BURLINGTON RESOURCES COAL SEAM GAS ROYALTY TRUST
SC 13D/A, 1999-01-22
OIL ROYALTY TRADERS
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<PAGE>   1
================================================================================


                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                AMENDMENT NO. 28

                BURLINGTON RESOURCES COAL SEAM GAS ROYALTY TRUST
                                (NAME OF ISSUER)

                          UNITS OF BENEFICIAL INTEREST
                         (TITLE OF CLASS OF SECURITIES)

                                   122016 10 8
                                 (CUSIP NUMBER)

                                C. N. O'SULLIVAN
                                910 TRAVIS STREET
                                   SUITE 2150
                              HOUSTON, TEXAS 77002
                                 (713) 759-2030

                                 WITH A COPY TO:
                                BRIAN D. BARNARD
                              HAYNES AND BOONE, LLP
                                 201 MAIN STREET
                                   SUITE 2200
                             FORT WORTH, TEXAS 76132
                                 (817) 347-6600
          (NAME, ADDRESSES AND TELEPHONE NUMBERS OF PERSONS AUTHORIZED
                     TO RECEIVE NOTICES AND COMMUNICATIONS)

                                JANUARY 19, 1999
            (DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(d), (f) or (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 Rule 13d-7(b) for other
parties to whom copies are to be sent.

*The remainder of this 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 purposes 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


2



                                SCHEDULE 13D


CUSIP No. 122016 10 8                                         Page 2 of 20 Pages
                                                                  --    --
- --------------------------------------------------------------------------------
     1     NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     
              San Juan Partners, L.L.C.
- --------------------------------------------------------------------------------
     2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) 
                                                                        (a)  [x]
                                                                        (b)  [ ]
- --------------------------------------------------------------------------------
     3     SEC USE ONLY
     
- --------------------------------------------------------------------------------
     4     SOURCE OF FUNDS (See Instructions)
     
              N/A
- --------------------------------------------------------------------------------
     5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
           ITEMS 2(d) OR 2(e)                                                [ ]
     
- --------------------------------------------------------------------------------
     6     CITIZENSHIP OR PLACE OF ORGANIZATION
     
              Texas
- --------------------------------------------------------------------------------
                          7     SOLE VOTING POWER
                          
                                  *
                          ------------------------------------------------------
          NUMBER OF       8     SHARED VOTING POWER
           SHARES         
        BENEFICIALLY              *
          OWNED BY        ------------------------------------------------------
            EACH          9     SOLE DISPOSITIVE POWER
          REPORTING       
           PERSON                 * 
            WITH          ------------------------------------------------------
                          10    SHARED DISPOSITIVE POWER
                          
                                  * 
- --------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    
              * 
- --------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
             SHARES                                                          [ ]
    
- --------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
    
              * 
- --------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON*
    
              OO
- --------------------------------------------------------------------------------



*        The members(defined herein as "Parents") of San Juan Partners, L.L.C.
         have disposed of all of their limited liability company membership
         interests of San Juan Partners, L.L.C., and therefore no longer have
         any beneficial interest in the Units which are the subject of this
         Schedule 13D. Dominion Energy, Inc., by virtue of its acquisition of
         all of the limited liability company membership interests in San Juan
         Partners, L.L.C., became the beneficial owner, through San Juan
         Partners, L.L.C., of the Units beneficially owned by San Juan Partners,
         L.L.C. This filing is the terminating amendment by Parents of this
         Schedule 13D.




<PAGE>   3


3



                                 SCHEDULE 13D


CUSIP No. 122016 10 8                                         Page 3 of 20 Pages
                                                                  --    --
- --------------------------------------------------------------------------------
     1     NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     
              EnCap Energy Capital Fund III, L.P.
- --------------------------------------------------------------------------------
     2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                        (a)  [x]
                                                                        (b)  [ ]
- --------------------------------------------------------------------------------
     3     SEC USE ONLY
    

- --------------------------------------------------------------------------------
     4     SOURCE OF FUNDS (See Instructions)
     
              N/A
- --------------------------------------------------------------------------------
     5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
           ITEMS 2(d) OR 2(e)                                                [ ]
     
- --------------------------------------------------------------------------------
     6     CITIZENSHIP OR PLACE OF ORGANIZATION
     
              Texas
- --------------------------------------------------------------------------------
                          7     SOLE VOTING POWER
                          
                                  0
                          ------------------------------------------------------
          NUMBER OF       8     SHARED VOTING POWER
           SHARES                  
        BENEFICIALLY              0 Units
          OWNED BY        ------------------------------------------------------
            EACH          9     SOLE DISPOSITIVE POWER
          REPORTING                
           PERSON                 0
            WITH          ------------------------------------------------------
                          10    SHARED DISPOSITIVE POWER
                          
                                  0 Units
- --------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    
              0 Units
- --------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
           SHARES                                                            [ ]
    
- --------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
    
              0%
- --------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON*
    
              PN
- --------------------------------------------------------------------------------








<PAGE>   4


4


                                  SCHEDULE 13D



CUSIP No. 122016 10 8                                         Page 4 of 20 Pages
                                                                  --    --
- --------------------------------------------------------------------------------
     1     NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     
              EnCap Energy Acquisition III-B, Inc.
- --------------------------------------------------------------------------------
     2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                        (a)  [x]
                                                                        (b)  [ ]
- --------------------------------------------------------------------------------
     3     SEC USE ONLY
     
- --------------------------------------------------------------------------------
     4     SOURCE OF FUNDS (See Instructions)
     
              N/A
- --------------------------------------------------------------------------------
     5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
           ITEMS 2(d) OR 2(e)                                                [ ]
     
- --------------------------------------------------------------------------------
     6     CITIZENSHIP OR PLACE OF ORGANIZATION
     
              Texas
- --------------------------------------------------------------------------------
                          7     SOLE VOTING POWER
                                   
                                  0
                          ------------------------------------------------------
          NUMBER OF       8     SHARED VOTING POWER
           SHARES                  
        BENEFICIALLY              0 Units
          OWNED BY        ------------------------------------------------------
            EACH          9     SOLE DISPOSITIVE POWER
          REPORTING                
           PERSON                 0
            WITH          ------------------------------------------------------
                          10    SHARED DISPOSITIVE POWER
                                   
                                  0 Units
- --------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
              0 Units
- --------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
           SHARES                                                            [ ]
- --------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             
              0%
- --------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON*
             
              CO
- --------------------------------------------------------------------------------








<PAGE>   5


5


                                    SCHEDULE 13D



CUSIP No. 122016 10 8                                         Page 5 of 20 Pages
                                                                  --    --
- --------------------------------------------------------------------------------
     1     NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     
              ECIC Corporation
- --------------------------------------------------------------------------------
     2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                        (a)  [x]
                                                                        (b)  [ ]
- --------------------------------------------------------------------------------
     3     SEC USE ONLY
     
- --------------------------------------------------------------------------------
     4     SOURCE OF FUNDS (See Instructions)
     
              N/A
- --------------------------------------------------------------------------------
     5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
           ITEMS 2(d) OR 2(e)                                                [ ]
     
- --------------------------------------------------------------------------------
     6     CITIZENSHIP OR PLACE OF ORGANIZATION
     
              Texas
- --------------------------------------------------------------------------------
                          7     SOLE VOTING POWER
                                   
                                  0
                          ------------------------------------------------------
          NUMBER OF       8     SHARED VOTING POWER
           SHARES                  
        BENEFICIALLY              0 Units
          OWNED BY        ------------------------------------------------------
            EACH          9     SOLE DISPOSITIVE POWER
          REPORTING                
           PERSON                 0
            WITH          ------------------------------------------------------
                          10    SHARED DISPOSITIVE POWER
                                   
                                  0 Units
- --------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             
              0 Units
- --------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
           SHARES                                                            [ ]
             
- --------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             
              0%
- --------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON*
             
              CO
- --------------------------------------------------------------------------------








<PAGE>   6


6


                                  SCHEDULE 13D



CUSIP No. 122016 10 8                                         Page 6 of 20 Pages
                                                                  --    --
- --------------------------------------------------------------------------------
     1     NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     
              BOCP Energy Partners, L.P.
- --------------------------------------------------------------------------------
     2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)  
                                                                        (a)  [x]
                                                                        (b)  [ ]
- --------------------------------------------------------------------------------
     3     SEC USE ONLY
     
- --------------------------------------------------------------------------------
     4     SOURCE OF FUNDS (See Instructions)
     
              N/A
- --------------------------------------------------------------------------------
     5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
           ITEMS 2(d) OR 2(e)                                                [ ]
     
- --------------------------------------------------------------------------------
     6     CITIZENSHIP OR PLACE OF ORGANIZATION
     
              Texas
- --------------------------------------------------------------------------------
                          7     SOLE VOTING POWER
                                   
                                  0
                          ------------------------------------------------------
          NUMBER OF       8     SHARED VOTING POWER
           SHARES                  
        BENEFICIALLY              0 Units
          OWNED BY        ------------------------------------------------------
            EACH          9     SOLE DISPOSITIVE POWER
          REPORTING                
           PERSON                 0
            WITH          ------------------------------------------------------
                          10    SHARED DISPOSITIVE POWER
                                   
                                  0 Units
- --------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
              0 Units
- --------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
           SHARES                                                            [ ]
             
- --------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             
              0%
- --------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON*
             
              PN
- --------------------------------------------------------------------------------









<PAGE>   7


7


                                  SCHEDULE 13D




CUSIP No. 122016 10 8                                         Page 7 of 20 Pages
                                                                  --    --
- --------------------------------------------------------------------------------
     1     NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     
              First Union Investors, Inc.
- --------------------------------------------------------------------------------
     2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                        (a)  [x]
                                                                        (b)  [ ]
- --------------------------------------------------------------------------------
     3     SEC USE ONLY
     
- --------------------------------------------------------------------------------
     4     SOURCE OF FUNDS (See Instructions)
     
              N/A
- --------------------------------------------------------------------------------
     5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
           ITEMS 2(d) OR 2(e)                                                [ ]
     
- --------------------------------------------------------------------------------
     6     CITIZENSHIP OR PLACE OF ORGANIZATION
     
              North Carolina
- --------------------------------------------------------------------------------
                          7     SOLE VOTING POWER
                                   
                                  0
                          ------------------------------------------------------
          NUMBER OF       8     SHARED VOTING POWER
           SHARES                  
        BENEFICIALLY              0 Units
          OWNED BY        ------------------------------------------------------
            EACH          9     SOLE DISPOSITIVE POWER
          REPORTING                
           PERSON                 0
            WITH          ------------------------------------------------------
                          10    SHARED DISPOSITIVE POWER
                                   
                                  0 Units
- --------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             
              0 Units
- --------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
           SHARES                                                            [ ]
             
- --------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             
              0%
- --------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON*
             
              CO
- --------------------------------------------------------------------------------









<PAGE>   8


8


                                  SCHEDULE 13D




CUSIP No. 122016 10 8                                         Page 8 of 20 Pages
                                                                  --    --
- --------------------------------------------------------------------------------
     1     NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     
              Andover Group, Inc.
- --------------------------------------------------------------------------------
     2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                        (a)  [x]
                                                                        (b)  [ ]
- --------------------------------------------------------------------------------
     3     SEC USE ONLY
     
- --------------------------------------------------------------------------------
     4     SOURCE OF FUNDS (See Instructions)
     
              N/A
- --------------------------------------------------------------------------------
     5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
           ITEMS 2(d) OR 2(e)                                                [ ]
     
- --------------------------------------------------------------------------------
     6     CITIZENSHIP OR PLACE OF ORGANIZATION
     
              Texas
- --------------------------------------------------------------------------------
                          7     SOLE VOTING POWER
                                   
                                  0
                          ------------------------------------------------------
          NUMBER OF       8     SHARED VOTING POWER
           SHARES                  
        BENEFICIALLY              0 Units
          OWNED BY        ------------------------------------------------------
            EACH          9     SOLE DISPOSITIVE POWER
          REPORTING                
           PERSON                 0
            WITH          ------------------------------------------------------
                          10    SHARED DISPOSITIVE POWER
                                   
                                  0 Units
- --------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             
              0 Units
- --------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
           SHARES                                                            [ ]
             
- --------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             
              0%
- --------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON*
             
              CO
- --------------------------------------------------------------------------------









<PAGE>   9


9


                                  SCHEDULE 13D



CUSIP No. 122016 10 8                                         Page 9 of 20 Pages
                                                                  --    --
- --------------------------------------------------------------------------------
     1     NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     
              Charles T. McCord III
- --------------------------------------------------------------------------------
     2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                        (a)  [x]
                                                                        (b)  [ ]
- --------------------------------------------------------------------------------
     3     SEC USE ONLY
     
- --------------------------------------------------------------------------------
     4     SOURCE OF FUNDS (See Instructions)
     
              N/A
- --------------------------------------------------------------------------------
     5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
           ITEMS 2(d) OR 2(e)                                                [ ]
     
- --------------------------------------------------------------------------------
     6     CITIZENSHIP OR PLACE OF ORGANIZATION
     
              United States
- --------------------------------------------------------------------------------
                          7     SOLE VOTING POWER
                          
                                  0
                          ------------------------------------------------------
          NUMBER OF       8     SHARED VOTING POWER
           SHARES                  
        BENEFICIALLY              0 Units
          OWNED BY        ------------------------------------------------------
            EACH          9     SOLE DISPOSITIVE POWER
          REPORTING                
           PERSON                 0
            WITH          ------------------------------------------------------
                          10    SHARED DISPOSITIVE POWER
                                   
                                  0 Units
- --------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             
              0 Units
- --------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
           SHARES                                                            [ ]
             
- --------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             
              0%
- --------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON*
             
              IN
- --------------------------------------------------------------------------------









<PAGE>   10


10


                                  SCHEDULE 13D




CUSIP No. 122016 10 8                                       Page 10 of 20 Pages
                                                                 --    --
- --------------------------------------------------------------------------------
     1     NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     
              O'Sullivan Oil & Gas Company, Inc.
- --------------------------------------------------------------------------------
     2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                        (a)  [x]
                                                                        (b)  [ ]
- --------------------------------------------------------------------------------
     3     SEC USE ONLY
     
- --------------------------------------------------------------------------------
     4     SOURCE OF FUNDS (See Instructions)
     
              N/A
- --------------------------------------------------------------------------------
     5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
           ITEMS 2(d) OR 2(e)                                                [ ]
     
- --------------------------------------------------------------------------------
     6     CITIZENSHIP OR PLACE OF ORGANIZATION
     
              Texas
- --------------------------------------------------------------------------------
                          7     SOLE VOTING POWER
                                   
                                  0
                          ------------------------------------------------------
          NUMBER OF       8     SHARED VOTING POWER
           SHARES                  
        BENEFICIALLY              0 Units
          OWNED BY        ------------------------------------------------------
            EACH           9    SOLE DISPOSITIVE POWER
          REPORTING                
           PERSON                 0
            WITH          ------------------------------------------------------
                          10    SHARED DISPOSITIVE POWER
                                   
                                  0 Units
- --------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             
              0 Units
- --------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
           SHARES                                                            [ ]
             
- --------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             
              0%
- --------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON*
             
              CO
- --------------------------------------------------------------------------------










<PAGE>   11


11


                                  SCHEDULE 13D




CUSIP No. 122016 10 8                                        Page 11 of 20 Pages
                                                                  --    --
- --------------------------------------------------------------------------------
     1     NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     
              Christopher P. Scully
- --------------------------------------------------------------------------------
     2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                        (a)  [x]
                                                                        (b)  [ ]
- --------------------------------------------------------------------------------
     3     SEC USE ONLY
     
- --------------------------------------------------------------------------------
     4     SOURCE OF FUNDS (See Instructions)
     
              N/A
- --------------------------------------------------------------------------------
     5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
           ITEMS 2(d) OR 2(e)                                                [ ]
     
- --------------------------------------------------------------------------------
     6     CITIZENSHIP OR PLACE OF ORGANIZATION
     
              United States
- --------------------------------------------------------------------------------
                          7     SOLE VOTING POWER
                                   
                                  0
                          ------------------------------------------------------
          NUMBER OF       8     SHARED VOTING POWER
           SHARES                  
        BENEFICIALLY              0 Units
          OWNED BY        ------------------------------------------------------
            EACH          9     SOLE DISPOSITIVE POWER
          REPORTING                
           PERSON                 0
            WITH          ------------------------------------------------------
                          10    SHARED DISPOSITIVE POWER
                                   
                                  0 Units
- --------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             
              0 Units
- --------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
           SHARES                                                            [ ]
             
- --------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             
              0%
- --------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON*
             
              IN
- --------------------------------------------------------------------------------
<PAGE>   12

12


                                  SCHEDULE 13D




CUSIP No. 122016 10 8                                        Page 12 of 20 Pages
                                                                  --    --
- --------------------------------------------------------------------------------
    1     NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     
              Scott W. Smith Funding, L.L.C.
- --------------------------------------------------------------------------------
    2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)  
                                                                        (a)  [x]
                                                                        (b)  [ ]
- --------------------------------------------------------------------------------
    3     SEC USE ONLY
     
- --------------------------------------------------------------------------------
    4     SOURCE OF FUNDS (See Instructions)
     
              N/A
- --------------------------------------------------------------------------------
    5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
          TO ITEMS 2(d) OR 2(e)                                              [ ]
     
- --------------------------------------------------------------------------------
    6     CITIZENSHIP OR PLACE OF ORGANIZATION
     
              Texas
- --------------------------------------------------------------------------------
                            7       SOLE VOTING POWER
                            
                                      0
                            ----------------------------------------------------
          NUMBER OF         8       SHARED VOTING POWER
           SHARES           
        BENEFICIALLY                 0 Units
          OWNED BY          ----------------------------------------------------
            EACH            9       SOLE DISPOSITIVE POWER
          REPORTING         
           PERSON                     0
            WITH            ----------------------------------------------------
                            10      SHARED DISPOSITIVE POWER
                            
                                     0 Units
- --------------------------------------------------------------------------------
   11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    
              0 Units
- --------------------------------------------------------------------------------
   12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
          SHARES                                                             [ ]
             
- --------------------------------------------------------------------------------
   13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             
              0%
- --------------------------------------------------------------------------------
   14     TYPE OF REPORTING PERSON*
             
              OO
- --------------------------------------------------------------------------------









<PAGE>   13


13


                                  SCHEDULE 13D




CUSIP No. 122016 10 8                                        Page 13 of 20 Pages
                                                                  --    --
- --------------------------------------------------------------------------------
    1     NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     
              John V. Whiting
- --------------------------------------------------------------------------------
    2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                        (a)  [x]
                                                                        (b)  [ ]
- --------------------------------------------------------------------------------
    3     SEC USE ONLY
     
- --------------------------------------------------------------------------------
    4     SOURCE OF FUNDS (See Instructions)
     
              N/A
- --------------------------------------------------------------------------------
    5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
          TO ITEMS 2(d) OR 2(e)                                              [ ]
     
- --------------------------------------------------------------------------------
    6     CITIZENSHIP OR PLACE OF ORGANIZATION
     
              United States
- --------------------------------------------------------------------------------
                         7         SOLE VOTING POWER
                          
                                    0
                         -------------------------------------------------------
          NUMBER OF      8         SHARED VOTING POWER
           SHARES         
        BENEFICIALLY                0 Units
          OWNED BY       -------------------------------------------------------
            EACH         9         SOLE DISPOSITIVE POWER
          REPORTING       
           PERSON                   0
            WITH         -------------------------------------------------------
                         10         SHARED DISPOSITIVE POWER
                          
                                    0 Units
- --------------------------------------------------------------------------------
   11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             
              0 Units
- --------------------------------------------------------------------------------
   12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
          SHARES                                                             [ ]
             
- --------------------------------------------------------------------------------
   13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             
              0%
- --------------------------------------------------------------------------------
   14     TYPE OF REPORTING PERSON*
             
             IN
- --------------------------------------------------------------------------------










<PAGE>   14


14


         This Amendment No. 28 to Schedule 13D ("Amendment No. 28") amends the
Statement on Schedule 13D of San Juan Partners, L.L.C., a Texas limited
liability company (the "Purchaser"), and EnCap Energy Capital Fund III, L.P., a
Texas limited partnership ("EnCap Energy"), EnCap Energy Acquisition III-B,
Inc., a Texas corporation ("EnCap B"), ECIC Corporation, a Texas corporation
("ECIC"), BOCP Energy Partners, L.P., a Texas limited partnership ("BOCP"),
First Union Investors, Inc., a North Carolina corporation ("First Union
Investors"), Andover Group, Inc., a Texas corporation ("Andover"), Charles T.
McCord III, O'Sullivan Oil & Gas Company, Inc., a Texas corporation ("O'Sullivan
Oil"), Christopher P. Scully, Scott W. Smith Funding, L.L.C., a Texas limited
liability company ("Smith Funding"), and John V. Whiting (EnCap Energy, EnCap B,
ECIC, BOCP, First Union Investors, Andover, McCord, O'Sullivan Oil, Scully,
Smith Funding and Whiting collectively referred to herein as "Parents") with
respect to Units of Beneficial Interest (the "Units") of Burlington Resources
Coal Seam Gas Royalty Trust, a Delaware business trust (the "Trust").


ITEM 4.  PURPOSE OF THE TRANSACTION

Item 4 is amended as follows:

         On January 19, 1999 (the "Closing Date"), Dominion Energy, Inc., a
Virginia corporation ("Dominion") and each of the Parents entered into a
Purchase Agreement (the "Dominion Agreement"). Pursuant to the Dominion
Agreement, Parents sold all their units of limited liability company membership
interests (the "LLC Units") in Purchaser to Dominion. As a result of such sale,
Parents ceased to be beneficial owners of any Units of the Trust, and Dominion,
by virtue of its ownership of all of the outstanding LLC Units, became the
beneficial owner, through Purchaser, of all of the 5,867,968 Units of the Trust
beneficially owned by Purchaser, as well as the other properties owned by
Purchaser, including the rights of Purchaser under and pursuant to the Purchase
Agreement between Purchaser and Burlington Resources Oil and Gas Company
("BROG") dated October 21, 1998.

         All references to the Dominion Agreement contained in this Amendment
No. 28 are qualified in their entirety by reference to the provisions of such
agreement, which is filed as an Exhibit to this Schedule 13D. See Item 6 and
Item 7 to this Amendment No. 28.

         The Unadjusted Base Price (as defined in the Dominion Agreement) paid
by Dominion to Parents for Purchaser, giving effect to all of the assets of
Purchaser, including all of the BROG working interests and associated contract
rights and the Units and the South Texas Properties (as defined in the Dominion
Agreement), was $90,176,164 in cash which amount is subject to certain
post-closing adjustments as set forth in Section 2.2.2 of the Dominion
Agreement. These post-closing adjustments are expected to be finalized on or
prior to May 15, 1999. In addition to the Unadjusted Base Price, as adjusted,
Dominion also agreed to pay certain additional contingent consideration (the
"Contingent Consideration") to Parents under certain circumstances as set forth
in Sections 2.2.3, 2.5 and 2.6.4 of the Dominion Agreement. Also, under Section
2.2.4 of the Dominion Agreement, Dominion granted to each Parent the right to
participate in any and all Infill Wells (as defined in the Dominion Agreement)
drilled or completed in the Northeast Blanco Unit (as defined in the Dominion
Agreement) from and after the Closing Date, with respect to an aggregate
undivided forty seven and one-half percent (47.5%) of the interests owned by
Purchaser on the Closing Date, or acquired by Purchaser pursuant to a successful
purchase of the Remaining Royalty Interests as described below, less the Devon
Interest (as defined in the Dominion Agreement), if exercised by Devon.
Approximately eighty percent (80%) of the aggregate interest in Infill Wells
which will be owned by Purchaser if it successfully purchases the Remaining
Royalty Interests will be derived from the BROG working interests previously
acquired from BROG, and approximately twenty percent (20%) of such aggregate
interest will be derived from the Remaining Royalty Interests.

         As previously reported by Purchaser and Parents, on December 31, 1998,
pursuant to the Purchase Agreement dated October 21, 1998 by and between
Purchaser and BROG, Purchaser acquired, among other things, BROG's rights (i)
pursuant to Section 9.03(c) of the Trust Agreement, to make a written cash offer
to purchase the Remaining Royalty Interests owned by the Trust before the
sixtieth day following the meeting of the Unitholders (which occurred on
December 28, 1998) and at which the Unitholders voted to terminate the Trust,
and (ii) pursuant to Section 9.03(e) of the Trust Agreement, to purchase the
Remaining Royalty Interests for a cash price equal to 105% of the highest
acceptable offer received by the


<PAGE>   15


15

Trustee for such interests in the event the Trustee elects to defer action on
any original offer submitted pursuant to clause (i) above.

         Under the Dominion Agreement, Dominion has agreed that upon liquidation
of the Trust, Dominion shall cause Purchaser, pursuant to Purchaser's rights
under Section 9.03(c) of the Trust Agreement, to bid for the purchase of the
Remaining Royalty Interests in an amount not less than $61,600,000 and not more
than $74,800,000. If the Trustee does not allow the Purchaser to apply toward
the payment of Purchaser's bid amount (if successful) that amount which is
expected to be distributed to Purchaser as a Unitholder of the Trust pursuant to
the final liquidation distribution to be made to the Unitholders by the Trust
(the "Special Distribution"), then Parents shall pay to Dominion the interest,
at a rate specified in the Dominion Agreement, that would have been earned by
Dominion on such amount from the date Dominion pays the amount of the successful
bid through the date Purchaser receives its portion of the Special Distribution.

         If Purchaser is the successful bidder as provided in the preceding
paragraph, Dominion shall pay to Parents an amount equal to 100% of the
Remaining Royalty Holdback Amount (as defined in the Dominion Agreement) plus
interest from the Closing Date to the date of payment of such amount. In the
event the successful bid is less than $70,400,000, Dominion shall pay an
additional amount to Parents equal to 50% of the amount by which $70,400,000
exceeds the amount of the successful bid, multiplied by 35.19354%.

         Under the Dominion Agreement, in the event (i) Purchaser's bid for the
Remaining Royalty Interests pursuant to Section 9.03(c) of the Trust Agreement
as described above is not the successful bid for the Remaining Royalty
Interests, (ii) Dominion elects to cause Purchaser to exercise its rights under
Section 9.03(e) of the Trust Agreement to purchase the Remaining Royalty
Interests for an amount equal to 105% of the successful bid amount by a third
party, and (iii) such amount is equal to or less than $92,400,000, then Dominion
agrees to pay or cause Purchaser to pay such amount to the Trustee in
consideration for the Remaining Royalty Interests. In the event Purchaser so
purchases the Remaining Royalty Interests pursuant to its rights under Section
9.03(e) of the Trust Agreement, Dominion shall pay to Parents an amount equal to
the amount by which Remaining Royalty Holdback Amount exceeds the product of (a)
the amount paid for the Remaining Royalty Interests less $74,800,000, multiplied
by (b) 35.19354%, plus interest from the Closing Date to the date of payment of
such amount.

         If the amount required to purchase the Remaining Royalty Interests
pursuant to Section 9.03(e) of the Trust Agreement, as described in the
immediately preceding paragraph, is greater than $92,400,000, then Dominion
shall have the option to purchase the Remaining Royalty Interests at that price;
however, if Dominion exercises this option, then Dominion shall not be required
to pay to Parents any portion of the Remaining Royalty Holdback Amount and
Parents shall not be required to contribute any additional funds to the purchase
of the Remaining Royalty Interests in excess of the Remaining Royalty Holdback
Amount. In the event Dominion elects not to exercise the option described in the
preceding sentence, Parents and Dominion shall attempt to agree upon a mutually
acceptable resolution regarding the purchase of and payment for the Remaining
Royalty Interests; provided however, if Parents and Dominion are unable to agree
upon such a resolution, then Parents shall have the option to pay the amount in
excess of $92,400,000 required to purchase the Remaining Royalty Interests. In
the event Parents elect to exercise this option, Dominion shall cause Purchaser
to purchase the Remaining Royalty Interests. If Parents fail to exercise their
option to pay such amount in excess of $92,400,000 or fail to timely deliver
such amount to Dominion, then Dominion shall again have the option, but not the
obligation, to pay such additional amount required in excess of $92,400,000.

         In the event Dominion elects not to exercise its option described in
the last sentence of the immediately preceding paragraph, Parents' rights to the
Contingent Consideration and Parents' right to participate in Infill Wells, as
described above, shall thereupon terminate, and Parents shall be obligated to
repurchase from Dominion the BROG working interests and the South Texas
Properties for an amount equal to the Unadjusted Base Price, subject to certain
adjustments in accordance with Section 2.6.4 of the Dominion Agreement.

         Additionally, Parents agreed that neither they nor any related party
would, except for the provisions concerning bid procedures and amounts by
Purchaser described above in this Item 4, in any manner acquire, agree to
acquire or make any proposal to acquire the Remaining Royalty Interests or
advise, encourage, provide assistance (including financial assistance)


<PAGE>   16


16

or information or hold discussions with any other person in connection with the
sale of the Remaining Royalty Interests.

         The Dominion Agreement contains provisions (i) whereby Parents, on the
one hand, and Dominion on the other, agree to indemnify each other with respect
to breaches by any of them of the terms of the Dominion Agreement and (ii)
limiting the liability of Parents and Dominion to each other. Pursuant to
Section 5 of the Dominion Agreement, Parents have retained certain ongoing
obligations under the Dominion Agreement, including obligations to indemnify
Dominion and the Purchaser with respect to certain environmental, tax and other
liabilities.

         As a result of the forgoing transactions, Parents have no ongoing
beneficial interest in the Units and therefore the items specified in clauses
(a) through (j) of Item 4 of Schedule 13D promulgated under the Exchange Act 
are inapplicable.


ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

Item 5 is amended as follows:

         (c) Item 4 of this Amendment No. 28 describes all transactions in the 
Units effected by Purchaser and Parents since the filing of Amendment No. 27 to
the Purchaser's Schedule 13D.

         (e) As a result of the sale by Parents of the LLC Units described in
Item 4 above, Parents thereupon ceased to be the beneficial owner of any of the
Units, and this Amendment No. 28 is intended to be the final terminating
amendment to this Schedule 13D.


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

Item 6 is amended as follows:

         Item 4 of this Amendment No. 28 describes the principal terms of the
Dominion Agreement, which description is incorporated into this Item 6 by
reference thereto for all purposes. A copy of the Dominion Agreement is filed as
Exhibit (a) (19) to Item 7 of this Amendment No. 28, and all references to the
Dominion Agreement herein are qualified in their entirety by reference to such
Dominion Agreement.


ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS


         (a)(19)    Dominion Agreement, dated as of January 19, 1999, by and
                    among Dominion Energy, Inc., a Virginia corporation, and
                    EnCap Energy Capital Fund III, L.P., a Texas limited
                    partnership, EnCap Energy Acquisition III-B, Inc., a Texas
                    corporation, ECIC Corporation, a Texas corporation, BOCP
                    Energy Partners, L.P., a Texas limited partnership, First
                    Union Investors, Inc., a North Carolina corporation, Andover
                    Group, Inc., a Texas corporation, Charles T. McCord III,
                    O'Sullivan Oil & Gas Company, Inc., a Texas corporation,
                    Christopher P. Scully, Scott W. Smith Funding, L.L.C., a
                    Texas limited liability company, and John V. Whiting.



<PAGE>   17


17


                                  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: January 22, 1999          SAN JUAN PARTNERS, L.L.C.
      ----------------


                                By: /s/ C. N. O'Sullivan
                                   ----------------------------------------
                                Name:   C. N. O'Sullivan,
                                Title: President - O'Sullivan Oil & Gas
                                       Company, Inc., Manager


                                ENCAP ENERGY CAPITAL FUND III, L.P.
                                By: EnCap Investments, L.C., its general partner

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



                                ENCAP ENERGY ACQUISITION III-B, INC.


                                By: /s/ Robert L. Zorich
                                   ----------------------------------------
                                Name:   Robert L. Zorich
                                Title: President


                                ECIC CORPORATION


                                By: /s/ Robert L. Zorich
                                   ----------------------------------------
                                Name:   Robert L. Zorich
                                Title: President



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


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



                                FIRST UNION INVESTORS, INC.


                                By: /s/ Ted A. Gardner
                                   ----------------------------------------
                                Name:   Ted A. Gardner
                                Title:  Managing Partner



<PAGE>   18


18




                                ANDOVER GROUP, INC.



                                By: /s/ A. John Knapp, Jr.
                                   ----------------------------------------
                                Name:   A. John Knapp, Jr.
                                Title:  President



                                 /s/ Charles T. McCord III
                                -------------------------------------------
                                Charles T. McCord III



                                O'SULLIVAN OIL & GAS COMPANY, INC.



                                By: /s/ C. N. O'Sullivan
                                   ----------------------------------------
                                Name:   C. N. O'Sullivan
                                Title:  President



                                /s/ Christopher P. Scully
                                -------------------------------------------
                                Christopher P. Scully



                                SCOTT W. SMITH FUNDING, L.L.C.



                                By: /s/ Scott W. Smith
                                   ----------------------------------------
                                Name:   Scott W. Smith
                                Title:  Manager



                                /s/ John V. Whiting
                                -------------------------------------------
                                John V. Whiting





<PAGE>   19


19

                                 EXHIBIT INDEX


<TABLE>
<CAPTION>


Exhibit
Number                Description
- -------               -----------
<S>                   <C>
99.(a)(19)            Dominion Agreement, dated as of January 19, 1999, by and
                      among Dominion Energy, Inc., a Virginia corporation, and
                      EnCap Energy Capital Fund III, L.P., a Texas limited
                      partnership, EnCap Energy Acquisition III-B, Inc., a Texas
                      corporation, ECIC Corporation, a Texas corporation, BOCP
                      Energy Partners, L.P., a Texas limited partnership, First
                      Union Investors, Inc., a North Carolina corporation,
                      Andover Group, Inc., a Texas corporation, Charles T.
                      McCord III, O'Sullivan Oil & Gas Company, Inc., a Texas
                      corporation, Christopher P. Scully, Scott W. Smith
                      Funding, L.L.C., a Texas limited liability company, and
                      John V. Whiting.
</TABLE>




<PAGE>   1
                                                              EXHIBIT 99.(a)(19)



                            SAN JUAN PARTNERS, L.L.C.

                               PURCHASE AGREEMENT

                                       by

                         DOMINION ENERGY, INC., as Buyer

                                       and

             O'SULLIVAN OIL & GAS COMPANY, INC., et al., as Sellers






                            Dated: JANUARY 19, 1999,

                               BUT EFFECTIVE AS OF

                                 JANUARY 1, 1999



<PAGE>   2



                                TABLE OF CONTENTS

<TABLE>
<CAPTION>


                                                                                                      PAGE
                                                                                                      ----
<S>      <C>                                                                                        <C>
1.       DEFINITIONS...................................................................................1

2.       SALE AND TRANSFER OF LLC UNITS; CLOSING

          ............................................................................................11
                  2.1      LLC UNITS..................................................................11
                  2.2      CONSIDERATION..............................................................11
                                    2.2.1   TOTAL CONSIDERATION.......................................11
                                    2.2.2   CASH CONSIDERATION........................................11
                                    2.2.3   CONTINGENT CONSIDERATION..................................13
                                    2.2.4   RETAINED INTEREST IN INFILL WELLS.........................13
                  2.3      CLOSING....................................................................14
                  2.4      CLOSING OBLIGATIONS........................................................14
                  2.5      THE DEVON OPTION...........................................................15
                  2.6      PURCHASE OF REMAINING ROYALTY INTERESTS....................................15
                                    2.6.1   LIQUIDATION OF THE TRUST..................................15
                                    2.6.2   REQUIRED BID OF THE COMPANY...............................16
                                    2.6.3   PURCHASE FOR 105% OF HIGHEST ACCEPTABLE
                                            OFFER ....................................................16
                                    2.6.4   SELLERS' OBLIGATION TO REPURCHASE.........................17
                                    2.6.5   STANDSTILL................................................18

3.       REPRESENTATIONS AND WARRANTIES OF SELLERS....................................................19
                  3.1      ORGANIZATION AND GOOD STANDING.............................................19
                  3.2      AUTHORITY; NO CONFLICT.....................................................19
                  3.3      CAPITALIZATION.............................................................20
                  3.4      FINANCIAL STATEMENTS.......................................................21
                  3.5      BOOKS AND RECORDS..........................................................21
                  3.6      TITLE TO PROPERTIES; ENCUMBRANCES..........................................21
                  3.7      NO UNDISCLOSED LIABILITIES.................................................22
                  3.8      TAXES......................................................................22
                  3.9      NO MATERIAL ADVERSE CHANGE.................................................23
                  3.10     EMPLOYEES .................................................................23
                  3.11     COMPLIANCE WITH LEGAL REQUIREMENTS; GOVERNMENTAL
                           AUTHORIZATIONS.............................................................23
                  3.12     LEGAL PROCEEDINGS; ORDERS..................................................24
                  3.13     ABSENCE OF CERTAIN CHANGES AND EVENTS......................................25
                  3.14     CONTRACTS; NO DEFAULTS.....................................................26
                  3.15     INSURANCE..................................................................27
                  3.16     ENVIRONMENTAL MATTERS......................................................28
                  3.17     DISCLOSURE.................................................................29
</TABLE>


                                      - i -

<PAGE>   3


<TABLE>

<S>               <C>      <C>                                                                      <C>
                  3.18     AFFILIATE CONTRACTS........................................................29
                  3.19     BROKERS OR FINDERS.........................................................29
                  3.20     SECTION 29 TAX CREDIT WELLS................................................30
                  3.21     CERTAIN PRODUCTION MATTERS.................................................30
                  3.22     SEC FILINGS................................................................30
                  3.23     BURLINGTON PURCHASE AGREEMENT..............................................30

4.       REPRESENTATIONS AND WARRANTIES OF BUYER......................................................31
                  4.1      ORGANIZATION AND GOOD STANDING.............................................31
                  4.2      AUTHORITY; NO CONFLICT.....................................................31
                  4.3      INVESTMENT INTENT..........................................................31
                  4.4      CERTAIN PROCEEDINGS........................................................31
                  4.5      BROKERS OR FINDERS.........................................................32
                  4.6      FINANCING..................................................................32
                  4.7      ACKNOWLEDGMENTS............................................................32

5.       INDEMNIFICATION; REMEDIES ...................................................................33
                  5.1      SURVIVAL; RIGHT TO INDEMNIFICATION NOT AFFECTED BY
                           KNOWLEDGE..................................................................33
                  5.2      INDEMNIFICATION AND PAYMENT OF DAMAGES BY SELLERS..........................33
                  5.3      INDEMNIFICATION AND PAYMENT OF DAMAGES BY BUYER............................34
                  5.4      LIMITATIONS ON SELLERS' LIABILITY..........................................34
                  5.5      PROCEDURE FOR INDEMNIFICATION--THIRD PARTY CLAIMS...........................36

6.       POST-CLOSING COVENANTS.......................................................................37
                  6.1      SECURITIES FILINGS.........................................................37
                  6.2      PREPARATION AND FILING OF 1998 TAX RETURN..................................37
                  6.3      ASSISTANCE IN CONNECTION WITH TRANSITION MATTERS AND
                           THE PURCHASE OF THE REMAINING ROYALTY INTERESTS ...........................37

7.       GENERAL PROVISIONS...........................................................................37
                  7.1      EXPENSES...................................................................37
                  7.2      PUBLIC ANNOUNCEMENTS.......................................................38
                  7.3      SELLERS' REPRESENTATIVE; NOTICES...........................................38
                  7.4      JURISDICTION; SERVICE OF PROCESS...........................................39
                  7.5      FURTHER ASSURANCES.........................................................39
                  7.6      WAIVER.....................................................................39
                  7.7      ENTIRE AGREEMENT AND MODIFICATION..........................................40
                  7.8      DISCLOSURE LETTER..........................................................40
                  7.9      ASSIGNMENTS, SUCCESSORS, AND NO THIRD-PARTY RIGHTS.........................40
                  7.10     SEVERABILITY...............................................................41
                  7.11     SECTION HEADINGS, CONSTRUCTION.............................................41
                  7.12     TIME OF ESSENCE............................................................41
                  7.13     GOVERNING LAW..............................................................41
                  7.14     COUNTERPARTS...............................................................41
</TABLE>



                                     - ii -

<PAGE>   4



                            SAN JUAN PARTNERS, L.L.C.
                               PURCHASE AGREEMENT


         This Purchase Agreement ("Agreement") is made January 19, 1999, but
effective as of January 1, 1999, by Dominion Energy, Inc., a Virginia
corporation ("Buyer"), ENCAP Energy Capital Fund III, L.P., a Texas limited
partnership, ENCAP Energy Acquisition III-B, Inc., a Texas corporation, ECIC\
Corporation, a Texas corporation, BOCP Energy Partners, L.P., a Texas limited
partnership, First Union Investors, Inc., a North Carolina corporation,
O'Sullivan Oil & Gas Company, Inc., a Texas corporation, Christopher P. Scully,
an individual resident in Houston, Texas, Charles T. McCord III, an individual
resident in Houston, Texas, Scott W. Smith Funding, LLC, a Texas limited
liability company, John V. Whiting, an individual resident in Houston, Texas,
and Andover Group, Inc., a Texas corporation (all of the above listed parties,
other than Buyer, are called herein collectively "Sellers" and individually
"Seller").

                                    RECITALS

         Sellers desire to sell, and Buyer desires to purchase, all of the
issued and outstanding units (the "LLC Units"), regardless of type, of limited
liability company membership interests of San Juan Partners, L.L.C., a Texas
limited liability company (the "Company") and become a member of the Company as
a result thereof, for the consideration and on the terms set forth in this
Agreement.

                                    AGREEMENT

         The parties, intending to be legally bound, agree as follows:

1.       DEFINITIONS

         For purposes of this Agreement, the following terms have the meanings
specified or referred to in this Section 1:

         "ACCOUNTING FIRM"--As defined in Section 2.2.2 of this Agreement.

         "AFE"--As defined in Section 2.2.4 of this Agreement.

         "AGREED RATE"--a floating per annum rate of interest equal to the
ninety (90) day federal treasury bill rate as set forth in the Key Interest
Rates table of the Wall Street Journal for each week during the calculation
period.

         "AGREEMENT"--as defined in the first paragraph of this Agreement.

         "APPLICABLE CONTRACT"--any Contract (a) under which the Company has or
may acquire any rights, (b) under which the Company has or may become subject to
any obligation or liability, including, without limitation, authorities for
expenditures and joint operating agreements, or (c) by which the Company or any
of the assets owned or used by it is or may become bound.





<PAGE>   5



         "ASSETS"--all assets of the Company, including without limitation the
following: (i) the New Mexico Properties, (ii) all other rights, benefits,
duties and obligations acquired by the company pursuant to the Burlington
Purchase Agreement including, without limitation, rights in, to and under the
Unit Agreement, Unit Operating Agreement, Leases, Equipment, Trust Agreement and
the Net Profits Conveyance (as each of the foregoing are defined in the
Burlington Purchase Agreement), (iii) all rights, benefits, duties and
obligations of the Company in and to the Burlington Purchase Agreement, (iv) the
South Texas Properties, (v) 5,702,968 Trust Units, (vi) all Records of the
Company, and (vii) all Contracts to which the Company is a party.

         "BEST EFFORTS"--the efforts that a prudent Person desirous of achieving
a result would use in similar circumstances to ensure that such result is
achieved as expeditiously as possible.

         "BREACH"--a "Breach" of a representation, warranty, covenant,
obligation, or other provision of this Agreement or any instrument delivered
pursuant to this Agreement will be deemed to have occurred if there is or has
been (a) any inaccuracy in or breach of, or any failure to perform or comply
with, such representation, warranty, covenant, obligation, or other provision,
or (b) any claim (by any Person) or other occurrence or circumstance that is or
was inconsistent with such representation, warranty, covenant, obligation, or
other provision, and the term "Breach" means any such inaccuracy, breach,
failure, claim, occurrence, or circumstance.

         "BROKER LETTER"--As defined in Section 3.19.

         "BURLINGTON PURCHASE AGREEMENT"-that certain Purchase and Sale
Agreement dated October 21, 1998 between Burlington Resources Oil & Gas Company
and the Company.

         "BUYER"--as defined in the first paragraph of this Agreement.

         "CASH CONSIDERATION"-- as defined in Section 2.2.1.

          "CLOSING"--as defined in Section 2.3.

         "CLOSING DATE"--the date and time as of which the Closing actually
takes place.

         "COMPANY"--as defined in the Recitals of this Agreement.

         "COMPANY'S BID DISTRIBUTION"--as defined in Section 2.6.2.

         "CONSENT"--any approval, consent, ratification, waiver, or other
authorization (including any Governmental Authorization).

         "CONTEMPLATED TRANSACTIONS"--all of the transactions contemplated by
this Agreement, including:

         (a) the sale of the LLC Units by Sellers to Buyer;



                                      - 2 -

<PAGE>   6



         (b) the performance by Buyer and Sellers of their respective covenants
and obligations under this Agreement; and

         (c) Buyer's acquisition and ownership of the LLC Units, admission as
the sole member of the Company and exercise of control over the Company.

         "CONTINGENT CONSIDERATION"--As defined in Section 2.2.3 of this
Agreement.

         "CONTRACT"--any agreement, contract, obligation, promise, or
undertaking (whether written or oral and whether express or implied) that is
legally binding.

         "DAMAGES"--as defined in Section 5.2.


         "DEVON"--as defined in Section 2.5.

         "DEVON AGREEMENT"--as defined in Section 2.5.

         "DEVON HOLDBACK AMOUNT"--the amount set forth in Section 2.5(d) of the
Disclosure Letter.

         "DEVON INTEREST"--as defined in Section 2.5.

         "DEVON OPTION"--as defined in Section 2.5.

         "DEVON PAYMENT"--the amount paid by Devon to the Company if Devon
exercises the Devon Option.

         "DEVON SHORTFALL"--as defined in Section 2.5.

         "DISCLOSURE LETTER"--the disclosure letter delivered by Sellers to
Buyer concurrently with the execution and delivery of this Agreement.

         "ENCUMBRANCE"--any charge, claim, community property interest,
condition, equitable interest, lien, option, pledge, security interest, right of
first refusal, or restriction of any kind, including any restriction on use,
voting, transfer, receipt of income, or exercise of any other attribute of
ownership.

         "ENVIRONMENT"--soil, land surface or subsurface strata, surface waters
(including navigable waters, ocean waters, streams, ponds, drainage basins, and
wetlands), groundwaters, drinking water supply, stream sediments, ambient air
(including indoor air), plant and animal life, and any other environmental
medium or natural resource.

         "ENVIRONMENTAL ASSESSMENT"-- the Phase I Environmental Site Assessment
Report, 121 Sites in the Northeast Blanco Unit San Juan and Rio Arriba Counties,
New Mexico, dated December 14, 1998 and Addendum No. 1, dated December 15, 1998
prepared by AGRA Earth & Environmental ("AGRA") together with letter dated
January 6, 1994 from AGRA to the Company.


                                      - 3 -

<PAGE>   7



         "ENVIRONMENTAL, HEALTH, AND SAFETY LIABILITIES"--any cost, damages,
expense, liability, obligation, or other responsibility arising from or under
Environmental Law or Occupational Safety and Health Law and consisting of or
relating to:

         (a) any environmental, health, or safety matters or conditions
(including on-site or off-site contamination, occupational safety and health,
and regulation of chemical substances or products);

         (b) fines, penalties, judgments, awards, settlements, legal or
administrative proceedings, damages, losses, claims, demands and response,
investigative, remedial, or inspection costs and expenses arising under
Environmental Law or Occupational Safety and Health Law;

         (c) financial responsibility under Environmental Law or Occupational
Safety and Health Law for cleanup costs or corrective action, including any
investigation, cleanup, removal, containment, or other remediation or response
actions ("Cleanup") required by applicable Environmental Law or Occupational
Safety and Health Law (whether or not such Cleanup has been required or
requested by any Governmental Body or any other Person) and for any natural
resource damages; or

         (d) any other compliance, corrective, investigative, or remedial
measures required under Environmental Law or Occupational Safety and Health Law.

         The terms "removal," "remedial," and "response action," include the
types of activities covered by the United States Comprehensive Environmental
Response, Compensation, and Liability Act, 42 U.S.C. ss. 9601 et seq., as
amended ("CERCLA").

         "ENVIRONMENTAL LAW"--any Legal Requirement that requires or relates to:

         (a) advising appropriate authorities, employees, and the public of
intended or actual releases of pollutants or hazardous substances or materials,
violations of discharge limits, or other prohibitions and of the commencements
of activities, such as resource extraction or construction, that could have
significant impact on the Environment;

         (b) preventing or reducing to acceptable levels the release of
pollutants or hazardous substances or materials into the Environment;

         (c) reducing the quantities, preventing the release, or minimizing the
hazardous characteristics of wastes that are generated;

         (d) assuring that products are designed, formulated, packaged, and used
so that they do not present unreasonable risks to human health or the
Environment when used or disposed of;

         (e) protecting resources, species, or ecological amenities;

         (f) reducing to acceptable levels the risks inherent in the
transportation of hazardous substances, pollutants, oil, or other potentially
harmful substances;



                                      - 4 -

<PAGE>   8



         (g) cleaning up pollutants that have been released, preventing the
threat of release, or paying the costs of such clean up or prevention; or

         (h) making responsible parties pay private parties, or groups of them,
for damages done to their health or the Environment, or permitting
self-appointed representatives of the public interest to recover for injuries
done to public assets.

         "EXCHANGE ACT"--as defined in Section 3.5 hereof.

         "FINAL ADJUSTED BASE PRICE"--as defined in Section 2.2.2.

         "FINAL ADJUSTMENT"--as defined in Section 2.2.2.

         "FINAL REPURCHASE AMOUNT"--as defined in Section 2.6.4(c).

         "FINAL SETTLEMENT STATEMENT"--as defined in Section 2.2.2.

         "FRUITLAND COAL FORMATION" --the coal seam with vertical limits
comprising all coal seams within the equivalent of the stratigraphic interval
from a depth of approximately 2,450 feet to 2,880 feet as shown on the Gamma
Ray/Bulk Density Log from Amoco Production Company's Schneider Gas Company "B"
Well No. 1 located 1,110 feet from the South line and 1,185 feet from the West
line of Section 28, Township 32 North, Range 10 West, NMPM, San Juan County, New
Mexico.

         "GAAP"--United States generally accepted accounting principles in
effect from time to time.

         "GATHERING AGREEMENT"--the Gas Gathering Dehydrating and Treating
Agreement dated May 3, 1990 between Meridian Oil Gathering, Inc. and Meridian
Oil Trading, Inc., as amended to date.

         "GOVERNMENTAL AUTHORIZATION"--any approval, consent, license, permit,
waiver, or other authorization issued, granted, given, or otherwise made
available by or under the authority of any Governmental Body or pursuant to any
Legal Requirement.

         "GOVERNMENTAL BODY"--any:

         (a) nation, state, county, city, town, village, district, or other
jurisdiction of any nature;

         (b) federal, state, local, municipal, foreign, or other government;

         (c) governmental or quasi-governmental authority of any nature
(including any governmental agency, branch, department, official, or entity and
any court or other tribunal);

         (d) multi-national organization or body; or



                                      - 5 -

<PAGE>   9



         (e) body exercising, or entitled to exercise, any administrative,
executive, judicial, legislative, police, regulatory, or taxing authority or
power of any nature.

         "HAZARDOUS MATERIALS"--any waste or other substance that is listed,
defined, designated, or classified as, or otherwise determined to be, hazardous,
radioactive, or toxic or a pollutant or a contaminant under or pursuant to any
Environmental Law, including any admixture or solution thereof.

         "HIGHEST ACCEPTABLE OFFER"-pursuant to Section 9.03(e) of the Trust
Agreement, after termination of the Trust, the highest offer, net of any
commissions or other fees payable by the Trust, made for the purchase of the
Remaining Royalty Interests.

         "INDEMNIFIED PERSONS"--as defined in Section 5.2.

         "INFILL WELL PROVISIONS"--as defined in Section 2.2.4.

         "INFILL WELLS"-all wells drilled in the Northeast Blanco Unit after the
date hereof as a result of a change to existing spacing regulation for the
Fruitland Coal Formation or a change allowing additional wells to be drilled on
a drilling or spacing unit for the Fruitland Coal Formation, in each case after
the date hereof, together with all replacement wells drilled for any such
additional wells.

         "IRC"--the Internal Revenue Code of 1986 or any successor law, and
regulations issued by the IRS pursuant to the Internal Revenue Code or any
successor law.

         "IRS"--the United States Internal Revenue Service or any successor
agency, and, to the extent relevant, the United States Department of the
Treasury.

         "KNOWLEDGE"--an individual will be deemed to have "Knowledge" of a
particular fact or other matter if:

         (a) such individual is actually aware of such fact or other matter; or

         (b) a prudent individual could be expected to discover or otherwise
become aware of such fact or other matter in the course of conducting a
reasonably comprehensive investigation concerning the existence of such fact or
other matter.

         A Person (other than an individual) will be deemed to have "Knowledge"
of a particular fact or other matter if any individual who is serving, or who
has at any time served, as a director, officer, partner, member, executor, or
trustee of such Person (or in any similar capacity) has, or at any time had,
Knowledge of such fact or other matter.

         "LEGAL REQUIREMENT"--any federal, state, local, municipal, foreign,
international, multinational, or other administrative order, constitution, law,
ordinance, principle of common law, regulation, statute, or treaty.

         "LLC UNITS"--as defined in the Recitals of this Agreement.


                                      - 6 -

<PAGE>   10



         "NET PROFITS CONVEYANCE"--that certain Net Profits Interest Conveyance
dated as of May 1, 1993 from Meridian Oil Production Inc. in favor of the Trust.

         "NEW MEXICO PROPERTIES"-- all of the Company's working and net revenue
interest in and to the Northeast Blanco Unit as more particularly set forth in
Section 1 of the Disclosure Letter.

         "NORTHEAST BLANCO UNIT"--the unit formed for the exploration and
production of hydrocarbons from the Fruitland Coal Formation pursuant to that
certain Unit Agreement for the Development and Operation of the Northeast Blanco
Unit Area dated July 16, 1951, recorded in Book 182, Page 52 of the real
property records of San Juan County, New Mexico and Volume 11, Page 361 of the
real property records of Rio Arriba County, New Mexico.

         "ORDER"--any award, decision, injunction, judgment, order, ruling,
subpoena, or verdict entered, issued, made, or rendered by any court,
administrative agency, or other Governmental Body or by any arbitrator.

         "ORDINARY COURSE OF BUSINESS"--an action taken by a Person will be
deemed to have been taken in the "Ordinary Course of Business" only if:

         (a) such action is consistent with the past practices of such Person
and is taken in the ordinary course of the normal day-to-day operations of such
Person;

         (b) such action is not required to be authorized by the board of
directors of such Person (or by any Person or group of Persons exercising
similar authority); and

         (c) such action is similar in nature and magnitude to actions
customarily taken, without any authorization by the board of directors (or by
any Person or group of Persons exercising similar authority), in the ordinary
course of the normal day-to-day operations of other Persons that are in the same
line of business as such Person.

         "ORGANIZATIONAL DOCUMENTS"--(a) the articles or certificate of
incorporation and the bylaws of a corporation; (b) the partnership agreement and
any statement of partnership of a general partnership; (c) the limited
partnership agreement and the certificate of limited partnership of a limited
partnership; (d) any charter or similar document adopted or filed in connection
with the creation, formation, or organization of a Person; (e) any limited
liability company articles of organization, certificate of organization and
regulations; and (f) any amendment to any of the foregoing.

         "PERMITTED ENCUMBRANCES"--As defined in Section 3.6 of this Agreement.

         "PERSON"--any individual, corporation (including any non-profit
corporation), general or limited partnership, limited liability company, joint
venture, estate, trust, association, organization, labor union, or other entity
or Governmental Body.

         "PRELIMINARY ADJUSTED BASE PRICE"--as defined in Section 2.2.2.



                                      - 7 -

<PAGE>   11



         "PRELIMINARY ADJUSTMENT"--as defined in Section 2.2.2.

         "PRELIMINARY CLOSING STATEMENT"-- as defined in Section 2.2.2.

         "PROCEEDING"--any action, arbitration, audit, hearing, investigation,
litigation, or suit (whether civil, criminal, administrative, investigative, or
informal) commenced, brought, conducted, or heard by or before, or otherwise
involving, any Governmental Body or arbitrator.

         "PROPERTIES"--the New Mexico Properties and South Texas Properties,
collectively.

         "RECORDS"--all lease files, land files, well files, gas and oil sales
contract files, gas treating, gathering and processing files, division order
files, abstracts, title opinions, land surveys, technical information, insurance
policies and bonds, contracts, evidence that Taxes have been paid, computer
sensible copies of all computer records, written plans for exploration and
development, applications, inspection reports, environmental impact statements,
assessments and studies, permits, licenses, orders, consents, and all other
books, records, intangibles, files, maps and accounting records with respect to
the Properties or the business of the Company to the extent owned by or under
the control of the Company or Sellers..

         "RELATED PERSON"--with respect to a particular individual:

         (a) each other member of such individual's Family (as hereinafter
defined);

         (b) any Person that is directly or indirectly controlled by such
individual or one or more members of such individual's Family;

         (c) any Person in which such individual or members of such individual's
Family hold (individually or in the aggregate) a Material Interest (as
hereinafter defined); and

         (d) any Person with respect to which such individual or one or more
members of such individual's Family serves as a director, officer, partner,
executor, or trustee (or in a similar capacity).

         With respect to a specified Person other than an individual:

         (a) any Person that directly or indirectly controls, is directly or
indirectly controlled by, or is directly or indirectly under common control with
such specified Person;

         (b) any Person that holds a Material Interest in such specified Person;

         (c) each Person that serves as a director, officer, partner, executor,
or trustee of such specified Person (or in a similar capacity);

         (d) any Person in which such specified Person holds a Material
Interest;



                                      - 8 -

<PAGE>   12



         (e) any Person with respect to which such specified Person serves as a
general partner or a trustee (or in a similar capacity); and

         (f) any Related Person of any individual described in clause (b) or
(c).

         For purposes of this definition, (a) the "Family" of an individual
includes (i) the individual, (ii) the individual's spouse and former spouses,
(iii) any other natural person who is related to the individual or the
individual's spouse within the second degree, and (iv) any other natural person
who resides with such individual, and (b) "Material Interest" means direct or
indirect beneficial ownership (as defined in Rule 13d-3 under the Securities
Exchange Act of 1934) of voting securities or other voting interests
representing at least 10% of the outstanding voting power of a Person or equity
securities or other equity interests representing at least 10% of the
outstanding equity securities or equity interests in a Person.

         "REMAINING ROYALTY HOLDBACK AMOUNT"--$6,194,064.

         "REMAINING ROYALTY INTERESTS"-all of the Royalty Interests owned by the
Trust on the date of termination of the Trust pursuant to Section 9.03(b) of the
Trust Agreement.

         "REPRESENTATIVE"--with respect to a particular Person, any director,
officer, employee, agent, consultant, advisor, or other representative of such
Person, including legal counsel, accountants, and financial advisors.

         "REPURCHASE AMOUNT"--as defined in Section 2.6.4 hereof.

         "REPURCHASE FINAL SETTLEMENT STATEMENT"--as defined in Section 2.6.4(c)
hereof.

         "REPURCHASE SETTLEMENT STATEMENT DELIVERY DATE"--as defined in Section
2.6.4(c) hereof.

         "REQUIRED BID AMOUNT"--as defined in Section 2.6.2 of this Agreement.

         "RETAINED INTEREST"--as defined in Section 2.2.4 of this Agreement.

         "ROYALTY INTERESTS"-has the same meaning given such term in Article II
of Net Profit Conveyance.

         "SEC DOCUMENTS"--As defined in Section 3.22.

         "SECURITIES ACT"--the Securities Act of 1933 or any successor law, and
regulations and rules issued pursuant to that Act or any successor law.

         "SELLERS"--as defined in the first paragraph of this Agreement.

         "SELLERS' ACCOUNT"--as defined in Section 2.2.1 of this Agreement.



                                      - 9 -

<PAGE>   13



         "SELLERS' REPRESENTATIVE"--O'Sullivan Oil & Gas Company, Inc., a Texas
corporation, or upon thirty (30) days prior written notice to Buyer, such other
Person as shall be designated by Sellers.

         "SETTLEMENT STATEMENT DELIVERY DATE"--As defined in Section 2.2.2 of
this Agreement.

         "SOUTH TEXAS PROPERTIES"-- all, right, title and interest of the
Company in and to the properties located in Goliad, Kleberg, Jim Hogg and Lavaca
Counties in the State of Texas as more particularly set forth in Section 1 of
the Disclosure Letter.

         "SPECIAL DISTRIBUTION"--as defined in the Trust Agreement.

         "SUBSIDIARY"--with respect to any Person (the "Owner"), any corporation
or other Person of which securities or other interests having the power to elect
a majority of that corporation's or other Person's board of directors or similar
governing body, or otherwise having the power to direct the business and
policies of that corporation or other Person (other than securities or other
interests having such power only upon the happening of a contingency that has
not occurred) are held by the Owner or one or more of its Subsidiaries; when
used without reference to a particular Person, "Subsidiary" means a Subsidiary
of the Company.

         "TAXES" -- all federal, foreign, state, local or other net or gross
income (whether measured by or based on income), gross receipts, profits,
capital, wealth, social security, sales, use, stamp, documentary, transfer,
occupation, environmental, service, rental, lease, real property gains or
transfer, ad valorem, property (including in-lieu-of taxes), value added,
franchise, production, severance, withholding, payroll, employment, excise or
similar taxes, assessments, duties, fees, levies or other governmental charges,
together with any interest thereon, any penalties, additions to tax or
additional amounts with respect thereto and any interest in respect of such
penalties, additions or additional amounts.

         "TAX RETURN"--any return (including any information return), report,
statement, schedule, notice, form, or other document or information filed with
or submitted to, or required to be filed with or submitted to, any Governmental
Body in connection with the determination, assessment, collection, or payment of
any Taxes or in connection with the administration, implementation, or
enforcement of or compliance with any Legal Requirement relating to any Taxes.

         "THREATENED"--a claim, Proceeding, dispute, action, or other matter
will be deemed to have been "Threatened" if any demand or statement has been
made (orally or in writing) or any notice has been given (orally or in writing),
or if any other event has occurred or any other circumstances exist, that would
lead a prudent Person to conclude that such a claim, Proceeding, dispute,
action, or other matter is likely to be asserted, commenced, taken, or otherwise
pursued in the future.

         "TRIGGER DATE"--As defined in Section 2.6.4 of this Agreement.

         "TRUST"-Burlington Resources Coal Seam Gas Royalty Trust created
pursuant to the Trust Agreement.



                                     - 10 -

<PAGE>   14



         "TRUST AGREEMENT"-the Trust Agreement of Burlington Resources Coal Seam
Gas Royalty Trust dated May 1, 1993 among Meridian Oil Production Inc.,
Burlington Resources Inc, Mellon Bank (DE) National Association, and NationsBank
of Texas, N.A.

         "TRUST UNITS"-certificated, undivided pro rata fractional interests in
the beneficial rights of the Trust, as determined pursuant to the Trust
Agreement.

         "UNADJUSTED BASE PRICE"--$90,176,164.

         "UNRESOLVED CLAIM"--As defined in Section 2.7.

2.       SALE AND TRANSFER OF LLC UNITS; CLOSING

         2.1      LLC UNITS

         Subject to the terms and conditions of this Agreement, at the Closing,
Sellers will sell and transfer the LLC Units to Buyer, and Buyer will purchase
the LLC Units from Sellers.

         2.2      CONSIDERATION

                  2.2.1    TOTAL CONSIDERATION

         The total consideration for the LLC Units is the Unadjusted Base Price,
as adjusted pursuant to Section 2.2.2 (the "Cash Consideration"), together with
the Contingent Consideration and Retained Interest set forth in Sections 2.2.3
and 2.2.4. The Cash Consideration shall be paid by Buyer to Sellers collectively
at Closing by wire transfer of immediately available funds to the SJP Stub
Liquidating Trust, Account No. 1566568059 at Bank One, Houston, Texas (the
"Sellers' Account") or as otherwise directed by Sellers' Representative.

                  2.2.2    CASH CONSIDERATION

                  (a)      The Unadjusted Base Price shall be increased by:

                           (i)  The Devon Payment;

                           (ii) The revenues received by or credited to Buyer
                  attributable to periods prior to January 1, 1999 other than
                  distributions received by the Company from the Trust with
                  respect to the fourth quarter of 1998 and operating costs
                  charged to and paid by Sellers attributable to periods after
                  January 1, 1999.

                  (b)      The Unadjusted Base Price shall be decreased by:

                           (i)  $305,426 being the value of tax credits
                  attributable to the 479R Well included in the New Mexico
                  Properties if it were to qualify for tax credits pursuant to
                  Section 29 of the IRC;


                                     - 11 -

<PAGE>   15



                           (ii)  Revenues received by or credited to Sellers
                  attributable to periods after January 1, 1999 and all
                  operating costs or capital expenses charged to and paid by
                  Buyer attributable to periods prior to January 1, 1999;




                                     - 12 -

<PAGE>   16



                           (iii) Any fees charged by the Trust to the Company in
                  connection with the liquidation of the Remaining Royalty
                  Interests including, without limitation, the fees of Albrecht
                  & Associates; and

                           (iv)  Any general and administrative costs incurred
                  by or on behalf of the Company solely in connection with this
                  Agreement or the Contemplated Transactions other than any
                  expenses incurred by Buyer in connection therewith; and

                           (v)   The Devon Shortfall.

                  (c)      Not later than two (2) days prior to Closing,
         Sellers' Representative shall prepare a preliminary calculation of all
         adjustments to be made pursuant to Sections 2.2.2(a) and (b) in the
         form attached hereto as Exhibit A (the "Preliminary Closing Statement")
         based on Sellers' Representative's good faith estimate of the
         adjustments. The Unadjusted Base Price shall be adjusted for Closing
         purposes by the net adjustment (the "Preliminary Adjustment") set forth
         in the Preliminary Closing Statement. (The Unadjusted Base Price as
         adjusted by the Preliminary Adjustment is referred to as the
         "Preliminary Adjusted Base Price"). Nothing in this Section 2.2.2(c)
         shall diminish Buyer's or Sellers' rights to a full accounting as set
         forth in Section 2.2.2(d), it being the agreement of the parties that
         the Final Adjusted Base Price will be determined in accordance with the
         procedures set forth in Section 2.2.2(d).

                  (d)      Not later than the later to occur of (i) ten (10) 
         days following the closing of the sale of the Devon Interest to Devon,
         if Devon exercises the Devon Option or (ii) May 15, 1999, if Devon does
         not exercise the Devon Option, Buyer shall prepare and deliver to
         Sellers' Representative a proposed settlement statement setting forth
         any required additional adjustments to the Preliminary Adjusted Base
         Purchase Price (the "Final Adjustment"). The date on which such
         proposed settlement statement is delivered is called the "Settlement
         Statement Delivery Date." Sellers' Representative shall have the right
         for fifteen (15) days after the Settlement Statement Delivery Date to
         take exception to any proposed adjustments. The settlement statement
         shall become final and binding upon the parties on the fifteenth (15th)
         day following the Settlement Statement Delivery Date except with
         respect to matters as to which Sellers' Representative shall have given
         written notice of disagreement to Buyer on or prior to such date. If
         not resolved by Sellers' Representative and Buyers within 30 days after
         the Settlement Statement Delivery Date, all such matters shall be
         submitted for review and resolution, in accordance with Section
         2.2.2(f). The settlement statement that becomes final and binding on
         the parties either pursuant to this Section 2.2.2(d) or Section
         2.2.2(f) shall be referred to as the "Final Settlement Statement." The
         Preliminary Adjusted Base Price shall be adjusted by the Final
         Adjustment set forth in the Final Settlement Statement, and the
         Preliminary Adjusted Base Price, as adjusted by the Final Adjustment is
         referred to as the "Final Adjusted Base Price".

                  (e)      If, at the Settlement Date, the Final Adjusted Base
         Price exceeds the Preliminary Adjusted Base Price, then, within ten
         (10) days after the Settlement Date, Buyer shall pay Sellers by deposit
         into Sellers' Account the excess together with interest thereon


                                     - 13 -

<PAGE>   17



         at the Agreed Rate from the Closing Date to the date of payment. If at
         the Settlement Date, the Final Adjusted Base Price is less than the
         Preliminary Adjusted Base Price, then, within ten (10) days after the
         Settlement Date, Sellers' Representative, on behalf of all Sellers,
         shall pay Buyer the difference together with interest thereon at the
         Agreed Rate from the Closing Date to the date of payment.

                  (f)      If the Sellers' Representative and Buyer are unable 
         to agree on the settlement statement as described in Section 2.2.2(d),
         the Sellers' Representative and Buyer shall engage Deloitte & Touche or
         another nationally recognized accounting firm mutually acceptable to
         the parties (the "Accounting Firm") to resolve any disputed items and
         the Accounting Firm shall be required to render its decision within 30
         days after the dispute is referred to it. The decision of the
         Accounting Firm shall be final and binding on the parties. The fees and
         expenses of the Accounting Firm shall be paid 50% by Buyer and 50% by
         Sellers as a group.

                  2.2.3    CONTINGENT CONSIDERATION

         In addition to the Cash Consideration set forth in Section 2.2.2
hereof, Buyer shall pay Sellers by deposit into Sellers Account, and Sellers
shall be entitled to receive from Buyer, the following (collectively the
"Contingent Consideration"):

                  (a)      The Excess Gas Payment described in Exhibit B
         attached hereto and made a part hereof for all purposes,

                  (b)      Any amount required to be paid by Buyer to Sellers
         pursuant to Section 2.5;

                  (c)      All or a portion of the Remaining Royalty Holdback
         Amount to the extent required to be paid to Sellers in accordance with
         Section 2.6.2 or 2.6.3 together with any additional payments to be made
         by Buyer to Sellers pursuant to Section 2.6.2 or 2.6.3; and

                  (d)      Any amounts required to be paid by Buyer to Sellers
         pursuant to Section 2.7.

                  2.2.4    RETAINED INTEREST IN INFILL WELLS

                  (a)      In addition to the Cash Consideration and the
         Contingent Consideration described above, Sellers shall have the right
         to participate, on a well by well basis in and to any and all wells
         drilled or completed as Infill Wells in the Northeast Blanco Unit from
         and after the Closing Date for an aggregate undivided forty seven and
         one-half percent (47.5%) of the working and net revenue interests owned
         by the Company on the date hereof, or acquired by the Company in
         accordance with Section 2.6 of this Agreement, less the Devon Interest
         if Devon exercises the Devon Option as set forth in Section 2.5 (the
         "Retained Interest").

                  (b)      The procedures and conditions under which each Seller
         shall participate in each Infill Well shall be governed by the Unit
         Operating Agreement and by the


                                     - 14 -

<PAGE>   18



         provisions set forth on Exhibit C attached hereto and made a part
         hereof for all purposes (the "Infill Well Provisions"). The Infill Well
         Provisions shall apply only to the relationship between Sellers and
         Buyer with respect to Infill Wells. In the event of a conflict between
         the Unit Operating Agreement and the Infill Well Provisions, as between
         Sellers and Buyers, the Infill Well Provisions shall govern and
         control.

         2.3      CLOSING

         The purchase and sale (the "Closing") provided for in this Agreement
will take place at the offices of Sellers' counsel at 1000 Louisiana, Suite
4300, Houston, Texas at 11:00 a.m. (local time) on January 19, 1999, or at such
other time and place as Sellers' Representative and Buyer may agree. Failure to
consummate the purchase and sale provided for in this Agreement on the date and
time and at the place determined pursuant to this Section 2.3 will not result in
the termination of this Agreement and will not relieve any party of any
obligation under this Agreement. In the event Closing occurs on or after 12:00
a.m. Houston time on January 25, 1999 solely as a result of Sellers' delay, the
Cash Consideration shall be reduced by $300,000 for each week after such date
that Closing is delayed; provided, however, if Closing is delayed for less than
a full week, the Cash Consideration shall be reduced by an amount equal to
$300,000 multiplied by a fraction the numerator of which is the number of days
the Closing is delayed and the denominator of which is seven (7).

         2.4      CLOSING OBLIGATIONS

         At the Closing:

                  (a)      Sellers will deliver to Buyer

                           (i)   An assignment of the LLC Units in the form
                  attached hereto as Exhibit D executed by each of the Sellers;

                           (ii)  all of the Records of the Company;

                           (iii) full releases of liens with respect to any
                  indebtedness of the Company;

                           (iv)  opinions of counsel with respect to each Seller
                  which is an entity in a form previously reviewed by Buyer's
                  counsel; and

                           (v)   Certificates of Non-Foreign Status in the form
                  attached hereto as Exhibit E, executed by each of the Sellers.

                  (b)      Buyer will deliver:

                                 (i)  the Preliminary Adjusted Purchase Price to
                           Sellers by wire transfer to Sellers' Account; and



                                     - 15 -

<PAGE>   19



                                 (ii) an opinion of counsel with respect to
                           Buyer in a form previously reviewed by Sellers'
                           counsel.

         2.5      THE DEVON OPTION

                  (a)      Pursuant to that certain letter agreement dated July
         9, 1998 between the Company and Devon Acquisition Corporation
         ("Devon"), a copy of which is attached hereto as Exhibit F and made a
         part hereof for all purposes (the "Devon Agreement"), Devon has the
         option (the "Devon Option") to purchase from the Company an undivided
         6.7% of 19.647531% working interest and 6.7% of 16.539598% net revenue
         interest in the Northeast Blanco Unit (the "Devon Interest") owned by
         the Company if the Company, within eighteen (18) months of the date,
         the Devon Agreement (i) acquires the underlying working interests
         burdened by the Trust from Burlington and (ii) acquires the Remaining
         Royalty Interests of the Trust. The Devon Option may be exercised by
         Devon by paying to the Company 6.7% of the Acquisition Costs as defined
         in the Devon Agreement. The Company has notified Devon that the
         conditions precedent to the triggering of the Devon Option may occur,
         and Devon has indicated that it may exercise the Devon Option at such
         time.

                  (b)      If Devon timely exercises the Devon Option, and the
         amount actually paid to the Company by Devon for the Devon Interest
         exceeds the sum of (i) estimated Devon Payment set forth on the
         Preliminary Closing Statement plus (ii) costs incurred by Buyer or the
         Company after January 1, 1999 that were not included in calculating the
         estimated Devon Payment, then Buyer shall pay Sellers by deposit into
         Sellers' Account the excess within ten (10) days after Buyer's receipt
         of the Devon Payment.

                  (c)      If Devon exercises the Devon Option, and the amount
         actually paid to the Company by Devon for the Devon Interest is less
         than the estimated Devon Payment set forth on the Preliminary Closing
         Statement, then Sellers shall pay Buyer the difference (the "Devon
         Shortfall") within ten (10) days after Buyer notifies Sellers'
         Representative of the Devon Shortfall.

                  (d)      If Devon does not exercise the Devon Option, Buyer
         shall pay Sellers by deposit into Sellers' Account, within ten (10)
         days after the earlier to occur of Buyer's receipt of notice thereof or
         the expiration of the period in which Devon may exercise the Devon
         Option, an amount equal to the Devon Holdback Amount as set forth in
         Section 2.5(d) of the Disclosure Letter together with interest on the
         Devon Holdback Amount at the Agreed Rate from the Closing Date to the
         date of payment.

         2.6      PURCHASE OF REMAINING ROYALTY INTERESTS

                  2.6.1    LIQUIDATION OF THE TRUST

         The Company owns or controls the voting interest of more than sixty-six
and two-thirds percent (66 2/3%) of the issued and outstanding Trust Units and
on December 28, 1998, pursuant to a meeting duly called and noticed, voted, in
accordance with the Trust Agreement, to terminate the Trust. There remain
3,097,032 Trust Units (or 35.19354% of the issued and outstanding Trust


                                     - 16 -

<PAGE>   20



Units) which are not owned by the Company. In accordance with the Trust
Agreement, after termination of the Trust, the Remaining Royalty Interests,
constituting all of the assets of the Trust, are to be liquidated and the
proceeds distributed to the holders of the Trust Units. The Trustee is
contemporaneously conducting the liquidation process through its adviser,
Albrecht & Associates.

                  2.6.2    REQUIRED BID OF THE COMPANY

                  (a)      Buyer and Sellers hereby agree that the Company shall
         bid, pursuant to the general bid procedure conducted by the Trustee for
         the purchase of the Remaining Royalty Interests, an amount not less
         than $61,600,000 and not more than $74,800,000 for the Remaining
         Royalty Interests (the "Required Bid Amount").

                  (b)      In the event the Company is the successful bidder for
         the Required Bid Amount, such amount shall be paid by Buyer to the
         Trustee in consideration for the purchase of the Remaining Royalty
         Interests, it being agreed that if the Company is the successful
         bidder, and the Trustee requires the Company to pay the portion of the
         Required Bid Amount that would be distributed to the Company as owner
         of 5,702,968 Trust Units (the "Company's Bid Distribution") to the
         Trustee, Sellers shall pay Buyer interest on the Company's Bid
         Distribution at the Agreed Rate from the date Buyer pays the Required
         Bid Amount to the Trust through the date the Company receives the
         Special Distribution (as defined in the Trust Agreement).

                  (c)      Contemporaneously with the payment to the Trustee,
         Buyer shall pay to Sellers, by deposit to Sellers' Account, the
         Remaining Royalty Hold Back Amount together with interest thereon at
         the Agreed Rate from the Closing Date to the date of payment.

                  (d)      In the event the successful Required Bid Amount is
         between $70,400,000 and $74,800,000, no further payments shall be owing
         by Buyer to Sellers other than the payment required pursuant to Section
         2.6.2(c) hereinabove and so otherwise provided for in this Agreement.
         However, in the event the successful Required Bid Amount is less than
         $70,400,000, Buyer shall make an additional payment to Sellers, by
         deposit into the Sellers' Account, of an amount equal to fifty percent
         (50%) of the difference between $70,400,000 U.S.D. and the amount of
         the successful Required Bid Amount multiplied by 35.19354%.

                  2.6.3    PURCHASE FOR 105% OF HIGHEST ACCEPTABLE OFFER

                  (a)      If (i) the Company's Required Bid Amount is not the
         Highest Acceptable Offer for the Remaining Royalty Interests, (ii)
         Buyer elects to cause the Company to exercise its rights under Section
         9.03(e) of the Trust Agreement to purchase the Remaining Royalty
         Interests for 105% of the Highest Acceptable Offer, and (iii) such
         amount is equal to or less than $92,400,000, Buyer shall pay such
         amount to the Trustee in consideration for the purchase of the
         Remaining Royalty Interests.

                  (b)      Contemporaneously with the payment to the Trustee,
         Buyer shall pay to Sellers, by deposit to the Sellers' Account, an
         amount equal to the excess, if any, of (i) the Remaining Royalty Hold
         Back Amount over (ii) the product of (A) the actual amount paid


                                     - 17 -

<PAGE>   21



         for the Remaining Royalty Interests less $74,800,000 multiplied by (B)
         35.19354%, together with interest on such excess at the Agreed Rate
         from the Closing Date to the date of payment.


                  (c)      If the amount required to purchase the Remaining
         Royalty Interests for 105% of the Highest Acceptable Offer is greater
         than $92,400,000, Buyer shall have the option, but not the obligation,
         to pay such additional amount required in excess of the Remaining
         Royalty Hold Back Amount. Buyer may exercise this option by providing
         written notice thereof to Sellers' Representative within twenty-four
         (24) hours after receipt of notice from the Trustee of the final price
         required to purchase the Remaining Royalty Interests. If Buyer elects
         not to exercise the option described above, the Sellers' Representative
         and Buyer shall attempt to agree upon a mutually acceptable resolution
         of whether the Company shall buy the Remaining Royalty Interests and,
         if so, which party shall pay what portion of the acquisition costs. If
         Buyer elects not to exercise its option and Sellers' Representative and
         Buyer are unable to agree upon a resolution, Sellers shall have the
         option, but not the obligation, to pay to Buyer such additional amount
         required in excess of the Remaining Royalty Hold Back Amount to
         purchase the Remaining Royalty Interests. Sellers may exercise this
         option by providing written notice thereof to Buyer (together with
         payment of the additional amount to Buyer) on or before twenty-four
         (24) hours after failure of Buyer and Sellers' Representative to reach
         a mutually agreeable resolution. If Sellers exercise this option, Buyer
         shall cause the Company to purchase the Remaining Royalty Interests. If
         Sellers fail to exercise this option or deliver the additional amount
         to Buyer in a timely fashion, Buyer shall again have the option, but
         not the obligation, to pay such additional amount required in excess of
         the Remaining Royalty Hold Back Amount, which option may be exercised
         by providing written notice thereof to Sellers' Representative within
         twenty-four (24) hours after Sellers decline or fail to exercise their
         option.

                  2.6.4    SELLERS' OBLIGATION TO REPURCHASE

         In the event Buyer elects not to exercise its second option provided
for in Section 2.6.3 hereof, Buyer shall not exercise its right to purchase the
Remaining Royalty Interests for 105% of the Highest Acceptable Offer pursuant to
Section 9.03(e) of the Trust Agreement. After the sale by the Trust of the
Remaining Royalty Interests to the third party submitting the Highest Acceptable
Offer and upon receipt by the Company of the proceeds therefrom pursuant to the
final Special Distribution (as defined in the Trust Agreement), Sellers shall
repurchase from Buyer the New Mexico Properties and the South Texas Properties
for the Repurchase Amount (as hereinafter defined). Such repurchase shall be
effective as of the first day of the month following the month in which the
Special Distribution occurs (the "Trigger Date"). Contemporaneously with the
repurchase, the Contingent Consideration and the Retained Interest shall be
terminated. As used herein, the term "Repurchase Amount" shall mean the
Preliminary Adjusted Base Price adjusted as follows :

                  (a)      The Preliminary Adjusted Base Price shall be
         increased by

                           (i)   The net cash received by Sellers attributable
                  to periods beginning January 1, 1999 and ending on the Trigger
                  Date;



                                     - 18 -

<PAGE>   22



                           (ii)  a fee of Two Hundred Fifty Thousand Dollars
                  ($250,000) to reimburse Buyer for the value of the time and
                  effort incurred internally, both directly and indirectly; and

                           (iii) any capital expenditures related to the
                  Properties incurred by Buyer attributable to the period
                  beginning 1/1/99 and ending on the Trigger Date.

                  (b)      The Preliminary Adjusted Base Price shall be
         decreased by:

                           (i)   The production from the Properties for periods
                  beginning January 1, 1999 and ending on the Trigger Date
                  multiplied by $1.30/mmbtu;

                           (ii)  Any costs, including capital expenditures,
                  attributable to the periods beginning January 1, 1999 and
                  ending on the Trigger Date not paid by the Buyer; and

                           (iii) Any amount received by the Company pursuant to
                  the final Special Distribution.

                  (c)      Not later than one hundred and twenty (120) days
         after the date of the repurchase, Sellers shall prepare and deliver to
         Buyer a proposed settlement statement setting forth any required
         additional adjustments to the Repurchase Amount (the "Final Repurchase
         Adjustment"). The date on which such proposed settlement statement is
         delivered is called the "Repurchase Settlement Statement Delivery
         Date." Buyer shall have the right for fifteen (15) days after the
         Repurchase Settlement Statement Delivery Date to take exception to any
         proposed adjustments. The settlement statement shall become final and
         binding upon the parties on the fifteenth (15th) day following the
         Repurchase Settlement Statement Delivery Date except with respect to
         matters as to which Buyer shall have given written notice of
         disagreement to Sellers on or prior to such date. If not resolved by
         Sellers' Representative and Buyer within 30 days after the Repurchase
         Settlement Statement Delivery Date, all such matters shall be submitted
         for review and resolution, in accordance with Section 2.2.2(f). The
         repurchase settlement statement that becomes final and binding on the
         parties either pursuant to this Section 2.6.4(c) or Section 2.2.2(f)
         shall be referred to as the "Repurchase Final Settlement Statement."
         The Repurchase Amount shall be adjusted by the Repurchase Final
         Adjustment set forth in the Repurchase Final Settlement Statement, and
         the Repurchase Amount, as adjusted by the Final Repurchase Adjustment
         is referred to as the "Final Repurchase Amount".

         The Properties shall be conveyed to Sellers without warranty of any
kind whatsoever except a limited, by, through or under warranty of title. From
and after the date of the repurchase, (i) Buyer shall have the right to receive
and retain all proceeds of production, tax credits and other benefits, and shall
bear and pay all costs expenses and other liabilities attributable to the New
Mexico Properties and the South Texas Properties for the period commencing
January 1, 1999 and ending with the Trigger Date and (ii) Sellers shall have the
right to receive and retain all proceeds of production, tax credits and other
benefits, and shall bear and pay all costs expenses and other


                                     - 19 -

<PAGE>   23



liabilities attributable to the New Mexico Properties and the South Texas
Properties for the period commencing on the Trigger Date.

                  2.6.5 STANDSTILL. From and after the date hereof, except as
set forth in Section 2.6.3 hereof, neither Sellers nor any Related Person will
in any manner acquire, agree to acquire or make any proposal to acquire the
Remaining Royalty Interests or advise, encourage, provide assistance (including
financial assistance) or information or hold discussions with any other Person
in connection with the sale of the Remaining Royalty Interests.



3.       REPRESENTATIONS AND WARRANTIES OF SELLERS

         Sellers represent and warrant to Buyer as follows:

         3.1      ORGANIZATION AND GOOD STANDING

                  (a)      The Company is a limited liability company duly
         organized, validly existing, and in good standing under the laws of its
         jurisdiction of organization, with full corporate power and authority
         to conduct its business as it is now being conducted, to own or use the
         properties and assets that it purports to own or use, including the
         Assets, and to perform all its obligations under Applicable Contracts.
         The Company is duly qualified to do business as a foreign corporation
         and is in good standing under the laws of each state or other
         jurisdiction in which either the ownership or use of the properties
         owned or used by it, or the nature of the activities conducted by it,
         requires such qualification.

                  (b)      Sellers have delivered to Buyer true, correct and
         complete copies of the Organizational Documents of the Company, as
         currently in effect.

         3.2      AUTHORITY; NO CONFLICT

                  (a)      This Agreement constitutes the legal, valid, and
         binding obligation of Sellers, enforceable against Sellers in
         accordance with its terms. Sellers have the absolute and unrestricted
         right, power, authority, and capacity to execute and deliver, and the
         Sellers have duly executed and delivered, this Agreement and any other
         documents contemplated hereby and to perform their obligations under
         this Agreement.

                  (b)      Except as set forth in Section 3.2 of the Disclosure
         Letter, neither the execution and delivery of this Agreement nor the
         consummation or performance of any of the Contemplated Transactions
         will, directly or indirectly (with or without notice or lapse of time):

                           (i)   contravene, conflict with, or result in a
                  violation of (A) any provision of the Organizational Documents
                  of the Company, or (B) any resolution adopted by the members
                  of the Company;



                                     - 20 -

<PAGE>   24



                           (ii)  contravene, conflict with, or result in a
                  violation of, or give any Governmental Body or other Person
                  the right to challenge any of the Contemplated Transactions or
                  to exercise any remedy or obtain any relief under, any Legal
                  Requirement or any Order to which the Company or any of
                  Sellers, or any of the assets owned or used by the Company,
                  may be subject;

                           (iii) contravene, conflict with, or result in a
                  violation of any of the terms or requirements of, or give any
                  Governmental Body the right to revoke, withdraw, suspend,
                  cancel, terminate, or modify, any Governmental Authorization
                  that is held by the Company or that otherwise relates to the
                  business of, or any of the assets owned or used by, the
                  Company;

                           (iv)  cause Buyer or the Company to become subject
                  to, or to become liable for the payment of, any Taxes;

                           (v)   cause any of the assets owned by the Company to
                  be reassessed or revalued by any taxing authority or other
                  Governmental Body;

                           (vi)  contravene, conflict with, or result in a
                  violation or breach of any provision of, or give any Person
                  the right to declare a default or exercise any remedy under,
                  or to accelerate the maturity or performance of, or to cancel,
                  terminate, or modify, any Applicable Contract; or

                           (vii) result in the imposition or creation of any
                  Encumbrance upon or with respect to any of the assets owned or
                  used by the Company.

                  Except as set forth in Section 3.2 of the Disclosure Letter,
         no Seller nor the Company is or will be required to give any notice to
         or obtain any Consent from any Person in connection with the execution
         and delivery of this Agreement or the consummation or performance of
         any of the Contemplated Transactions.

         3.3      CAPITALIZATION

         The authorized equity ownership interests of the Company consist of (i)
22,587,443 Class A Units and (ii) 5,646,841 Class B Units, $1.00 par value per
unit, all of which are issued and outstanding. Such Class A and Class B Units
constitute all of the LLC Units of the Company. Sellers are and will be on the
Closing Date the record and beneficial owners and holders of all of the LLC
Units, free and clear of all Encumbrances. Each of Sellers own the number and
class of LLC Units set forth opposite such Seller's name in the chart in Exhibit
G hereto and made a part hereof for all purposes representing the percentage
ownership interest in the Company set forth opposite such Seller's name in the
chart in Exhibit A. There are no Contracts relating to the issuance, sale, or
transfer of any equity securities or other securities of the Company. None of
the LLC Units of the Company was issued in violation of the Securities Act or
any other Legal Requirement. There are not any member agreements, voting trusts
or other agreements or understandings to which any Seller is a party or by which
it is bound relating to the voting of the LLC Units that will limit in any way
the Closing of the Contemplated Transactions. The Company does not own, nor does
it have any


                                     - 21 -

<PAGE>   25



Contract to acquire, any equity securities or other securities of any Person or
any direct or indirect equity or ownership interest in any other business. The
LLC Units constitute all of the right, title and interest of Sellers or any
other Person in the Company.

         3.4      FINANCIAL STATEMENTS

         Sellers have delivered to Buyer true, correct and complete copies of
the following financial statements: (i) the unaudited balance sheets of the
Company as of December 31, 1998, and the related unaudited statements of income,
changes in members' equity, and cash flow for the fiscal year then ended,
together with the report thereon of Easley, Endres, Parkhill and Brackendorff,
P.C., independent certified public accountants, and (ii) an unaudited balance
sheet of the Company as of the Closing Date. Such financial statements and notes
fairly present the financial condition and the results of operations, changes in
members' equity, and cash flow of the Company as at the date of and for the
period referred to in such financial statements, all in accordance with GAAP.
The financial statements referred to in this Section 3.4 reflect the consistent
application of GAAP throughout the periods involved. No financial statements of
any Person other than the Company are required by GAAP to be included in the
consolidated financial statements of the Company.

         3.5      BOOKS AND RECORDS

         The books and records of the Company are complete and correct and have
been maintained in accordance with sound business practices and the requirements
of Section 13(b)(2) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), and the Texas Limited Liability Company Act, including the
maintenance of an adequate system of internal controls. The Records contain
accurate and complete records of all meetings held of, and limited liability
company action taken by, the members or managers and no meeting of any such
members or managers has been held for which minutes have not been prepared and
are not contained in the Records. At the Closing, all of the Records will be in
the possession of the Company.

         3.6      TITLE TO PROPERTIES; ENCUMBRANCES

                  (a)      The Company's interests in the Properties are such
         that, after giving effect to existing Encumbrances (i) the Company is
         entitled, during the respective lives of the Properties, to a share of
         all oil, gas and other minerals produced from each of the Properties
         which is not less than the net revenue interest described in Section
         3.6(a) of the Disclosure Letter for such Properties except with respect
         to any changes in such interests which may result from the expansion or
         contraction of any applicable units pursuant to the terms of the Unit
         Agreement, the Unit Operating Agreement or applicable statutes, rules
         or regulations, (ii) the Company owns an undivided interest equal to
         the working interest described in Section 3.6 of the Disclosure Letter
         in and to all property and rights incident such working interest
         including all rights in, to and under all agreements, leases permits
         and easements, licenses and orders in any way relating thereto, and in
         and to all wells, personal property, fixtures and improvements thereon,
         appurtenant thereto or used or obtained in connection therewith or with
         the production or treatment or sale or disposal of hydrocarbons or
         water produced therefrom or attributable thereto, (iii) the Company is
         obligated, during the respective lives of the Properties, for a
         fraction of the costs relating to the exploration,


                                     - 22 -

<PAGE>   26



         development, operation and maintenance of each of the Properties no
         greater than the working interest described in Section 3.6(a) of the
         Disclosure Letter without a proportionate increase in the net revenue
         interest attributable thereto except with respect to any changes in
         such interests which may result from the expansion or contraction of
         any applicable units pursuant to the terms of the Unit Agreement, the
         Unit Operating Agreement or applicable statutes, rules or regulations,.

                  (b)      Neither the Sellers nor the Company has ever been
         advised by any lessor under any of the leases, nor by the operator of
         the Properties of a breach or default, which claim of breach or default
         has not been resolved.

                  (c)      Except as set forth in Section 3.6(c) of the
         Disclosure Letter, the Properties are not subject to any Encumbrance
         except (i) imperfections of title, if any, as do not materially detract
         from the value or interfere with the use of the Properties for the
         purposes for which they are presently used or otherwise materially
         impair the business operations of the Company, (ii) liens for taxes and
         general and special assessments not in default and payable without
         penalty or interest, (iii) liens which have not materialized that are
         created by or arise under contracts for the sale, purchase, exchange or
         processing of hydrocarbons, (iv) liens which have not materialized that
         are created by or arise under any operating agreement, pipeline,
         gathering or transportation agreement or other agreement pursuant to
         which the Properties are otherwise subject, and (v) easements,
         rights-of-way, servitudes, permits, surface leases and other
         conditions, restrictions or rights in respect of surface operations,
         timber leases, pipelines, roads, highways railways, power lines,
         grazing, logging, canals ditches, and the like on, over or in respect
         of any of such interests for the purposes for which they are presently
         used (collectively together with the items set forth in Section 3.6(c)
         of the Disclosure Letter, the "Permitted Encumbrances").

         3.7      NO UNDISCLOSED LIABILITIES

         Except as set forth in Section 3.7 of the Disclosure Letter, to the
Knowledge of Sellers, as of the date hereof, there is not and has not been any
event or occurrence (or lack of event or occurrence) which, with notice or the
passage of time or both, would give rise to liabilities or obligations of any
nature (whether known or unknown and whether absolute, accrued, contingent, or
otherwise) of the Company, and the consummation or performance of the
Contemplated Transactions will not create any such liabilities or obligations.

         3.8      TAXES

                  (a)      The Company has filed or caused to be filed (on a
         timely basis since its inception) all Tax Returns that are or were
         required to be filed by or with respect to it pursuant to applicable
         Legal Requirements and the members will (on a timely basis) report
         their allocable share of the Company's income, gain, loss, deduction
         and credits to be reported on any such Tax Returns and will cause to be
         paid all Taxes shown to be due on their individual Tax Returns for the
         relevant periods. The Company has paid, or made provision for the
         payment of, all Taxes that have or may have become due pursuant to
         those Tax Returns or otherwise, or pursuant to any assessment received
         by Sellers or the Company.


                                     - 23 -

<PAGE>   27



                  (b)      The charges, accruals, and reserves with respect to
         Taxes on the respective books of the Company are adequate (determined
         in accordance with GAAP) and are at least equal to the Company's
         liability for Taxes. There exists no proposed tax assessment against
         the Company. All Taxes that the Company is or was required by Legal
         Requirements to withhold or collect have been duly withheld or
         collected and, to the extent required, have been paid to the proper
         Governmental Body or other Person.

                  (c)      There is no tax sharing agreement that will require
         any payment by the Company after the date of this Agreement.

         3.9      NO MATERIAL ADVERSE CHANGE

         Since January 1, 1999, there has not been any material adverse change
in the business, operations, properties, prospects, assets, or condition of the
Company, and no event has occurred or circumstance exists that may result in
such a material adverse change.

         3.10     EMPLOYEES

         The Company has no employees nor has it ever had any employees.

         3.11     COMPLIANCE WITH LEGAL REQUIREMENTS; GOVERNMENTAL
                  AUTHORIZATIONS

                  (a)      Except as set forth in Section 3.11 of the Disclosure
         Letter:

                           (i)   the Company is, and at all times since the date
                  of its formation, has been, in full compliance with each Legal
                  Requirement that is or was applicable to it or to the conduct
                  or operation of its business or the ownership or use of any of
                  its assets;

                           (ii)  no event has occurred or circumstance exists
                  that (with or without notice or lapse of time) (A) may
                  constitute or result in a violation by the Company of, or a
                  failure on the part of the Company to comply with, any Legal
                  Requirement, or (B) to the Knowledge of Sellers, may give rise
                  to any obligation on the part of the Company to undertake, or
                  to bear all or any portion of the cost of, any remedial action
                  of any nature; and

                           (iii) the Company has not received, at any time since
                  the date of its formation, any notice or other communication
                  (whether oral or written) from any Governmental Body or any
                  other Person regarding (A) any actual, alleged, possible, or
                  potential violation of, or failure to comply with, any Legal
                  Requirement, or (B) any actual, alleged, possible, or
                  potential obligation of the Company to undertake, or to bear
                  all or any portion of the cost of, any remedial action of any
                  nature.

                  (b)      Section 3.11 of the Disclosure Letter contains a
         complete and accurate list of each Governmental Authorization that is
         held by the Company or that otherwise relates to


                                     - 24 -

<PAGE>   28



         the business of, or to any of the assets owned or used by, the Company.
         Each Governmental Authorization listed or required to be listed in
         Section 3.11 of the Disclosure Letter is valid and in full force and
         effect. Except as set forth in Section 3.11 of the Disclosure Letter:

                           (i)   the Company is, and at all times since the date
                  of its formation, has been, in full compliance with all of the
                  terms and requirements of each Governmental Authorization
                  identified or required to be identified in Section 3.11 of the
                  Disclosure Letter;

                           (ii)  no event has occurred or circumstance exists
                  that may (with or without notice or lapse of time) (A)
                  constitute or result directly or indirectly in a violation of
                  or a failure to comply with any term or requirement of any
                  Governmental Authorization listed or required to be listed in
                  Section 3.11 of the Disclosure Letter, or (B) result directly
                  or indirectly in the revocation, withdrawal, suspension,
                  cancellation, or termination of, or any modification to, any
                  Governmental Authorization listed or required to be listed in
                  Section 3.11 of the Disclosure Letter;

                           (iii) the Company has not received, at any time since
                  the date of its formation, any notice or other communication
                  (whether oral or written) from any Governmental Body or any
                  other Person regarding (A) any actual, alleged, possible, or
                  potential violation of or failure to comply with any term or
                  requirement of any Governmental Authorization, or (B) any
                  actual, proposed, possible, or potential revocation,
                  withdrawal, suspension, cancellation, termination of, or
                  modification to any Governmental Authorization; and

                           (iv)  all applications required to have been filed
                  for the renewal of the Governmental Authorizations listed or
                  required to be listed in Section 3.11 of the Disclosure Letter
                  have been duly filed on a timely basis with the appropriate
                  Governmental Bodies, and all other filings required to have
                  been made with respect to such Governmental Authorizations
                  have been duly made on a timely basis with the appropriate
                  Governmental Bodies.

The Governmental Authorizations listed in Section 3.11 of the Disclosure Letter
collectively constitute all of the Governmental Authorizations necessary to
permit the Company to lawfully conduct and operate its business in the manner it
currently conducts and operates such business and to permit the Company to own
and use its assets, including the Assets, in the manner in which it currently
owns and uses such assets.

         3.12     LEGAL PROCEEDINGS; ORDERS

                  (a)      Except as set forth in Section 3.12(a) of the
         Disclosure Letter, there is no pending Proceeding:

                           (i)   that has been commenced by or against the
                  Company or that otherwise relates to or may materially,
                  adversely affect the business of, or any of the assets owned
                  or used by, the Company; or


                                     - 25 -

<PAGE>   29



                           (ii)  that challenges, or that may have the effect of
                  preventing, delaying, making illegal, or otherwise interfering
                  with, any of the Contemplated Transactions.

         To the Knowledge of Sellers, (1) no such Proceeding has been
         Threatened, and (2) no event has occurred or circumstance exists that
         may give rise to or serve as a basis for the commencement of any such
         Proceeding. Sellers have delivered to Buyer copies of all pleadings,
         correspondence, and other documents relating to each Proceeding listed
         in Section 3.12(a) of the Disclosure Letter. The Proceedings listed in
         Section 3.12(a) of the Disclosure Letter will not have a material
         adverse effect on the business, operations, assets, condition, or
         prospects of the Company.

                  (b)      Except as set forth in Section 3.12(b) of the
         Disclosure Letter:

                           (i)   there is no Order to which the Company, or any 
                  of the assets owned or used by the Company, is subject; and

                           (ii)  none of Sellers is subject to any Order that
                  relates to the business of, or any of the assets owned or used
                  by, the Company.

         3.13     ABSENCE OF CERTAIN CHANGES AND EVENTS

         Except as set forth in Section 3.13 of the Disclosure Letter, since its
inception, the Company has conducted its business only in the Ordinary Course of
Business and there has not been any:

                  (a)      change in the Company's authorized or issued units;
         grant of any option or right to purchase units of the Company; issuance
         of any security convertible into such units or membership interests;
         grant of any registration rights; purchase, redemption, retirement, or
         other acquisition by the Company of any units or membership interests
         of the Company; or declaration or payment of any dividend or other
         distribution or payment in respect of units;

                  (b)      amendment to the Organizational Documents of the
         Company;

                  (c)      payment or increase by the Company of any bonuses,
         salaries, or other compensation to any stockholder, director, officer,
         member, manager, or employee or entry into any employment, severance,
         or similar Contract with any of the foregoing;

                  (d)      damage to or destruction or loss of any asset or
         property of the Company, whether or not covered by insurance,
         materially and adversely affecting the properties, assets, business,
         financial condition, or prospects of the Company, taken as a whole;

                  (e)      except the Gas Contract (as defined in the Burlington
         Purchase Agreement) that was terminated in connection with the
         termination of the Trust, or as disclosed in Section 3.13(e) of the
         Disclosure Letter, entry into of any Contract or transaction that
         continues after the Closing or, termination of, or receipt of notice of
         termination of any Contract or transaction which would have continued
         after the Closing, but for such termination;


                                     - 26 -

<PAGE>   30



                  (f)      sale, lease, or other disposition of any asset or
         property of the Company or mortgage, pledge, or imposition of any lien
         or other encumbrance on any material asset or property of the Company;

                  (g)      except to the extent canceled or waived in connection
         with the closing of the transactions described in the Burlington
         Purchase Agreement and in connection with the termination of the Trust,
         cancellation or waiver of any claims or rights which would otherwise
         continue after the Closing;

                  (h)      material change in the accounting methods used by the
         Company;

                  (i)      any election not to participate in any operation
         proposed to be conducted with respect to the Assets; or

                  (j)      agreement, whether oral or written, by the Company to
         do any of the foregoing.

         3.14     CONTRACTS; NO DEFAULTS

                  (a)      Section 3.14(a) of the Disclosure Letter contains a
         complete and accurate list, and Sellers have delivered to Buyer true
         and complete copies, of each Applicable Contract whether for
         performance of services, delivery of goods or materials, capital
         expenditures or otherwise, which will be binding on the Company after
         the Closing.

                  (b)      Except as set forth in Section 3.14 of the Disclosure
         Letter, each Contract identified or required to be identified in
         Section 3.14 of the Disclosure Letter is in full force and effect and
         is valid and enforceable in accordance with its terms.

                  (c)      Except as set forth in Section 3.14 of the Disclosure
         Letter:

                           (i)   the Company is, and at all times since the date
                  of its formation has been, in full compliance with all
                  applicable terms and requirements of each Contract under which
                  the Company has or had any obligation or liability or by which
                  the Company or any of the assets owned or used by the Company
                  is or was bound;

                           (ii)  each other Person that has or had any
                  obligation or liability under any Contract under which the
                  Company has or had any rights is, and at all times since the
                  date of its formation has been, in full compliance with all
                  applicable terms and requirements of such Contract;

                           (iii) no event has occurred or circumstance exists
                  that (with or without notice or lapse of time) may contravene,
                  conflict with, or result in a violation or breach of, or give
                  the Company or other Person the right to declare a default or
                  exercise any remedy under, or to accelerate the maturity or
                  performance of, or to cancel, terminate, or modify, any
                  Applicable Contract; and



                                     - 27 -

<PAGE>   31



                           (iv)  the Company has not given to or received from
                  any other Person, at any time since the date of its formation,
                  any notice or other communication (whether oral or written)
                  regarding any actual, alleged, possible, or potential
                  violation or breach of, or default under, any Contract.

                  (d)      There are no renegotiations of, attempts to
         renegotiate, or outstanding rights to renegotiate any amounts paid or
         payable to the Company under current or completed Contracts with any
         Person and, to the Knowledge of Sellers and the Company, no such Person
         has made written demand for such renegotiation.

         3.15     INSURANCE

                  (a)      Sellers have delivered to Buyer:

                           (i)   true and complete copies of all policies of
                  insurance to which the Company is a party or under which the
                  Company, or any manager or member of the Company, is or has
                  been covered at any time within the one year preceding the
                  date of this Agreement;

                           (ii)  true and complete copies of all pending 
                  applications for policies of insurance; and

                           (iii) any statement by the auditor of the Company's
                  financial statements with regard to the adequacy of such
                  entity's coverage or of the reserves for claims.

                  (b)      Except as set forth on Section 3.15 of the Disclosure
         Letter:

                           (i)   All policies to which the Company is a party or
                  that provide coverage to either Sellers, the Company, or any
                  manager or member of the Company:

                                 (A)  are valid, outstanding, and enforceable;

                                 (B)  are issued by an insurer that is 
                           financially sound and reputable;

                                 (C)  taken together, provide adequate insurance
                           coverage for the assets and the operations of the
                           Company for all risks normally insured against by a
                           Person carrying on the same business or businesses as
                           the Company;

                                 (D)  are sufficient for compliance with all
                           Legal Requirements and Contracts to which the Company
                           is a party or by which it is bound;

                                 (E)  will continue in full force and effect
                           following the consummation of the Contemplated
                           Transactions; and



                                     - 28 -

<PAGE>   32



                                 (F)  do not provide for any retrospective
                           premium adjustment or other experienced-based
                           liability on the part of the Company.

                           (ii)  None of the Sellers or the Company has received
                  (A) any refusal of coverage or any notice that a defense will
                  be afforded with reservation of rights, or (B) any notice of
                  cancellation or any other indication that any insurance policy
                  is no longer in full force or effect or will not be renewed or
                  that the issuer of any policy is not willing or able to
                  perform its obligations thereunder.

                           (iii) The Company has paid all premiums due, and has
                  otherwise performed all of its obligations, under each policy
                  to which the Company is a party or that provides coverage to
                  the Company or managers thereof.

                           (iv) The Company has given notice to the insurer of
                  all claims that may be insured thereby.

         3.16     ENVIRONMENTAL MATTERS

         Except as set forth in Section 3.16 of the Disclosure Letter:

                  (a)      The Company is, and at all times has been, in full
         compliance with, and has not been and is not in violation of or liable
         under, any Environmental Law. None of the Sellers or the Company has
         any basis to expect, nor has any of them, or, to the Knowledge of
         Sellers or the Company, any other Person for whose conduct they are or
         may be held to be responsible received, any actual or Threatened order,
         notice, or other communication from any Governmental Body or private
         citizen acting in the public interest, of any actual or potential
         violation or failure to comply with any Environmental Law, or of any
         actual or Threatened obligation to undertake or bear the cost of any
         Environmental, Health, and Safety Liabilities with respect to any of
         the Assets or any other properties or assets (whether real, personal,
         or mixed) in which Sellers or the Company has had an interest, or with
         respect to any property or facility at or to which Hazardous Materials
         were generated, manufactured, refined, transferred, imported, used, or
         processed by Sellers, the Company, or any other Person for whose
         conduct they are or may be held responsible, or from which Hazardous
         Materials have been transported, treated, stored, handled, transferred,
         disposed, recycled, or received.

                  (b)      There are no pending or, to the Knowledge of Sellers
         or the Company, Threatened claims, Encumbrances, or other restrictions
         of any nature, resulting from any Environmental, Health, and Safety
         Liabilities or arising under or pursuant to any Environmental Law, with
         respect to or affecting any of the properties and assets (whether real,
         personal, or mixed) in which Sellers or the Company has or had an
         interest.

                  (c)      None of the Sellers nor the Company has Knowledge of
         any basis to expect, nor has any of them or any other Person for whose
         conduct they are or may be held responsible, received any citation,
         directive, inquiry, notice, Order, summons, warning, or other
         communication that relates to Hazardous Activity, Hazardous Materials,
         or any alleged,


                                     - 29 -

<PAGE>   33



         actual, or potential violation or failure to comply with any
         Environmental Law, or of any alleged, actual, or potential obligation
         to undertake or bear the cost of any Environmental, Health, and Safety
         Liabilities with respect to any of the properties or assets (whether
         real, personal, or mixed) in which Sellers or the Company has an
         interest, or with respect to any property or facility to which
         Hazardous Materials generated, manufactured, refined, transferred,
         imported, used, or processed by Sellers, the Company, or any other
         Person for whose conduct they are or may be held responsible, have been
         transported, treated, stored, handled, transferred, disposed, recycled,
         or received.

                  (d)      None of the Sellers nor the Company, nor, to the
         Knowledge of Sellers and the Company, any other Person for whose
         conduct they are or may be held responsible, has any Environmental,
         Health, and Safety Liabilities with respect to the properties and
         assets (whether real, personal, or mixed) in which Sellers or the
         Company (or any predecessor), has or had an interest, or at any
         property geologically or hydrologically adjoining any such property or
         assets.

                  (e)      Sellers have delivered to Buyer true and complete
         copies and results of any reports, studies, analyses, tests, or
         monitoring possessed or initiated by Sellers or the Company pertaining
         to Hazardous Materials or Hazardous Activities in, on, or under the
         properties or assets owned by the Company, or concerning compliance by
         Sellers, the Company, or any other Person for whose conduct they are or
         may be held responsible, with Environmental Laws, including the
         Environmental Assessment.

         3.17     DISCLOSURE

                  (a)      No representation or warranty of Sellers in this
         Agreement, no statement in the Disclosure Letter, and no information
         provided to Buyer by Sellers, the Company or, to the Knowledge of
         Sellers and the Company, their Representatives contains any untrue
         statement of a material fact or omits to state a material fact
         necessary to make the statements herein or therein, in light of the
         circumstances in which they were made, not misleading.

                  (b)      There is no fact known to any of the Sellers that has
         specific application to any of the Sellers or the Company (other than
         general economic or industry conditions) and that, as far as any Seller
         can reasonably foresee, materially threatens, the assets, business,
         prospects, financial condition, or results of operations of the Company
         that has not been set forth in this Agreement or the Disclosure Letter.

         3.18     AFFILIATE CONTRACTS

         Except as set forth in Section 3.18 of the Disclosure Letter, none of
the Sellers or any Related Person of Sellers or of the Company is a party to any
Contract with, or has any claim or right against, the Company.





                                     - 30 -

<PAGE>   34

         3.19     BROKERS OR FINDERS

         Except with respect to those fees provided for in that certain letter
agreement between the Company and Bowles Hollowell Conner & Co. agreed to and
accepted by the Company on January 7, 1999 (the "Broker Letter"), Sellers and
their agents have incurred no obligation or liability, contingent or otherwise,
for brokerage or finders' fees or agents' commissions or other similar payment
in connection with this Agreement. All fees provided for in the Broker Letter
shall be the sole obligation and responsibility of Sellers.

         3.20     SECTION 29 TAX CREDIT WELLS

         To the Knowledge of Sellers, except as set forth in Section 3.20 of the
Disclosure Letter, all production from each well included in the New Mexico
Properties qualifies for the federal income tax credit set forth in Section 29
of the IRC.

         3.21     CERTAIN PRODUCTION MATTERS

                  (a)      The Company has not received, and neither the Company
         nor any of the Sellers have Knowledge of any operator receiving, any
         claim, notice or order from any Governmental Body due to hydrocarbon
         production from the Properties being in excess of allowables or similar
         violations which could result in curtailment of hydrocarbon production
         from the Properties after Closing.

                  (b)      The Company is not obligated, by virtue of a "take or
         pay" or other prepayment arrangement, a production payment, or any
         other Contract, to deliver any volume of hydrocarbons, or permit any
         other person to take any volume of hydrocarbons, produced from or
         attributable to the Properties at any time without receiving full
         payment therefor.

                  (c)      Except as set forth in Section 3.21(c) of the
         Disclosure Letter, as of January 1, 1999 and as of the Closing Date,
         there were no outstanding authority for expenditures or other
         commitments to make capital expenditures which were binding on the
         Properties or the Company.

                  (d)      The Company has not received any notice that any
         Governmental Body or Person intends or seeks to reform, amend, cancel,
         restate or terminate or alter the Unit Agreement or the Unit Operating
         Agreement and has no reason to believe any Governmental Body or Person
         intends or seeks to do so.

         3.22     SEC FILINGS

         The Company and Sellers have filed all statements, forms, reports and
other documents with the SEC required to be filed pursuant to the Securities Act
or the Exchange Act since the Company's formation (collectively, the "SEC
Documents"). The SEC Documents, as of their respective filing dates, complied as
to form in all material respects with all applicable Legal Requirements and did
not contain any untrue statement of a material fact or omit to state a material
fact required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading.



                                     - 31 -

<PAGE>   35



         3.23     BURLINGTON PURCHASE AGREEMENT

         Other than as set forth in Section 3.23 of the Disclosure Letter, there
are no contracts, agreements or other understandings between the Company and
Burlington which would affect the Company's ability to seek indemnity from
Burlington under the Burlington Purchase Agreement for any matter thereunder for
which Burlington is obligated to indemnify the Company. To Sellers' Knowledge,
the representations and warranties made by Burlington under the Burlington
Purchase Agreement were true and correct at the closing of the acquisition
contemplated thereunder and remain true and correct as of the Closing Date.

4.       REPRESENTATIONS AND WARRANTIES OF BUYER

         Buyer represents and warrants to Sellers as follows:

         4.1      ORGANIZATION AND GOOD STANDING

         Buyer is a corporation duly organized, validly existing, and in good
standing under the laws of the Commonwealth of Virginia, and has full corporate
power and authority to own its properties and carry on its business as it is now
being conducted.

         4.2      AUTHORITY; NO CONFLICT

                  (a)      This Agreement has been duly executed and delivered
         by Buyer and constitutes the legal, valid, and binding obligation of
         Buyer, enforceable against Buyer in accordance with its terms. Buyer
         has the absolute and unrestricted right, power, and authority to
         execute and deliver this Agreement and to perform its obligations under
         this Agreement.

                  (b)      Neither the execution and delivery of this Agreement
         nor the consummation or performance of any of the Contemplated
         Transactions will (with the giving of notice or the passage of time or
         both) give any Person the right to prevent, delay, or otherwise
         interfere with any of the Contemplated Transactions pursuant to:

                           (i)   any provision of Buyer's Organizational
                  Documents;

                           (ii)  any resolution adopted by the board of 
                  directors or the stockholders of Buyer;

                           (iii) any Legal Requirement or Order to which Buyer
                  may be subject; or

                           (iv)  any Contract to which Buyer is a party or by
                  which Buyer may be bound.

         Buyer is not and will not be required to obtain any Consent from any
         Person in connection with the execution and delivery of this Agreement
         or the consummation or performance of any of the Contemplated
         Transactions, except for consents already obtained.



                                     - 32 -

<PAGE>   36



         4.3      INVESTMENT INTENT

         Buyer is acquiring the LLC Units for its own account and not with a
view to their distribution within the meaning of Section 2(11) of the Securities
Act.

         4.4      CERTAIN PROCEEDINGS

         There is no pending Proceeding that has been commenced against Buyer
and that challenges, or may have the effect of preventing, delaying, making
illegal, or otherwise interfering with, any of the Contemplated Transactions. To
Buyer's Knowledge, no such Proceeding has been Threatened.

         4.5      BROKERS OR FINDERS

         Buyer and its officers and agents have incurred no obligation or
liability, contingent or otherwise, for brokerage or finders' fees or agents'
commissions or other similar payment in connection with this Agreement and will
indemnify and hold Sellers harmless from any such payment alleged to be due by
or through Buyer as a result of the action of Buyer or its officers or agents.

         4.6      FINANCING

         Buyer now has and, on the Closing Date and on each subsequent date on
which a payment is required to be made by Buyer pursuant to the terms of this
Agreement, will have sufficient funds available to pay the Cash Consideration
and the Contingent Consideration.

         4.7      ACKNOWLEDGMENTS

                  (a)      Except as and to the extent specifically set forth in
         this Agreement, Buyer acknowledges and agrees that the Sellers make no
         representations or warranties whatsoever, and except as specifically
         set forth herein, that Sellers disclaim all liability and
         responsibility for any representation, warranty, statement or
         information made or communicated (orally or in writing) to Buyer or to
         Buyer's Representatives (including, without limitation, any opinion,
         information or advice which may have been provided to Buyer by any
         Representative of Sellers or any of them). Without limiting the
         generality of the foregoing, Buyer acknowledges and agrees that Sellers
         make no representations or warranties as to (i) the amount of
         petroleum, gas, condensate, or other reserves attributable to any
         properties of the Company or (ii) any geological, geophysical,
         engineering, economic, or other interpretations, forecasts, or
         evaluations.

                  (b)     In determining to acquire the LLC Units, Buyer has
         made its own investigation, analysis, and evaluation of the Assets of
         the Company (including, without limitation, visual onsite inspection of
         the surface of such properties and assets), and based thereon and on
         the representations, warranties, covenants and agreements made by
         Sellers in this Agreement, Buyer has formed an independent judgment
         concerning the Company and its Assets (including its own estimate and
         appraisal of the extent and value of its petroleum


                                     - 33 -

<PAGE>   37



         and gas reserves), results of operations and prospects and the inherent
         risks associated with owning and operating said Assets.

                  (c)      Except for the representations, warranties, covenants
         and indemnities made in this Agreement or in any document delivered
         pursuant to this Agreement by Sellers, the Assets of the Company are
         accepted by Buyer "AS IS" and "WHERE IS".

5.       INDEMNIFICATION; REMEDIES

         5.1      SURVIVAL; RIGHT TO INDEMNIFICATION NOT AFFECTED BY
                  KNOWLEDGE

         All representations, warranties, covenants, and obligations in this
Agreement, the Disclosure Letter, and any other certificate or document
delivered pursuant to this Agreement will survive the Closing to the extent set
forth in this Article 5. The waiver of any condition based on the accuracy of
any representation or warranty, or on the performance of or compliance with any
covenant or obligation, will not affect the right to indemnification, payment of
Damages, or other remedy based on such representations, warranties, covenants,
and obligations.

         5.2      INDEMNIFICATION AND PAYMENT OF DAMAGES BY SELLERS

         Subject to the provisions of Section 5.4 hereof, each of the Sellers
will indemnify and hold harmless Buyer, the Company, and their respective
Representatives, unitholders, controlling persons, and affiliates (collectively,
the "Indemnified Persons") for, and will pay to the Indemnified Persons the
amount of, any loss, liability, claim, damage (including incidental and
consequential damages), expense (including costs of investigation and defense
and reasonable attorneys' fees) or diminution of value, whether or not involving
a third-party claim (collectively, "Damages"), arising, directly or indirectly,
from or in connection with:

                  (a)      any Breach of any representation or warranty made by
         Sellers in this Agreement, the Disclosure Letter, or any other
         certificate or document delivered by Sellers pursuant to this
         Agreement;

                  (b)      any Breach by any of the Sellers of any covenant or 
         obligation of such Seller in this Agreement;

                  (c)      any claim by any Person for brokerage or finder's
         fees or commissions or similar payments based upon any agreement or
         understanding alleged to have been made by any such Person with any of
         the Sellers or the Company (or any Person acting on their behalf) in
         connection with any of the Contemplated Transactions;

                  (d)      the Company's or any Seller's failure to pay any
         Taxes that are imposed on the Company or Sellers for the periods prior
         to January 1, 1999;

                  (e)      any claim by any Person with respect to any act or
         omission of the Company or Sellers with regard to the Company prior to
         January 1, 1999;


                                     - 34 -

<PAGE>   38



                  (f)      subject to the limitations of Section 5.4(d) hereof,
         the failure of gas delivered under the Gathering Agreement to conform
         to the CO2 specification set forth therein. In the event Buyer receives
         notice that its gas will be shut-in pursuant to Section 4.2 of the
         Gathering Agreement solely as a result of BRGI (as defined in the
         Gathering Agreement) electing to exercise its rights under Article 4.2
         of Appendix A to the Gathering Agreement for high CO2 content and not
         as a result of any force majeure event, Buyer shall provide written
         notice to Sellers thereof no later than forty-eight (48) hours after
         receipt of notification from BRGI under the Gathering Agreement. Buyer
         and Sellers shall jointly cooperate with one another to find a mutually
         acceptable resolution to BRGI's refusal to accept the gas as a result
         of high CO2 content that will minimize Sellers' liability under this
         indemnity provision. Buyer shall take no action with respect thereto
         without Sellers having adequate opportunity to exercise its rights
         under Section 5.4(d) hereof; provided, however, if Sellers are unable
         to timely provide an alternative pursuant to section 5.4(d), Buyer
         shall have the right to enter into another agreement with a third
         Person giving due regard to minimizing Sellers obligations under this
         indemnity provision.

The remedies provided in this Section 5.2 will not be exclusive of or limit any
other remedies that may be available to Buyer or the other Indemnified Persons;
provided, however, the limitations set forth in Section 5.4 hereof shall limit
all liabilities of Sellers to Buyer or any Indemnified Person under this
Agreement, the Disclosure Letter or any other certificate or document delivered
to Sellers pursuant to this Agreement.

         5.3      INDEMNIFICATION AND PAYMENT OF DAMAGES BY BUYER

         Buyer will indemnify and hold harmless Sellers, and will pay to Sellers
the amount of any Damages arising, directly or indirectly, from or in connection
with (a) any Breach of any representation or warranty made by Buyer in this
Agreement or in any certificate or document delivered by Buyer pursuant to this
Agreement, (b) any Breach by Buyer of any covenant or obligation of Buyer in
this Agreement, or (c) any claim by any Person for brokerage or finder's fees or
commissions or similar payments based upon any agreement or understanding
alleged to have been made by such Person with Buyer (or any Person acting on its
behalf) in connection with any of the Contemplated Transactions, or (d) any
claim by any Person with respect to any act or omission of the Company or Buyer
on or after the Closing Date.

         5.4      LIMITATIONS ON SELLERS' LIABILITY

                  (a)      Notwithstanding anything else to the contrary
         contained herein, Sellers shall have no liability (for indemnification
         or otherwise) with respect to any representation or warranty, or
         covenant or obligation to be performed and complied with under the
         terms of this Agreement, other than those set forth in Sections 3.7
         (only to the extent same are not covered by another representation or
         warranty set forth in Article 3 hereof), 3.8, 3.20, 3.23, 5.2(d) and
         5.2(f) unless on or before the first anniversary of the date hereof,
         Buyer notifies Sellers of a claim specifying the factual basis of that
         claim in reasonable detail to the extent then known by Buyer. Sellers
         shall have no liability (for indemnification or otherwise) with respect
         to claims made with respect to matters covered by Section 3.7 which are
         not also covered by another representation or warranty set forth in
         Article 3 hereof and Sections 3.8,


                                     - 35 -

<PAGE>   39



         3.20, 3.23 and 5.2(d) unless on or before the fifth anniversary of the
         date hereof, Buyer notifies Sellers of a claim specifying the factual
         basis of that claim in reasonable detail to the extent then known by
         Buyer. Unless sooner terminated pursuant to Section 5.4(d) hereof,
         Sellers shall have no liability (for indemnification or otherwise) with
         respect to claims made with respect to matters covered by Section
         5.2(f) unless on or before the stated expiration date of the Gathering
         Agreement (not taking into account any amendment thereto subsequent to
         the date hereof which would extend the termination date thereof, i.e.
         December 31, 2007), Buyer notifies Sellers of a claim thereunder
         specifying the factual basis of that claim in reasonable detail to the
         extent then know by Buyer. Sellers shall have no liability whatsoever
         to Buyer or any other Person under the terms of this Agreement from and
         after such stated expiration date of the Gathering Agreement except as
         set forth in Section 5.4(e) hereof.

                  (b)      Sellers' aggregate liability to Indemnified Persons
         under this Agreement shall not exceed $28,000,000 for claims for which
         notice is received from Buyer during the one (1) year period
         immediately following the date hereof; provided, however, that with
         respect to claims for which notice is first received after the first
         anniversary of the date hereof, Sellers' aggregate liability to
         Indemnified Persons under this Agreement shall not exceed $10,000,000
         with respect to such claims.

                  (c)      Sellers liability to Indemnified Persons under this
         Article 5 shall be joint and several only with respect to the first
         $10,000,000 of liability during the one year period from and after the
         date hereof. All liability of Sellers under this Agreement in excess of
         $10,000,000 or for which notice is provided to Sellers after the one
         year anniversary hereof shall be borne by Sellers severally and
         individually, but not jointly, such that each Seller shall only be
         liable and responsible for such Seller's pro rata share, as set forth
         in Section 5.4(c) of the Disclosure Letter, of any Damages arising
         hereunder in excess of $10,000,000 or for which notice is given after
         the one year anniversary hereof.

                  (d)      Sellers's indemnification obligations pursuant to
         Section 5.2(f) hereof shall terminate upon delivery to Buyer of one of
         the following:

                           (1)   An amendment to the Gathering Agreement
                  acceptable to Buyer that eliminates the rights of BRGI (as
                  defined in the Gathering Agreement) thereunder to refuse gas
                  if the CO2 content of the gas is less than 20% and otherwise
                  upon the same terms and conditions as currently contained in
                  the Gathering Agreement;

                           (2)   A second or backup gathering agreement
                  acceptable to Buyer upon substantially similar terms and
                  conditions as the Gathering Agreement with a third Person
                  other than BRGI that would become effective upon the
                  termination of the Gathering Agreement as to certain receipt
                  points, cover any period of time that Buyer is shut-in under
                  the Gathering Agreement due to excess CO2 content and allows
                  such back-up Person to refuse the gas for excess CO2 only when
                  and to the extent such CO2 exceeds 20%; or



                                     - 36 -

<PAGE>   40



                           (3)   Any other enforceable arrangement that is
                  reasonably acceptable to Buyer and eliminates Buyer's risk
                  with respect to the treatment of gas up to a CO2 content of
                  20%.

         (e)      With respect to any liabilities arising from or related to any
actions or inactions by a Seller which are finally determined in a court of
competent jurisdiction to be intentional misrepresentation or fraud, the
limitations set forth in Sections 5.4(a), (b) and (c) hereof shall not apply and
there shall be no limitation on such Seller's liabilities hereunder arising
therefrom or related thereto.

         5.5      PROCEDURE FOR INDEMNIFICATION--THIRD PARTY CLAIMS

                  (a)      Promptly after receipt by an indemnified party under
         Section 5.2 or 5.3 of notice of the commencement of any Proceeding
         against it, such indemnified party will, if a claim is to be made
         against an indemnifying party under such Section, give notice to the
         indemnifying party of the commencement of such claim, but the failure
         to notify the indemnifying party will not relieve the indemnifying
         party of any liability that it may have to any indemnified party,
         except to the extent that the indemnifying party demonstrates that the
         defense of such action is prejudiced by the indemnifying party's
         failure to give such notice.

                  (b)      If any Proceeding referred to in Section 5 is brought
         against an indemnified party and it gives notice to the indemnifying
         party of the commencement of such Proceeding, the indemnifying party
         will, unless the claim involves Taxes, be entitled to participate in
         such Proceeding and, to the extent that it wishes (unless (i) the
         indemnifying party is also a party to such Proceeding and the
         indemnified party determines in good faith that joint representation
         would be inappropriate, or (ii) the indemnifying party fails to provide
         reasonable assurance to the indemnified party of its financial capacity
         to defend such Proceeding and provide indemnification with respect to
         such Proceeding), to assume the defense of such Proceeding with counsel
         satisfactory to the indemnified party and, after notice from the
         indemnifying party to the indemnified party of its election to assume
         the defense of such Proceeding, the indemnifying party will not, as
         long as it diligently conducts such defense, be liable to the
         indemnified party under this Section 5 for any fees of other counsel or
         any other expenses with respect to the defense of such Proceeding, in
         each case subsequently incurred by the indemnified party in connection
         with the defense of such Proceeding, other than reasonable costs of
         investigation. If the indemnifying party assumes the defense of a
         Proceeding, (i) it will be conclusively established for purposes of
         this Agreement that the claims made in that Proceeding are within the
         scope of and subject to indemnification; (ii) no compromise or
         settlement of such claims may be effected by the indemnifying party
         without the indemnified party's consent unless (A) there is no finding
         or admission of any violation of Legal Requirements or any violation of
         the rights of any Person and no effect on any other claims that may be
         made against the indemnified party, and (B) the sole relief provided is
         monetary damages that are paid in full by the indemnifying party; and
         (iii) the indemnified party will have no liability with respect to any
         compromise or settlement of such claims effected without its consent.
         If notice is given to an indemnifying party of the commencement of any
         Proceeding and the indemnifying party does not, within


                                     - 37 -

<PAGE>   41



         ten days after the indemnified party's notice is given, give notice to
         the indemnified party of its election to assume the defense of such
         Proceeding, the indemnifying party will be bound by any determination
         made in such Proceeding or any compromise or settlement effected by the
         indemnified party.

                  (c)      Notwithstanding the foregoing, if an indemnified
         party determines in good faith that there is a reasonable probability
         that a Proceeding may adversely affect it or its affiliates other than
         as a result of monetary damages for which it would be entitled to
         indemnification under this Agreement, the indemnified party may, by
         notice to the indemnifying party, assume the exclusive right to defend,
         compromise, or settle such Proceeding, but the indemnifying party will
         not be bound by any determination of a Proceeding so defended or any
         compromise or settlement effected without its consent (which may not be
         unreasonably withheld).

                  (d)      Sellers hereby consent to the non-exclusive
         jurisdiction of any court in which a Proceeding is brought against any
         Indemnified Person for purposes of any claim that an Indemnified Person
         may have under this Agreement with respect to such Proceeding or the
         matters alleged therein, and agree that process may be served on
         Sellers with respect to such a claim anywhere in the world.

         5.6      PROCEDURE FOR INDEMNIFICATION--OTHER CLAIMS

         A claim for indemnification for any matter not involving a third-party
claim may be asserted by notice to the party from whom indemnification is
sought.

6.       POST-CLOSING COVENANTS

         6.1      SECURITIES FILINGS

         Buyer and Sellers agree to use their respective good faith efforts to
cooperate with each other in connection with all securities filings required to
be made by Sellers, Buyer and the Company in connection with this Agreement and
the Contemplated Transactions, including, without limitation, any filings or
amendments thereto required under Section 13(d) of the Exchange Act.

         6.2      PREPARATION AND FILING OF 1998 TAX RETURN

         Buyer and Sellers agree to fully cooperate with one another in the
preparation, review and timely filing of the Company's 1998 tax return. In
connection therewith, Sellers' Representative shall prepare and submit same to
Buyer for Buyer's review and ultimate filing with the IRS.

         6.3      ASSISTANCE IN CONNECTION WITH TRANSITION MATTERS AND THE
PURCHASE OF THE REMAINING ROYALTY INTERESTS

         Sellers agree to use their reasonable best efforts to assist Buyer in
connection with all transition matters and the Company's participation in the
liquidation process of the Remaining


                                     - 38 -

<PAGE>   42



Royalty Interests. Such activities may include, without limitation, maintaining
communications with Albrecht & Associates in connection with the sale process.

7.       GENERAL PROVISIONS

         7.1      EXPENSES

         Except as otherwise expressly provided in this Agreement, each party to
this Agreement will bear its respective expenses incurred in connection with the
preparation, execution, and performance of this Agreement and the Contemplated
Transactions, including all fees and expenses of agents, representatives,
counsel, and accountants. Sellers will cause the Company not to incur any
out-of-pocket expenses in connection with this Agreement or the Contemplated
Transactions except Buyer's costs associated therewith or, except as otherwise
set forth in this Agreement, any costs after the Closing Date. Sellers shall pay
one hundred percent (100%) of the Company's pro rata share of the fees charged
to the Trust in connection with the liquidation of the Remaining Royalty
Interest. In the event of termination of this Agreement, the obligation of each
party to pay its own expenses will be subject to any rights of such party
arising from a Breach of this Agreement by another party.

         7.2      PUBLIC ANNOUNCEMENTS

         Unless required by Legal Requirements, neither Buyer nor Sellers shall
issue any press release, public announcement or similar publicity with respect
to this Agreement or the Contemplated Transactions without the prior consent of
the other party.

         7.3      SELLERS' REPRESENTATIVE; NOTICES

                  (a)      Each Seller hereby authorizes the Sellers'
         Representative to take all actions, execute and deliver all documents
         and notices, and receive all payments and notices contemplated under
         this Agreement to be taken, executed, delivered or received by Sellers
         or on behalf of Sellers. The foregoing grant of authority is
         irrevocable and a power coupled with an interest and shall survive the
         death of any Seller. Buyer shall be entitled to rely conclusively on
         the power and authority of the Sellers' Representatives and will not be
         obligated to ascertain that any agreement among the Sellers has been
         complied with or inquire into the necessity or expedience of any act or
         action of the Sellers' Representative.

                  (b)      All notices, consents, waivers, and other
         communications under this Agreement must be in writing and will be
         deemed to have been duly given when (a) delivered by hand (with written
         confirmation of receipt), (b) sent by telecopier (with written
         confirmation of receipt), provided that a copy is mailed by registered
         mail, return receipt requested, or (c) when received by the addressee,
         if sent by a nationally recognized overnight delivery service (receipt
         requested), in each case to the appropriate addresses and telecopier
         numbers set forth below (or to such other addresses and telecopier
         numbers as a party may designate by notice to the other parties):



                                     - 39 -

<PAGE>   43



         SELLERS:

         c/o O'Sullivan Oil & Gas Company, Inc.
         Attention: C.N. O'Sullivan
         O'Sullivan Oil & Gas Company, Inc.
         910 Travis Street, Suite 2150
         Houston, Texas 77002
         Telephone: 713-759-2030
         Telecopy: 713-759-2040

         BUYER:

         Dominion Energy, Inc.
         Attention: G.E. Lake, Jr.
         Sr. Vice President - Oil and Gas
         901 E. Byrd Street
         Richmond, VA 23220
         Telephone: 804-775-5724
         Telecopy: 804-775-5839

         with a copy to:

         Dominion Resources, Inc.
         Attention: Mark O. Webb
         Assistant General Counsel
         120 Tredegar Street
         Richmond, VA 23220
         Telephone: 804-819-2140
         Telecopy: 804-819-2202

         7.4      JURISDICTION; SERVICE OF PROCESS

         Any action or proceeding seeking to enforce any provision of, or based
on any right arising out of, this Agreement may be brought against any of the
parties in the courts of the State of Texas, County of Harris, or, if it has or
can acquire jurisdiction, in the United States District Court for the Southern
District of Texas, and each of the parties consents to the jurisdiction of such
courts (and of the appropriate appellate courts) in any such action or
proceeding and waives any objection to venue laid therein. Process in any action
or proceeding referred to in the preceding sentence may be served on any party
anywhere in the world.

         7.5      FURTHER ASSURANCES

         The parties agree (a) to furnish upon request to each other such
further information, (b) to execute and deliver to each other such other
documents, and (c) to do such other acts and things, all as the other party may
reasonably request for the purpose of carrying out the intent of this Agreement
and the documents referred to in this Agreement.


                                     - 40 -

<PAGE>   44



         7.6      WAIVER

         The rights and remedies of the parties to this Agreement are cumulative
and not alternative. Neither the failure nor any delay by any party in
exercising any right, power, or privilege under this Agreement or the documents
referred to in this Agreement will operate as a waiver of such right, power, or
privilege, and no single or partial exercise of any such right, power, or
privilege will preclude any other or further exercise of such right, power, or
privilege or the exercise of any other right, power, or privilege. To the
maximum extent permitted by applicable law, (a) no claim or right arising out of
this Agreement or the documents referred to in this Agreement can be discharged
by one party, in whole or in part, by a waiver or renunciation of the claim or
right unless in writing signed by the other party; (b) no waiver that may be
given by a party will be applicable except in the specific instance for which it
is given; and (c) no notice to or demand on one party will be deemed to be a
waiver of any obligation of such party or of the right of the party giving such
notice or demand to take further action without notice or demand as provided in
this Agreement or the documents referred to in this Agreement.

         7.7      ENTIRE AGREEMENT AND MODIFICATION

         This Agreement supersedes all prior agreements between the parties with
respect to its subject matter and constitutes (along with the documents referred
to in this Agreement) a complete and exclusive statement of the terms of the
agreement between the parties with respect to its subject matter. This Agreement
may not be amended except by a written agreement executed by the party to be
charged with the amendment.

         7.8      DISCLOSURE LETTER

                  (a)      The disclosures in the Disclosure Letter, and those
         in any Supplement thereto, must relate only to the representations and
         warranties in the Section of the Agreement to which they expressly
         relate and not to any other representation or warranty in this
         Agreement.

                  (b)      In the event of any inconsistency between the
         statements in the body of this Agreement and those in the Disclosure
         Letter (other than an exception expressly set forth as such in the
         Disclosure Letter with respect to a specifically identified
         representation or warranty), the statements in the body of this
         Agreement will control.

         7.9      ASSIGNMENTS, SUCCESSORS, AND NO THIRD-PARTY RIGHTS

         Neither party may assign any of its rights under this Agreement without
the prior consent of the other parties, which will not be unreasonably withheld;
provided, however, (a) Sellers shall have the right to convey (i) at closing,
their respective rights and obligations hereunder to the SJP Stub Liquidating
Trust; provided, however Sellers shall remain obligated for all of the duties
and obligations of Sellers hereunder and (ii) all or any portion of the
Contingent Consideration without the prior consent of Buyer; provided, however,
no such transfers of the Contingent Consideration shall be binding upon Buyer
until written notice thereof has been provided to Buyer; and (b) Buyer


                                     - 41 -

<PAGE>   45



shall have the right to assign its rights and obligations hereunder to an
affiliated entity provided, however Buyer shall remain obligated for all of the
duties and obligations of Buyer hereunder.


                                     - 42 -

<PAGE>   46



Subject to the preceding sentence, this Agreement will apply to, be binding in
all respects upon, and inure to the benefit of the successors and permitted
assigns of the parties. Nothing expressed or referred to in this Agreement will
be construed to give any Person other than the parties to this Agreement any
legal or equitable right, remedy, or claim under or with respect to this
Agreement or any provision of this Agreement. This Agreement and all of its
provisions and conditions are for the sole and exclusive benefit of the parties
to this Agreement and their successors and assigns.

         7.10     SEVERABILITY

         If any provision of this Agreement is held invalid or unenforceable by
any court of competent jurisdiction, the other provisions of this Agreement will
remain in full force and effect. Any provision of this Agreement held invalid or
unenforceable only in part or degree will remain in full force and effect to the
extent not held invalid or unenforceable.

         7.11     SECTION HEADINGS, CONSTRUCTION

         The headings of Sections in this Agreement are provided for convenience
only and will not affect its construction or interpretation. All references to
"Section" or "Sections" refer to the corresponding Section or Sections of this
Agreement. All words used in this Agreement will be construed to be of such
gender or number as the circumstances require. Unless otherwise expressly
provided, the word "including" does not limit the preceding words or terms.

         7.12     TIME OF ESSENCE

         With regard to all dates and time periods set forth or referred to in
this Agreement, time is of the essence.

         7.13     GOVERNING LAW

         This Agreement will be governed by the laws of the State of Texas
without regard to conflicts of laws principles.

         7.14     COUNTERPARTS

         This Agreement may be executed in one or more counterparts, each of
which will be deemed to be an original copy of this Agreement and all of which,
when taken together, will be deemed to constitute one and the same agreement.

         IN WITNESS WHEREOF, the parties have executed and delivered this
Agreement as of the date first written above.

                                    BUYER:

                                    Dominion Energy, Inc.

                                    By: /s/ G. E. Lake, Jr.
                                      ------------------------------------------
                                            G.E. Lake, Jr.
                                            Senior Vice President - Oil and Gas


                                     - 43 -

<PAGE>   47



                                    SELLERS:

                                    EnCap Energy Capital Fund III, L.P.

                                    By:      EnCap Investments L.C.,
                                             its general partner

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

                                    EnCap Energy Acquisition III-B, Inc.

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

                                    ECIC Corporation

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

                                    BOCP Energy Partners, L.P.

                                    By:     EnCap Investments L.C.,
                                            its general partner

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

                                    First Union Investors, Inc.


                                    By: /s/ Ted A. Gardner
                                       -----------------------------------------
                                            Ted A. Gardner
                                            Managing Partner

                                    O'Sullivan Oil & Gas Company, Inc.


                                    By: /s/ Christomer N. O'Sullivan
                                       -----------------------------------------
                                            Christopher N. O'Sullivan
                                            President



                                    - 44 -

<PAGE>   48




                                    /s/ Christopher P. Scully
                                    -------------------------------------------
                                    Christopher P. Scully


                                    /s/ Charles T. McCord III
                                    -------------------------------------------
                                    Charles T. McCord III

                                    Scott W. Smith Funding, L.L.C.


                                    By: /s/ Scott W. Smith
                                       ----------------------------------------
                                            Scott W. Smith
                                            Manager


                                    /s/ John V. Whiting
                                    -------------------------------------------
                                    John V. Whiting

                                    Andover Group, Inc.


                                    By: /s/ A. John Knapp, Jr.
                                       ----------------------------------------
                                            A. John Knapp, Jr.
                                            President





                                     - 45 -

<PAGE>   49



Each of the parties listed below hereby executes this Agreement to evidence
their intent and agreement to be bound hereby with respect to their respective
community property interest herein.


                                    /s/ Elizabeth J. Scully
                                    --------------------------------------------
                                    Elizabeth J. Scully,
                                    Spouse of Christopher P. Scully
                                    910 Travis Street, Suite 2150
                                    Houston, Texas 77002


                                    /s/ Suzanne B. McCord
                                    --------------------------------------------
                                    Suzanne B. McCord
                                    Spouse of Charles T. McCord III
                                    1201 Louisiana, Suite 1048
                                    Houston, Texas 77002



                                    /s/ Susan L. Whiting
                                    --------------------------------------------
                                    Susan L. Whiting
                                    Spouse of John V. Whiting
                                    910 Travis, Suite 2150
                                    Houston, Texas 77002




                                     - 46 -

<PAGE>   50


                        SELLERS' REPRESENTATIVE'S JOINDER

The undersigned, intending to be legally bound, joins in the execution of this
Agreement to evidence its agreement to undertake the duties and obligations of
the Sellers' Representative and agrees to be bound by the provisions of this
Agreement relating to Sellers' Representative.


                                       O'Sullivan Oil & Gas Company, Inc.



                                       By: /s/ Christopher N. O'Sullivan
                                          --------------------------------------
                                               Christopher N. O'Sullivan
                                               President



                                     - 47 -
<PAGE>   51



                                    EXHIBIT B

            to Stock Purchase Agreement dated as of January 19, 1999
                      but effective as of January 1, 1999
     between Dominion Energy, Inc., as Buyer, and the Sellers named therein


                               EXCESS GAS PAYMENT


During the Contingent Payment Period (as hereinafter defined), Sellers shall be
entitled to receive from the Company and/or Buyer, and Buyer shall pay or cause
the Company to pay to Sellers by deposit into Sellers' Account in the manner
hereinafter set forth, an aggregate cash sum the "Excess Gas Payment" equal to
One Dollar and Thirty Cents ($1.30) per mmbtu of Excess Gas (as hereinafter
defined). As used herein, the term "Contingent Payment Period" shall mean that
period of time commencing at 12:01 a.m. on January 1, 1999 and ending at 12:00
midnight on December 31, 2002. The term "Excess Gas" shall mean fifty percent
(50%) of the total annual production volume (as measured in Mmbtu's)
attributable to the Company's net revenue interests in (i) the New Mexico
Properties (including, however, the Remaining Royalty Interests if purchased
from the Trust as contemplated herein, said interest being an aggregate
undivided 16.718% in and to the Northeast Blanco Unit) and (ii) the South Texas
Properties, which is in excess of one hundred seventeen and six and one half
tenth percent (117.65%) of the Annual Production Floor (as hereinafter defined).
The total annual production attributable to the Company's interest shall be all
gross production volumes from the wellheads attributable to such interests less
(i) burdens on production attributable to the Company's interest as of the date
hereof (other than the Remaining Royalty Interests) and (ii) shrinkage for CO2.
As used herein, the term "Annual Production Floor" shall mean for each year
within the Contingent Payment Period that quantity of production set forth in
the table below opposite such year which is attributable to the Company's
interest in the New Mexico Properties and the South Texas Properties; provided,
however, if Devon exercises the Devon Option, the Annual Production Floor for
each year set forth below shall be reduced by 6.7%.

                ANNUAL PRODUCTION FLOOR FOR NEW MEXICO PROPERTIES
                         AND THE SOUTH TEXAS PROPERTIES

<TABLE>
<CAPTION>


       Year                      mmbtu's Net to Company's Interest
       ----                      ---------------------------------
<S>                              <C>
       1999                      12,325,000
       2000                      11,985,000
       2001                       9,945,000
       2002                       8,245,000

</TABLE>


The Excess Gas Payment shall be calculated annually based upon each calendar
year within the Contingent Payment Period and shall be due and payable to
Sellers, in cash or immediately available


                                        1

<PAGE>   52


funds by deposit in Sellers' Account, annually on or before ninety (90) days
after the end of the calendar year for which such payment is calculated. The
Excess Gas Payment, if and when accrued, will become an obligation of Buyer and
the Company provided however, the Excess Gas Payment shall survive the transfer
of the Company's interest in the Properties to any third party and shall be
binding upon Buyer, its successors and assigns to the full extent described
herein.

EXAMPLE OF CALCULATION: In the event the total aggregate production attributable
to the Company's interest in the New Mexico Properties and the South Texas
Properties as described above, for 1999 is 18,000,000 mmbtus, the Excess Gas
Payment for 1999 shall be calculated as follows:

18,000,000 mmbtu's - (12,325,000 x 1.1765) mmbtu's = 3,499,637.5 mmbtu's x 50% =
1,749,818.75 mmbtu's x $1.30 mmbtu= $2,274,764.38.




                                        2



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