aggregate principal amount not to exceed $100,000 at any time,
provided that such purchase money Indebtedness and Indebtedness under capital
leases do not in the aggregate exceed $250,000; and

         (e) Old Latex Payables.

         11.2 Limitation on Liens. Neither the Company nor any Subsidiary
thereof will create, assume or permit to exist any Lien upon any of the
properties or assets which it now owns or hereafter acquires, except the
following ("Permitted Liens"):

         (a) Liens which secure Obligations only;

         (b) Liens which secure the Senior Credit Facility; and

         (c) Statutory Liens for taxes, statutory mechanics' and materialmen's
Liens incurred in the ordinary course of business, and other similar Liens
incurred in the ordinary course of business, provided such Liens do not secure
Indebtedness and secure only Indebtedness which is not delinquent or for which
adequate reserves have been set aside.

         11.3 Limitation on Mergers. Except as expressly provided in this
Section, neither the Company nor any Subsidiary thereof will merge or
consolidate with or into any other business entity. Any Subsidiary of the
Company may, however, be merged into or consolidated with either the Company or
another Subsidiary which is wholly-owned by the Company, so long as the Company
or the Subsidiary wholly-owned by the Company is the surviving business entity.
The



                                      -34-

<PAGE>   39



Company will not issue any securities other than (i) Ordinary Shares, (ii)
deferred shares having nominal value and no voting rights, (iii) the
"Convertible Shares," as defined in the Difco Agreement, or (iv) any options or
warrants giving the holders thereof only the right to acquire such shares. No
Subsidiary of the Company will issue any additional shares of its capital stock
or other securities or any options, warrants or other rights to acquire such
additional shares or other securities except to the Company or to another
Subsidiary. No Subsidiary of the Company which is a partnership will allow any
diminution of the Company's interest (direct or indirect) therein.

         11.4 Limitation on Sales of Property. Neither the Company nor any
Subsidiary thereof will sell, transfer, lease, exchange, alienate or dispose of
any of its assets or properties except:

         (a) equipment which is worthless or obsolete or which is replaced by
equipment of equal suitability and value;

         (b) inventory (including oil and gas sold as produced and seismic data)
which is sold in the ordinary course of business on ordinary trade terms; or

         (c) other property which is sold for fair consideration not in the
aggregate in excess of $500,000 in any Fiscal Year (commencing with Fiscal Year
1999).

         11.5 Limitation on Investments and New Businesses. Neither the Company
nor any Subsidiary thereof will make any expenditure or commitment or incur any
obligation or enter into or engage in any transaction except in the ordinary
course of business (which ordinary course of business includes the acquisition,
directly or indirectly, of oil and gas properties), engage directly or
indirectly in any business or conduct any operations except in connection with
or incidental to its present businesses and operations, make any acquisitions of
or capital contributions to or other investments in any Person, other than
Permitted Investments, or make any significant acquisitions or investments in
any properties other than oil and gas properties.

         11.6 Transactions with Affiliates. Neither the Company nor any of its
Subsidiaries will engage in any material transaction with any of its affiliates
on terms which are less favorable to it than those which would have been
obtainable at the time in arm's-length dealing with Persons other than such
affiliates.

         11.7 Restricted Payments. The Company will not, and will not permit any
of its Subsidiaries to, declare or make, or incur any liability to declare or
make, any Restricted Payment.

         11.8 Material Amendments. The Company will not, and will not permit any
of its Subsidiaries to, consent to any material amendment, supplement or other
modification to any of the terms and provisions of the Burlington Agreement or
the Difco Agreement.




                                      -35-

<PAGE>   40




                                   ARTICLE XII

                             PREPAYMENT OF THE NOTE

         12.1 Optional Prepayment. The Company may, upon not less than thirty
days' notice to the holders of the Notes, from time to time and without premium
or penalty prepay the Notes in cash, in whole or in part, so long as the
aggregate amount of each partial prepayment of principal on the Notes equals at
least $1,000,000 or any higher integral multiple of $1,000,000. Each prepayment
of principal under this Section 12.1 shall be accompanied by all interest then
accrued and unpaid on the principal so prepaid. All principal and interest
prepaid pursuant to this Section 12.1 shall be in addition to, but not in lieu
of, all payments otherwise required to be paid under the Agreement or the
Ancillary Documents at the time of such prepayment.


                                  ARTICLE XIII

                         EVENTS OF DEFAULT AND REMEDIES

         13.1 Events of Default. Each of the following constitutes an "Event of
Default" for purposes of the Notes and this Agreement:

         (a) a default in the payment of principal of any Note when and as the
same shall become due and payable;

         (b) a default in the payment of any interest upon any Note when such
interest becomes due and payable;

         (c) a default in the performance or observation of any covenant,
agreement or condition contained in either Article X or Article XI, which
default is not remedied within 30 days after the earlier of (i) the day on which
the Company first obtains knowledge of such default or (ii) the day on which
written notice thereof is given to the Company by the holder of any Note;

         (d) any "default" or "event of default" occurs under any this Agreement
or any Ancillary Document which defines either such term, and the same is not
remedied within the applicable period of grace (if any) provided in this
Agreement or such Ancillary Document;

         (e) any representation or warranty previously, presently or hereafter
made in writing by or on behalf of the Company or any Subsidiary thereof in
connection with this Agreement or any Ancillary Document shall prove to have
been false or incorrect in any material respect on any date on or as of which
made, which default is not remedied within 30 days after the earlier of (i) the
day on which the Company first obtains knowledge of such default or (ii) the day
on which written notice thereof is given to the Company by the holder of any
Note;




                                      -36-

<PAGE>   41



         (f) the Company or any Subsidiary fails to duly observe, perform or
comply with any agreement with any Person or any term or condition of any loan
document relating to the Senior Credit Facility or any other agreement or
instrument, if such agreement or instrument is materially significant to the
Company or such Subsidiary, and such failure is not remedied within the
applicable period of grace (if any) provided in such agreement or instrument;

         (g) the Company or any Subsidiary thereof fails to pay any portion,
when such portion is due, of any of its Indebtedness in excess of $100,000
(exclusive of the Old Latex Payables), or breaches or defaults in the
performance of any Agreement or instrument by which any such Indebtedness is
issued, evidenced, governed, or secured, and any such failure, breach or default
continues beyond any applicable period of grace provided therefor;

         (h) the Company or any Subsidiary thereof:

                  (i) suffers the entry against it of a judgment, decree or
         order for relief by a tribunal of competent jurisdiction in an
         involuntary proceeding commenced under any applicable bankruptcy,
         insolvency or other similar Applicable Law of any jurisdiction now or
         hereafter in effect, including the United States federal Bankruptcy
         Code or similar foreign law, as from time to time amended, or has any
         such proceeding commenced against it which remains undismissed for a
         period of thirty days; or

                  (ii) commences a voluntary case under any applicable
         bankruptcy, insolvency or similar Applicable Law now or hereafter in
         effect, including the United States federal Bankruptcy Code or similar
         foreign law, as from time to time amended; or applies for or consents
         to the entry of an order for relief in an involuntary case under any
         such Applicable Law; or makes a general assignment for the benefit of
         creditors; or fails generally to pay (or admits in writing its
         inability to pay) its debts as such debts become due; or takes
         corporate or other action to authorize any of the foregoing; or

                  (iii) suffers the appointment of or taking possession by a
         receiver, liquidator, assignee, custodian, trustee, sequestrator or
         similar official of all or a substantial part of its assets in a
         proceeding brought against or initiated by it, and such appointment or
         taking possession is neither made ineffective nor discharged within
         thirty days after the making thereof, or such appointment or taking
         possession is at any time consented to, requested by, or acquiesced to
         by it; or

                  (iv) suffers the entry against it of a final judgment for the
         payment of money in excess of $250,000 (not covered by insurance
         satisfactory to the holders of the Notes in their discretion), unless
         the same is discharged within thirty days after the date of entry
         thereof or an appeal or appropriate proceeding for review thereof is
         taken within such period and a stay of execution pending such appeal is
         obtained; or

                  (v) suffers a writ or warrant of attachment or any similar
         process to be issued by any tribunal against all or any substantial
         part of its assets, and such writ or warrant of


                                      -37-

<PAGE>   42



         attachment or any similar process is not stayed or released within
         thirty days after the entry or levy thereof or after any stay is
         vacated or set aside;

         (i)      Any Change in Control occurs; and

         (j)      Any Material Adverse Effect occurs.

Upon the occurrence of an Event of Default described in subsection (h)(i),
(h)(ii) or (h)(iii) of this section with respect to the Company or a Subsidiary
thereof, all of the Obligations shall thereupon be immediately due and payable,
without demand, presentment, notice of demand or of dishonor and nonpayment,
protest, notice of protest, notice of intention to accelerate, declaration or
notice of acceleration, or any other notice or declaration of any kind, all of
which are hereby expressly waived by the Company and each such Subsidiary. Upon
the occurrence of an Event of Default described in subsection (a) or subsection
(b) of this section, any holder of a Note may during its continuance, by written
notice to the Company declare the Note held by it to be due and payable,
whereupon such Note shall forthwith mature and become due and payable. Upon the
occurrence of any other Event of Default, the Majority of Noteholders may at any
time during its continuance, declare all of the Notes to be due and payable,
whereupon all of the Notes shall forthwith mature and become due and payable.

         13.2 Remedies. If any Default shall occur and be continuing, the holder
of any Note may protect and enforce its rights under the this Agreement and the
Ancillary Documents by any appropriate proceedings, including proceedings for
specific performance of any covenant or agreement contained in this Agreement or
any Ancillary Document, and the holder of any Note may enforce the payment of
any Obligations due it or enforce any other legal or equitable right which it
may have. All rights, remedies and powers conferred upon the holders of the
Notes under this Agreement and the Ancillary Documents shall be deemed
cumulative and not exclusive of any other rights, remedies or powers available
under this Agreement or the Ancillary Documents or at law or in equity.


                                   ARTICLE XIV

                              ADDITIONAL AGREEMENTS

         14.1 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 Buyer to be desirable to enable the Company to issue the Securities to
Buyer and the Placement Fee Shares to an affiliate of Buyer 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.




                                      -38-

<PAGE>   43



         14.2 Access to Information. Between the date hereof and the Closing,
the Company (i) shall give Buyer and its authorized representatives reasonable
access, during regular business hours, 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 Buyer and
its authorized representatives to make such inspections as they may reasonably
require and (iii) shall cause the Company's officers and those of the
Subsidiaries to furnish Buyer and its authorized representatives with such
financial and operating data and other information with respect to the Company
and the Subsidiaries as Buyer may from time to time reasonably request;
provided, however, 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.

         14.3 Listing of Shares. The Company shall use its reasonable best
efforts to cause the Shares and the Placement Fee Shares to be approved for
listing on each securities exchange, automated quotation system or
over-the-counter market upon which securities of the Company of the same class
are listed on the first business day following the Closing Date.

         14.4 Use of Proceeds. The Company will use the Purchase Price to fund
the Acquisitions and for no other purpose, except as provided herein.

         14.5 Board Representation. For up to as long as Buyer holds Ordinary
Shares of the Company that, together with any Ordinary Shares issuable upon
exercise or conversion of any other securities of the Company held by Buyer,
aggregate at least 1% of the issued and outstanding Ordinary Shares, (a) upon
request, the Company will use its reasonable best efforts to cause a designee of
Buyer to be elected as a member of the Board of Directors of the Company, (b) in
the event that any designee of Buyer elected to the Company's Board of Directors
shall cease to serve as a director for any reason, the Company will use its
reasonable best efforts to cause the vacancy resulting therefrom to be filled
with a designee of Buyer and (c) if, despite the Company's reasonable best
efforts, a designee of Buyer is not elected to the Company's Board of Directors,
the Company will use its reasonable best efforts to cause a designee of Buyer
(i) to be permitted to attend meetings of the Company's Board of Directors as a
non-voting observer, (ii) to receive information generally provided to the
Company's Board of Directors, including information with respect to various
corporate developments or transactions, and to have access to the books,
records, and properties of the Company and (iii) to meet with the executive
officers of the Company in order to provide advice and counsel with respect to
the management of the Company.

         14.6 Public Announcements. Except as may be required by Applicable Law,
neither Buyer, on the one hand, nor 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 party (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 party, and in such case the party
proposing to make such a press release or public statement shall consult with
the other party.



                                      -39-

<PAGE>   44



         14.7 Fees and Expenses. The Company shall bear its costs and expenses
in connection with the negotiation, preparation, execution and delivery of this
Agreement and the Ancillary Documents and the other documents and instruments
contemplated hereby and thereby, as well as the consummation of the transactions
contemplated hereby and thereby. The Company shall promptly (and in any event
within 30 days after any invoice or other statement or notice) pay the
reasonable costs and expenses incurred by or on behalf of Buyer, including
attorneys' fees, consultants' fees and engineering fees, travel costs and
miscellaneous expenses in connection with the negotiation, preparation,
execution and delivery of this Agreement and the Ancillary Documents and the
other documents and instruments contemplated hereby and thereby, as well as the
related due diligence and consummation of the transactions contemplated hereby
and thereby.

         14.8 Costs of Enforcement. If any party hereto is required to take
action to enforce its rights under this Agreement, the prevailing party shall be
entitled to its reasonable expenses, including attorneys' fees and expenses, in
connection with any such action.

         14.9 Transfer Taxes. All sales, transfer, filing, recordation,
registration, stamp and similar Taxes and fees arising from or associated with
the issue and sale of the Securities and the Placement Fee Shares as
contemplated hereunder, whether levied on Buyer or the Company, shall be borne
by the Company, and the Company shall file all necessary documentation with
respect to, and make all payments of, such Taxes and fees on a timely basis.

         14.10 Indemnification. The Company shall indemnify, defend and hold
harmless Buyer 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, asserted against, resulting to, imposed
upon, or incurred by Buyer, 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.

                                   ARTICLE XV

                                  MISCELLANEOUS

         15.1     Notices.

         (a) 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



                                      -40-

<PAGE>   45



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):

                  If to EnCap LP or ECIC:

                           Energy Capital Investment Company PLC
                           EnCap Equity 1996 Limited Partnership
                           c/o EnCap Investments L.C.
                           1100 Louisiana, Suite 3150
                           Houston, Texas  77002
                           Attention: Robert L. Zorich
                           Fax No.: 713-659-6130


                  with a copy to:

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

                  If to the Company or any Subsidiary:

                           Alliance Resources PLC
                           4200 East Skelly Drive, Suite 1000
                           Tulsa, Oklahoma  74135
                           Attention:  John A. Keenan
                           Telefax: 918-494-4918

                  with a copy to:

                           Jenkens & Gilchrist, a Professional Corporation
                           1445 Ross Avenue, Suite 3200
                           Dallas, Texas  75202
                           Attention: W. Alan Kailer
                           Telefax: 214-855-4300

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.



                                      -41-

<PAGE>   46



         (b) The Company covenants and agrees that it will give all notices
required or permitted to be given by the Company to EnCap LP or ECIC as a member
or shareholder of the Company in accordance with this Section 15.1 and that to
the extent that this Section 15.1 conflicts with the Organic Documents of the
Company, this Section 15.1 shall control.

         15.2 Waiver and Amendment. No failure or delay (whether by course of
conduct or otherwise) by any party hereto in exercising any right, power or
remedy which such holder may have under the Agreement or any of the Ancillary
Documents shall operate as a waiver thereof or of any other right, power or
remedy, nor shall any single or partial exercise thereof preclude any other or
further exercise thereof or of any other right, power or remedy. No waiver of
any provision of this Agreement or any Ancillary Document and no consent to any
departure therefrom shall ever be effective unless it is in writing and signed
as provided below in this section, and then such waiver or consent shall be
effective only in the specific instances and for the purposes for which given
and to the extent specified in such writing. No waiver, consent, release,
modification or amendment of or supplement to this Agreement or any of the
Ancillary Documents shall be valid or effective against any party hereto unless
the same is in writing and signed by such party.

         15.3 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, regardless of any
investigation made by or on behalf of any party without contractual limitation.
Except as otherwise provided herein or therein, all agreements and/or covenants
of the Company contained in this Agreement or in any of the Ancillary Documents
shall survive the execution and delivery of this Agreement and the Ancillary
Documents and the performance hereof and thereof, and shall further survive
until all of the Obligations are paid in full and all of Buyer's obligations to
the Company are terminated.

         15.4 Entire Agreement. This Agreement, together with the Schedules 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.

         15.5 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 successors and assigns; provided, however, that prior to Closing,
neither party may assign its rights or delegate any of its duties and
obligations under this Agreement or the Ancillary Documents without the prior
written consent of the other; provided, further, that after the Closing, the
Company may not assign its rights or delegate any of its duties and obligations
under this Agreement and the Ancillary Documents without the prior written
consent of the holders of the Notes. Except as expressly provided herein,
nothing in this Agreement, 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.

         15.6 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



                                      -42-

<PAGE>   47



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.

         15.7 GOVERNING LAW.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED
AND ENFORCED IN ACCORDANCE WITH THE LAWS OF ENGLAND AND WALES, WITHOUT REGARD TO
THE PRINCIPLES OF CONFLICTS OF LAWS THEREOF.

         15.8 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.

         15.9 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.

         15.10 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.

         15.11 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.

         15.12 Consent to Jurisdiction. 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 Harris County, 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 shall 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



                                      -43-

<PAGE>   48



brought in such court or any defense of inconvenient forum for the maintenance
of such dispute. Each of the parties hereto agrees 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.

         15.13 Payments. All payments to be made hereunder shall be in lawful
money of the United States of America.



                                      -44-

<PAGE>   49


         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.

                             ENCAP EQUITY 1996 LIMITED PARTNERSHIP

                             By:  ENCAP INVESTMENTS L.C., General Partner


                             By:      /s/ Robert L. Zorich
                                      -----------------------------------
                                      Name:      Robert L. Zorich
                                      Title:     Managing Director


                             ENERGY CAPITAL INVESTMENT COMPANY PLC


                             By:      /s/ Gary R. Petersen
                                      -----------------------------------
                                      Name:      Gary R. Petersen
                                      Title:     Director


                             ALLIANCE RESOURCES PLC


                               By:    /s/ John A. Keenan
                                      -----------------------------------
                                      Name:    John A. Keenan
                                      Title:   Managing Director




<PAGE>   1
                                                                     EXHIBIT 4.2


                             ALLIANCE RESOURCES PLC

                          REGISTRATION RIGHTS AGREEMENT


         This REGISTRATION RIGHTS AGREEMENT dated as of October 30, 1998 (this
"AGREEMENT") by and between ALLIANCE RESOURCES PLC, a public limited company
organized under the laws of England and Wales (the "COMPANY"), ENCAP EQUITY 1996
LIMITED PARTNERSHIP, a Texas limited partnership ("ENCAP LP"), ENERGY CAPITAL
INVESTMENT COMPANY PLC, an English investment company ("ECIC"), and ENCAP
INVESTMENTS L.C., a Texas limited liability company ("ENCAP LC") (with EnCap LP,
ECIC and EnCap LC being herein collectively called the "NEW SHAREHOLDERS");

                                    RECITALS:

         A. The Company and the New Shareholders are parties to that certain
Purchase Agreement dated as of October 27, 1998 (the "PURCHASE AGREEMENT").

         B. The ability of the New Shareholders to freely trade the ordinary
shares, 1p per share, of the Company (the "Ordinary Shares") received by the New
Shareholders pursuant to the Purchase Agreement may be limited by applicable
federal securities laws.

         C. In order to improve the transferability of the Ordinary Shares to be
received by the Stockholder pursuant to the Purchase Agreement, the New
Shareholders have requested the Company to provide to the New Shareholders
limited registration rights with respect to the Ordinary Shares to be received
by the New Shareholders pursuant to the Purchase Agreement, and the Company has
agreed to provide such rights on the terms and subject to the conditions herein.

         D. The execution and delivery of this Agreement by the Company is a
condition to the obligation of the New Shareholders to consummate the
transactions contemplated by the Purchase Agreement.

                                   AGREEMENT:

         NOW, THEREFORE, in consideration of the premises and the mutual
agreements herein set forth and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto,
intending to be legally bound, hereby agree as follows:

                                    ARTICLE I

                               REGISTRATION RIGHTS

         The Company and the New Shareholders covenant and agree as follows:





<PAGE>   2



         SECTION 1. DEFINITIONS AND REFERENCES.

         (a) When used in this Agreement, the following terms shall have the
respective meanings assigned to them in this Section 1 or in the sections,
subsections or other subdivisions referred to below:

         "AGREEMENT" shall mean this Agreement, as hereafter changed, modified
or amended in accordance with the terms hereof.

         "COMMISSION" shall mean the Securities and Exchange Commission (or any
successor body thereto).

         "COMPANY" shall have the meaning assigned to it in the introductory
paragraph hereof.

         "CLOSING DATE" shall have the meaning assigned to in the Purchase
Agreement.

         "DEMAND REGISTRATION" shall have the meaning assigned to it in Section
2(a).

         "DIFCO AGREEMENT" shall mean that certain Registration Rights Agreement
dated as of October 30, 1998, among the Company and F. Fox Benton and certain
members of his family.

         "DIFCO HOLDERS" shall mean those persons identified as Selling
Shareholders in the Difco Agreement.

         "ECIC" shall have the meaning assigned to it in the introductory
paragraph hereof.

         "ENCAP LP" shall have the meaning assigned to it in the introductory
paragraph hereof.

         "ENCAP LC" shall have the meaning assigned to it in the introductory
paragraph hereof.

         "EXCHANGE ACT" shall mean the Securities Exchange Act of 1934, as
amended, and all rules and regulations promulgated under such Act.

         "HOLDER" shall mean any Person that holds Registrable Securities.

         "HOLDER INDEMNIFIED PARTIES" shall have the meaning assigned to it in
Section 9(a).

         "LASALLE AGREEMENT" shall mean that certain Registration Rights
Agreement dated as of October 30, 1998, among the Company and LaSalle.

         "LASALLE" shall mean LaSalle Street Natural Resources Corporation, as a
party to the LaSalle Agreement.

         "NEW SHAREHOLDERS" shall have the meaning assigned to it in the
introductory paragraph hereof.


                                      - 2 -

<PAGE>   3




         "ORDINARY SHARES" shall have the meaning assigned to in Paragraph B of
the Recitals hereto.

         "PERSON" shall mean any individual, corporation, partnership, joint
venture, limited partnership, limited liability company, trust, unincorporated
organization or government or any agency or political subdivision thereof.

         "PIGGYBACK REGISTRATION" shall have the meaning assigned to it in
Section 3.

         "PURCHASE AGREEMENT" shall have the meaning assigned to in Paragraph A
of the Recitals hereto.

         "REGISTRABLE SECURITIES" shall mean (i) the Ordinary Shares received by
the New Shareholders pursuant to the Purchase Agreement and (ii) any securities
issued or issuable with respect to the shares described in clause (i) above by
way of a stock dividend or stock split or in connection with a combination of
shares, recapitalization, merger, consolidation or other reorganization.

         "REGISTRATION EXPENSES" shall mean all expenses incident to the
Company's performance of or compliance with the registration rights granted
hereunder, including (without limitation) all registration and filing fees, fees
and expenses of compliance with securities and blue sky laws, printing and
engraving expenses, messenger, telephone and delivery expenses, and fees and
disbursements of counsel for the Company, all independent certified public
accountants and underwriters (excluding discounts and commissions) and the
reasonable fees and expenses of one counsel to such New Shareholders as a group;
provided, that Registration Expenses shall not include any Selling Expenses.

         "SECURITIES ACT" shall mean the Securities Act of 1933, as amended, and
all rules and regulations under such Act.

         "SELLING EXPENSES" shall mean underwriting discounts or commissions,
any selling commissions and stock transfer taxes attributable to sales of
Registrable Securities.

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



                                      - 3 -

<PAGE>   4



         SECTION 2. DEMAND REGISTRATION RIGHTS.

         (a) At any time after the Closing Date, a Holder may request a
registration by the Company under the Securities Act of all or a part its
Registrable Securities (a "DEMAND REGISTRATION").

         (b) Notwithstanding subsection (a) above or anything else herein to the
contrary, the Company shall not be obligated to effect more than two
registrations pursuant to this Section 2; provided, however, that any
registration requested pursuant to this Section 2 will not be deemed to have
been effected (i) unless it has become effective and remained effective for the
lesser of either the period necessary to complete the sale or disposition of the
Registrable Securities covered by such registration statement or one year, (ii)
if, after it has become effective, such registration is terminated by a stop
order, injunction or other order of the Commission or other governmental agency
or court or (iii) is withdrawn at the request of the Holders after the
registration statement has been filed with the Commission.

         (c) Notwithstanding subsection (a) above or anything else herein to the
contrary, it is hereby agreed that a Demand Registration must cover no less than
50% of the Registrable Securities held by the Holders then outstanding. In the
event a Demand Registration is requested pursuant to this Section 2, the Company
will (i) promptly give notice of the proposed registration to any other New
Shareholder not making the request, if any, and (ii) use its reasonable best
efforts to effect the registration of the Registrable Securities specified in
the request, together with the Registrable Securities of any other New
Shareholder joining in such request as are specified in a written request
received by the Company within 20 days after receipt of the notice referred to
in clause (i) above.

         (d) A registration statement filed under this Section 2 pursuant to the
request of Holders of Registrable Securities may include other securities of the
Company, with respect to which "piggyback" registration rights have been
granted, and may include securities of the Company being sold for the account of
the Company; provided, however, that if the Company shall request inclusion in
any registration pursuant to this Section 2 of the securities being sold for its
own account, or if other persons shall request inclusion in any registration
pursuant to this Section 2, the New Shareholders shall offer to include such
securities in the offering and may condition such offer on their acceptance of
any other reasonable conditions (including, without limitation, if such offering
is underwritten, that such requesting holders agree in writing to enter into an
underwriting agreement with usual and customary terms). Notwithstanding any
other provisions of this Section 2, if the representative of the underwriters
advises the Holders of Registrable Securities in writing that marketing factors
require a limitation on the number of shares to be underwritten, the number of
shares to be included in the underwriting or registration shall be allocated
first to the Holders of Registrable Securities, the Difco Holders and LaSalle
(pro rata, based on the number of Registrable Securities requested by each such
holder to be included therein), second to the Company and thereafter to any
other holders requesting inclusion in the registration on the basis of the
number of shares each other requesting holder requests be included bears to the
total number of shares of all other requesting holders that have been requested
be included in such registration. If a person who has requested inclusion in
such registration as provided above does not agree to the terms of any such
underwriting, such person shall be excluded therefrom by written notice from the
Company,


                                      - 4 -

<PAGE>   5



the underwriter, or the Holders of Registrable Securities. The securities so
excluded shall also be withdrawn from registration.

         SECTION 3. PIGGYBACK REGISTRATION RIGHTS.

         (A) If the Company proposes to register any of its securities under the
Securities Act other than (i) under employee compensation or benefit programs,
(ii) pursuant to an exchange offer or an offering of securities solely to the
existing stockholders or employees of the Company, or (iii) securities to be
issued in connection with an acquisition or a transaction described in Rule
145(a) promulgated under the Securities Act, and the registration form to be
used may be used for the registration of Registrable Securities, the Company
will give prompt written notice (which, in any event, shall be given no less
than 15 days prior to the filing of a registration statement with respect to
such offering) to Holders of Registrable Securities of its intention to effect
such a registration and, upon the written request of a Holder of Registrable
Securities sent within 15 days after the effective date of any such notice, the
Company will use its best efforts to cause all Registrable Securities as to
which any Holder shall have so requested registration to be registered under the
Securities Act, all to the extent necessary to permit the sale in such offering
of the Registrable Securities so registered on behalf of such Holder in the same
manner as the Company (or stockholder other than such Holder, as the case may
be) proposes to offer its securities (a "PIGGYBACK REGISTRATION"). The Company
shall use its best efforts to cause the managing underwriter or underwriters of
a proposed underwritten offering to permit the Registrable Securities requested
by a Holder to be included in the registration for such offering on the same
terms and conditions as any similar securities of the Company included therein;
provided, however, that (A) if, at any time after giving written notice of its
intention to register any of its securities and before the effective date of the
registration statement filed in connection with the registration, the Company
determines for any reason not to register its securities, the Company may, at
its election, give written notice of its determination to the Holders of
Registrable Securities and, thereupon, shall be relieved of its obligation to
register any Registrable Securities in connection with that registration,
without prejudice, however, to the future rights of the Holders of Registrable
Securities under this Section, (B) if the Company determines in its discretion
to delay the registration of its securities, the Company shall be permitted to
delay the registration of any Registrable Securities for the same period as the
delay in registering any other securities, and (C) the Company is not required
to effect any registration for a requesting Holder of Registrable Securities
pursuant to this Section 3 unless it receives reasonable assurances that the
requesting Holder of Registrable Securities will pay any expenses required to be
paid by it as provided in Section 5.

         (b) If a Piggyback Registration is an underwritten registration and the
managing underwriter(s) for the offering advises the Company in writing that in
its opinion the number of shares of Registrable Securities requested or proposed
to be included in the registration exceeds the number that can be sold in the
offering without materially affecting the offering price of the securities
proposed to be included in the offering, then the number of securities to be
offered for the account of any participating Holder(s) shall be reduced pro rata
based upon the number of securities proposed to be sold by the Company, such
Holder(s) and other Persons to the extent necessary to reduce the total number
of securities to be included in such offering to the number of shares
recommended by such managing underwriter; provided, however, that if securities
of the Company


                                      - 5 -

<PAGE>   6



are being offered for the account of other Persons as well as the Company, such
reduction shall first be made from the securities intended to be offered by such
Persons other than the participating Holder(s), the Difco Holders and LaSalle.

         (c) If any Piggyback Registration is an underwritten offering, the
Company will have the sole right to select the managing underwriter(s) thereof.

         (d) The rights of the Holders with respect to Piggyback Registrations
shall be pari passu wit the piggyback registration rights of the Difco Holders
and LaSalle.

         SECTION 4. REGISTRATION PROCEDURES.

         (a) Whenever the Holders of Registrable Securities have requested that
any Registrable Securities be registered pursuant to Section 2 or Section 3, the
Company will as expeditiously as possible:

                  (i) prepare and file with the Commission a registration
         statement on the appropriate form with respect to such Registrable
         Securities, and use its reasonable best efforts to cause such
         registration statement to become effective as soon as reasonably
         practicable after the filing thereof; provided, however, that the
         Company may discontinue any registration of securities that is being
         effected pursuant to Section 3 at any time prior to the effective date
         of the registration statement relating thereto, and provided further,
         that before filing a registration statement or prospectus or any
         amendments or supplements thereto, including documents incorporated by
         reference after the initial filing of any registration statement, as
         soon as practicable, the Company will furnish to any Holder covered by
         such Registration Statement copies of all such documents proposed to be
         filed, which documents will be subject to the review of such Holder;

                  (ii) prepare and file with the Commission such amendments and
         supplements to such registration statement and the prospectus used in
         connection therewith as may be necessary to keep such registration
         statement effective for a period of not less than the period set forth
         in such section or such shorter period which will terminate when
         Registrable Securities covered by such registration statement have been
         sold (but not before the expiration of the applicable prospectus
         delivery period) and comply with the provisions of the Securities Act
         with respect to the disposition of all securities covered by such
         registration statement during such period in accordance with the
         intended methods of disposition by the sellers thereof set forth in
         such registration statement;

                  (iii) notify each seller of Registrable Securities requesting
         registration, promptly after the Company shall receive notice thereof,
         of the time when such registration statement has been filed;

                  (iv) furnish without charge to each seller of Registrable
         Securities such number of copies of such registration statement, each
         amendment and supplement thereto, including financial statements and
         schedules, all documents incorporated therein by reference and all


                                      - 6 -

<PAGE>   7



         exhibits (including those incorporated by reference); the prospectus
         included in such registration statement (including, without limitation,
         each preliminary prospectus); and such other documents as such seller
         may reasonably request in order to facilitate the disposition of the
         Registrable Securities owned by such seller;

                  (v) use its reasonable best efforts to register or qualify
         such Registrable Securities under such other securities or blue sky
         laws of such jurisdictions within the United States as any seller
         reasonably requests; keep each such registration or qualification
         effective during the period such registration statement is required to
         be kept effective; and do any and all other acts and things which may
         be reasonably necessary or advisable to enable such seller to
         consummate the disposition in such jurisdictions of the Registrable
         Securities owned by such seller (provided that the Company will not for
         any such purpose be required to (1) qualify generally to do business as
         a foreign corporation in any jurisdiction where it would not otherwise
         be required to qualify but for the requirements of this subsection; (2)
         subject itself to taxation in any such jurisdiction; (3) consent to
         general service of process in any such jurisdiction; or (4) register or
         qualify Registrable Securities or take any other action under the state
         securities or "Blue Sky" laws of any jurisdiction if, in the reasonable
         good faith judgment of the Board of Directors of the Company, the
         consequences of the registration, qualification or other action would
         be unduly burdensome to the Company);

                  (vi) notify each seller of such Registrable Securities, at any
         time when a prospectus relating thereto is required to be delivered
         under the Securities Act, of the happening of any event which requires
         the making of any change in the prospectus included in such
         registration statement so that such document will not contain an untrue
         statement of a material fact or omit to state any material fact
         required to be stated therein or necessary to make the statements
         therein not misleading, and, at the request of any such seller, the
         Company will prepare a supplement or amendment to such prospectus so
         that such prospectus will not contain an untrue statement of a material
         fact or omit to state any material fact required to be stated therein
         or necessary to make the statements therein not misleading;

                  (vii) use its reasonable best efforts to cause all such
         Registrable Securities to be listed on each securities exchange or
         exchanges, automated quotation system or over-the-counter market upon
         which securities of the Company of the same class are then listed;

                  (viii) enter into such customary agreements (including,
         without limitation, underwriting agreements in customary form,
         substance and scope) and take all such other action as the Holders of a
         majority of the Registrable Securities being sold or the underwriters,
         if any, reasonably request in order to expedite or facilitate the
         disposition of such Registrable Securities;

                  (ix) otherwise use its reasonable best efforts to comply with
         all applicable rules and regulations of the Commission;

                  (x) in the event of the issuance of any stop order suspending
         the effectiveness of a registration statement, or of any order
         suspending or preventing the use of any related


                                      - 7 -

<PAGE>   8



         prospectus or suspending the qualification of any securities included
         in such registration statement for sale in any jurisdiction, the
         Company will use its reasonable best efforts promptly to obtain the
         withdrawal of such order;

                  (x) use its reasonable best efforts to cause such Registrable
         Securities covered by such registration statement to be registered with
         or approved by such other foreign and domestic governmental agencies or
         authorities as may be necessary to enable the sellers thereof to
         consummate the disposition of such Registrable Securities;

                  (xi) use its reasonable best efforts to obtain a comfort
         letter from the Company's public accountants in customary form and
         covering such matters of the type customarily covered by comfort
         letters with respect to offerings of the type being made pursuant to
         the registration statement as the Holders of the Registrable Securities
         reasonably request; and

                  (xii) cooperate with each seller of such Registrable
         Securities to facilitate the timely preparation and delivery of
         certificates representing Registrable Securities to be sold and not
         bearing any restrictive legends.

         (b) Whenever the Holders of Registrable Securities have requested that
any Registrable Securities be registered pursuant to Section 2 or Section 3,
each Holder of Registrable Securities (including Registrable Securities in any
registration statement filed pursuant to this Agreement) will be deemed to have
agreed as follows:

                  (i) upon receipt of any notice from the Company of the
         happening of any event of the kind described in Section 4(a)(vi), the
         Holders of Registrable Securities covered by such registration
         statement will forthwith discontinue disposition of any such
         Registrable Securities until the Holders of Registrable Securities
         receive copies of the supplemented or amended prospectus contemplated
         by Section 4(a)(vi), or until they are advised in writing by the
         Company that the use of the applicable prospectus may be resumed, and
         they have received copies of any additional or supplemental filings
         that are incorporated or deemed to be incorporated by reference in such
         prospectus (it being the agreement of the parties hereto, however, that
         the obligation of the Company with respect to maintaining the subject
         registration statement current and effective shall be extended by a
         period of days equal to the period the Holders of Registrable
         Securities are required by this Section 4(b)(i) to discontinue
         disposition of such Registrable Securities); and

                  (ii) furnish to the Company such information regarding each
         Holder, the Registrable Securities held by such Holder, the intended
         method of disposition thereof and such other information as the Company
         shall reasonably request and as shall be reasonably required in
         connection with the preparation of the applicable registration
         statement and other actions taken by the Company under this Agreement.

         (c) The Company may postpone the filing of any registration statement
required under Section 2 for a reasonable period of time, if (i) the Company has
been advised by legal counsel reasonably acceptable to the Holders of a majority
of the Registrable Securities that such filing


                                      - 8 -

<PAGE>   9



would require the disclosure of a material fact, and the Company determines
reasonably and in good faith that such disclosure would have a material adverse
effect on the Company or (ii) (A) in the good faith judgment of the Board of
Directors of the Company, a required registration under Section 2 would be
seriously detrimental to the Company and the Board of Directors of the Company
concludes, as a result, that it is essential to defer the filing of such
registration statement at such time, and (B) the Company shall furnish to the
Holders of Registrable Securities a certificate signed by the President of the
Company stating that in the good faith judgment of the Board of Directors of the
Company, it would be seriously detrimental to the Company for such registration
statement to be filed in the near future and that it is, therefore, essential to
defer the filing of such registration statement; provided, however, that under
no circumstances shall one or more delays pursuant to this Section 4(c) extend
beyond the earlier to occur of (x) the expiration of a period of ninety (90)
days after receipt of the request of a Holder of Registrable Securities and (y)
that point in time at which the conditions described above no longer exist; and,
provided further, that the Company shall not defer its obligation pursuant to
this Section 4(c) more than once in any twelve-month period.

         SECTION 5. EXPENSES OF REGISTRATION. The Company shall pay all
Registration Expenses in connection with each registration effected pursuant to
Sections 2 and 3 and, in any event, shall pay its internal expenses (including,
without limitation, all salaries and expenses of its officers and employees
performing legal and accounting duties), the expense of any annual audit and the
fees and expenses incurred in connection with the listing of the securities to
be registered on each securities exchange or market on which similar securities
issued by the Company are then listed. All Selling Expenses incurred in
connection with a registration effected pursuant to the terms hereof shall be
borne by the seller or sellers of Registrable Securities.

         SECTION 6. INDEMNIFICATION.

         (a) The Company shall indemnify and hold harmless, with respect to any
registration statement filed by it, to the fullest extent permitted by law, each
Holder of Registrable Securities covered by such registration statement, and
each other Person, if any, who controls such Holder within the meaning of
Section 15 of the Securities Act (collectively, "HOLDER INDEMNIFIED PARTIES")
against all losses, claims, damages, liabilities and expenses, joint or several
to which any such Holder Indemnified Party may become subject under the
Securities Act, the Exchange Act, at common law or otherwise, insofar as such
losses, claims, damages, liabilities or expenses (or actions or proceedings,
whether commenced or threatened, in respect thereof) arise out of or are based
upon (i) any untrue statement or alleged untrue statement of a material fact
contained in any registration statement in which such Registrable Securities
were included as contemplated hereby, or any post-effective amendment thereof,
or any omission or alleged omission to state therein a material fact required to
be stated therein or necessary to make the statements therein not misleading,
(ii) any untrue statement or alleged untrue statement of a material fact
contained in any preliminary, final or summary prospectus, together with the
documents incorporated by reference therein (as amended or supplemented if the
Company shall have filed with the Commission any amendment thereof or supplement
thereto), or any omission or alleged omission to state therein a material fact
required to be stated therein or necessary in order to make the statements
therein, in the light of the circumstances under which they were made, not
misleading, or (iii) any violation by the Company of any federal, state or
common law rule or regulation applicable to the Company and relating to


                                      - 9 -

<PAGE>   10



action of or inaction by the Company in connection with any such registration;
and in each such case, the Company shall reimburse each such Holder Indemnified
Party for any reasonable legal or other expenses incurred by any of them in
connection with investigating or defending any such loss, claim, damage,
liability, expense, action or proceeding; provided, however, that the Company
shall not be liable to any such Holder Indemnified Party in any such case to the
extent that any such loss, claim, damage, liability or expense (or action or
proceeding, whether commenced or threatened, in respect thereof) arises out of
or is based upon any untrue statement or alleged untrue statement or omission or
alleged omission made in such registration statement or amendment thereof or
supplement thereto or in any such preliminary, final or summary prospectus in
reliance upon and in conformity with written information furnished to the
Company by or on behalf of any such Holder Indemnified Party for use in the
preparation thereof; provided further that the Company shall not be liable to
any such Holder Indemnified Party in any such case to the extent that any such
loss, claim, damage, liability or expense (or action or proceeding, whether
commenced or threatened, in respect thereof) arises out of or is based upon any
untrue statement or alleged untrue statement or omission or alleged omission
made in any preliminary prospectus if (A) such holder failed to send or deliver
a copy of the prospectus with or prior to the delivery of written confirmation
of the sale of Registrable Securities and (B) the prospectus would have
completely corrected such untrue statement or omission; provided further that
the Company shall not be liable in any such case to the extent that any such
loss, claim, damage, liability or expense arises out of or is based upon an
untrue statement or alleged untrue statement or omission or alleged omission in
the prospectus, if such untrue statement or alleged untrue statement, omission
or alleged omission is completely corrected in an amendment or supplement to the
prospectus and if, having previously been furnished by or on behalf of the
Company with copies of the prospectus as so amended or supplemented, such holder
thereafter fails to deliver such prospectus as so amended or supplemented, prior
to or concurrently with the sale of a Registrable Security to the person
asserting such loss, claim, damage, liability or expense who purchased such
Registrable Security which is the subject thereof from such holder. Such
indemnity and reimbursement of expenses and other obligations shall remain in
full force and effect regardless of any investigation made by or on behalf of
the Holder Indemnified Parties and shall survive the transfer of such securities
by such Holder Indemnified Parties.

         (b) Each Holder of Registrable Securities participating in any
registration hereunder shall severally (and not jointly or jointly and
severally) indemnify and hold harmless, to the fullest extent permitted by law,
the Company, its directors, each of its officers who has signed the registration
statement and each Person who controls the Company (within the meaning of
Section 15 of the Securities Act) (collectively, "COMPANY INDEMNIFIED PARTIES")
against all losses, claims, damages, liabilities and expenses to which any
Company Indemnified Party may become subject under the Securities Act, the
Exchange Act, at common law or otherwise, and will reimburse each such Company
Indemnified Party for any reasonable legal or other expenses incurred by any of
them in connection with investigating or defending any such loss, claim, damage,
liability, expense, action or proceeding, but only insofar as such losses,
claims, damages, liabilities or expenses (or actions or proceedings, whether
commenced or threatened, in respect thereof) arise out of or are based upon (i)
any untrue statement or alleged untrue statement of a material fact contained in
any registration statement in which such Holder's Registrable Securities were
included or the omission or alleged omission to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading, (ii) any untrue statement or alleged untrue statement of a material


                                     - 10 -

<PAGE>   11



fact contained in any preliminary, final or summary prospectus, together with
the documents incorporated by reference therein (as amended or supplemented if
the Company shall have filed with the Commission any amendment thereof or
supplement thereto), or the omission or alleged omission to state therein a
material fact required to be stated therein or necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading, in each case to the extent (and only to the extent) that
such untrue statement or omission or alleged untrue statement or omission was
made in reliance upon and in conformity with information furnished in writing by
or on behalf of such Holder specifically for use in connection with such
registration, (iii) any violation by the Holder of any federal, state or common
law, rule or regulation applicable to the Holder and relating to action of or
inaction by the Holder in connection with any registration statement and (iv)
with respect to any preliminary prospectus, the fact that the Holder sold
Registrable Securities to a person to whom there was not sent or given, at or
prior to the written confirmation of the sale, a copy of the prospectus
(excluding documents incorporated by reference) or of the prospectus as then
amended or supplemented (excluding documents incorporated by reference) if (a)
the Company has previously furnished copies thereof to the Holder in compliance
with Section 4 and (b) the loss, claim, damage, liability or expense of the
Company Indemnified Party results from an untrue statement or omission of a
material fact contained in the preliminary prospectus which was corrected in the
prospectus (or the prospectus as amended or supplemented). Such indemnity
obligation shall remain in full force and effect regardless of any investigation
made by or on behalf of the Company Indemnified Parties (except as provided
above) and shall survive the transfer of such securities by such Holder.

         (c) Promptly after receipt by an indemnified party under subsection (a)
or (b) of written notice of the commencement of any action, suit, proceeding,
investigation or threat thereof made in writing with respect to which a claim
for indemnification may be made pursuant to this Section 6, such indemnified
party shall, if a claim in respect thereof is to be made against an indemnifying
party, give prompt written notice to the indemnifying party of the threat or
commencement thereof; provided, however, that the failure to so promptly notify
the indemnifying party shall not relieve it from any liability which it may have
to any indemnified party except to the extent that the indemnifying party is
actually prejudiced by such failure to give prompt notice. If any such claim or
action referred to under subsection (a) or (b) is brought against any
indemnified party and it then notifies the indemnifying party of the threat or
commencement thereof, the indemnifying party shall be entitled to participate
therein and, to the extent that it wishes, jointly with any other indemnifying
party similarly notified, to assume the defense thereof with counsel reasonably
satisfactory to such indemnified party. After notice from the indemnifying party
to such indemnified party of its election so to assume the defense of any such
claim or action, the indemnifying party shall not be liable to such indemnified
party under this Section 6 for any legal expenses of counsel or any other
expenses subsequently incurred by such indemnified party in connection with the
defense thereof other than reasonable costs of investigation unless the
indemnifying party has failed to assume the defense of such claim or action or
to employ counsel reasonably satisfactory to such indemnified party. Under no
circumstances will the indemnifying party be obligated to pay the fees and
expenses of more than one law firm for all indemnified parties. The indemnifying
party shall not be required to indemnify the indemnified party with respect to
any amounts paid in settlement of any action, proceeding or investigation
entered into without the written consent of the indemnifying party, which
consent shall not be unreasonably withheld. No indemnifying party shall consent
to the entry of any judgment or


                                     - 11 -

<PAGE>   12



enter into any settlement without the consent of the indemnified party unless
(i) such judgment or settlement does not impose any obligation or liability upon
the indemnified party other than the execution, delivery or approval thereof,
and (ii) such judgment or settlement includes as an unconditional term thereof
the giving by the claimant or plaintiff to such indemnified party of a full
release and discharge from all liability in respect of such claim.

         (d) Indemnification similar to that specified in the preceding
subsections of this Section 6 (with appropriate modifications) shall be given by
the Company and each seller of Registrable Securities with respect to any
required registration or qualification of securities under any state securities
or blue sky laws.

         (e) If the indemnification provided for in this Section 6 is
unavailable to or insufficient to hold harmless an indemnified party under
subsection (a) or (b), then each indemnifying party shall contribute to the
amount paid or payable by such indemnified party as a result of the losses,
claims, damages, liabilities or expenses (or actions or proceedings in respect
thereof) referred to in subsection (a) or (b) in such proportion as is
appropriate to reflect the relative fault of the indemnifying party on the one
hand and the indemnified party on the other in connection with the statements,
omissions, actions or inactions which resulted in such losses, claims, damages,
liabilities or expenses as well as any other relevant equitable considerations.
The relative fault of the indemnifying party and the indemnified party shall be
determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact relates to information supplied by the indemnifying party or the
indemnified party, any action or inaction by any such party, and the parties'
relative intent, knowledge, access to information and opportunity to correct or
prevent such statement, omission, action or inaction. The amount paid or payable
by an indemnified party as a result of the losses, claims, damages, liabilities
or expenses (or actions or proceedings in respect thereof) pursuant to this
subsection (e) shall be deemed to include, without limitation, any reasonable
legal or other expenses incurred by such indemnified party in connection with
investigating or defending any such action or claim (which shall be limited as
provided in subsection (c) if the indemnifying party has assumed the defense of
any such action in accordance with the provisions thereof) which is the subject
of this subsection (e). No person guilty of fraudulent misrepresentation (within
the meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation. Promptly after receipt by an indemnified party under this
subsection (e) of written notice of the commencement of any action, suit,
proceeding, investigation or threat thereof made in writing with respect to
which a claim for contribution may be made against an indemnifying party under
this subsection (e), such indemnified party shall, if a claim for contribution
in respect thereof is to be made against an indemnifying party, give prompt
written notice to the indemnifying party in writing of the commencement thereof
(if the notice specified in subsection (c) has not been given with respect to
such action); provided, however, that the failure to so promptly notify the
indemnifying party shall not relieve it from any obligation to provide
contribution which it may have to any indemnified party under this subsection
(e) except to the extent that the indemnifying party is actually prejudiced by
the failure to give prompt notice.



                                     - 12 -

<PAGE>   13



         The parties hereto agree that it would not be just and equitable if
contribution pursuant to this paragraph were determined by pro rata allocation
or by any other method of allocation which does not take account the equitable
considerations referred to in the immediately preceding paragraph.

         If indemnification is available under this Section 6, the indemnifying
parties shall indemnify each indemnified party to the fullest extent provided in
subsections (a) and (b), without regard to the relative fault of said
indemnifying party or any other equitable consideration provided for in this
subsection. The provisions of this subsection shall be in addition to any other
rights to indemnification or contribution which any indemnified party may have
pursuant to law or contract, shall remain in full force and effect regardless of
any investigation made by or on behalf of any indemnified party, and shall
survive the transfer of securities by any such party.

         (f) In connection with any underwritten offering contemplated by this
Agreement which includes Registrable Securities, the Company and all sellers of
Registrable Securities included in any registration statement shall agree to
customary provisions for indemnification and contribution (consistent with the
other provisions of this Section 6) in respect of losses, claims, damages,
liabilities and expenses of the underwriters of such offering.

         SECTION 7. SELECTION OF UNDERWRITERS. If a registration effected
pursuant to Section 2 is an underwritten offering or a best efforts underwritten
offering, the investment bankers or investment bankers and manager or managers
that will administer the offering shall be selected by the Holders of a majority
of the Registrable Securities to be registered in such registration; provided,
however, that such investment bankers and managers must be reasonably
satisfactory to the Company.

         SECTION 8. RULE 144. The Company covenants to each Holder that, to the
extent that the Company shall be required to do so under the Exchange Act, the
Company shall (a) timely file the reports required to be filed by it under the
Exchange Act or the Securities Act (including, but not limited to, the reports
under Section 13 and 15(d) of the Exchange Act referred to in subparagraph (c)
(1) of Rule 144 adopted by the Commission under the Securities Act) and the
rules and regulations adopted by the Commission thereunder, and (b) take such
further action as any Holder may reasonably request, all to the extent required
from time to time to enable such Holder to sell Registrable Securities without
registration under the Securities Act within the limitations of the exemption
provided by Rule 144 under the Securities Act, as such Rule may be amended from
time to time, or any similar rule or regulation hereafter adopted by the
Commission. Upon the reasonable request of any Holder, the Company shall deliver
to such Holder a written statement as to whether it has complied with such
requirements.

         Section 9. Participation in Underwritten Registrations. In the case of
a registration hereunder, if the Company has determined to enter into an
underwriting agreement in connection therewith, all shares of Registrable
Securities to be included in such registration shall be subject to the
underwriting agreement, which shall be in customary form and contain such terms
as are customarily contained in such agreements, and the Holders may not
participate in any such registration unless the Holder (a) agrees to sell its
securities on the basis provided in any underwriting arrangements and (b)
completes and executes all questionnaires, power of attorney,


                                     - 13 -

<PAGE>   14



indemnities, underwriting agreements and other documents reasonably required
under the terms of the underwriting arrangements.

         Section 10. Rights to Withdraw From Registration. If, as a result of
the proration provisions of Section 3(b) a Holder is not entitled to include all
Registrable Securities in a registration that the Holder has requested to be
included, the Holder may elect to withdraw its request to include Registrable
Securities in the registration (a "Withdrawal Election"); provided, however,
that a Withdrawal Election shall be irrevocable and, after making a Withdrawal
Election, the Holder shall no longer have any right to include Registrable
Securities in the registration as to which the Withdrawal Election was made.

         SECTION 11. EXISTING REGISTRATION RIGHTS. The Company and each of the
Initial Shareholders represent and warrant to, and covenant with, the New
Shareholders as follows:

         (a) As of the date hereof, the Company has not entered into any
agreement, written or oral, granting or otherwise affording to a third party
registration rights with respect to any securities held by such third party in
the Company, except for the Difco Agreement and the LaSalle Agreement.

         SECTION 12. MISCELLANEOUS.

         (a) From and after the date of this Agreement, the Company will not
enter into any agreement with respect to its securities which is inconsistent
with or violates the rights granted to the Holders of Registrable Securities in
this Agreement.

         (b) Each Holder of Registrable Securities (including Registrable
Securities in any registration statement filed pursuant to this Agreement)
agrees as follows:

                  (i) if any Registrable Securities are being registered in any
         registration pursuant to this Agreement, the Holder thereof will comply
         with all anti-stabilization, manipulation and similar provisions of
         Section 10 of the Exchange Act, as amended, and any rules promulgated
         thereunder by the Commission and, at the request of the Company, will
         execute and deliver to the Company and to any underwriter participating
         in such offering, an appropriate agreement to such effect; and

                  (ii) at the end of any period during which the Company is
         obligated to keep a registration statement current and effective as
         described herein, the Holders of Registrable Securities included in the
         registration statement shall discontinue sales thereof pursuant to such
         registration statement.

         (c) In order to facilitate the possibility of future public offerings
of Ordinary Shares, the Holders (and any subsequent Holder) agree that the
Registrable Securities will not be resold during a period commencing on the
filing by the Company of a registration statement under the Securities Act for
an underwritten public offering for cash by the Company of its Ordinary Shares
or securities convertible into or exercisable or exchangeable for its Ordinary
Shares and continuing until the


                                     - 14 -

<PAGE>   15



earlier of the abandonment of the proposed public offering or 120 days following
the date of the last closing in the public offering without the consent of the
underwriters of such offering, except to the extent such shares are included in
such registration. Holders of such Registrable Securities also agree that they
will cooperate with the Company in providing reasonable written assurances
respecting the foregoing to the underwriter of any such public offering. Holders
agree that during the above restricted period they will not directly or
indirectly sell, offer to sell, contract to sell (including without limitation
any short sale), grant an option to purchase or otherwise transfer or dispose of
(other than to donees who agree to be similarly bound) shares of Registrable
Securities at any time during such period except securities included in such
registration. In order to enforce the foregoing covenant, the Company may impose
stop-order instructions with respect to such shares of Registrable Securities
held by each Holder, which shall be binding upon any assignee or successor of
such Holder (and the shares or securities of every other person subject to the
foregoing restriction), until the end of the restricted period.

         (d) All questions concerning the construction, validity and
interpretation of this Agreement shall be governed by the internal law, and not
the law of conflicts, of the State of Texas.

         (e) All covenants and agreements in this Agreement by or on behalf of
any of the parties hereto will bind and inure to the benefit of the respective
successors and assigns of the parties hereto. In addition, the rights and
obligations under this Agreement shall automatically be transferred to and
binding on any transferee or assignee of the Registrable Securities; provided,
that (i) the Company is, within a reasonable time after such transfer, furnished
with written notice of the name and address of such transferee or assignee and
the Registrable Securities with respect to which such registration rights are
being transferred or assigned, (ii) such transferee or assignee agrees in
writing to be bound by and subject to the terms and conditions of this
Agreement, (iii) the transfer and assignment of the subject Registrable
Securities is in compliance with (A) the Purchase Agreement and (B) the
Securities Act and applicable state securities laws or an exemption from the
registration requirements of the Securities Act and applicable state securities
laws, (iv) such assignment of rights and obligations under this Agreement shall
be effective only if immediately following such transfer the further disposition
of such Registrable Securities by the transferee or assignee is restricted under
the Securities Act and (v) the transferee acquires at least 10% of the
Registrable Securities originally purchased by the New Shareholders from the
Company.

         (f) This Agreement is intended by the parties as a final expression of
their agreement and intended to be a complete and exclusive statement of the
agreement and understanding of the parties hereto in respect of the subject
matter herein contained. There are no restrictions, promises, warranties or
undertakings, other than those set forth or referred to herein, with respect to
the registration rights granted by the Company to the Holders of the Registrable
Securities. This Agreement supersedes all prior agreements and understandings
between the parties with respect to such subject matter.

         (g) All notices, demands or other communications to be given or
delivered under or by reason of the provisions of this Agreement shall be in
writing and shall be deemed to have been given when delivered personally or sent
by reputable express courier service (charges prepaid), or mailed to the
recipient by certified or registered mail, return receipt requested and postage
prepaid,


                                     - 15 -

<PAGE>   16



or sent by telefax, to the parties at the following address (or to such other
address or to the attention of such other person as the recipient party has
specified by prior like notice to the sending party):

         If to the Company:

                           Alliance Resources PLC
                           4200 East Skelly Drive, Suite 1000
                           Tulsa, Oklahoma  74135
                           Attention:  John A. Keenan
                           Fax No.: 918-494-4918

         If to either EnCap LP
         or ECIC:

                           Energy Capital Investment Company PLC
                           EnCap Equity 1996 Limited Partnership
                           c/o EnCap Investments L.C.
                           1100 Louisiana, Suite 3150
                           Houston, Texas  77002
                           Attention: Robert L. Zorich
                           Fax No.: 713-659-6130

         If to EnCap LC:

                           EnCap Investments L.C.
                           1100 Louisiana, Suite 3150
                           Houston, Texas  77002
                           Attention: Robert L. Zorich
                           Fax No.: 713-659-6130

         (h) 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.

         (i) 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.

         (j) Each Holder of Registrable Securities, in addition to being
entitled to exercise all rights granted by law, including recovery of damages,
will be entitled to specific performance of its rights under this Agreement.
Each party agrees that monetary damages would not be adequate


                                     - 16 -

<PAGE>   17



compensation for any loss incurred by reason of breach by it of the provisions
of this Agreement and hereby agrees to waive (to the extent permitted by law)
the defense in any action for specific performance that a remedy of law would be
adequate.

         (k) In any action or proceeding brought to enforce any provision of
this Agreement, or where any provision hereof is validly asserted as a defense,
the successful party shall be entitled to recover reasonable attorneys' fees in
addition to any other available remedy.

         (l) The Company agrees to remove any legends on certificates
representing Registrable Securities describing transfer restrictions applicable
to such securities upon the sale of such securities (i) pursuant to an effective
Registration Statement under the Securities Act or (ii) in accordance with the
provisions of Rule 144 under the Securities Act.





                     [REMAINDER OF PAGE INTENTIONALLY BLANK]


                                     - 17 -

<PAGE>   18


         IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed as of the date first above written.

                                 ENCAP EQUITY 1996 LIMITED PARTNERSHIP

                                 By:  ENCAP INVESTMENTS L.C., General Partner


                                 By:      /s/ Robert L. Zorich
                                    -------------------------------------------
                                          Name:      Robert L. Zorich
                                          Title:     Managing Director


                                 ENERGY CAPITAL INVESTMENT COMPANY PLC


                                 By:      /s/ Gary R. Petersen
                                    -------------------------------------------
                                          Name:      Gary R. Petersen
                                          Title:     Director


                                 ENCAP INVESTMENTS L.C.


                                 By:      /s/ Robert L. Zorich
                                    -------------------------------------------
                                          Name:      Robert L. Zorich
                                          Title:     Managing Director


                                 ALLIANCE RESOURCES PLC


                                   By:      /s/ Francis M. Munchinski
                                    -------------------------------------------
                                            Name:    Francis M. Munchinski
                                            Title:   Authorized Signatory






<PAGE>   1
                                                                     EXHIBIT 4.3

                             DATED 4th February 1994




                    (1) ENERGY CAPITAL INVESTMENT COMPANY PLC

                                     - and -

                           (2) ENCAP INVESTMENTS L.C.












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

                          INVESTMENT ADVISORY AGREEMENT

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













                                  Hobson Audley
                                7 Pilgrim Street
                                 London EC4V 6DR

                                  ARG/LJI/2487



<PAGE>   2



                          INVESTMENT ADVISORY AGREEMENT



AN AGREEMENT made the 4th day of February, One thousand nine hundred and ninety
four.


B E T W E E N


(1)      ENERGY CAPITAL INVESTMENT COMPANY PLC (registered in England No.
         2867571) whose registered office is at 99 Charterhouse Street, London
         EC1M 6AB ("the Company"),

(2)      ENCAP INVESTMENTS L.C., a Texas limited liability company whose
         principal place of business is at 1100 Louisiana Street, Suite 3150,
         Houston, Texas 77002 USA ("EnCap").

WHEREAS:

(A)      The Company is desirous of appointing EnCap (subject as hereinafter
         provided) to advise the Company in relation to the management and
         investment and re-investment of the Company's Investments.

(B)      EnCap is engaged in business offering investment management and
         advisory services in the USA in relation to the oil and gas industry
         and has considerable skill, knowledge and experience in that field.

NOW IT IS HEREBY AGREED as follows:

1.       INTERPRETATION

         1.1      In this Agreement the following words and expressions shall
                  where not inconsistent with the context have the following
                  meanings respectively:


                                      - 1 -

<PAGE>   3



                  "Affiliate" with regard to another person shall mean any
                  person directly or indirectly controlling, controlled by or
                  under common control with, such other person; "Control" means
                  the possession, directly or indirectly, of the power to direct
                  or cause the direction of the management and policies of a
                  person whether through the ownership of voting securities, by
                  contract or otherwise;

                  "Appointee(s)" means any person or persons to whom EnCap may
                  have delegated any of its functions hereunder;

                  "Articles" means the Articles of Association of the Company as
                  amended from time to time and any reference herein to an
                  Article shall be taken to refer to the Articles unless
                  otherwise specified;

                  "Directors" means the Board of Directors of the Company from
                  time to time including any duly appointed committee thereof;

                  "Independent Directors" means the Directors other than those
                  connected within the meaning of Section 346 of the Companies
                  Act 1985 with EnCap;

                  "the Investments" means the assets and rights from time to
                  time of the Company acquired pursuant to this Agreement and
                  held in accordance with the Memorandum of Association and
                  Articles of the Company;

                  "Investment Policy" means the investment policy of the Company
                  (as reviewed and amended by the Directors from time to time)
                  as initially stated in the Particulars and repeated in Part A
                  of Schedule One;

                  "Investment Restrictions" means the investment restrictions
                  (as reviewed and amended by the Directors from time to time or
                  as amended by statute or rules or


                                      - 2 -

<PAGE>   4



                  regulations thereunder) as initially stated in the Particulars
                  and repeated in Part B of Schedule One;

                  "the Particulars" means the Listing Particulars of the Company
                  proposed to be dated 4th February 1994;

                  "the Partnership" means the US Limited Partnership to be
                  constituted between EnCap, Lincoln National Life Insurance
                  Company, Internationale Nederlanden (U.S.) Capital Corporation
                  and others to co-invest with the Company as is
                  referred to in the Particulars;

                  "the Placing" means the placing of Ordinary Shares and
                  Warrants described in the Particulars;

                  "the Placing Agreement" means the Agreement of even date
                  herewith made between the Company (1), Greig Middleton & Co.
                  Limited (2) Henderson Crosthwaite Institutional Brokers
                  Limited (3), and Rauscher Pierce & Clark Limited (4) described
                  in the Particulars in paragraph 7(b) of Part IV thereof under
                  the heading "General Information";

                  "Schedules" mean the Schedules annexed hereto which form part
                  of this Agreement;

                  "the Secretary" means Aberdeen Trust PLC or the Secretary of
                  the Company for the time being;

                  "subsidiary" has the meaning ascribed thereto in Section 144
                  of the Companies Act 1989;



                                      - 3 -

<PAGE>   5



                  "The London Stock Exchange" means the International Stock
                  Exchange of the United Kingdom and Republic of Ireland
                  Limited;

                  Any reference to EnCap includes a reference to its duly
                  authorised agents or delegates.

         1.2      Words and expressions contained in this Agreement (but not
                  defined herein) shall bear the same meanings as in the
                  Articles PROVIDED THAT any alteration or amendment of the
                  Articles shall not be effective for the purpose of this
                  Agreement unless any affected party (to the extent that its
                  rights or duties hereunder are affected by such alteration or
                  amendment) shall by endorsement hereon or otherwise in writing
                  have assented thereto.

         1.3      The headings to the Clauses of this Agreement are for
                  convenience only and shall not affect the construction or
                  interpretation thereof.

2.       CONDITIONAL AGREEMENT

         This Agreement shall be conditional in all respects upon the Placing
         Agreement becoming unconditional in all respects.

3.       APPOINTMENT AND FUNCTIONS OF ENCAP

         3.1      The Company HEREBY APPOINTS EnCap, subject to and in
                  accordance with the directions of the Directors, and in
                  accordance with the Investment Policy and Investment
                  Restrictions, as advisors and managers in respect of the
                  investment and re-investment of the Investments on the terms
                  contained herein and EnCap hereby accepts such appointment and
                  agrees to assume the obligations set forth herein.



                                      - 4 -

<PAGE>   6



         3.2      Without prejudice to the generality of Clause 3.1 above, the
                  duties to be performed by EnCap on behalf of the Company in
                  accordance with the Investment Policy and the Investment
                  Restrictions shall include the following:

                  3.2.1    EnCap shall, as and when requested by the Board, use
                           all reasonable endeavours to identify Investments,
                           conforming with the Investment Policy, for
                           recommendation to the Board. EnCap shall furnish to
                           the Directors in relation to any proposed Investment
                           all such information as the Directors shall
                           reasonably require or which is in EnCap's possession,
                           to enable the Directors to consider the proposed
                           Investment.

                  3.2.2    Following the identification by EnCap of a Proposed
                           Investment, EnCap shall conduct such further
                           investigations as the Directors shall reasonably
                           request and when reasonably requested by the
                           Directors, EnCap shall report and advise in relation
                           thereto.

                  3.2.3    As and when so requested by the Directors, EnCap
                           shall commission an independent engineering firm
                           approved by the Directors to furnish to the Directors
                           and EnCap a report in relation to the proposed
                           Investment. The terms of reference for such report
                           shall be as agreed between the Directors and EnCap.

                  3.2.4    EnCap shall undertake all negotiations with third
                           parties in relation to a proposed Investment on
                           behalf of the Company and shall be responsible for
                           procuring, in accordance with all applicable legal
                           requirements and best practice, the preparation and
                           execution of all deeds, documents of title and
                           agreements in relation to Investments and the
                           perfecting of the Company's title thereto.



                                      - 5 -

<PAGE>   7



                  3.2.5    EnCap shall be responsible for advising and
                           instructing the Company's Corporate Managers for the
                           time being and Secretary on administrative
                           requirements in order to implement the making of
                           Investments.

         3.3      Subject to the terms of this Agreement, to such directions as
                  may from time to time be given by the Directors and to the
                  overall policy and supervision of the Directors, EnCap is
                  authorised to act for the Company or any subsidiary and on
                  behalf of the Company and or any subsidiary either itself or
                  wholly or in part through its authorised agents or delegates
                  in the same manner and with the same force and effect as the
                  Company or any subsidiary might or could do and to exercise
                  the functions, duties, powers and discretions exercisable by
                  the Directors under the Articles (including, without prejudice
                  to the generality of the foregoing, the functions duties
                  powers and discretions specifically mentioned in Clause 3.2
                  above) and to manage the investment and re-investment of the
                  Investments.

         3.4      EnCap shall keep or cause to be kept on behalf of the Company
                  such books, records and statements to give a complete record
                  of all transactions carried out by EnCap on behalf of the
                  Company (or any subsidiary) in relation to the investment and
                  re-investment of the Investments and such other books, records
                  and statements as may be required to give a complete record of
                  all other transactions carried out by EnCap on behalf of the
                  Company (or any subsidiary) and shall permit the Company and
                  its employees and agents and the auditors for the time being
                  of the Company to inspect such books, records and statements
                  at all reasonable times.

         3.5      EnCap hereby warrants that it holds all licences, permissions,
                  authorisations and consents necessary to enable it to carry
                  out its duties as advisors and managers in the ordinary course
                  of business. EnCap undertakes to use its best endeavours to
                  continue to hold all such licences, permissions,
                  authorisations and consents necessary for its duties hereunder
                  and to notify the Company immediately should


                                      - 6 -

<PAGE>   8



                  any such licence, permission, authorisation or consent cease
                  to be in full force and effect.

         3.6      EnCap shall observe and comply with the Memorandum of
                  Association and Articles of the Company and with any
                  alterations thereto notified to EnCap by the Company and with
                  the applicable provisions of the Particulars and the
                  Investment Restrictions and all obligations deriving from
                  listing particulars of the Company from time to time issued
                  and all resolutions of the Directors of which it has notice
                  and other lawful orders and directions given to it from time
                  to time by the Directors and all activities engaged in by
                  EnCap hereunder shall at all times be subject to the control
                  of and review by the Directors and EnCap shall and shall
                  procure that any person, firm or company to whom it delegates
                  any of its functions hereunder shall give effect to all such
                  decisions.

         3.7      EnCap shall procure that all Investments shall be registered
                  in the name of the Company or any subsidiary or the nominees
                  of the Company.

         3.8      EnCap undertakes with the Company that it will procure that,
                  during the continuance of this Agreement, the Company shall be
                  afforded the opportunity (as is provided in the Particulars)
                  to invest in all investments made by, and investment
                  arrangements entered into, by the Partnership in all respects
                  upon the same terms and conditions as are afforded to the
                  Partnership.

4.       INFORMATION OBLIGATIONS OF ENCAP

         4.1      EnCap shall keep the Company informed of all material matters
                  relating to the Investments of the Company, to such extent and
                  in such form and at such times as the Company shall reasonably
                  require.

         4.2      Without limiting the generality of Clause 4.1 EnCap shall:


                                      - 7 -

<PAGE>   9



                  4.2.1    When reasonably requested by the Board deliver to the
                           Company in respect of each calendar month a summary
                           report, in such form as the Company shall reasonably
                           require, relating to the Company's Investments and
                           any proposed Investment then under consideration;

                  4.2.2    Within 30 days of the end of each calendar quarter,
                           deliver to the Company a report, in such form as the
                           Company shall reasonably require, comprising detailed
                           financial information in relation to each Investment
                           of the Company and including detailed cost and
                           revenue allocations;

                  4.2.3    Within 90 days of the end of each financial year of
                           the Company, deliver to the Company a report, in such
                           form as the Company shall reasonably require,
                           comprising financial and taxation statements in
                           relation to the Company's Investments as at the end
                           of the financial year then ended prepared by a firm
                           of accountants previously approved by the Company and
                           reserve reports prepared in relation to the Company's
                           Investments as at the end of the financial year then
                           ended, prepared by such independent petroleum
                           engineer previously approved by the Company.

5.       REMUNERATION

         5.1      The Company shall during the continuance of this Agreement pay
                  to EnCap by way of remuneration for the provision of services
                  and advice pursuant to this Agreement an annual fee, payable
                  by equal quarterly instalments in arrears on 31st March, 30th
                  June, 30th September and 31st December in each year,
                  calculated at the rate of 1% of the Company's NAV as at 31st
                  December preceding the year in which the payments are due to
                  be made. For the purposes of this clause "NAV" means the
                  amount in US dollars of the aggregate of:

                  5.1.1    All cash at bank and in hand of the Company; and


                                      - 8 -

<PAGE>   10



                  5.1.2    All amounts owing to the Company, whether or not due
                           for payment or repayment at the relevant time,
                           excluding (i) any amount falling within sub-clause
                           5.1.4 and (ii) any amount loaned by the Company and
                           secured on any asset or interest in respect of oil
                           and gas to the extent that the present worth of
                           future revenue, discounted at a rate of 10 per cent
                           per annum, of the proved reserves (as shown in the
                           relevant independent petroleum engineer's reserve
                           report prepared as at the relevant date or the
                           closest practicable date thereto) securing any such
                           loan does not provide a coverage ratio in respect of
                           the amounts advanced by the Company and all accrued
                           interest of at least 1:1; and

                  5.1.3    The present worth of the future net revenue,
                           discounted at 15 per cent per annum, of the proved
                           reserves attributable to any direct equity interests
                           owned by the Company in oil and gas properties (as
                           shown in the relevant engineer's reserve report
                           prepared as at the relevant date or the closest
                           practicable date thereto); and

                  5.1.4    In the case of any Investment comprising debt or
                           equity securities (including without limitation
                           shares, options, warrants and bonds) that are traded
                           on a recognised investment exchange, the aggregate of
                           the market value to the Company of such securities as
                           at the relevant date (it being agreed that in the
                           event that an Investment falls within this sub-clause
                           5.1.4 and any of sub-clause 5.1.2, 5.1.3 and 5.1.5,
                           the provisions of this sub-clause 5.1.4 shall apply
                           to the exclusion of the other sub-clauses for the
                           purposes of calculating NAV); and

                  5.1.5    In the case of any Investment comprising any equity
                           securities in any entity (whether corporate or not)
                           not falling within sub-clause 5.1.4, the value of
                           such equity securities to the Company calculated on
                           the basis of that proportion of such entity's NAV
                           attributable to the Company (the


                                      - 9 -

<PAGE>   11



                           NAV of such entity being calculated on the same
                           basis, mutatis mutandis, as is set out in this
                           Clause);

                  less an amount equal to all indebtedness of the Company at the
                  relevant time, whether or not then due for payment or
                  repayment;

                  PROVIDING that for the purposes of this clause the NAV of the
                  Company as at 31st December 1993 shall be deemed to be equal
                  to the net proceeds of the Placing having deducted all
                  expenses thereof.

                  PROVIDING further that the NAV shall be determined by the
                  Independent Directors using the foregoing principles and
                  reserve reports prepared by an independent petroleum
                  engineering firm, which shall use the same assumptions for
                  future oil and gas prices as those generally utilised by major
                  oil and gas lending institutions in the USA at the time the
                  valuation is made;

         5.2      The fees payable hereunder are inclusive of all applicable
                  value added tax and any other sales or services taxes
                  whatsoever payable from time to time and whether principally
                  by the Company or EnCap.

         5.3      The fees payable pursuant to Clause 5.1 shall be deemed to
                  accrue on a daily basis.

         5.4      By way of further remuneration for the provision of services
                  and advice pursuant to this Agreement, and provided that this
                  Agreement shall not previously have been terminated by EnCap
                  pursuant to Clause 13.1 or by the Company pursuant to Clause
                  13.2, the Company shall pay to EnCap as soon as such amount
                  shall have been determined following 31st December 2001 or the
                  date a special resolution is passed pursuant to Section 84
                  Insolvency Act 1986 for the voluntary winding up of the
                  Company, whichever is the earlier, an amount equal to 25%. of
                  the


                                     - 10 -

<PAGE>   12



                  Company's Adjusted NAV as at 31st December 2001 or the date of
                  the passing of the special resolution for the winding-up of
                  the Company, as appropriate.

         5.5      Adjusted NAV means, at the relevant date:

                  (a)      NAV;

                  (b)      less an amount equal to the aggregate of the
                           Company's share capital and the amount standing to
                           the credit of the Company's share premium account as
                           converted (where appropriate) into US dollars at the
                           actual exchange rates at which such subscriptions
                           were converted into US dollars; and

                  (c)      (i)      less the amount (if any) by which an 8%
                                    annual rate of return on the aggregate of
                                    the Company's share capital and the amount
                                    standing to the credit of the Company's
                                    share premium account, calculated from the
                                    relevant dates of payment to the Company of
                                    such share capital and share premium,
                                    exceeds the aggregate of the dividends paid
                                    by the Company since its incorporation,
                                    inclusive of any tax credit in respect of
                                    such dividends; or

                           (ii)     aggregating therewith the amount (if any) by
                                    which the aggregate of the dividends paid by
                                    the Company since its incorporation,
                                    inclusive of any tax credit in respect of
                                    such dividends, exceeds an 8% annual rate of
                                    return on the aggregate of the amount
                                    standing to the credit of the Company's
                                    share capital and share premium account
                                    calculated from the relevant dates of
                                    payment of such share capital and share
                                    premium.



                                     - 11 -

<PAGE>   13



         5.6      In the event of any dispute with regard to the determination
                  of any fee payable pursuant to this Clause, such dispute shall
                  be referred for determination to the Company's auditors, or
                  such other firm of Chartered Accountants as the Company and
                  EnCap shall agree. In making a determination such accountants
                  shall act as experts and not as arbitrators and they shall be
                  entitled to call for and inspect such documents as they shall
                  deem appropriate. The determination of such accountants shall
                  be final and binding on the Company and EnCap.

6.       ADDITIONAL SERVICES

         If EnCap, being willing and having been called upon so to do, shall
         render or perform extra or special services of any kind to the Company,
         EnCap shall be entitled to receive such additional reasonable fees
         therefor as the Directors in consultation with EnCap may from time to
         time agree. If EnCap offers additional services to the Company, EnCap
         may determine the level of fees or charges as it deems fit and proper
         for the payment of such services and offer to provide such services to
         the Company and the Company may accept or reject an offer of such
         services as it so determines.

7.       EXPENSES

         7.1      Unless otherwise agreed between the Company and EnCap, the
                  Company shall pay or procure payment of the following
                  expenses:-

                  7.1.1    All accountancy fees, petroleum consultants' fees and
                           legal expenses incurred by the Company or EnCap or
                           the secretary in connection with the identifying,
                           negotiating and making of Investments and all other
                           professional and other charges in respect of services
                           rendered to the Company or EnCap in connection with
                           the matters aforesaid;



                                     - 12 -

<PAGE>   14



                  7.1.2    Any stamp and other duties, taxes, Governmental
                           charges, brokerage, transfer fees, registration fees
                           and other charges payable in respect of the
                           acquisition or realisation of any Investment,
                           including charges for the transfer of funds or
                           instructions for delivery of securities by telex,
                           cable, telephone or otherwise;

                  7.1.3    All taxes and corporate fees payable by the Company
                           to the Government or other authority or to any agency
                           of the Government or authority in the United States
                           of America or elsewhere;

                  7.1.4    All charges specifically incurred by EnCap on behalf
                           of the Company.

                  EnCap will advise the Company prior to incurring any third
                  party fees or any third party expenses for the account of the
                  Company if EnCap believes that such fees or expenses will
                  exceed US$7,500.

         7.2      EnCap shall provide at its own expense:-

                  7.2.1    Such staff as may be necessary for the due
                           performance of its duties hereunder;

                  7.2.2    Such office and other accommodation and office
                           equipment as may be necessary for the due performance
                           of its duties hereunder.

         7.3      It is hereby expressly declared that the persons employed by
                  EnCap to perform its obligations under this Agreement shall be
                  the employees, agents or subcontractors of EnCap and not of
                  the Company and accordingly shall not be regarded or treated
                  as employees of the Company.



                                     - 13 -

<PAGE>   15



         7.4      Any arrangement or other fee (on the appropriate proportion
                  thereof) paid to EnCap in respect of any Investment shall be
                  paid or reimbursed by EnCap to the Company.

8.       POWER OF DELEGATION

         EnCap may with the consent of the Company delegate the whole or any
         part of its powers, duties, discretions and functions hereunder to any
         person, firm or company.

9.       NON-EXCLUSIVITY

         9.1      The services of EnCap hereunder are not to be deemed exclusive
                  to the Company and EnCap or any Affiliate thereof shall be
                  free to render similar services to others on such terms as
                  EnCap or such Affiliate may arrange so long as its services
                  under this Agreement are not thereby impaired, and to retain
                  for its own use and benefit fees or other moneys payable
                  thereby, and EnCap shall not be deemed to be affected with
                  notice of or to be under any duty to disclose to the Company
                  any fact or thing which may come to the notice of it or any
                  servant or agent of it in the course of EnCap rendering
                  similar services to others or in the course of its business in
                  any other capacity or in any manner whatsoever otherwise than
                  in the course of carrying out its duties under this Agreement.

         9.2      EnCap shall procure that the Company shall have first priority
                  (together with the Partnership) to make Investments identified
                  by EnCap complying with the Investment Policy and Investment
                  Restrictions provided that in the absence of bad faith EnCap
                  shall not be liable to the Company in respect of it having
                  arranged any Investment made by any person (including EnCap's
                  affiliates) which investment the Directors may determine as
                  having complied with the Investment Policy and Investment
                  Restrictions.



                                     - 14 -

<PAGE>   16



10.      EXERCISE OF RIGHTS ATTACHED TO INVESTMENTS

         Subject as otherwise provided in this Agreement, any rights conferred
         by Investments of the Company shall be exercised in such manner as the
         Directors may determine and EnCap shall (in so far as it is able)
         procure the exercise of such rights in accordance therewith.

11.      CUSTODY

         EnCap shall be responsible to the Company for procuring the safe
         custody of all documents of title, deeds, certificates and agreements
         in respect of the Investments of the Company unless otherwise notified
         by the Company in writing.

12.      LIABILITY AND INDEMNITY

         12.1     EnCap shall not be liable to the Company or any subsidiary for
                  any action taken or not taken by them or for any action taken
                  or not taken by any other person with respect to the Company
                  or any subsidiary or in respect of the Investments provided
                  that EnCap shall remain liable for any loss arising from the
                  fraud, negligence, wilful default, bad faith or misconduct of
                  EnCap, its employees and/or any of their agents.

         12.2     The Company hereby indemnifies EnCap and each officer,
                  employee or agent of EnCap against any losses, claims, damages
                  or liabilities (including legal or other expenses reasonably
                  incurred) to which such person may become subject by reason of
                  its being an officer, employee or agent of EnCap (but only to
                  the extent and with respect to services performed by EnCap or
                  officers, employees or agents of EnCap for or on behalf of the
                  Company) or representing the Company or any subsidiary on the
                  Board of Directors of any company in which the Company or any
                  subsidiary has invested or otherwise in providing services
                  under this


                                     - 15 -

<PAGE>   17



                  Agreement provided that this indemnity shall not apply in
                  cases of fraud, negligence, wilful default, bad faith or
                  misconduct.

13.      TERMINATION

         13.1 EnCap shall be entitled to resign its appointment hereunder:

                  (i)      by giving at any time not less than one year's notice
                           in writing to the Company expiring not earlier than
                           the date of the second anniversary hereof;

                  (ii)     at any time by notice in writing to the Company if
                           the Company shall go into liquidation or if a
                           receiver or administrative receiver or administrator
                           is appointed over any of the assets of the Company;

                  (iii)    at any time if the Company shall commit any breach of
                           its obligations under this Agreement and (if such
                           breach shall be capable of remedy) shall fail within
                           30 days of receipt of notice served by EnCap
                           requiring it so to do to make good such breach.

         13.2     The Company may terminate the appointment of EnCap hereunder:

                  (i)      if EnCap shall go into liquidation (except a
                           voluntary liquidation for the purposes of
                           reconstruction or amalgamation upon terms previously
                           approved in writing by the Company) or if a receiver
                           or administrative receiver or administrator is
                           appointed of any of the assets of EnCap or if a
                           meeting of EnCap's creditors is convened, or if any
                           analogous insolvency proceeding shall be taken in
                           respect of EnCap in any jurisdiction, or if EnCap
                           ceases or threatens to cease to carry on its
                           business;



                                     - 16 -

<PAGE>   18



                  (ii)     if EnCap shall commit any significant breach of its
                           obligations under this Agreement and (if such breach
                           be capable of remedy) shall fail within 30 days of
                           receipt of notice served by the Company requiring
                           them to make good such breach.

         13.3     The appointment of EnCap under this Agreement shall terminate
                  automatically upon the passing of a special resolution of the
                  Company pursuant to Section 84 of the Insolvency Act 1986
                  requiring the Company to be wound up.

         13.4     On termination of the appointment of EnCap under the
                  provisions of this Clause, EnCap shall be entitled to receive
                  all fees and other moneys accrued due up to the date of such
                  termination but shall not be entitled to compensation in
                  respect of such termination and EnCap shall deliver to the
                  Company or as it shall direct, all books of account, records,
                  registers, correspondence, documents and assets relating to
                  the affairs of or belonging to the Company or any subsidiary
                  in the possession of or under the control of EnCap and take
                  all necessary steps to vest in the Company any assets
                  previously held in the name of or to the order of EnCap on
                  behalf of the Company or any subsidiary.

14.      CONFIDENTIALITY

         14.1     Neither of the parties hereto shall during the continuance of
                  this Agreement or after its termination disclose to any
                  person, firm or fund whatsoever (except with the authority of
                  the relevant party or unless ordered to do so by a court of
                  competent jurisdiction) any information relating to the
                  business, investments, finances or other matters of a
                  confidential nature of the other party of which it may in the
                  course of its duties hereunder or otherwise become possessed
                  and each party shall use all reasonable endeavours to prevent
                  any such disclosure as aforesaid.



                                     - 17 -

<PAGE>   19



         14.2     EnCap and the Company shall be permitted to refer to the
                  appointment hereunder in their corporate literature provided
                  that the text of any such reference is approved by the other,
                  such approval not to be unreasonably withheld or delayed.

15.      RELIANCE ON DOCUMENTS

         Wherever pursuant to any provision of this Agreement any notice,
         instruction or other communication is to be given by, or on behalf of,
         the Company (or its Directors) to EnCap, EnCap may accept as sufficient
         evidence thereof:

         (i)      a document signed or purporting to be signed on behalf of the
                  issuing party or by such person or persons whose signature
                  EnCap is for the time being authorised by such issuing party
                  to accept; or

         (ii)     a message by tested telex, telecopler, facsimile machine, or
                  cable transmitted by, or on behalf of, the Company (or its
                  Directors) by such person or person whose messages EnCap is
                  for the time being authorised by the Company or its Directors
                  to accept, and EnCap shall not be obliged to accept any
                  document or message signed or transmitted or purporting to be
                  signed or transmitted by any other person.

16.      NOTICES

         Any notice given hereunder shall be in writing and shall be served by
         hand or by being sent by prepaid post or telex or telecopier or
         facsimile machine in the case of the Company to its registered office
         for the time being marked for the attention of the Secretary and in the
         case of EnCap to Messrs Hobson Audley, 7 Pilgrim Street, London EC4V
         6DR (marked for the attention of Mr M.C. Audley) or such other address
         in the United Kingdom from time to time notified to the Company for the
         service of notices.



                                     - 18 -

<PAGE>   20



17.      ASSIGNMENT

         Neither party hereto shall be entitled to assign or otherwise part with
         any interest in this Agreement unless the prior written consent of the
         other has been obtained.

18.      INVALIDITY

         The invalidity or unenforceability of any part of this Agreement shall
         not prejudice or affect the validity or enforceability of the
         remainder.

19.      PROPER LAW

         This Agreement and the rights and obligations of the parties shall be
         governed by and construed in accordance with the laws of England and
         the parties hereby submit to the non-exclusive jurisdiction of the
         Courts of England and Wales.

IN WITNESS whereof the parties hereto have caused this Agreement to be executed
the day and year first before written.


                                     - 19 -

<PAGE>   21



                                  SCHEDULE ONE

                                     PART A

                                INVESTMENT POLICY


Any investment will, at the time it is undertaken, be limited to 15 per cent of
the Company's assets. The Company will not take legal or management control of
underlying investments, nor will it be actively involved in the management of
the projects or entities which it invests.

Investments are expected to take the form of mezzanine-style debt instruments
together with long term equity in the form of royalty interests, net profit
interests, production payments, working interests and other interests in oil and
gas. The right is reserved also to hold other forms of debt or equity securities
including options or warrants and investments may take the form of partnership
arrangements, participations, joint ventures, limited liability company
interests, corporation shares and other forms of equity investment. Care will be
taken both on initial investment and on re-investment to ensure that sufficient
income will accrue to the Company as a return on capital invested to cover
administrative expenses and to permit a progressive dividend policy.

No investments will be made which require mandatory funding beyond a fixed
amount. Funding of any investment may be made in instalments.

Whilst the Company has the power to borrow up to its capital and reserves, there
is currently no intention to utilise this.

The Company will invest in project equity opportunities in the upstream sector
of the oil and gas industry where risks can be quantified by engineering
analysis. EnCap will only recommend Investments to the Directors which meet the
following criteria:



                                     - 20 -

<PAGE>   22



o        All investments will be supported by proved oil and gas reserves.

o        The proved oil and gas reserves must have been confirmed by a
         qualified, independent petroleum engineering firm chosen from a
         pre-approved list. Reserves will be risk valued according to category
         and specific opportunity with no value given to non-proven categories
         unless geological evidence is sufficient to justify inclusion of some
         probable value.

o        Proposed investments must offer a pre-tax return to the Company of at
         least 20% p.a. net of all fees and performance-related compensation.
         Evaluations will be made on the basis of reports provided by
         independent engineering firms utilising hydrocarbon price projections
         generally used by major commercial banks active in energy financing.

o        Neither EnCap nor the Company will act as operator for any oil and gas
         properties or projects. It will propose investments only where it
         believes that a proposed operator/ project sponsor has experienced
         management and personnel with high integrity and a proven track record
         and experience in the area where the investment is to be made. The
         operator must demonstrate sufficient financial strength both in terms
         of net worth and cash flow, to administer and operate the project
         throughout the expected term of the investment.

o        No investment will be proposed where a likelihood exists of adverse
         selection by the operator/project sponsor (i.e. minimal potential for
         conflicts of interest).

o        Each operator/project sponsor must contribute an acceptable portion of
         the cost of the project on a basis that is subordinate or similar to
         the investment to be made by the Company.

o        No Investment will be made unless the Partnership, EnCap or other funds
         managed by EnCap, or investors procured by EnCap also invest on a
         substantial basis.


                                     - 21 -

<PAGE>   23



                                  SCHEDULE ONE

                                     PART B

                             INVESTMENT RESTRICTIONS


(i)      A reasonable spread of investments will normally be maintained, any new
         investment being limited to not more than 15 per cent of the group's
         assets (before deducting borrowed money) at the time it is made, for
         which purpose any existing interest in the project must be aggregated
         with the proposed new investment;

(ii)     The policy statement set out in Schedule 1 Part A will be adhered to
         for at least 3 years from the date hereof;

(iii)    Dividends will only be paid to the extent that they are covered by
         income received from underlying investments, shares of profits of
         associated companies being unavailable for this purpose unless and
         until distributed to the Company; and

(iv)     Realisation of any investment carried at directors' valuation amounting
         to 50 per cent or more of the portfolio will be conditional on
         shareholders' approval.

None of the restrictions set out above will require the realisation of any
relevant asset of the Company where any of such restrictions is breached by
reason of any event outside the control of the Company and occurring after the
investment in the relevant asset is made or by reason of the receipt or exercise
of any rights, bonuses or benefits in the nature of capital, or any scheme of
arrangement for amalgamation, reconstruction, conversion or exchange, or of any
repayment or redemption.


                                     - 22 -

<PAGE>   24


SIGNED by                     )
for and on behalf of          )
ENERGY CAPITAL INVESTMENT     )
COMPANY PLC                   )
in the presence of:-          )



SIGNED by.                    )
for and on behalf of          )
EnCAP INVESTMENTS L.C.        )
in the presence of:-          )



                                     - 23 -






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