BURLINGTON RESOURCES COAL SEAM GAS ROYALTY TRUST
SC 13D/A, 1998-10-26
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. 26

                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)

                                OCTOBER 21, 1998
            (DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

*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.




================================================================================
<PAGE>   2
                                SCHEDULE 13D
<TABLE>
<S>                                                                                   <C>
CUSIP No. 122016 10 8                                                                 Page    2    of    17    Pages
                                                                                           -------    --------      
- ----------------------------------------------------------------------------------------------------------------------
            NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     1
                    San Juan Partners, L.L.C.
- ----------------------------------------------------------------------------------------------------------------------
            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                               (a)  [x]
     2                                                                                                        (b)  [ ]
- ----------------------------------------------------------------------------------------------------------------------
            SEC USE ONLY
     3
- ----------------------------------------------------------------------------------------------------------------------
            SOURCE OF FUNDS (See Instructions)
     4
                    AF, BK
- ----------------------------------------------------------------------------------------------------------------------
            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                [ ]
     5
- ----------------------------------------------------------------------------------------------------------------------
            CITIZENSHIP OR PLACE OF ORGANIZATION
     6
                    Texas
- ----------------------------------------------------------------------------------------------------------------------
                                           SOLE VOTING POWER
                                   7
                                             0 Units
                                   -----------------------------------------------------------------------------------
          NUMBER OF                        SHARED VOTING POWER
           SHARES                  8
        BENEFICIALLY                         5,867,968 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0 Units
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 66.68%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 OO
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>




                                       2
<PAGE>   3

================================================================================
                                 SCHEDULE 13D
<TABLE>
<S>                                                                                   <C>
 CUSIP No. 122016 10 8                                                                 Page    3    of    17    Pages
                                                                                            -------    --------      
- -----------------------------------------------------------------------------------------------------------------------
             NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      1
               EnCap Energy Capital Fund III, L.P.
- -----------------------------------------------------------------------------------------------------------------------
             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                               (a)  [x]
      2                                                                                                        (b)  [ ]

- -----------------------------------------------------------------------------------------------------------------------
             SEC USE ONLY
      3

- -----------------------------------------------------------------------------------------------------------------------
             SOURCE OF FUNDS (See Instructions)
      4
               WC
- -----------------------------------------------------------------------------------------------------------------------
             CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                [ ]
      5

- -----------------------------------------------------------------------------------------------------------------------
             CITIZENSHIP OR PLACE OF ORGANIZATION
      6
               Texas
- -----------------------------------------------------------------------------------------------------------------------
                                           SOLE VOTING POWER
                                   7
                                             0
                                   ------------------------------------------------------------------------------------
          NUMBER OF                        SHARED VOTING POWER
           SHARES                  8
        BENEFICIALLY                         5,867,968 Units
          OWNED BY                 ------------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   ------------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,867,968 Units
- -----------------------------------------------------------------------------------------------------------------------
                               AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
              11

                                  5,867,968 Units
- -----------------------------------------------------------------------------------------------------------------------
                               CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
              12

- -----------------------------------------------------------------------------------------------------------------------
                               PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
              13

                                  66.68%
- -----------------------------------------------------------------------------------------------------------------------
                               TYPE OF REPORTING PERSON*
              14
                                  PN
- -----------------------------------------------------------------------------------------------------------------------
</TABLE>




                                      3

<PAGE>   4
                                  SCHEDULE 13D

<TABLE>
<S>                                                                                   <C>
CUSIP No. 122016 10 8                                                                 Page    4    of    17    Pages
                                                                                           -------    --------      
- ----------------------------------------------------------------------------------------------------------------------
            NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     1
              EnCap Energy Acquisition III-B, Inc.
- ----------------------------------------------------------------------------------------------------------------------
            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                               (a)  [x]
     2                                                                                                        (b)  [ ]
- ----------------------------------------------------------------------------------------------------------------------
            SEC USE ONLY
     3
- ----------------------------------------------------------------------------------------------------------------------
            SOURCE OF FUNDS (See Instructions)
     4
              WC
- ----------------------------------------------------------------------------------------------------------------------
            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                [ ]
     5
- ----------------------------------------------------------------------------------------------------------------------
            CITIZENSHIP OR PLACE OF ORGANIZATION
     6
              Texas
- ----------------------------------------------------------------------------------------------------------------------
                                           SOLE VOTING POWER
                                   7
                                             0
                                   -----------------------------------------------------------------------------------
          NUMBER OF                        SHARED VOTING POWER
           SHARES                  8
        BENEFICIALLY                         5,867,968 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 66.68%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 CO
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>




                                      4
<PAGE>   5
5,                                  SCHEDULE 13D

<TABLE>
<S>                                                                                   <C>
CUSIP No. 122016 10 8                                                                 Page    5    of    17    Pages
                                                                                           -------    --------      
- ----------------------------------------------------------------------------------------------------------------------
            NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     1
              ECIC Corporation
- ----------------------------------------------------------------------------------------------------------------------
            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                               (a)  [x]
     2                                                                                                        (b)  [ ]
- ----------------------------------------------------------------------------------------------------------------------
            SEC USE ONLY
     3
- ----------------------------------------------------------------------------------------------------------------------
            SOURCE OF FUNDS (See Instructions)
     4
              WC
- ----------------------------------------------------------------------------------------------------------------------
            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                [ ]
     5
- ----------------------------------------------------------------------------------------------------------------------
            CITIZENSHIP OR PLACE OF ORGANIZATION
     6
              Texas
- ----------------------------------------------------------------------------------------------------------------------
                                           SOLE VOTING POWER
                                   7
                                             0
                                   -----------------------------------------------------------------------------------
          NUMBER OF                        SHARED VOTING POWER
           SHARES                  8
        BENEFICIALLY                         5,867,968 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 66.68%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 CO
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>



                                      5
<PAGE>   6
                                  SCHEDULE 13D

<TABLE>
<S>                                                                                   <C>
CUSIP No. 122016 10 8                                                                 Page    6    of    17    Pages
                                                                                           -------    --------      
- ----------------------------------------------------------------------------------------------------------------------
            NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     1
              BOCP Energy Partners, L.P.
- ----------------------------------------------------------------------------------------------------------------------
            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                               (a)  [x]
     2                                                                                                        (b)  [ ]
- ----------------------------------------------------------------------------------------------------------------------
            SEC USE ONLY
     3
- ----------------------------------------------------------------------------------------------------------------------
            SOURCE OF FUNDS (See Instructions)
     4
              WC
- ----------------------------------------------------------------------------------------------------------------------
            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                [ ]
     5
- ----------------------------------------------------------------------------------------------------------------------
            CITIZENSHIP OR PLACE OF ORGANIZATION
     6
              Texas
- ----------------------------------------------------------------------------------------------------------------------
                                           SOLE VOTING POWER
                                   7
                                             0
                                   -----------------------------------------------------------------------------------
          NUMBER OF                        SHARED VOTING POWER
           SHARES                  8
        BENEFICIALLY                        5,867,968 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                           0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                            5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 66.68%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 PN
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>




                                      6
<PAGE>   7
                                  SCHEDULE 13D


<TABLE>
<S>                                                                                   <C>
CUSIP No. 122016 10 8                                                                 Page    7    of    17    Pages
  
                                                                                         -------    --------      
- ----------------------------------------------------------------------------------------------------------------------
            NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     1
              First Union Investors, Inc.
- ----------------------------------------------------------------------------------------------------------------------
            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                               (a)  [x]
                                                                                                              (b)  [ ]
     2
- ----------------------------------------------------------------------------------------------------------------------
            SEC USE ONLY
     3
- ----------------------------------------------------------------------------------------------------------------------
            SOURCE OF FUNDS (See Instructions)
     4
              WC
- ----------------------------------------------------------------------------------------------------------------------
            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                [ ]
     5
- ----------------------------------------------------------------------------------------------------------------------
            CITIZENSHIP OR PLACE OF ORGANIZATION
     6
              North Carolina
- ----------------------------------------------------------------------------------------------------------------------
                                           SOLE VOTING POWER
                                   7
                                             0
                                   -----------------------------------------------------------------------------------
          NUMBER OF                        SHARED VOTING POWER
           SHARES                  8
        BENEFICIALLY                         5,867,968 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 66.68%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 CO
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>




                                       7
<PAGE>   8
                                  SCHEDULE 13D


<TABLE>
<S>                                                                                   <C>
CUSIP No. 122016 10 8                                                                 Page    8    of    17    Pages
                                                                                           -------    --------      
- ----------------------------------------------------------------------------------------------------------------------
            NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     1
              Andover Group, Inc.
- ----------------------------------------------------------------------------------------------------------------------
            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                               (a)  [x]
     2                                                                                                        (b)  [ ]
- ----------------------------------------------------------------------------------------------------------------------
            SEC USE ONLY
     3
- ----------------------------------------------------------------------------------------------------------------------
            SOURCE OF FUNDS (See Instructions)
     4
              WC
- ----------------------------------------------------------------------------------------------------------------------
            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                [ ]
     5
- ----------------------------------------------------------------------------------------------------------------------
            CITIZENSHIP OR PLACE OF ORGANIZATION
     6
              Texas
- ----------------------------------------------------------------------------------------------------------------------
                                           SOLE VOTING POWER
                                   7
                                             0
                                   -----------------------------------------------------------------------------------
          NUMBER OF                        SHARED VOTING POWER
           SHARES                  8
        BENEFICIALLY                         5,867,968 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 66.68%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 CO
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>





                                       8
<PAGE>   9
                                  SCHEDULE 13D

<TABLE>
<S>                                                                                   <C>
CUSIP No. 122016 10 8                                                                 Page    9    of    17    Pages
                                                                                           -------    --------      
- ----------------------------------------------------------------------------------------------------------------------
            NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     1
              Charles T. McCord III
- ----------------------------------------------------------------------------------------------------------------------
            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                               (a)  [x]
     2                                                                                                        (b)  [ ]
- ----------------------------------------------------------------------------------------------------------------------
            SEC USE ONLY
     3
- ----------------------------------------------------------------------------------------------------------------------
            SOURCE OF FUNDS (See Instructions)
     4
              PF
- ----------------------------------------------------------------------------------------------------------------------
            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                [ ]
     5
- ----------------------------------------------------------------------------------------------------------------------
            CITIZENSHIP OR PLACE OF ORGANIZATION
     6
              United States
- ----------------------------------------------------------------------------------------------------------------------
                                           SOLE VOTING POWER
                                   7
                                             0
                                   -----------------------------------------------------------------------------------
          NUMBER OF                        SHARED VOTING POWER
           SHARES                  8
        BENEFICIALLY                         5,867,968 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 66.68%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 IN
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>




                                      9
<PAGE>   10
                                  SCHEDULE 13D


<TABLE>
<S>                                                                                  <C>
CUSIP No. 122016 10 8                                                                Page    10    of    17    Pages
                                                                                          --------    --------      
- ----------------------------------------------------------------------------------------------------------------------
            NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     1
              O'Sullivan Oil & Gas Company, Inc.
- ----------------------------------------------------------------------------------------------------------------------
            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                               (a)  [x]
     2                                                                                                        (b)  [ ]
- ----------------------------------------------------------------------------------------------------------------------
            SEC USE ONLY
     3
- ----------------------------------------------------------------------------------------------------------------------
            SOURCE OF FUNDS (See Instructions)
     4
              WC
- ----------------------------------------------------------------------------------------------------------------------
            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                [ ]
     5
- ----------------------------------------------------------------------------------------------------------------------
            CITIZENSHIP OR PLACE OF ORGANIZATION
     6
              Texas
- ----------------------------------------------------------------------------------------------------------------------
                                           SOLE VOTING POWER
                                   7
                                             0
                                   -----------------------------------------------------------------------------------
          NUMBER OF                        SHARED VOTING POWER
           SHARES                  8
        BENEFICIALLY                         5,867,968 Units
          OWNED BY                 -----------------------------------------------------------------------------------

            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 66.68%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 CO
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>





                                      10
<PAGE>   11
                                  SCHEDULE 13D


<TABLE>
<S>                                                                                  <C>
CUSIP No. 122016 10 8                                                                Page    11    of    17    Pages
                                                                                          --------    --------      
- ----------------------------------------------------------------------------------------------------------------------
            NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     1
              Christopher P. Scully
- ----------------------------------------------------------------------------------------------------------------------
            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                               (a)  [x]
     2                                                                                                        (b)  [ ]
- ----------------------------------------------------------------------------------------------------------------------
            SEC USE ONLY
     3
- ----------------------------------------------------------------------------------------------------------------------
            SOURCE OF FUNDS (See Instructions)
     4
              PF
- ----------------------------------------------------------------------------------------------------------------------
            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                [ ]
     5
- ----------------------------------------------------------------------------------------------------------------------
            CITIZENSHIP OR PLACE OF ORGANIZATION
     6
              United States
- ----------------------------------------------------------------------------------------------------------------------
                                           SOLE VOTING POWER
                                   7
                                             0
                                   -----------------------------------------------------------------------------------
          NUMBER OF                        SHARED VOTING POWER
           SHARES                  8
        BENEFICIALLY                         5,867,968 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 66.68%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 IN
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>





                                      11
<PAGE>   12
                                  SCHEDULE 13D


<TABLE>
<S>                                                                                  <C>
CUSIP No. 122016 10 8                                                                Page    12    of    17    Pages
                                                                                          --------    --------      
- ----------------------------------------------------------------------------------------------------------------------
            NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     1
              Scott W. Smith Funding, L.L.C.
- ----------------------------------------------------------------------------------------------------------------------
            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                               (a)  [x]
     2                                                                                                        (b)  [ ]
- ----------------------------------------------------------------------------------------------------------------------
            SEC USE ONLY
     3
- ----------------------------------------------------------------------------------------------------------------------
            SOURCE OF FUNDS (See Instructions)
     4
              WC
- ----------------------------------------------------------------------------------------------------------------------
            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                [ ]
     5
- ----------------------------------------------------------------------------------------------------------------------
            CITIZENSHIP OR PLACE OF ORGANIZATION
     6
              Texas
- ----------------------------------------------------------------------------------------------------------------------
                                           SOLE VOTING POWER
                                   7
                                             0
                                   -----------------------------------------------------------------------------------
          NUMBER OF                        SHARED VOTING POWER
           SHARES                  8
        BENEFICIALLY                        5,867,968 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                            5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 66.68%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 OO
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>





                                      12
<PAGE>   13
                                  SCHEDULE 13D


<TABLE>
<S>                                                                                  <C>
CUSIP No. 122016 10 8                                                                Page    13    of    17    Pages
                                                                                          --------    --------      
- ----------------------------------------------------------------------------------------------------------------------
            NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     1
              John V. Whiting
- ----------------------------------------------------------------------------------------------------------------------
            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                               (a)  [x]
     2                                                                                                        (b)  [ ]
- ----------------------------------------------------------------------------------------------------------------------
            SEC USE ONLY
     3
- ----------------------------------------------------------------------------------------------------------------------
            SOURCE OF FUNDS (See Instructions)
     4
              PF
- ----------------------------------------------------------------------------------------------------------------------
            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                [ ]
     5
- ----------------------------------------------------------------------------------------------------------------------
            CITIZENSHIP OR PLACE OF ORGANIZATION
     6
              United States
- ----------------------------------------------------------------------------------------------------------------------
                                           SOLE VOTING POWER
                                   7
                                             0
                                   -----------------------------------------------------------------------------------
          NUMBER OF                        SHARED VOTING POWER
           SHARES                  8
        BENEFICIALLY                         5,867,968 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,867,968 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 66.68%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 IN
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>





                                      13
<PAGE>   14
         This Amendment No. 26 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 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

Item 3 is amended as follows:

         On October 9, 1998, Purchaser amended its Advancing Term Credit
Agreement dated January 15, 1998 by entering into that certain Second Amendment
to Loan Agreement (the "Second Amendment") with Bank One, Texas, N.A. (the
"Lender").  The principal modification set forth in the Second Amendment is to
increase the amount the Lender will lend to the Purchaser up to the lesser of
$26,500,000 or the Borrowing Base; the Borrowing Base is an amount equal to 50%
of the purchase price of the Units purchased by Purchaser.


ITEM 4.  PURPOSE OF THE TRANSACTION

Item 4 is amended as follows:

         The purpose of the transaction is to initiate proceedings to pursue
the termination of the Trust.  It is the Purchaser's intention, pursuant to the
terms of that certain Purchase Agreement dated October 21, 1998 between the
Purchaser and Burlington Oil & Gas Company ("BROG") described in Item 6 hereof,
to call a meeting of Unitholders or request that a meeting of the Unitholders
be called as soon as practicable for the purpose of voting on the termination
and liquidation of the Trust.  The calling and holding of a meeting of
Unitholders will be subject to the written information statement requirements
pursuant to Rule 14c-2 promulgated under the Securities Exchange Act of 1934,
as amended (the "Exchange Act").  If a meeting of the Unitholders is held
concerning the termination of the Trust, the Purchaser intends to vote any and
all Units owned by it or over which it has voting control at the time of such
meeting in favor of terminating and liquidating the Trust.  The Purchaser
currently owns or has voting control over in excess of 66 2/3% of the
outstanding Units.  Pursuant to the Trust Agreement, the affirmative vote of
holders of not less than 66 2/3% of the outstanding Units for a proposal to
terminate the Trust is required in order for the Trust to be terminated.

         More comprehensive information concerning meetings of the Unitholders
and the procedures concerning the termination of the Trust is included in the
Trust Agreement (which was filed as Exhibit 4.1 to the Trust's Quarterly Report
on Form 10-Q for the quarter ended June 30, 1993), and the information set
forth in this Item 4 is qualified in its entirety by reference to the Trust
Agreement.

         Upon the consummation of the transactions contemplated by the Purchase
Agreement described in Item 6 hereof, Purchaser will acquire under the Purchase
Agreement, among other things, all of Burlington Resources Oil & Gas Company's
("BROG") right, title and interest, if any, under the Trust Agreement, to the
extent assignable, including BROG's rights (i) pursuant to Section 9.03(c)
thereof, to make a written cash offer to purchase the Remaining Royalty
Interests (as defined in the Trust Agreement) owned by the Trust before the
sixtieth day following the affirmative vote of the Unitholders to terminate the
Trust, and (ii) pursuant to Section 5.03(e) thereof, to purchase the Remaining
Royalty Interests for a cash purchase price equal to 105% of the highest offer
received by the Trustee for such interests if the Trustee elects to defer
action on any original offer submitted pursuant to





                                       14
<PAGE>   15
clause (i) above.  See Item 6 - "Contracts, Arrangements, Understandings or
Relationships with Respect to Securities of the Issuer."

         It is the current intention of the Purchaser to offer or bid to
purchase the Remaining Royalty Interests following an affirmative vote of the
Unitholders to terminate the Trust through the exercise of the rights under
Section 9.03(c) and (e) of the Trust Agreement acquired from BROG as described
in the preceding paragraph.  Whether the Purchaser will so offer or bid, and if
so, be successful, will be dependent on a number of factors, including the
price and terms of the offers or bids received from any third party bidders.
For these reasons, no assurances can be given that the Purchaser will offer or
bid, and if so, be successful in its efforts, to acquire the Remaining Royalty
Interests.  In the event that the Purchaser is unsuccessful in acquiring the
Remaining Royalty Interests and the Remaining Royalty Interests are sold to a
third party, then the leases subject thereto will continue to be burdened by
the Remaining Royalty Interests pursuant to the terms of that certain Net
Profits Interest Conveyance dated effective May 1, 1993, from Meridian Oil
Production Inc. to the Trust (the "Net Profits Conveyance").  However, in the
event that the Purchaser is successful in acquiring the Remaining Royalty
Interests, it is anticipated that the Purchaser would seek to merge its title
in and to the Remaining Royalty Interests into its title in the leasehold
interests acquired from BROG under the Purchase Agreement, so that the
Remaining Royalty Interests would terminate and the leasehold interests would
no longer be burdened thereby.  As owner of leasehold and related interests in
the Fruitland coal formation underlying the Northeast Blanco Unit in San Juan
and Arriba Counties, New Mexico, the Purchaser would have rights to consent to
and participate in decisions concerning future exploration, development and
exploitation of such interests to the extent of its interests therein as well
as monetize any Section 29 tax credits attributable to its working interest.
Following any merger of title of the Remaining Royalty Interests and such
leasehold interests, Purchaser may elect to sell such combined interests, or
the Purchaser may elect to retain such combined interests for its own account.
See Item 6 - "Contracts, Arrangements, Understandings or Relationships with
Respect to Securities of the Issuer."

         An affirmative vote to terminate and liquidate the Trust could
adversely affect the liquidity and market value of the Units held by the
public.  Following such a vote but prior to the complete liquidation of the
Trust, the Units may be delisted by the New York Stock Exchange ("NYSE"), and
the registration of the Units under the Exchange Act, may be terminated.
Following the completion of a liquidation of the Trust, the Units shall be
delisted from the NYSE and deregistered under the Exchange Act if they have not
yet been so delisted and deregistered as of such time.

         According to the NYSE's published guidelines, the NYSE would consider
delisting the Units if, among other things, (i) the operating assets of the
Trust have been or are to be substantially reduced such as by sale, spin off,
distribution, or discontinuance, or the Trust has ceased to be an operating
company or discontinued a substantial portion of its operations or business;
(ii) liquidation of the Trust has been authorized and the Trust is committed to
proceed; or (iii) the registration of the Trust under the Exchange Act is no
longer effective.

         Following a vote of the Unitholders approving the termination of the
Trust, the Units may no longer meet the requirements of the NYSE for continued
listing and may, therefore,





                                       15
<PAGE>   16
be delisted from such exchange.  If, as a result of the approval of the
termination of the Trust or otherwise, the Units no longer meet the
requirements of the NYSE for continued listing and/or trading and such trading
of the Units were discontinued, the market for such Units could be adversely
affected.

         In the event of the delisting of the Units by the NYSE, it is possible
that, prior to the complete liquidation of the Trust, the Units would continue
to trade on another securities exchange or in the over-the-counter market and
that price quotations would be reported by such exchange, by the National
Association of Securities Dealers, Inc. (the "NASD") through the NASD Automated
Quotation System ("Nasdaq") or by other sources.  The extent of the public
market for Units and the availability of such quotations would, however, depend
upon such factors as the number of Unitholders remaining at such time, the
interest in maintaining a market in such Units on the part of securities firms,
the possible termination of registration under the Exchange Act as described
below and other factors.  The Units will be delisted from the NYSE upon the
completion of the liquidation of the Trust, if they have not been so
deregistered prior to such time.

         The Units are currently registered under the Exchange Act.  The vote
of the Unitholders to terminate the Trust may result in the Units becoming
eligible for deregistration under the Exchange Act.  Registration of the Units
under the Exchange Act may be terminated upon application of the Trust to the
Commission if the Units are not listed on a national securities exchange and
there are fewer than 300 record holders of the Units.  Termination of
registration of the Units under the Exchange Act would substantially reduce the
information required to be furnished by the Trust to Unitholders and to the
Commission and would make certain provisions of the Exchange Act, such as the
short-swing profit recovery provisions of Section 16(b) of the Exchange Act and
the requirements of furnishing a proxy or information statement in connection
with Unitholders' meeting pursuant to Section 14 of the Exchange Act, no longer
applicable to the Trust. Furthermore, the ability of "affiliates" of the Trust
and persons holding "restricted securities" of the Trust to dispose of such
securities pursuant to Rule 144 promulgated under the Securities Act of 1933,
as amended, may be impaired or eliminated.  In addition, if registration of the
Units under the Exchange Act were terminated, the Units would no longer be
eligible for listing or Nasdaq reporting.

         It is the present intention of the Purchaser to seek to cause the
Trust to make such an application for termination of registration of the Units
as soon as practicable under the circumstances following an approval of the
termination of the Trust by the Unitholders if the requirements for termination
of registration are met.  The Units will be deregistered under the Exchange Act
upon the completion of the liquidation of the Trust if they have not been so
deregistered prior to such time.

         The Units are presently "margin securities" under the regulations of
the Board of Governors of the Federal Reserve System (the "Federal Reserve
Board"), which has the effect, among other things, of allowing brokers to
extend credit on the collateral of such Units for the purpose of buying,
carrying or trading in securities ("Purpose Loans").  Depending upon factors
such as the number of record holders of the Units and the number and market
value of publicly held Units, following the termination of the Trust, the Units
may no longer





                                       16
<PAGE>   17
constitute margin securities for purposes of the Federal Reserve Board's margin
regulations and, therefore, could no longer be used as collateral for Purpose
Loans made by brokers.  In addition, if registration of the Units under the
Exchange Act were terminated, the Units would no longer constitute margin
securities.

         Except as provided herein and in Item 6 below, the Purchaser has no
present plans or proposals (i) to vote its Units for the removal of either the
Trustee or the Delaware Trustee, (ii) to change the distributions of the Trust,
or (iii) that relate to or that would result in any of the other actions
specified in clauses (a) through (j) of Item 4 of Schedule 13D promulgated
under the Securities Exchange Act of 1934, as amended.


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

Item 6 is amended as follows:

         On October 21, 1998, the Purchaser entered into a Purchase and Sale
Agreement (the "Purchase Agreement") with Burlington Resources Oil & Gas
Company ("BROG"), as contemplated by the Letter of Intent entered into between
the Purchaser and BROG on September 17, 1998.  Pursuant to the terms of the
Purchase Agreement, BROG has agreed to sell (or cause to be sold) and Purchaser
has agreed to buy all of BROG's right, title and interest in and to (i) certain
leases, leasehold interests and overriding royalty interests of BROG in and to
the Fruitland coal formation in the Northeast Blanco Unit ("NEBU"), in San Juan
and Rio Arriba Counties, New Mexico (the "Leases"); (ii) the wells, fixtures
and equipment in connection with the Leases; (iii) that certain Northeast
Blanco Unit Agreement dated July 16, 1951 (the "Unit Agreement") and that
certain Unit Operating Agreement dated July 16, 1951, as amended on May 14,
1959 and January 24, 1991 (the "Unit Operating Agreement"), insofar as same
cover the Fruitland coal formation; (iv) certain gas purchase contracts,
product purchase and sale agreements, gas gathering agreements and gas
processing agreements related to the Leases (to the extent they are assignable)
including, but not limited to, that certain Gas Purchase Contract dated
effective May 1, 1993, by and between Meridian Oil Trading Inc. and Meridian
Oil Production Inc. (the "Gas Contract"); (v) any equipment leases and rental
contracts related to the interests conveyed, to the extent assignable; (vi) the
rights of BROG, if any, under the Trust Agreement to the extent assignable; and
(vii) the rights of BROG, assignor, under that certain Net Profits Interest
Conveyance (the "Net Profits Conveyance") dated effective May 1, 1993 from
Meridian Oil Production Inc. to the Burlington Resources Coal Seam Gas Royalty
Trust (the "Trust") (collectively, the "Interests").  In addition, the Purchase
Agreement provides that the Purchaser shall acquire (x) certain rights of BRI
under the Trust Agreement and that certain Administrative Services Agreement
dated effective May 1, 1993 by and between BRI and the Trust (the
"Administrative Services Agreement") and (y) certain rights of Burlington
Resources Trading Inc.  ("BRTI") under that certain Gathering Agreement
(defined herein), all as described below.  The effective date of the
conveyances contemplated under the Purchase Agreement is July 1, 1998 (the
"Effective Time").  Substantially all of the working interests owned by BROG
under the Leases are burdened by the Net Profits Interests, which comprise the
Trust Estate and the Units of Beneficial Interest therein.





                                       17
<PAGE>   18

         The Purchaser has agreed to pay a purchase price of $20,750,000 cash
for the Interests, which amount may be adjusted, among other things, (i) for
certain Title Defects or Environmental Defects (as those terms are defined in
the Purchase Agreement) associated with the Interests; (ii) in the event of
certain casualty losses or upon the failure of BROG to obtain certain required
consents to an assignment of a Lease; or (iii) for certain natural gas
imbalances with respect to the Interests.

         The obligation of BROG to close the transactions contemplated by the
Purchase Agreement is subject to certain conditions, including (i) the
termination of all of BRI's obligations (other than obligations relating to the
wind-up of the Trust and any obligations which expressly survive the
termination of the Trust) under the Trust Agreement and under the
Administrative Services Agreement; (ii) that the total adjustments to the
purchase price do not exceed $4,000,000; (iii) there being no pending legal or
equitable action seeking to enjoin, prohibit or declare illegal the purchase
and sale of the Interests as contemplated by the Purchase Agreement; and (iv)
all consents, approvals and waivers required to be obtained in order to
consummate the transactions shall have been obtained, other than consents and
approvals that are customarily obtained after the consummation of similar
transactions.  The obligation of the Purchaser to close the Purchase Agreement
is also subject to certain similar conditions.

         As of the Closing Date (as defined below), BROG has agreed to retain
and perform (except to the extent expressly assumed by the Purchaser pursuant
to the Purchase Agreement) the liabilities and obligations of BROG (i) that
relate to periods prior to the Effective Time and which arise under the Trust
Agreement or the Net Profits Conveyance; (ii) that relate to periods prior to
the Effective Time arising under existing leases, operating agreements, gas
purchase contracts or other agreements relating to the Interests; and (iii)
that relate to the gross negligence or willful misconduct of BROG during the
period between the Effective Time and the Closing Date.

         In addition, BROG has agreed, to the fullest extent permitted by law,
to indemnify the Purchaser and certain of its related parties for claims
arising out of (i) the ownership or operation of the Interests prior to the
Effective Time, (ii) BROG's retention of certain obligations or liabilities in
accordance with the terms of the Purchase Agreement, (iii) the breach by BROG
of its representations contained in the Purchase Agreement, and (iv) the breach
by BROG of any of its agreements and covenants contained in the Purchase
Agreement.  Notwithstanding the preceding, the indemnity does not include (x)
matters pertaining to title to the Interests, (y) any claims with respect to
any and all actual, alleged or threatened gas balancing liabilities and
obligations, or (z) any claims with respect to any violation of environmental
laws (regardless of the dollar amount in issue) waived pursuant to the Purchase
Agreement or any other claims relating to the Interests (including
environmental claims) expressly assumed by the Purchaser under the Purchase
Agreement.





                                       18
<PAGE>   19
         As of the Closing Date, the Purchaser has agreed to assume and perform
(except to the extent expressly retained by BROG pursuant to the Purchase
Agreement) the liabilities and obligations of BROG that pertain to the
ownership and operation of the Interests (i) that relate to periods after the
Effective Time and arise under the Trust Agreement or the Net Profits
Conveyance, (ii) that relate to periods after the Effective Time and that arise
under the existing leases, operating agreements, gas purchase contracts or
other agreements relating to the Interests, (iii) in connection with balancing
of overproduction or underproduction from the Interests relating to periods
before or after the Effective Time, (iv) that relate to environmental claims,
to the extent the aggregate cost to remediate such environmental claims does
not exceed $250,000, net to BROG's interest in the affected Interests, and (v)
for any violation of environmental laws waived pursuant to the Purchase
Agreement.  As of the Closing Date, the Purchaser has also agreed to assume and
perform  the liabilities and obligations of BRI that relate to periods after
the Effective Time and arise under the Trust Agreement or the Administrative
Services Agreement.  Additionally, as of the Closing Date, the Purchaser has
agreed to assume and perform any and all liabilities and obligations to comply
with all laws and governmental regulations with respect to the Interests
relating to events which occur after the Effective Time.

         The Purchaser has also agreed, to the fullest extent permitted by law,
to indemnify BROG, BRI and certain of their related parties (the "Seller
Parties") from and against any and all claims attributable to or arising out of
the following: (i) the ownership or operation of the Interests subsequent to
the Effective Time, (ii) the Purchaser's assumption of any obligation or
liability contained in the Purchase Agreement, (iii) the breach by the
Purchaser of its representations, agreements or covenants contained in the
Purchase Agreement, and (iv) any act, omission, event, condition or
circumstance involving or relating to the Interests occurring or existing
before the Effective Time that was waived pursuant to the terms of the Purchase
Agreement.

         The Purchaser has further agreed, to the fullest extent permitted by
law, to indemnify and hold the Seller Parties harmless from and against any and
all claims attributable to or arising out of any claims or actions by or
through any holder of any interest in the Trust in connection with the
transactions contemplated by the Purchase Agreement or the termination or
liquidation of the Trust as contemplated by the Purchase Agreement.

         In addition, the Purchaser has agreed, to the fullest extent permitted
by law, to indemnify the Seller Parties from and against any loss, claim,
damage or liability, joint or several, or any action in respect thereof, to
which the Seller Parties become subject under the Exchange Act, insofar as such
loss, claim, damage, liability or action arises out of or is based upon, (i)
any actual or alleged untrue statement of a material fact contained in any
preliminary or definitive proxy statement, information statement, other
solicitation material or any other document filed by or on behalf of the
Purchaser with the Securities and Exchange Commission (the "Commission"), or
any other statement publicly made by or on behalf of the Purchaser in
connection with the proposal by the Purchaser to terminate the Trust or any
actions taken by or behalf of the Purchaser after such termination, or (ii) the
actual or alleged omission to state in any preliminary or definitive proxy
statement, information statement, other solicitation material or any other
document filed by or on behalf of the Purchaser with the Commission, or any
other statement publicly made by or on behalf 




                                       19
<PAGE>   20
of the Purchaser in connection with the proposal by the Purchaser to terminate
the Trust or any actions taken by or on behalf of the Purchaser after such
termination, any material fact required to be stated therein or necessary to
make the statements therein not misleading. The Purchaser, however, will not
be liable to the extent that any such claim arises out of, or is based upon,
(x) any fraudulent misrepresentation, gross negligence or willful misconduct of
BROG or (y) any untrue statement or omission  included in any such preliminary
or definitive proxy statement, information statement or other solicitation
material in reliance upon and in conformity with written information furnished
to the Purchaser or the trustee of the Trust by or on behalf of BROG or any
third party specifically for inclusion therein.

         If the indemnification described above is unavailable for any reason
or is insufficient to hold harmless the Seller Parties in respect of any such
loss, claim, damage or liability, or any action in respect thereof, then the
Purchaser shall, in lieu of indemnifying the Seller Parties, contribute to the
amount paid or payable by the Seller Parties as a result of such loss, claim,
damage or liability, or action in respect thereof, in such proportion as
appropriate to reflect the relative fault of the Purchaser with respect to the
statements or omissions which resulted in such loss, claim, damage or
liability, or action in respect thereof, as well as any other relevant
equitable considerations. The relative fault shall be determined by reference
to whether the actual or alleged untrue statement of a material fact or
omission to state a material fact relates to information supplied by the
Purchaser to the Seller Parties.

         The Purchase Agreement provides that the closing is to be held no
later than ten business days following the Termination Date (as defined below),
or at such other time as BROG and the Purchaser may agree (the "Closing" or the
"Closing Date").  The "Termination Date" is defined as the date on which all of
the following conditions have been fully satisfied:  (i) the Unitholders of the
Trust have approved, by an affirmative vote or consent, the termination and
liquidation of the Trust in accordance with Article VIII and Section 9.02 of
the Trust Agreement and (ii) the clearance or approval of the transactions
contemplated in clause (i) above and any related filings required or advisable
under applicable laws and regulations by all governmental authorities and with
any applicable stock exchange requirements.

         At the Closing, (i) Purchaser will execute and BROG will cause
Burlington Resources Gathering Inc. ("BRGI"), as successor-in-interest to
Meridian Oil Gathering Inc. ("MOGI") to execute and deliver an amendment to
that certain Gas Gathering, Dehydrating and Treating Agreement dated May 3,
1990 between MOGI and BRTI as successor-in-interest to Meridian Oil Trading
Inc. ("MOTI"), as previously amended (the "Gathering Agreement"), pursuant to
which BRGI will agree to gather, dehydrate, treat and deliver up to 58,000 MCFD
of Purchaser's gas for a specified fee through at least December 31, 2007; (ii)
the Purchaser will execute, and BROG will cause BRTI, as successor-in-interest
to MOTI, to execute and deliver, an agreement pursuant to which the Gas
Contract will be terminated, on the last day of the month in which the
Termination Date occurs; and (iii) Purchaser shall execute and deliver and BROG
shall cause BRTI to execute and deliver, an agreement whereby each time
Purchaser receives a bona fide offer from a third party to purchase gas
produced from the Interests for a term of greater than six months, BRTI shall
have a right of first refusal for five business days to purchase such gas upon
the same terms contained in such offer.





                                       20
<PAGE>   21
         Except as otherwise provided in the Purchase Agreement, if all of the
conditions to Closing described in the Purchase Agreement have not been
satisfied or waived by the respective parties on or before April 1, 1999 (or
such later date as may be mutually agreed upon by the parties in writing), the
Purchase Agreement will terminate; provided, however, the Purchase Agreement
shall not terminate automatically on April 1, 1999 if (i) the conditions to
closing set forth in the Purchase Agreement have not been satisfied solely
because the transactions contemplated by the Purchase Agreement are still
pending approval or clearance from the Commission or other regulatory agency,
or (ii) such approvals or clearances have been received, but because of the
delay involved in obtaining such approvals or clearances, adequate time does
not remain to accomplish the steps subsequent to receiving such approvals or
clearances necessary for all such conditions to have been met.  Each party will
remain liable for any willful failure to satisfy any conditions to Closing
required to be satisfied by it or for such party's breach of any of its
representations, covenants or other obligation contained in the Purchase
Agreement.  In addition, if the Purchaser fails to timely initiate proceedings
to terminate or liquidate the Trust in accordance with Article VIII and
Sections 9.02 and 9.03 of the Trust Agreement, the Purchaser is required to pay
to BROG $2,000,000 as liquidated damages.

         During the period from the date of the Purchase Agreement to Closing,
BROG has agreed to consult with the Purchaser with respect to matters
concerning the Interests, including certain authorizations for expenditures,
and with respect to all other material decisions to be made with respect to the
Interests.

         In accordance with Section 8.02 of the Trust Agreement, the Purchaser
agreed that, in its capacity as an owner of Units, it will call a meeting (or
request that a meeting be called) of the holders of Units (the "Unitholder
Meeting") to be held as soon as reasonably practicable under the circumstances
for the purpose of voting on the termination of the Trust in accordance with
Article VIII and Section 9.02 of the Trust Agreement.  Purchaser and BROG
further agreed that in connection with the Closing and as a result of the
termination of the Trust, the following events shall occur: (i) the Gas
Contract shall terminate as described herein, (ii) the Gathering Agreement
shall be amended as described herein, (iii) BROG and BRI shall assign their
rights and obligations under the Trust Agreement and the Administrative
Services Agreement to Purchaser and Purchaser shall assume such rights and
obligations, and (iv) the obligations of BRI under the Trust Agreement and the
Administrative Services Agreement (other than the obligations relating to the
windup of the Trust and any such obligations which by their express terms
survive the termination of the Trust) shall terminate and BRI shall be released
therefrom (the proposal to terminate the Trust and the events described in
clauses (i) through (iv) above being referred to herein as the "Termination
Proposal").

         In connection with this meeting, the Purchase Agreement contemplates
that the Purchaser will (i) prepare (or cause to be prepared) and use (alone or
with others) its commercially reasonable efforts to have cleared by the
Commission as promptly as practicable such information regarding the
Termination Proposal as is required to be included in a proxy or information
statement and all other proxy or informational materials to be filed with the
Commission for such meeting and (ii) otherwise comply with all legal
requirements applicable to it under federal (including, without limitation, the
Exchange Act), state or local law and





                                       21
<PAGE>   22
of The New York Stock Exchange, Inc. applicable to it (including without
limitation, the requirements applicable to it arising under the Trust
Agreement).  The Purchase Agreement provides that such filed material will
include a statement that the Purchaser intends to vote its Units and the Units
for which it controls the voting rights at the Unitholder Meeting "for"
approval of the Termination Proposal.

         BROG has agreed that BROG shall notify the Trustee in writing pursuant
to the Trust Agreement, to prepare and file with the Commission, use its
commercially reasonable efforts to have cleared by the Commission and
thereafter mail to the Unitholders a definitive proxy or information statement
of the Trust that includes the Termination Proposal.  Purchaser has agreed to
take appropriate actions to respond to comments from the Commission to any such
filing and BROG has agreed to notify the Trustee in writing to file same.  The
Purchase Agreement provides that when the statement has been cleared by the
Commission for mailing, BROG (upon Purchaser's request) shall notify the
Trustee in writing to mail the definitive Proxy Statement to the Trust
Unitholders as of the applicable record date.

         The Purchaser has agreed to use its reasonable best efforts to assure
under the circumstances that, the proxy or information statement and any
amendments or supplements thereto will, when filed, comply as to form in all
material respects with the  requirements of the Exchange Act applicable to the
Purchaser.  The Purchaser will also use its reasonable best efforts to assure
under the circumstances that, at the time the proxy or information statement or
any amendment or supplement thereto is first mailed to the Unitholders and at
the time such Unitholders vote on the approval of the termination of the Trust,
the Proxy Statement, as supplemented or amended, if applicable, will, to the
Purchaser's knowledge, not contain any untrue statement of a material fact or
omit to state any material fact necessary in order to make the statements
contained therein, in the light of the circumstances under which they were
made, not misleading.  These representations and warranties, however, do not
apply to statements or omissions included in the Proxy Statement or any
amendment or supplement thereto based upon information furnished to the
Purchaser by BROG or any other person for use (or incorporation by reference)
therein.

         The Purchase Agreement provides that Purchaser shall pay all
reasonable costs (other than legal fees and expenses incurred by the Trustee or
the Trust) incurred by the BROG, BRI and their respective affiliates related to
the preparation of the proxy or information statement or any other document
that is required to be filed on behalf of the Trust with the Commission or
mailed to Unitholders in connection with the transactions contemplated hereby.

         From the date of the Purchase Agreement until its termination, BROG
has agreed that it will not, and will use its commercially reasonable efforts
to cause its officers, directors, employees, financial or legal advisors not
to, directly or indirectly, (i) take any action to solicit, initiate or
encourage any proposal to acquire from BROG the Interests, or any interest
therein, (ii) engage in negotiations with, or disclose any nonpublic
information relating to the Interests or afford access to the properties, books
or records of BROG or any of its subsidiaries to, any person that may be
considering making, or has made, a proposal to acquire the Interests, or (iii)
exercise its right under Section 9.03(c) of the Trust Agreement to make a cash
offer to purchase all of the Remaining Royalty Interests (as defined in the





                                       22
<PAGE>   23
Trust Agreement) at any time prior to the sixtieth day following the date of
the Unitholder Meeting at which the Unitholders approve the termination of the
Trust.  BROG has agreed in the Purchase Agreement that it will, and will cause
its directors, employees, officers and financial and legal advisors to, cease
immediately and cause to be terminated all activities, discussions or
negotiations, if any, with any persons conducted heretofore with respect to any
proposal by any person to acquire the Interests, or any interest therein.

         In addition to the foregoing, to the extent the amount of certain
"Price Credits" in the "Price Credit Accounts" under the Gas Contract decrease
at certain points in time from the Effective Time through the Gas Contract
termination date, BRTI shall pay to Purchaser an amount equal to such
difference.  If such amount of  Price Credits have increased at such points in
time during such time period, Purchaser shall pay to BRTI an amount equal to
such difference.

         A copy of the Purchase and Sale Agreement is included in this filing
as an exhibit, and all references to the Purchase and Sale Agreement herein are
qualified in their entirety by reference to such Agreement.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS

                 (a)(18)  Purchase and Sale Agreement, dated October 21, 1998,
                          by and between Burlington Resources Oil & Gas
                          Company, a Delaware corporation, and San Juan
                          Partners, L.L.C., a Texas limited liability company.

                 (b)(2)   Second Amendment to Loan Agreement, dated October 9,
                          1998, by and between San Juan Partners, L.L.C. and
                          Bank One, Texas, N.A.





                                       23
<PAGE>   24
                                  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: October 26, 1998                 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: /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:  Managing Director
                                     
                                     
                                     ECIC CORPORATION
                                     
                                     
                                     By: /s/ ROBERT L. ZORICH
                                        ----------------------------------------
                                     Name:   Robert L. Zorich
                                     Title:  Managing Director
                                     
                                     
                                     
                                     BOCP ENERGY PARTNERS, L.P.
                                     
                                     

                                     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




                                       24
<PAGE>   25
  
                                     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>   26
                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
Exhibit
Number                    Description
- -------                   -----------
<S>                       <C>
99.(a)(18)                Purchase and Sale Agreement, dated October 21, 1998,
                          by and between Burlington Resources Oil & Gas
                          Company, a Delaware corporation, and San Juan
                          Partners, L.L.C., a Texas limited liability company.

99.(b)(2)                 Second Amendment to Loan Agreement, dated October 9,
                          1998, by and between San Juan Partners, L.L.C. and
                          Bank One, Texas, N.A.

</TABLE>







<PAGE>   1
                                                               EXHIBIT 99(a)(18)


                           PURCHASE AND SALE AGREEMENT

THIS AGREEMENT dated this 21st day of October, 1998, is between BURLINGTON
RESOURCES OIL & GAS COMPANY, a Delaware corporation ("Seller") with offices at
5051 Westheimer, Suite 1400, Houston, Texas 77056-2124, and SAN JUAN PARTNERS,
L.L.C., a Texas limited liability company ("Buyer"), with offices at 910 Travis
Street, Suite 2150, Houston, Texas 77002.

WHEREAS, Seller desires to sell, and Buyer desires to purchase, upon and subject
to the terms and conditions hereinafter set forth, all of Seller's right, title,
and interest in and to the following assets:

         (i)      The oil and gas leases, leasehold interests, overriding
                  royalty interests, rights and interests attributable or
                  allocable to that certain Northeast Blanco Unit Agreement
                  dated July 16, 1951, recorded in Book 182, Page 52 of the
                  records of San Juan County, New Mexico and in Volume 11, Page
                  361 of the records of Rio Arriba County, New Mexico (the "Unit
                  Agreement") and that certain Northeast Blanco Unit Operating
                  Agreement dated July 16, 1951, as amended on May 14, 1959 and
                  January 24, 1991 (the "Unit Operating Agreement"), and other
                  properties and interests described on Exhibit "A" Part I and
                  Part II attached hereto, insofar and only insofar as the
                  foregoing leases, rights, interests and properties cover the
                  coal seams with vertical limits comprising all coal seams
                  within the equivalent of the stratigraphic interval from 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 Com "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 (the "Fruitland coal formation"), and limited as to the
                  interests, lands and depths indicated in the Exhibit "A",
                  (collectively, the "Leases"), together with Seller's
                  right, title and interest in and to 

<PAGE>   2

                  the property and rights incident thereto, including, but not
                  limited to, as of the Effective Time, rights in, to, and under
                  agreements, leases, permits, rights-of-way, easements,
                  licenses, farmouts, farmins, options, orders, and other
                  contracts or agreements of a similar nature in any way
                  relating thereto;

         (ii)     The wells, equipment, materials, fixtures and improvements on
                  the Leases as of the Effective Time, appurtenant thereto or
                  used or obtained in connection with the Leases or with the
                  production, treatment, sale or disposal of hydrocarbons or
                  waste produced therefrom or attributable thereto, and other
                  appurtenances thereunto belonging (the "Equipment"); provided,
                  however, Equipment shall not include leased equipment located
                  on the Leases;

         (iii)    The Unit Agreement and the Unit Operating Agreement, together
                  with any right, title and interest created thereby in the
                  Leases insofar and only insofar as same cover the Fruitland
                  coal formation;

         (iv)     Gas purchase contracts, product purchase and sale agreements,
                  gas gathering agreements and gas processing agreements related
                  to the Leases (to the extent same are assignable) including,
                  but not limited to, that certain Gas Purchase Contract dated
                  effective May 1, 1993, by and between Meridian Oil Trading
                  Inc. and Meridian Oil Production Inc. (the "Gas Contract");

         (v)      Equipment leases and rental contracts related to the
                  Interests, if any, to the extent the same are assignable;

         (vi)     The rights and interests of Seller, if any, under that certain
                  Trust Agreement of Burlington Resources Coal Seam Gas Royalty
                  Trust dated as of May 1, 1993 among Meridian Oil Production
                  Inc., Burlington Resources Inc., Mellon Bank (DE) National
                  Association and NationsBank of Texas, N.A. (the "Trust
                  Agreement") to the extent same are assignable; and

                                      -2-
<PAGE>   3

         (vii)    The rights and interests of Seller, if any, as assignor under
                  that certain Net Profits Interest Conveyance dated effective
                  May 1, 1993, from Meridian Oil Production Inc. to the
                  Burlington Resources Coal Seam Gas Royalty Trust ("BRU")
                  recorded in Book 1164, Page 465 of the records of San Juan
                  County, New Mexico and in Book 142, Page 469 of the records of
                  Rio Arriba County, New Mexico (the "Net Profits Conveyance").

Seller's interests in these assets is herein collectively referred to as the
"Interests"; provided, however, that this Agreement shall not include and there
is excepted and reserved by Seller (i) such portion of the Interests as is
necessary or convenient to the possession, exploration, production, operation,
ownership, maintenance and enjoyment of any interests in the lands covered by
the Leases which interests are not covered hereby, to the extent and only to the
extent such reserved interests do not unreasonably interfere with Buyer's
continued ownership, use, operation and maintenance of the Interests and (ii)
those interests described on Exhibit "A" Part III attached hereto.

NOW, THEREFORE, in consideration of the above recitals and of the covenants and
agreements herein contained, Seller and Buyer agree as follows:

1.       Purchase and Sale. Subject to and upon all of the terms and conditions
         herein set forth, Seller shall sell, transfer, assign, convey, and
         deliver the Interests to Buyer, and Buyer shall purchase, receive, pay
         for, and accept the Interests from Seller, effective July 1, 1998, 7
         a.m. M.S.T. (the "Effective Time").

2.       Purchase Price. The purchase price for the Interests shall be TWENTY
         MILLION SEVEN HUNDRED AND FIFTY THOUSAND DOLLARS ($20,750,000) (the
         "Base Purchase Price"), subject to any applicable purchase price
         adjustment as provided for herein. Buyer and Seller agree that the Base
         Purchase Price shall be allocated among the Interests as set forth in
         Exhibit "B" for the purpose of establishing a basis for certain 


                                      -3-
<PAGE>   4

          taxes and determining the value of a Title Defect or an Environmental
          Defect and handling those instances in which the Base Purchase Price
          is to be adjusted.

3.        Title Defects.

         (a)      As used herein, the term "Defensible Title" shall mean, as to
                  the Interests, such title held by Seller, that, subject to and
                  except for Permitted Encumbrances (as hereinafter defined):

                  (i)      Entitles Seller to receive not less than the "Net
                           Revenue Interest" as set forth in Exhibit "B" of all
                           oil, gas, and associated liquid and gaseous
                           hydrocarbons produced, saved, and marketed from the
                           Interests from the Effective Time throughout the life
                           of the Interests;

                  (ii)     Obligates Seller to bear costs and expenses relating
                           to the maintenance, development, and operation of all
                           wells located on the Interests in an amount not
                           greater than the "Working Interest" set forth in
                           Exhibit "B", unless there is at least a proportionate
                           increase in the Net Revenue Interest; and

                  (iii)    Is free and clear of any and all encumbrances,
                           charges and liens.

         (b) As used herein, the term "Permitted Encumbrances" shall mean:

                  (i)      Lessor's royalties, overriding royalties, production
                           payments, and reversionary interests if the net
                           cumulative effect of such burdens does not operate to
                           reduce the Net Revenue Interest of any Interest to
                           less than the Net Revenue Interest set forth in
                           Exhibit "B" from the Effective Time throughout the
                           life of the Interests, subject, however, to Section
                           (b)(ix) below;



                                      -4-
<PAGE>   5

                  (ii)     The Gas Contract and that certain Gas Gathering,
                           Dehydrating and Treating Agreement, as amended, dated
                           effective May 3, 1990, by and between Meridian Oil
                           Gathering Inc. and Meridian Oil Trading Inc. (the
                           "Gathering Agreement");

                  (iii)    Required third party consents to assignments and
                           similar agreements with respect to which (i) waivers
                           or consents are obtained from the appropriate
                           parties, or (ii) required notices have been given to
                           the holders of such rights and the appropriate time
                           period for asserting such rights has expired without
                           an exercise of such rights;

                  (iv)     Liens for taxes or assessments not due or not
                           delinquent on the Closing Date;

                  (v)      All rights to consent by, required notices to,
                           filings with, or other actions by governmental
                           agencies in connection with the sale or conveyance of
                           oil and gas leases or interests therein or sale of
                           production therefrom if the same are customarily
                           obtained subsequent to such sale or conveyance;

                  (vi)     Easements, rights-of-way, servitudes, permits,
                           surface leases, and other rights in respect of
                           surface operations on or over any of the Interests
                           which do not operate to interfere with current
                           operations on the Interests;

                  (vii)    Inchoate liens of operators relating to obligations
                           not yet due or pursuant to which Seller is not in
                           default, and materialmen's, mechanics', repairmen's,
                           or other similar inchoate liens or charges arising in
                           the ordinary course of business incidental to
                           construction, maintenance or operation of the
                           Interests that have not been perfected;



                                      -5-
<PAGE>   6

                  (viii)   Any Title Defects waived by Buyer pursuant to the
                           terms of this Agreement;

                  (ix)     The Net Profits Conveyance;

                  (x)      The Trust Agreement and that certain Administrative
                           Services Agreement dated effective May 1, 1993, by
                           and between Burlington Resources Inc. and BRU (the
                           "Administrative Services Agreement").

         (c)      The Interests shall be deemed to have a "Title Defect" if
                  Seller has less than Defensible Title to the Interests.

4.        Purchase Price Adjustments for Title Defects.

         (a)      Buyer may, by delivery of written notice to Seller of the
                  existence of an alleged Title Defect, request reduction of the
                  purchase price for the Interest affected. The Title Defect
                  notice shall clearly indicate the nature of the Title Defect,
                  the Interest to which it relates, an explanation of the Title
                  Defect including the supporting legal theories, the allocated
                  value of the Interest as to which all or some portion of which
                  is affected by the Title Defect, and the amount by which Buyer
                  believes the value of the affected Interest has been reduced
                  because of the Title Defect, with the computation and
                  information upon which Buyer's belief is based. In determining
                  whether a portion of an Interest contains a Title Defect, it
                  is the intent of the parties to include, when possible, only
                  that portion of such Interest materially and adversely
                  affected. If the value properly allocated to a Title Defect
                  cannot be determined directly from Exhibit "B" because the
                  Title Defect is included within, but does not totally
                  comprise, the Interest to which the allocated value relates,
                  Buyer and Seller shall attempt, where feasible, to
                  proportionately reduce the allocated value in Exhibit "B".



                                      -6-
<PAGE>   7

         (b)      The Title Defect notice by Buyer shall be delivered to Seller
                  on or before the Termination Date (as hereinafter defined),
                  except that Buyer shall, to the extent reasonably practicable
                  and in addition to the Title Defect notice, notify Seller
                  immediately as it becomes aware of Title Defects while
                  performing its due diligence review of the Interests. Title
                  Defect for which notice is not delivered on or before the
                  Termination Date shall be deemed waived for all purposes, and
                  Buyer shall thereafter have no right to claim Title Defects
                  for which notice has not been so provided; and in the event
                  any Title Defect notice is timely delivered, all other Title
                  Defects relating to the same Interest which are not claimed on
                  or before the Termination Date shall be deemed waived for all
                  purposes. Seller shall have the right, but not the obligation,
                  to attempt to cure any alleged Title Defect prior to Closing.
                  In the event Seller is unable or unwilling to cure an alleged
                  Title Defect, Buyer and Seller shall meet and use their
                  reasonable efforts to agree on the validity of the claim of
                  Title Defect and the amount of any required adjustment to the
                  Base Purchase Price. In evaluating the significance of a fact,
                  circumstance or condition for purposes of determining an
                  alleged Title Defect, due consideration shall be given to the
                  length of time that the particular Lease has been producing
                  hydrocarbon substances and whether such fact, circumstance or
                  condition is of the type expected to be encountered in the
                  area involved, and is usual and customarily acceptable to
                  reasonable and prudent persons engaged in the business of the
                  ownership, development, and operation of oil and gas
                  properties with knowledge of all of the facts and appreciation
                  of their legal significance.

         (c)      In the event the parties cannot mutually agree on an
                  adjustment to the Base Purchase Price for an alleged Title
                  Defect, either Buyer or Seller shall give the other written
                  notice of intention to refer the matter to a mutually
                  agreeable third party independent reservoir engineer (the
                  "Determiner") to resolve the dispute in light of all relevant
                  circumstances. In the event Seller and Buyer are unable to
                  agree within five (5) business days after receipt of such
                  notice, then the matter


                                      -7-
<PAGE>   8

                  shall be so referred and the amount of the appropriate 
                  adjustment to the Base Purchase Price shall be determined 
                  solely by the Determiner. The parties shall submit all 
                  relevant information available to the Determiner within 
                  fifteen (15) days after the date of such referral and may 
                  submit position papers on the subject to the Determiner
                  within  such period, but not thereafter. Both parties shall
                  be bound  by the decision of the Determiner. The Base
                  Purchase Price  shall be reduced by the amount agreed upon by
                  the parties or established by the Determiner, as the case may
                  be. The fees and expenses of such third party determination
                  shall be borne equally by Buyer and Seller.

         (d)      There shall be no adjustment to the Base Purchase Price for
                  Title Defects unless the aggregate total of all adjustments to
                  the Base Purchase Price for Title Defects exceeds FIFTY
                  THOUSAND DOLLARS ($50,000) and thereafter, only to the extent
                  of such excess.

         (e)      In the event that Buyer shall determine that Seller's Net
                  Revenue Interests in the Interests are greater than the Net
                  Revenue Interests set forth on Exhibit "B", Buyer shall notify
                  Seller and Seller shall be entitled to a mutually agreeable
                  upward adjustment to the Base Purchase Price.

5.       Conditions of Closing by Seller. The obligation of Seller to close is
         subject to the satisfaction of the following conditions:

         (a)      The representations of Buyer contained in this Agreement shall
                  be true in all material respects on and as of the Closing
                  Date, and Buyer shall have performed materially all covenants
                  required by this Agreement to be performed at or prior to
                  Closing;

         (b)      Buyer shall have delivered to Seller a legal opinion rendered
                  by counsel to Buyer to the effect that (i) Buyer is a limited
                  liability company validly existing and in 


                                      -8-
<PAGE>   9

                  good standing under the laws of the State of Texas and has all
                  requisite limited liability company power and authority to
                  execute and deliver this Agreement and to consummate the
                  transactions contemplated hereby; (ii) the execution and
                  delivery of, and consummation of the transactions contemplated
                  by, this Agreement by Buyer have been duly authorized by all
                  necessary action on the part of the Buyer; and (iii) this
                  Agreement has been duly executed and delivered by Buyer and
                  constitutes a legal, valid and binding obligation of Buyer and
                  is enforceable against Buyer in accordance with its terms,
                  except that such enforcement may be subject to bankruptcy,
                  insolvency, moratorium or similar laws affecting creditors'
                  rights and to general principles of equity, and further
                  subject to the qualification that indemnification against
                  securities laws liabilities may violate public policy;

         (c)      Adjustments to the Base Purchase Price under the terms of this
                  Agreement shall not have exceeded FOUR MILLION DOLLARS
                  ($4,000,000);

         (d)      All of the obligations (other than the obligations relating to
                  the wind-up of BRU and any such obligations which by their
                  express terms survive the termination of BRU) of BRI under (i)
                  the Trust Agreement and (ii) the Administrative Services
                  Agreement, including, without limitation, BRI's obligations
                  under Article X of the Trust Agreement, shall have terminated;

         (e)      There shall be no pending legal or equitable action seeking to
                  enjoin, prohibit or declare illegal the purchase and sale of
                  the Interests as contemplated by this Agreement; and

         (f)      All consents, approvals and waivers required to be obtained in
                  order to consummate the transactions contemplated hereby shall
                  have been obtained, other than consents and approvals by,
                  required notices to, and filings with governmental 


                                      -9-
<PAGE>   10

                  authorities that are customarily obtained after the
                  consummation of transactions of the type contemplated hereby.

6.       Conditions of Closing by Buyer. The obligation of Buyer to close is
         subject to the satisfaction of the following conditions:

         (a)      The representations of Seller contained in this Agreement
                  shall be true in all material respects on and as of the
                  Closing Date, and Seller shall have performed materially all
                  covenants required by this Agreement to be performed by Seller
                  at or prior to Closing;

         (b)      Buyer and Seller shall have adjusted the Base Purchase Price
                  in accordance with the provisions of this Agreement;

         (c)      Seller shall have delivered to Buyer a legal opinion rendered
                  by Seller's corporate counsel to the effect that (i) Seller is
                  a corporation validly existing and in good standing under the
                  laws of the State of Delaware and has all requisite power and
                  authority to execute and deliver this Agreement and to
                  consummate the transactions contemplated hereby; (ii) the
                  execution and delivery of, and consummation of the
                  transactions contemplated by, this Agreement by Seller have
                  been duly authorized by all necessary action on the part of
                  Seller; and (iii) this Agreement has been duly executed and
                  delivered by Seller and constitutes a legal, valid and binding
                  obligation of Seller and is enforceable against Seller in
                  accordance with its terms, except that such enforcement may be
                  subject to bankruptcy, insolvency, moratorium or similar laws
                  affecting creditors' rights and to general principles of
                  equity;

         (d)      Seller shall have delivered to Buyer a legal opinion rendered
                  by Seller's Delaware counsel in substantially the form
                  attached hereto as Exhibit "C";




                                      -10-
<PAGE>   11

         (e)      There shall be no pending legal or equitable action seeking to
                  enjoin, prohibit or declare illegal the purchase and sale of
                  the Interests as contemplated by this Agreement; and

         (f)      All consents, approvals and waivers required to be obtained in
                  order to consummate the transactions contemplated hereby shall
                  have been obtained, other than consents and approvals by,
                  required notices to, and filings with governmental authorities
                  that are customarily obtained after the consummation of
                  transactions of the type contemplated hereby.

7.       Representations of Seller. Seller represents to Buyer that:

         (a)      Seller is a corporation validly existing and in good standing
                  under the laws of the State of Delaware and is duly qualified
                  to own its properties and assets and to carry on its business
                  as now being conducted;

         (b)      Seller has the requisite power and authority to execute and
                  deliver this Agreement and to consummate the transactions
                  contemplated hereby, and the execution and delivery of this
                  Agreement by Seller and the consummation of the transactions
                  contemplated hereby have been duly authorized;

         (c)      This Agreement has been duly executed and delivered by Seller
                  and constitutes the valid and binding obligation of Seller,
                  enforceable against it in accordance with the terms hereof,
                  subject to the effects of bankruptcy, insolvency,
                  reorganization, moratorium, and similar laws affecting
                  creditors' rights, and no other act, approval or proceeding on
                  the part of Seller or any other party is required to authorize
                  the execution and delivery of this Agreement by Seller or the
                  consummation of the transactions contemplated hereby (other
                  than consents and




                                      -11-
<PAGE>   12


                  approvals required under the Trust Agreement or the
                  Administrative Services Agreement and any consents or
                  approvals set forth on Exhibit "D-1" hereto);

         (d)      This Agreement, and the execution and delivery hereof by
                  Seller, does not and the consummation of the transactions
                  contemplated hereby will not (i) conflict with or result in a
                  breach of the charter or bylaws of Seller or any other
                  governing documents of Seller, (ii) violate, or conflict with,
                  or constitute a default under, or result in the creation or
                  imposition of any security interest, lien or encumbrance upon
                  any property or assets of Seller under any mortgage, indenture
                  or agreement to which it is a party or by which the Interests
                  are bound, which violation, conflict or default might
                  adversely affect the ability of Seller to perform its
                  obligation under this Agreement, or (iii) violate any statute
                  or law or any judgment, decree, order, writ, injunction,
                  regulation or rule of any court or governmental authority,
                  which violation might adversely affect the ability of Seller
                  to perform its obligations under this Agreement;

         (e)      Seller has incurred no liability, contingent or otherwise, for
                  brokers' or finders' fees relating to the transactions
                  contemplated by this Agreement for which Buyer shall have any
                  responsibility whatsoever;

         (f)      Seller is not a "foreign person" as defined in Section 1445 of
                  the Internal Revenue Code of 1986 and in any regulations
                  promulgated thereunder;

         (g)      Except as set forth on Exhibit "D-2" attached hereto, to the
                  best of Seller's knowledge after a review of the Records,
                  there are no suits or proceedings (including condemnation or
                  similar proceedings) filed or threatened against the Interests
                  or any portion thereof that would have a material adverse
                  affect on the value or operation of the Interests; and


                                      -12-
<PAGE>   13


         (h)      Except as set forth on Exhibit "D-2" attached hereto, none of
                  the Interests are encumbered by take-or-pay or other similar
                  arrangements with purchasers of oil or gas whereby Seller is
                  obligated (i) to deliver production without receiving payment
                  therefor, or (ii) to repay monies received for production paid
                  for but not taken; and

         (i)      To the best of Seller's knowledge, Seller has not violated any
                  laws, statutes, regulations or orders applicable to any of the
                  Interests or the operation thereof which violation (i) would
                  have a material adverse affect on the value or operation of
                  the affected Interests or (ii) has not been remedied.

         In those instances where Seller's representations are made on the basis
         of "the best of Seller's knowledge", such representations are made by
         Seller on the basis of the actual knowledge of Seller's personnel at or
         above the supervisory level without any investigation. If such
         personnel have notice of material facts which should cause them to
         reasonably believe that an investigation should be conducted, then such
         personnel shall be deemed to have actual knowledge of the facts that
         would have been uncovered by such an investigation.

8.       Representations of Buyer. Buyer represents to Seller that:

         (a)      Buyer is a limited liability company validly existing and in
                  good standing under the laws of the State of Texas and is duly
                  qualified to own its properties and assets and to carry on its
                  business as now being conducted;

         (b)      Buyer has the requisite power and authority to execute and
                  deliver this Agreement and to consummate the transactions
                  contemplated hereby. The execution and delivery of this
                  Agreement by Buyer and the consummation of the transactions
                  contemplated hereby have been duly authorized;



                                      -13-
<PAGE>   14

         (c)      This Agreement has been duly executed and delivered by Buyer
                  and constitutes the valid and binding obligation of Buyer,
                  enforceable against it in accordance with the terms hereof,
                  subject to the effects of bankruptcy, insolvency,
                  reorganization, moratorium, and similar laws affecting
                  creditors' rights. No other act, approval or proceeding on the
                  part of Buyer or any other party is required to authorize the
                  execution and delivery of this Agreement by Buyer or the
                  consummation of the transactions contemplated hereby (other
                  than consents and approvals required under the Trust Agreement
                  or the Administrative Services Agreement);

         (d)      This Agreement, and the execution and delivery hereof by
                  Buyer, does not and the consummation of the transactions
                  contemplated hereby will not (i) conflict with or result in a
                  breach of the governing documents of Buyer, or (ii) violate
                  any statute or law or any judgment, decree, order, writ,
                  injunction, regulation or rule of any court or governmental
                  authority, which violation might adversely affect the ability
                  of Buyer to perform its obligations under this Agreement;

         (e)      Buyer possesses all required governmental licenses, permits,
                  bonds, certificates, orders, and authorizations necessary to
                  own or operate the Interests;

         (f)      Buyer will have on the Closing Date and thereafter, sufficient
                  cash to enable it to make payment in immediately available
                  funds of the purchase price when due and any other amounts to
                  be paid by it hereunder;

         (g)      Buyer is an experienced and knowledgeable investor in the oil
                  and gas business. Buyer is not acquiring the Interests in
                  connection with a distribution or resale thereof in violation
                  of federal or state securities laws and the rules and
                  regulations thereunder;



                                      -14-
<PAGE>   15


         (h)      Buyer has incurred no liability, contingent or otherwise, for
                  brokers' or finders' fees relating to the transactions
                  contemplated by this Agreement for which Seller shall have any
                  responsibility whatsoever; and

         (i)      As of October 15, 1998, Buyer is the beneficial owner of or
                  has voting control over 5,867,968 Trust Units ("BRU Units") of
                  BRU, which constitutes approximately 66.68145% of the total
                  number of BRU Units reported by BRU to be outstanding as of
                  such date and Buyer will not sell, transfer, relinquish voting
                  control over or otherwise dispose of, any of such BRU Units
                  prior to Closing.

9.        Claims.

         (a)      "Claims" shall mean any and all claims, losses, damages,
                  costs, expenses, diminutions in value, suits, causes of action
                  or judgments of any kind or character with respect to any and
                  all liabilities and obligations or alleged or threatened
                  liabilities and obligations, including, but not limited to,
                  any interest, penalty, and any attorneys' fees and other costs
                  and expenses incurred in connection with investigating or
                  defending any claims or actions, whether or not resulting in
                  any liability.

         (b)      "Environmental Law" shall mean any statute, rule, regulation
                  or order of any governmental agency having jurisdiction over
                  the Interests or Seller pertaining to health, safety or the
                  environment.

         (c)      An "Environmental Defect" shall mean a Claim attributable to
                  or arising out of (i) personal injury, death and/or property
                  damages resulting from the release of any substance related to
                  the Interests deemed to be hazardous under any Environmental
                  Law in effect on the Effective Time or (ii) a violation of any
                  Environmental Law in effect on the Effective Time and
                  applicable to conditions




                                      -15-
<PAGE>   16

                  existing prior to the Closing Date, in each case, that is
                  known by or made known to Buyer prior to Closing.

         (d)      An "Environmental Claim" shall mean a Claim attributable to or
                  arising out of (i) personal injury, death and/or property
                  damages resulting from the release of any substance related to
                  the Interests deemed to be hazardous under any Environmental
                  Law in effect on the Effective Time, or (ii) a violation of
                  any Environmental Law in effect on the Effective Time and
                  applicable to conditions of the Interests existing prior to
                  the Closing Date, in each case, that is known by or made known
                  to Buyer after the Closing.

10.       Retained Obligations and Indemnities of Seller.

         (a)      As of the Closing Date, Seller agrees to retain and perform
                  (except to the extent expressly assumed by Buyer under Section
                  11 hereof) any and all of the liabilities and obligations or
                  alleged or threatened liabilities and obligations of Seller
                  (i) that relate to periods prior to the Effective Time and
                  arise under the Trust Agreement or the Net Profits Conveyance;
                  (ii) that relate to periods prior to the Effective Time and
                  that arise under the existing oil and gas leases, assignments,
                  deeds, operating agreements, leases, permits, rights-of-way,
                  licenses, easements, options, orders, gas purchase contracts,
                  product purchase and sale agreements, gas gathering
                  agreements, gas processing agreements, or any other agreements
                  or contracts attributable to, affecting, or otherwise relating
                  to the Interests, including, but not limited to, any and all
                  liabilities and obligations to pay and deliver royalties,
                  overriding royalties, non-participating royalties, payments
                  due under the Net Profits Conveyance, and other burdens on
                  production, and (iii) that relate to the gross negligence or
                  willful misconduct of Seller during the period between the
                  Effective Time and the Closing Date.




                                      -16-
<PAGE>   17


         (b)      Seller shall, to the fullest extent permitted by law, protect,
                  defend, indemnify, and hold Buyer and its affiliates,
                  including its directors, officers, employees, shareholders,
                  partners, agents, and representatives of each of them and each
                  person who controls or is controlled by Buyer, harmless from
                  and against any and all Claims attributable to or arising out
                  of (i) the ownership or operation of the Interests prior to
                  the Effective Time, (ii) Seller's retention of any obligation
                  or liability contained in this Section 10, (iii) the breach by
                  Seller of the representations contained in Section 7 hereof,
                  (iv) the matters set forth in Exhibit "D-2" hereto, and (v)
                  the breach by Seller of any of the agreements and covenants
                  contained in this Agreement; provided, however, this indemnity
                  is limited and shall not cover or include (x) matters
                  pertaining to title to the Interests, all of which will be
                  governed by Section 4 hereof and the limited warranty of title
                  to be contained in the conveyance documents to be delivered
                  hereunder at the Closing, (y) any Claims with respect to any
                  and all gas balancing liabilities and obligations or alleged
                  or threatened gas balancing liabilities and obligations, all
                  of which will be governed by Section 14 hereof, or (z) any
                  Claims with respect to any violation of Environmental Laws
                  (regardless of the dollar amount in issue) waived pursuant to
                  Section 13 hereof or any other Claims relating to the
                  Interests (including Environmental Claims) expressly assumed
                  by Buyer under Section 11 hereof.

         (c)      After Closing, any assertion by Buyer that Seller is liable
                  under the terms of the indemnities provided by Section 10(b)
                  shall state the facts known to Buyer that give rise to such
                  notice in sufficient detail to allow Seller to evaluate the
                  assertion.

         (d)      Promptly after receipt by Buyer under this Section 10 of
                  notice of any claim or the commencement of any action, Buyer
                  shall, if a claim in respect thereof is to be made against
                  Seller under this Section 10, notify Seller in writing of the
                  claim or the commencement of that action; provided, however,
                  that the failure to notify Seller shall not relieve Seller
                  from any liability which it may have under this 


                                      -17-
<PAGE>   18

                  Section 10 except to the extent Seller has been materially
                  prejudiced by such failure and, provided further, that the
                  failure to notify Seller shall not relieve Seller from any
                  liability which it may have to Buyer otherwise than under this
                  Section 10. If any such claim or action shall be brought
                  against Buyer, and Buyer shall notify Seller thereof, Seller
                  shall be entitled to participate therein and, to the extent
                  that it wishes, to assume the defense thereof with counsel
                  satisfactory to Buyer. After notice from Seller to Buyer of
                  its election to assume the defense of such claim or action,
                  Seller shall not be liable to Buyer under this Section 10 for
                  any legal or other expenses subsequently incurred by Buyer in
                  connection with the defense thereof other than reasonable
                  costs of investigation; provided, however, that Buyer shall
                  have the right to employ counsel if, (i) the employment of
                  such counsel shall have been authorized by Seller in
                  connection with the defense of such action, (ii) Seller shall
                  not have engaged counsel reasonably promptly to take charge of
                  the defense of such action or (iii) counsel shall have
                  reasonably concluded that there may be defenses available to
                  Buyer that are in addition to or in conflict with those
                  available to Seller, and, in that event, the fees and expenses
                  of such separate counsel shall be paid by Seller; provided,
                  further, that in connection with any proceedings or related
                  proceedings in the same jurisdiction, Seller shall not be
                  liable for the legal fees and expenses of more than one
                  separate firm of attorneys (in addition to any local counsel).
                  Seller shall not (i) without the prior written consent of
                  Buyer (which consent shall not be unreasonably withheld),
                  settle or compromise or consent to the entry of any judgment
                  with respect to any pending or threatened claim, action, suit
                  or proceeding in respect of which indemnification or
                  contribution may be sought hereunder (whether or not Buyer is
                  an actual or potential party to such claim or action) unless
                  such settlement, compromise or consent includes an
                  unconditional release of Buyer from all liability arising out
                  of such claim, action, suit or proceeding, or (ii) be liable
                  for any settlement of any such action effected without its
                  written consent (which consent shall not be unreasonably
                  withheld), but if settled with its written consent or if there
                  be a final judgment of the plaintiff in any such action,
                  Seller 


                                      -18-
<PAGE>   19

                  agrees to indemnify and hold harmless Buyer from and against
                  any loss of liability by reason of such settlement or
                  judgment.

11.       Assumption of Obligations and Indemnities of Buyer.

         (a)      As of the Closing Date, Buyer agrees to assume and perform
                  (except to the extent expressly retained by Seller under
                  Section 10(a) (iii) hereof) any and all of the liabilities and
                  obligations or alleged or threatened liabilities and
                  obligations of Seller that pertain to the ownership and
                  operation of the Interests (i) that relate to periods after
                  the Effective Time and arise under the Trust Agreement or the
                  Nets Profits Conveyance; (ii) that relate to periods after the
                  Effective Time and that arise under the existing oil and gas
                  leases, assignments, deeds, operating agreements, leases,
                  permits, rights-of-way, licenses, easements, options, orders,
                  gas purchase contracts, product purchase and sale agreements,
                  gas gathering agreements, gas processing agreements, or any
                  other agreements or contracts attributable to, affecting, or
                  otherwise relating to the Interests, including, but not
                  limited to, any and all liabilities and obligations to pay and
                  deliver royalties, overriding royalties, non-participating
                  royalties, payments due under the Net Profits Conveyance, and
                  other burdens on production, (iii) except as otherwise
                  provided in Section 14 hereof, in connection with or arising
                  out of balancing of overproduction or underproduction from the
                  Interests whether relating to periods before or after the
                  Effective Time, (iv) that relate to Environmental Claims, to
                  the extent the aggregate cost to remediate, correct or satisfy
                  such Environmental Claims does not exceed TWO HUNDRED FIFTY
                  THOUSAND DOLLARS ($250,000), net to Seller's interest in the
                  affected Interests, and (v) for any violation of Environmental
                  Laws waived pursuant to Section 13 hereof. As of the Closing
                  Date, Buyer agrees to assume and perform any and all of the
                  liabilities and obligations or alleged or threatened
                  liabilities and obligations of BRI that relate to periods
                  after the Effective Time and arise under the Trust Agreement
                  or the Administrative Services Agreement. Additionally, as of
                  the Closing Date, 


                                      -19-
<PAGE>   20

                  Buyer agrees to assume and perform any and all liabilities and
                  obligations to comply with all laws and governmental
                  regulations with respect to the Interests, including, but not
                  limited to, the lawful plugging and abandonment of oil and gas
                  wells and the restoration of the surface of the land, or any
                  governmental request or other requirement to abandon any
                  pipeline or facility or take any clean-up, remedial or other
                  action with respect to the Interests, relating to events which
                  occur after the Effective Time.

         (b)      Buyer shall, to the fullest extent permitted by law, protect,
                  defend, indemnify, and hold Seller, BRI and their respective
                  affiliates, directors, officers, employees, agents, and
                  representatives of each of them and each person who controls
                  or is controlled by Seller or BRI (the "Seller Parties"),
                  harmless from and against any and all Claims attributable to
                  or arising out of the following (i) the ownership or operation
                  of the Interests subsequent to the Effective Time, (ii)
                  Buyer's assumption of any obligation or liability contained in
                  this Section 11, (iii) the breach by Buyer of the
                  representations contained in Section 8 hereof, (iv) the breach
                  by Buyer of any of the agreements and covenants contained in
                  this Agreement, and (v) any act, omission, event, condition or
                  circumstance involving or relating to the Interests occurring
                  or existing before the Effective Time that was waived pursuant
                  to Section 13 hereof.

         (c)      Buyer shall, to the fullest extent permitted by law, protect,
                  defend, indemnify and hold the Seller Parties harmless from
                  and against any and all Claims attributable to or arising out
                  of any claims or actions by or through any holder of any
                  interest in BRU in connection with the transactions
                  contemplated hereby or the termination or liquidation of BRU
                  as contemplated hereby.

         (d)      Buyer shall to the fullest extent permitted by law, defend,
                  indemnify and hold the Seller Parties harmless from and
                  against any loss, claim, damage or liability, joint or
                  several, or any action in respect thereof, to which Seller,
                  its officers, employees 


                                      -20-
<PAGE>   21

                  or any controlling person becomes subject, under the
                  Securities Exchange Act of 1934, as amended, insofar as such
                  loss, claim, damage, liability or action arises out of, or is
                  based upon, (i) any untrue statement or alleged untrue
                  statement of a material fact contained in any preliminary or
                  definitive proxy statement, information statement, other
                  solicitation material or any other document filed by or on
                  behalf of Buyer with the SEC, or any other statement publicly
                  made by or on behalf of Buyer in connection with the
                  Termination Proposal (as hereinafter defined) by Buyer or any
                  actions taken by or behalf of Buyer after the termination of
                  BRU, or (ii) the omission or alleged omission to state in any
                  preliminary or definitive proxy statement, information
                  statement, other solicitation material or any other document
                  filed by or on behalf of Buyer with the SEC, or any other
                  statement publicly made by or on behalf of Buyer in connection
                  with the Termination Proposal by Buyer or any actions taken by
                  or on behalf of Buyer after the termination of BRU, any
                  material fact required to be stated therein or necessary to
                  make the statements therein not misleading; provided, however,
                  that Buyer shall not be liable in any case to the extent that
                  any such loss, claim, damage, liability or action arises out
                  of, or is based upon, (A) any fraudulent misrepresentation,
                  gross negligence or willful misconduct of Seller or (B) any
                  untrue statement or alleged untrue statement or omission or
                  alleged omission included in any such preliminary or
                  definitive proxy statement, information statement or other
                  solicitation material in reliance upon and in conformity with
                  written information furnished to Buyer or the trustee of BRU
                  by or on behalf of Seller or any third party specifically for
                  inclusion therein.

         (e)      EXCEPT AS OTHERWISE SPECIFICALLY SET FORTH HEREIN, THE
                  INDEMNIFICATION, RELEASE AND ASSUMPTION PROVISIONS PROVIDED
                  FOR IN THIS SECTION 11 SHALL BE APPLICABLE WHETHER OR NOT THE
                  CLAIMS, LOSSES, COSTS, EXPENSES AND DAMAGES IN QUESTION AROSE
                  SOLELY OR IN PART FROM THE GROSS, ACTIVE, PASSIVE,
                  COMPARATIVE, OR CONCURRENT 


                                      -21-
<PAGE>   22

                  NEGLIGENCE, STRICT LIABILITY OR OTHER FAULT OF THE SELLER
                  PARTIES.

         (f)      Promptly after receipt by Seller under this Section 11 of
                  notice of any claim or the commencement of any action, Seller
                  shall, if a claim in respect thereof is to be made against
                  Buyer under this Section 11, notify Buyer in writing of the
                  claim or the commencement of that action; provided, however,
                  that the failure to notify Buyer shall not relieve Buyer from
                  any liability which it may have under this Section 11 except
                  to the extent Buyer has been materially prejudiced by such
                  failure and, provided further, that the failure to notify
                  Buyer shall not relieve Buyer from any liability which it may
                  have to Seller otherwise than under this Section 11. If any
                  such claim or action shall be brought against Seller, and
                  Seller shall notify Buyer thereof, Buyer shall be entitled to
                  participate therein and, to the extent that it wishes, to
                  assume the defense thereof with counsel satisfactory to
                  Seller. After notice from Buyer to Seller of its election to
                  assume the defense of such claim or action, Buyer shall not be
                  liable to Seller under this Section 11 for any legal or other
                  expenses subsequently incurred by Seller in connection with
                  the defense thereof other than reasonable costs of
                  investigation; provided, however, that Seller shall have the
                  right to employ counsel if, (i) the employment of such counsel
                  shall have been authorized by Buyer in connection with the
                  defense of such action, (ii) Buyer shall not have engaged
                  counsel reasonably promptly to take charge of the defense of
                  such action or (iii) counsel shall have reasonably concluded
                  that there may be defenses available to Seller that are in
                  addition to or in conflict with those available to Buyer, and,
                  in that event, the fees and expenses of such separate counsel
                  shall be paid by Buyer; provided, further, that in connection
                  with any proceedings or related proceedings in the same
                  jurisdiction, Buyer shall not be liable for the legal fees and
                  expenses of more than one separate firm of attorneys (in
                  addition to any local counsel). Buyer shall not (i) without
                  the prior written consent of Seller (which consent shall not
                  be unreasonably withheld), settle or compromise or consent to
                  the entry of any judgment with 


                                      -22-
<PAGE>   23

                  respect to any pending or threatened claim, action, suit or
                  proceeding in respect of which indemnification or contribution
                  may be sought hereunder (whether or not Seller is an actual or
                  potential party to such claim or action) unless such
                  settlement, compromise or consent includes an unconditional
                  release of Seller from all liability arising out of such
                  claim, action, suit or proceeding, or (ii) be liable for any
                  settlement of any such action effected without its written
                  consent (which consent shall not be unreasonably withheld),
                  but if settled with its written consent or if there be a final
                  judgment of the plaintiff in any such action, Buyer agrees to
                  indemnify and hold harmless Seller from and against any loss
                  of liability by reason of such settlement or judgment.

         (g)      If the indemnification provided for in Sections 11(c) or 11(d)
                  hereof shall for any reason be unavailable to or insufficient
                  to hold harmless the Seller Parties in respect of any loss,
                  claim, damage or liability, or any action in respect thereof,
                  referred to therein, then Buyer shall, in lieu of indemnifying
                  the Seller Parties, contribute to the amount paid or payable
                  by the Seller Parties as a result of such loss, claim, damage
                  or liability, or action in respect thereof, in such proportion
                  as shall be appropriate to reflect the relative fault of Buyer
                  with respect to the statements or omissions which resulted in
                  such loss, claim, damage or liability, or action in respect
                  thereof, as well as any other relevant equitable
                  considerations. The relative fault shall be determined by
                  reference to whether the untrue or alleged untrue statement of
                  a material fact or omission or alleged omission to state a
                  material fact relates to information supplied by Buyer to the
                  Seller Parties.

12.       Due Diligence Review.

         (a)      Prior to Closing, Seller, in Seller's offices, will make
                  available to Buyer and Buyer's authorized representatives for
                  examination as Buyer may reasonably request, all lease files,
                  land files maintained in the ordinary course of business, well
                  files, product purchase and sale contracts, division order
                  files, abstracts, 


                                      -23-
<PAGE>   24
                  drilling or division order title opinions, engineering and
                  geological data, reports, maps, logs, well records and,
                  financial and accounting information contained in Seller's
                  files or to which Seller has reasonable access relating to the
                  Interests (collectively the "Records"); provided, however, the
                  Records shall not include any geophysical data or proprietary
                  analyses. Prior to Closing, Buyer, at Buyer's sole cost, may
                  copy any portion of the Records as Buyer may reasonably
                  request.

         (b)      Seller shall permit Buyer and Buyer's authorized
                  representatives to consult with Seller's employees during
                  reasonable business hours and shall assist Buyer in obtaining
                  access to the Interests to conduct, at Buyer's sole risk and
                  expense, wellsite inspections and inventories of the
                  Interests. During such inspections, Buyer shall have the right
                  to review the Interests to determine the environmental
                  condition of the Equipment and Lease premises.

13.       Purchase Price Adjustments for Environmental Defects.

         (a)      Buyer may, by delivery of written notice to Seller of the
                  existence of an alleged Environmental Defect, request
                  reduction of the Base Purchase Price for the Interest
                  affected. The Environmental Defect notice shall clearly
                  indicate the nature and a detailed description of the
                  Environmental Defect and the Environmental Law allegedly
                  violated, the Interest to which it relates, and the dollar
                  amount which Buyer believes it would take to rectify or
                  remediate the Environmental Defect.

         (b)      The Environmental Defect notice by Buyer shall be delivered to
                  Seller on or before the Termination Date except that Buyer
                  shall, to the extent reasonably practicable, and in addition
                  to the Environmental Defect notice, notify Seller immediately
                  as it becomes aware of an Environmental Defect while
                  performing its due diligence review of the Interests. Seller
                  shall have the right, but not the obligation, to attempt to
                  cure any alleged Environmental Defect prior to Closing. 


                                      -24-
<PAGE>   25

                  In the event Seller is unable or unwilling to cure an alleged
                  Environmental Defect, Buyer and Seller shall meet and use
                  their reasonable efforts to agree on the validity of the claim
                  of the Environmental Defect and the amount of any required
                  adjustment to the Base Purchase Price. Any Environmental
                  Defect existing with respect to the Interests as of the
                  Termination Date, and known by or made known to Buyer on or
                  before such date, but not included in an Environmental Defect
                  notice delivered by Buyer to Seller on or before such date
                  shall be deemed waived for all purposes and shall be assumed
                  by Buyer pursuant to Section 11 hereof.

         (c)      In the event the parties cannot mutually agree on an
                  adjustment to the Base Purchase Price for an alleged
                  Environmental Defect, either Buyer or Seller shall give the
                  other written notice of intention to refer the matter to a
                  mutually agreeable third party environmental expert (the
                  "Environmental Determiner") to resolve the dispute in light of
                  all relevant circumstances. In the event Seller and Buyer are
                  unable to agree within five (5) business days after such
                  notice, then the matter shall be so referred and the amount of
                  the appropriate adjustment to the Base Purchase Price shall be
                  determined solely by the Environmental Determiner. The parties
                  shall submit all relevant information available to the
                  Environmental Determiner within fifteen (15) days after the
                  date of such referral and may submit position papers on the
                  subject to the Environmental Determiner within such period,
                  but not thereafter. Both parties shall be bound by the
                  decision of the Environmental Determiner. The Base Purchase
                  Price shall be reduced by the amount agreed upon by the
                  parties or established by the Environmental Determiner, as the
                  case may be. The fees and expenses of such third party
                  determination shall be borne equally by Buyer and Seller.

         (d)      There shall be no purchase price adjustment for Environmental
                  Defects unless the aggregate total of all Environmental
                  Defects exceeds FIFTY THOUSAND DOLLARS ($50,000), net to
                  Seller's interest in the affected Interests and thereafter,
                  only to the extent of such excess.



                                      -25-
<PAGE>   26

14.      Gas Imbalances. Seller's estimate of the aggregate gas imbalance as of
         the Effective Time for all the Interests is 97,994 MCF, cumulative
         working interest underproduced (4,882 MCF net). On or before the
         Termination Date, Seller shall provide Buyer with a revised gas
         imbalance schedule for all the Interests as of the Effective Time.
         There shall be a purchase price adjustment at Closing for the imbalance
         calculated on Seller's Net Revenue Interest at a price equal to the
         average monthly San Juan Basin Index Price as published in Inside FERC
         for the periods from January 1, 1998 to June 30, 1998. To the extent
         that there is any difference between Seller's actual aggregate gas
         imbalance as of the Effective Time and the imbalance position settled
         at Closing, then an adjustment shall be made at the same price set
         forth in the previous sentence in the Final Closing Statement. There
         shall be no further gas imbalance adjustments after the Post-Closing
         adjustment. In the event of a Title Defect affecting all or a portion
         of the Interests, the aggregate gas imbalance shown above shall be
         adjusted to take into account the affected Interest. Any purchase price
         adjustments for gas imbalances shall be made only on those Interests
         purchased by Buyer.

15.       Other Purchase Price Adjustments.

         (a)      As used herein, the following terms have the meanings 
                  assigned:

                  "Casualty Loss" shall mean, with respect to all or any portion
                  of the Interests, any destruction by fire, blowout, storm or
                  other casualty of all or any portion of the Interests between
                  the Effective Time and Closing. Seller shall promptly notify
                  Buyer of any Casualty Loss of which Seller becomes aware.

                  "Required Consent" shall mean any rights to consent to an
                  assignment or transfer of a Lease, other than filings with
                  governmental entities or notices to third parties



                                      -26-
<PAGE>   27



                  customarily obtained subsequent to a sale or transfer, where
                  the failure to receive such consent could reasonably render
                  the transfer of such Lease to Buyer void or voidable.

         (b)      If any Casualty Loss occurs prior to Closing to any of the
                  Interests and such Casualty Loss may be repaired prior to
                  Closing and, when repaired, the value of such Interests shall
                  not be materially diminished, then Seller may repair such
                  Casualty Loss prior to Closing at Seller's cost and shall
                  notify Buyer of such election. In the event Seller (i) elects
                  to repair such Casualty Loss and such repair is not completed
                  prior to Closing or the repair completed by Seller does not
                  cause the value of such Interests to be substantially the same
                  as such value prior to the Casualty Loss, or (ii) is unable or
                  unwilling to repair the Casualty Loss, then Buyer and Seller
                  shall meet and use their reasonable efforts to agree on the
                  effect of the Casualty Loss and the amount of any required
                  adjustment to the Base Purchase Price. In the event the
                  parties cannot mutually agree on an adjustment to the Base
                  Purchase Price for the Casualty Loss, either Buyer or Seller
                  shall give the other written notice of intention to refer the
                  matter to a mutually agreeable third party expert (the
                  "Casualty Loss Determiner") to resolve the dispute in light of
                  all relevant circumstances. In the event Seller and Buyer are
                  unable to agree within five (5) business days after such
                  notice, then the matter shall be so referred and the amount of
                  the appropriate adjustment to the Base Purchase Price shall be
                  determined solely by the Casualty Loss Determiner. The parties
                  shall submit all relevant information available to the
                  Casualty Loss Determiner within fifteen (15) days after the
                  date of such referral and may submit position papers on the
                  subject to the Casualty Loss Determiner within such period,
                  but not thereafter. Both parties shall be bound by the
                  decision of the Casualty Loss Determiner. The Base Purchase
                  Price shall be reduced by the amount agreed upon by the
                  parties or established by the Casualty Loss Determiner, as the
                  case may be. The fees and expenses of such third party
                  determination shall be borne equally by Buyer and Seller.



                                      -27-
<PAGE>   28

         (c)      Seller shall promptly give notices to all third parties
                  holding any Required Consents known to Seller or identified to
                  Seller by Buyer prior to Closing. Seller shall use all
                  reasonable efforts, but without obligation to incur any
                  unreasonable cost or expense, to obtain such Required
                  Consents. Unless waived by Buyer, if a Required Consent is not
                  obtained prior to the Closing, the purchase price shall be
                  reduced by the amount set forth in Exhibit "B" for the
                  affected Interest, or where applicable and possible, the
                  proportionate allocated value, and such Interest shall be
                  excluded from the purchase and sale under this Agreement. Any
                  Required Consent waived by Buyer shall be deemed a Permitted
                  Encumbrance.

16.      Confidentiality. All Records, and all other confidential data provided
         to Buyer, whether before or after the date of this Agreement, and all
         title matters and environmental reports prepared by Buyer or Buyer's
         representatives relating to the Interests, shall be treated by Buyer as
         strictly confidential, and shall not be disclosed to any person, firm
         or corporation without the prior written consent of Seller; provided
         however that any information or documentation already in Buyer's
         possession or which Buyer may obtain by reason of its ownership of
         interests in the Northeast Blanco Unit other than the Interests shall
         not be deemed to be confidential. In the event this purchase and sale
         does not close, this covenant shall survive termination of this
         Agreement for a period of five (5) years after the date hereof, and
         Buyer shall promptly return all copies of the Records in its
         possession; and in the event the sale closes, this covenant shall
         terminate at Closing.

17.      DISCLAIMERS. THE INSTRUMENTS OF CONVEYANCE EXECUTED PURSUANT HERETO
         SHALL BE EXECUTED WITHOUT ANY REPRESENTATION, WARRANTY OR COVENANT OF
         TITLE OF ANY KIND OR NATURE, EITHER EXPRESS, IMPLIED OR STATUTORY;
         PROVIDED, HOWEVER, SELLER SHALL SPECIALLY WARRANT AND AGREE TO DEFEND
         THE TITLE TO THE INTERESTS AGAINST THE LAWFUL CLAIMS AND DEMANDS OF ALL
         PERSONS OR ENTITIES CLAIMING THE SAME OR ANY 


                                      -28-
<PAGE>   29

         PART THEREOF BY, THROUGH OR UNDER SELLER, BUT NOT OTHERWISE. THE
         INTERESTS ARE BEING CONVEYED AND ASSIGNED TO AND ACCEPTED BY THE BUYER
         IN THEIR "AS IS, WHERE IS" CONDITION AND STATE OF REPAIR, AND WITH ALL
         FAULTS AND DEFECTS, WITHOUT ANY REPRESENTATION, WARRANTY OR COVENANT OF
         ANY KIND OR NATURE, EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT
         LIMITED TO, WARRANTIES OF MARKETABILITY, QUALITY, CONDITION, CONFORMITY
         TO SAMPLES, MERCHANTABILITY, AND/OR FITNESS FOR A PARTICULAR PURPOSE,
         ALL OF WHICH ARE EXPRESSLY DISCLAIMED BY SELLER AND WAIVED BY BUYER.
         THE INTERESTS HAVE BEEN USED FOR OIL AND GAS DRILLING, PRODUCTION AND
         RELATED OPERATIONS. PHYSICAL CHANGES IN THE INTERESTS AND IN THE LANDS
         BURDENED THEREBY MAY HAVE OCCURRED AS A RESULT OF SUCH USES. THE
         INTERESTS MAY ALSO INCLUDE BURIED PIPELINES AND OTHER EQUIPMENT, THE
         LOCATIONS OF WHICH MAY NOT BE KNOWN BY SELLER OR READILY APPARENT BY A
         PHYSICAL INSPECTION OF THE INTERESTS. IT IS UNDERSTOOD AND AGREED THAT
         BUYER SHALL HAVE INSPECTED PRIOR TO CLOSING (OR SHALL BE DEEMED TO HAVE
         WAIVED ITS RIGHT TO INSPECT) THE LEASES, THE EQUIPMENT AND THE
         ASSOCIATED PREMISES AND SATISFIED ITSELF AS TO THEIR PHYSICAL AND
         ENVIRONMENTAL CONDITION, BOTH SURFACE AND SUBSURFACE, AND THAT BUYER
         SHALL ACCEPT ALL OF THE SAME IN THEIR "AS IS, WHERE IS" CONDITION AND
         STATE OF REPAIR, AND WITH ALL FAULTS AND DEFECTS, INCLUDING, BUT NOT
         LIMITED TO, THE PRESENCE OF NATURALLY OCCURRING RADIO ACTIVE MATERIAL
         AND MANMADE MATERIAL FIBERS. IN ADDITION, SELLER MAKES NO
         REPRESENTATION, COVENANT OR WARRANTY, EXPRESS, IMPLIED OR STATUTORY, AS
         TO THE ACCURACY OR COMPLETENESS OF ANY DATA OR RECORDS DELIVERED TO
         BUYER WITH RESPECT TO THE INTERESTS, OR CONCERNING THE QUALITY OR
         QUANTITY OF HYDROCARBON RESERVES, IF ANY, ATTRIBUTABLE TO THE
         INTERESTS, OR THE ABILITY OF THE 



                                      -29-
<PAGE>   30

         INTERESTS TO PRODUCE HYDROCARBONS, OR THE PRICES WHICH BUYER IS OR WILL
         BE ENTITLED TO RECEIVE FOR ANY SUCH HYDROCARBONS.

18.      DTPA Waiver. TO THE EXTENT APPLICABLE TO THE TRANSACTIONS CONTEMPLATED
         BY THIS AGREEMENT, BUYER HEREBY WAIVES ITS RIGHTS UNDER THE PROVISIONS
         OF THE TEXAS DECEPTIVE TRADE PRACTICES ACT, CHAPTER 17, SUBCHAPTER E,
         SECTIONS 17.41 THROUGH 17.63, INCLUSIVE (OTHER THAN SECTION 17.555,
         WHICH IS NOT WAIVED), OF THE TEXAS BUSINESS & COMMERCIAL CODE (A LAW
         THAT GIVES CONSUMERS SPECIAL RIGHTS AND PROTECTIONS). AFTER
         CONSULTATION WITH AN ATTORNEY OF ITS CHOICE, BUYER VOLUNTARILY CONSENTS
         TO THIS WAIVER.

19.      Closing. The Closing shall be held on or before that date which is ten
         (10) business days following the Termination Date (as hereinafter
         defined), at the offices of Seller at 5051 Westheimer, Suite 1400,
         Houston, Texas, or at such other time and place as Seller and Buyer may
         mutually agree in writing (the "Closing" or the "Closing Date"). For
         purposes of this Agreement, the "Termination Date" shall mean the
         effective date on which all of the following conditions are fully
         satisfied: (i) the unitholders of BRU shall have approved by an
         affirmative vote or consent, the termination and liquidation of BRU in
         accordance with Article VIII and Section 9.02 of the Trust Agreement,
         and (ii) the clearance or approval of the transactions contemplated in
         Section 19(i) hereinabove and any filings in connection therewith which
         may be required or advisable under applicable laws, rules and/or
         regulations by all applicable governmental authorities having
         jurisdiction and the compliance of such transactions and filing with
         any applicable stock exchange requirements.




                                      -30-
<PAGE>   31

20.      Transactions at Closing.

         (a)      Seller and Buyer shall execute, acknowledge, and deliver the
                  Assignment and Bill of Sale in the form as set forth in
                  Exhibit "E" hereto with respect to the Interests;

         (b)      Seller and Buyer shall execute, acknowledge and deliver the
                  Oil and Gas Lease in the form as set forth in Exhibit "F"
                  hereto with respect to the Interests;

         (c)      Buyer shall execute and deliver and Seller shall cause
                  Burlington Resources Gathering Inc., as successor-in-interest
                  to Meridian Oil Gathering Inc. to execute and deliver an
                  amendment to the Gathering Agreement in the form as set forth
                  in Exhibit "G" hereto, together with the Memorandum attached
                  thereto as Annex "1";

         (d)      Buyer shall execute and deliver, and Seller shall cause
                  Burlington Resources Trading Inc. ("BRTI"), as
                  successor-in-interest to Meridian Oil Trading Inc., to execute
                  and deliver, an assignment of the Gathering Agreement in the
                  form set forth in Exhibit "H" hereto;

         (e)      Buyer shall execute and deliver, and Seller shall cause BRTI
                  to execute and deliver, an agreement in the form set forth in
                  Exhibit "I" hereto, whereby the Gas Contract will be
                  terminated on the last day of the month in which the
                  Termination Date occurs;

         (f)      Buyer shall execute and deliver, and Seller shall cause BRTI
                  to execute and deliver, an agreement in the form as set forth
                  in Exhibit "J" hereto, whereby Buyer shall grant BRTI a right
                  of first refusal to purchase gas produced from the Interests;



                                      -31-
<PAGE>   32

         (g)      Seller and Buyer shall execute, acknowledge and deliver the
                  Assignment of Trust Agreement Rights and Obligations in the
                  form as set forth in Exhibit "K" hereto;

         (h)      Buyer shall execute and deliver, and Seller shall cause BRI to
                  execute and deliver, an Assignment of Contract Rights and
                  Obligations in the form as set forth in Exhibit "L" hereto;

         (i)      Seller shall deliver to Buyer the Records (but shall be
                  authorized to keep a copy of the Records);

         (j)      Seller and Buyer shall execute, acknowledge and deliver
                  mutually agreeable transfer orders or letters-in-lieu prepared
                  by the Seller, directing all purchasers of production to make
                  future payments of proceeds attributable to production from
                  the Interests to Buyer;

         (k)      Seller and Buyer shall execute and deliver a Preliminary
                  Closing Statement that shall set forth the Base Purchase Price
                  and each adjustment and the calculation of such adjustments
                  used to determine such amount (the "Closing Amount") in the
                  form as set forth in Exhibit "M" hereto;

         (l)      Seller shall deliver to Buyer (i) a certificate stating that
                  the representations of Seller contained in Section 7 hereof
                  are true as of the Closing Date, and (ii) a "non-foreign
                  person" affidavit in the form as set forth in Exhibit "N"
                  hereto;

         (m)      Seller shall deliver to Buyer the legal opinions referenced in
                  Sections 6(c) and 6(d) hereof;

         (n)      Buyer shall deliver to Seller a certificate stating that the
                  representations of Buyer contained in Section 8 hereof are
                  true as of the Closing Date;



                                      -32-
<PAGE>   33

         (o)      Buyer shall deliver to Seller the legal opinion referenced in
                  Section 5(b) hereof;

         (p)      Buyer shall deliver to Seller a complete copy of Buyer's
                  environmental assessment, including, but not limited to,
                  reports, data, valuation, assessments and conclusions;

         (q)      Seller shall deliver to Buyer possession of the Interests,
                  subject to any applicable operating agreement or other related
                  agreement affecting the Interests;

         (r)      Buyer shall deliver to Seller cash by wire transfer in the
                  amount of the Closing Amount to the following account:

                  Bank:                      Mellon Bank, Pittsburgh, PA.
                  ABA/Routing Number:        043-000-261
                  Account:                   104-9050
                  For Credit To:             Burlington Resources Services Inc.

         (s)      Seller shall deliver to Buyer cash by wire transfer in the
                  amount of all cash held by Seller on the Closing Date that is
                  payable in respect of the Royalty Interests under the Net
                  Profits Conveyance into the following non-interest bearing
                  account (as contemplated under Section 9.03(f) of the Trust
                  Agreement):

                  Bank:                     Bank One Texas, N.A., Houston, Texas
                  ABA/Routing Number:       111000614
                  Account:                  1560185785
                  For Credit To:            San Juan Partners, L.L.C. Operating 
                                             Account

21.      Further Assurance. Incidental and subsequent to Closing, each of the
         parties shall execute, acknowledge, and deliver to the other such
         further instruments, and take such



                                      -33-
<PAGE>   34

         other actions as may be reasonably necessary to carry out the
         provisions of this Agreement.

22.      Post-Closing Adjustments. On or before ninety (90) days following
         Closing, the parties shall undertake to agree with respect to the
         adjustments or payments that were not finally determined as of Closing,
         and the amount due from Buyer or Seller, as the case may be, pursuant
         to the Post-Closing adjustment. On or before one hundred twenty (120)
         days following Closing, Seller shall provide Buyer with a Final Closing
         Statement setting forth the Post-Closing adjustments. Seller shall
         provide Buyer access to such of Seller's records as may be reasonably
         necessary to verify the Post-Closing adjustments. Payment by Buyer or
         Seller shall be made in immediately available funds within five (5)
         days of agreement. If the Final Closing Statement has not been agreed
         upon on or before the date set forth herein, either party may seek to
         enforce any rights it claims pursuant to this Agreement.

23.      Proration of Taxes. All ad valorem taxes, real property taxes, and
         similar obligations with respect to the tax period in which the
         Effective Time occurs (the "current tax period") shall be apportioned
         between Seller and Buyer as of the Effective Time based on an estimate
         of the immediately preceding tax period assessment, and the Base
         Purchase Price shall be reduced at Closing by the amount of such
         estimated taxes owed by Seller for that portion of the current tax
         period prior to the Effective Time.

24.      Proceeds. All proceeds attributable to the Interests and accruing to
         the period on and after the Effective Time shall belong to Buyer. In
         the event Seller has received proceeds belonging to Buyer after the
         Effective Time, Seller will account to Buyer for such proceeds at the
         same price Seller received for the production in accordance with its
         existing product purchase and sale contracts.

25.      Failure to Close. Subject to the other provisions of this Section, if
         all of the conditions to Closing set forth in Sections 5 and 6 hereof
         have not been satisfied or waived by the 


                                      -34-
<PAGE>   35

         respective parties on or before April 1, 1999 (or such later date as
         hereafter may be mutually agreed upon by the parties in writing), this
         Agreement shall terminate automatically, and no party hereto shall have
         any further obligations or any liability to the other party pursuant to
         this Agreement; provided, however, that (i) this Agreement shall not
         terminate automatically on April 1, 1999 if either (A) the conditions
         to Closing set forth in Sections 5 and 6 hereof have not been satisfied
         solely because the transactions contemplated hereby are still pending
         approval or clearance from the SEC or other regulatory agency having
         jurisdiction or (B) such approvals or clearances have been received,
         but because of the delay involved in obtaining such approvals or
         clearances, adequate time does not remain to accomplish the steps
         subsequent to receiving such approvals or clearances necessary for all
         conditions to have been met and (ii) nothing herein shall relieve any
         party from liability for its willful failure to satisfy any conditions
         to Closing required to be satisfied by it or for such party's breach of
         any of its representations, covenants or other obligation hereunder. In
         addition to any other legal or equitable rights or remedies available
         to Seller arising from any breach by Buyer of its representations,
         covenants or other obligations hereunder, if Buyer fails to timely
         initiate proceedings to terminate or liquidate BRU in accordance with
         Article VIII and Sections 9.02 and 9.03 of the Trust Agreement, Buyer
         shall pay to Seller an amount equal to TWO MILLION DOLLARS ($2,000,000)
         as agreed liquidated damages and not as a penalty, it being agreed that
         actual damages for such breach would be difficult to ascertain and that
         such liquidated damages amount is reasonable. Such payment shall be
         made to an account designated by Seller by wire transfer of immediately
         available funds. Upon any termination of this Agreement, Seller shall
         be free immediately to enjoy all rights of ownership of the Interests
         and to sell, transfer, encumber or otherwise dispose of the Interests
         to any party without any restriction under this Agreement.

26.      Use of Seller Names. Buyer agrees that, as soon as practicable after
         Closing, it will remove or cause to be removed the names and marks
         Burlington Resources, Meridian Oil, El Paso Production, or Southland
         Royalty, where and if they exist, and all variations



                                      -35-
<PAGE>   36


         and derivatives thereof and logos relating thereto from the Interests
         and will not thereafter make any use whatsoever of such names, marks,
         and logos.

27.       Operations and Other Covenants Prior to Closing

         (a)      During the period from the date of this Agreement to Closing,
                  Seller shall (i) consult with Buyer with respect to all AFE's
                  over THIRTY-FIVE THOUSAND DOLLARS ($35,000) net to the
                  Interests of Seller which are received by Seller with respect
                  to any Interest, and consult with Buyer with respect to all
                  material decisions to be made with respect to the Interests,
                  including, without limitation, the incurring of costs for
                  discretionary expenditures for operations in excess of SEVENTY
                  THOUSAND DOLLARS ($70,000) net to the interest of Seller for
                  which AFE's are not prepared, (ii) comply with the terms and
                  conditions of all applicable contracts, laws and regulations
                  with respect to the Interests, and (iii) not transfer, sell,
                  hypothecate, encumber, abandon or otherwise dispose of any
                  material portion of the Interests (other than the sale of
                  production in the ordinary course of business) or as required
                  in connection with the exercise of third parties of
                  preferential rights to purchase any of the Interests without
                  the express written consent of Buyer.

         (b)      In accordance with Section 8.02 of the Trust Agreement, Buyer,
                  in its capacity as an owner of BRU Units, will timely call a
                  meeting (or request that a meeting be called) of the holders
                  of BRU Units (the "Unitholder Meeting") to be held as soon as
                  reasonably practicable under the circumstances for the purpose
                  of voting on the termination of BRU in accordance with Article
                  VIII and Sections 9.02 of the Trust Agreement. Buyer and
                  Seller agree that, in connection with the Closing and as a
                  result of the termination of BRU and in accordance with the
                  approval of the Termination Proposal, the following events
                  shall occur: (i) the Gas Contract shall terminate, (ii) the
                  Gathering Agreement shall be amended, (iii) Seller and BRI
                  shall assign, and Buyer shall assume, all of Seller's and
                  BRI's rights and 


                                      -36-
<PAGE>   37

                  obligations under the Trust Agreement and the Administrative
                  Services Agreement, and (iv) the obligations of BRI under the
                  Trust Agreement and the Administrative Services Agreement
                  (other than the obligations relating to the windup of BRU and
                  any such obligations which by their express terms survive the
                  termination of BRU) shall terminate and BRI shall be released
                  therefrom (the proposal to terminate the Trust and the events
                  described in clauses (i) through (iv) hereof to be effected in
                  connection therewith and as a result thereof being referred to
                  herein collectively as "Termination Proposal"). In connection
                  with such meeting, if required in order to obtain the
                  requisite approval of the Termination Proposal by the holders
                  of BRU Units and to effect a termination of BRU as soon as
                  practicable, Buyer will (i) prepare (or cause to be prepared)
                  and use (alone or with others) its commercially reasonable
                  efforts to have cleared by the SEC as promptly as practicable
                  such information regarding the Termination Proposal as is
                  required to be included in a proxy or information statement of
                  Buyer or BRU (the "Proxy Statement") and all other proxy or
                  informational materials to be filed with the SEC for such
                  meeting and (ii) otherwise comply with all legal requirements
                  applicable to it under federal (including, without limitation,
                  the Securities Exchange Act of 1934, as amended), state or
                  local law and of The New York Stock Exchange, Inc. applicable
                  to it and to such meeting (including without limitation, the
                  requirements applicable to it arising under the Trust
                  Agreement). Such Proxy Statement shall include a statement
                  that Buyer intends to vote its BRU Units and the BRU Units for
                  which it controls the voting rights at the Unitholder Meeting
                  "for" approval of the Termination Proposal. Buyer agrees to
                  cooperate with the Trustee in the preparation of the Proxy
                  Statement and any amendment or supplement thereto. Buyer
                  undertakes and agrees to vote all BRU Units owned by it or for
                  which it controls the voting rights (including the BRU Units),
                  for approval of the Termination Proposal at the Unitholder
                  Meeting. Seller agrees to use its commercially reasonably
                  efforts to assist Buyer and the Trustee of BRU in connection
                  with the furnishing of information (in its possession or which
                  it can obtain without unreasonable effort or expense)
                  determined by Buyer 


                                      -37-
<PAGE>   38

                  or the Trustee to be required for disclosure in, and seeking
                  SEC clearance of, the Proxy Statement, if such information is
                  not otherwise available to Buyer or the Trustee without
                  unreasonable effort or expense.

         (c)      As soon as reasonably practicable following Buyer notifying
                  Seller that Buyer beneficially owns more than 66-2/3% of the
                  outstanding BRU Units, Seller shall notify the Trustee in
                  writing, pursuant to Section 5.04(d) of the Trust Agreement,
                  to (i) prepare and file (or cause to be prepared and filed)
                  with the SEC, (ii) use its commercially reasonable efforts to
                  have cleared by the SEC and (iii) thereafter mail (or cause to
                  be mailed) to BRU's unitholders as promptly as practicable, a
                  preliminary and definitive Proxy Statement of BRU that
                  includes the Termination Proposal (which Termination Proposal
                  and the other information required to be disclosed with
                  respect thereto shall be prepared and submitted to the Trustee
                  by Buyer for inclusion in the Proxy Statement) and all other
                  materials determined by Buyer or the Trustee to be required
                  for the Unitholder Meeting. Buyer agrees to take such actions
                  as shall be commercially reasonable to respond to SEC comments
                  to any such filing and Seller agrees to notify the Trustee in
                  writing to file same. When the Proxy Statement has been
                  cleared by the SEC for mailing, Seller (upon Buyer's request)
                  shall notify the Trustee in writing to mail the definitive
                  Proxy Statement to BRU Unitholders as of the applicable record
                  date. Thereafter, Buyer and Seller shall, and shall use
                  commercially reasonable efforts to cause the Trustee to comply
                  with all legal requirements applicable to BRU or the
                  Termination Proposal under federal, state or local law and of
                  the New York Stock Exchange, Inc. applicable to it (including,
                  without limitation, the requirements applicable to it arising
                  under the Trust Agreement).

         (d)      Buyer will use its reasonable best efforts to assure under the
                  circumstances that, the Proxy Statement and any amendments or
                  supplements thereto will, when filed, comply as to form in all
                  material respects with the applicable requirements of the 1934
                  Act and applicable to Buyer. Buyer will use its reasonable
                  best efforts to 


                                      -38-
<PAGE>   39

                  assure under the circumstances that, at the time the Proxy
                  Statement or any amendment or supplement thereto is first
                  mailed to BRU's unitholders and at the time such unitholders
                  vote on the approval of the Termination Proposal, the Proxy
                  Statement, as supplemented or amended, if applicable, will, to
                  Buyer's knowledge, not contain any untrue statement of a
                  material fact or omit to state any material fact necessary in
                  order to make the statements contained therein, in the light
                  of the circumstances under which they were made, not
                  misleading. The foregoing representations and warranties will
                  not apply to statements or omissions included in the Proxy
                  Statement or any amendment or supplement thereto based upon
                  information furnished to Buyer by Seller or any other Person
                  for use (or incorporation by reference) therein.

         (e)      Buyer shall pay all reasonable costs and expenses (other than
                  fees and expenses of Seller's counsel) incurred by Seller, BRI
                  and their affiliates related to the preparation of the Proxy
                  Statement and any amendments and supplements thereto, any
                  schedule or other document that is required to be filed on
                  behalf of BRU with the SEC or mailed to unit holders of BRU in
                  connection with the transactions contemplated hereby,
                  including, without limitation, any such costs and expenses
                  Seller, BRI and affiliates are required to pay on behalf of
                  the BRU trustee.

         (f)      From the date hereof until the termination of this Agreement,
                  Seller will not, and will use its commercially reasonable
                  efforts to cause its officers, directors, employees, financial
                  or legal advisors not to, directly or indirectly, (i) take any
                  action to solicit, initiate or encourage any proposal to
                  acquire from Seller the Interests, or any interest therein,
                  (ii) engage in negotiations with, or disclose any nonpublic
                  information relating to the Interests or afford access to the
                  properties, books or records of Seller or any of its
                  subsidiaries to, any person that may be considering making, or
                  has made, a proposal to acquire the Interests, or (iii)
                  exercise its right under Section 9.03(c) of the Trust
                  Agreement to make a cash offer to purchase all of the
                  Remaining Royalty Interests (as defined in the Trust


                                      -39-
<PAGE>   40

                  Agreement) at any time prior to the Option Period Termination
                  Date (as defined in the Trust Agreement). Seller shall, and
                  shall cause its directors, employees, officers and financial
                  and legal advisors to, cease immediately and cause to be
                  terminated all activities, discussions or negotiations, if
                  any, with any persons conducted heretofore with respect to any
                  proposal by any person to acquire the Interests, or any
                  interest therein.

28.      Occasional Sale. Seller and Buyer believe that this purchase and sale
         of the Interests constitutes an isolated or occasional sale and is not
         subject to sales tax; provided, however, if any sales, transfer, use
         taxes or other similar taxes are due or should hereafter become due
         (including penalty and interest thereon) by reason of this transaction,
         Buyer shall timely pay and solely bear all such taxes.

29.      Recording Documents. Buyer shall pay all documentary, filing, and
         recording fees incurred in connection with the filing and recording of
         the instruments of conveyance. As soon as practicable after Closing,
         Buyer shall provide Seller with recorded copies of all documents
         conveying the Interests to Buyer.

30.      Notices. All notices hereunder shall be sufficiently given for all
         purposes hereunder if in writing and delivered personally, or to the
         extent receipt is confirmed by the party charged with notice, sent by
         documented overnight delivery service, by United States Mail, telecopy,
         telefax or other electronic transmission service to the appropriate
         address or number as set forth below. Notices to Seller or Buyer shall
         be addressed to:

<TABLE>
<CAPTION>
               SELLER                                               BUYER
               ------                                               -----
<S>                                                        <C>
      Burlington Resources Oil & Gas Company               San Juan Partners, L.L.C.
      3535 E. 30th Street                                  910 Travis Street, Suite 2150
      P. O. Box 4289                                       Houston, Texas 77002
      Farmington, New Mexico 87402

      Attn:  John Zent                                     Attn: Scott Smith
      Fax: (505) 599-4062                                  Fax: (713) 759-2040
</TABLE>





                                      -40-
<PAGE>   41

                  With copy to:

                  Burlington Resources Oil & Gas Company
                  5051 Westheimer
                  Suite 1400
                  Houston, Texas 77056

                  Attn:  Sally McDonald
                  Fax: (713) 624-9250

31.      Entire Agreement. This instrument states the entire agreement and
         supersedes all prior agreements between the parties concerning the
         subject matter hereof. This Agreement may be supplemented, altered,
         amended, modified or revoked by writing only, signed by both parties.

32.      Counterpart. This Agreement may be executed by Buyer and Seller in any
         number of counterparts, each of which shall be deemed an original
         instrument, but all of which together shall constitute one and the same
         instrument.

33.      Time of Essence. Time is of the essence in this Agreement.

34.      Announcements. Seller and Buyer shall consult with each other prior to
         the release of any press releases and other announcements concerning
         this Agreement or the transactions contemplated hereby. Any press
         release or other announcements will be at a time and in a form
         reasonably acceptable to Seller and Buyer.

35.      Waiver. Any of the terms, provisions, covenants, representations,
         warranties or conditions hereof may be waived only by a written
         instrument executed by the party waiving compliance. The failure of any
         party at any time or times to require performance of any provisions
         hereof shall in no manner affect such party's right to enforce the
         same. No waiver of any of the provisions of this Agreement shall be
         deemed or shall constitute a waiver of any other provisions hereof
         (whether or not similar), nor shall such waiver constitute a continuing
         waiver unless otherwise expressly provided.



                                      -41-
<PAGE>   42

36.      Survival of Representations and Covenants. All representations and
         covenants of the parties to the extent not fully performed or waived
         prior to Closing shall survive the Closing.

37.      Reliance. Prior to executing and/or closing this Agreement, Buyer has
         been afforded an opportunity to (i) examine the Interests and all
         materials relating thereto provided to it by Seller, (ii) discuss with
         representatives of Seller such materials and the nature and operation
         of the Interests, and (iii) investigate the condition of the Interests.
         In entering into and closing this Agreement, Buyer has relied solely on
         the express representations and covenants of Seller in this Agreement,
         its independent investigation of, and judgment with respect to, the
         Interests, and the advice of its own legal, tax, economic,
         environmental, engineering, geological and geophysical advisors, and
         not on any comments or statements of Seller or any representatives or
         agents of, or consultants or advisors engaged by, Seller.

38.      Governing Law. This Agreement and the rights and obligations of the
         parties hereto shall be governed, construed, and enforced in accordance
         with the laws of the State of Texas. The parties agree that any
         litigation relating directly or indirectly to this Agreement must be
         brought before and determined by a court of competent jurisdiction in
         Houston, Harris County, Texas, except as the laws of the any other
         jurisdiction manditorily apply.

39.      Legal Fees. The prevailing party in any legal proceeding brought under
         or to enforce this Agreement shall be additionally entitled to recover
         court costs and reasonable attorneys' fees from the non-prevailing
         party.

40.      Agreement for the Parties' Benefit Only. Except with respect to the
         persons and the entities indemnified hereunder, this Agreement is not
         intended to confer upon any person



                                      -42-
<PAGE>   43

         or entity not a party hereto any rights or remedies hereunder, and no
         person or entity other than the parties hereto is entitled to rely on
         any representation, covenant, or agreement contained herein.

41.      Severability. If any term or other provision of this Agreement is
         invalid, illegal or incapable of being enforced by any rule of law or
         public policy, all other conditions and provisions of this Agreement
         shall nevertheless remain in full force and effect so long as the
         economic or legal substance of the transactions contemplated hereby is
         not affected in any adverse manner to any party. Upon such
         determination that any term or other provision is invalid, illegal or
         incapable of being enforced, the parties hereto shall negotiate in good
         faith to modify this Agreement so as to effect the original intent of
         the parties as closely as possible in an acceptable manner to the end
         that the transactions contemplated hereby are fulfilled to the extent
         possible.

42.      Binding Effect; Assignment. All the terms, provisions, covenants,
         representations, and conditions of this Agreement shall be binding upon
         and inure to the benefit of and be enforceable by the parties hereto
         and their respective successors; provided, however, this Agreement or
         any portion thereof and the rights and obligations hereunder shall not
         be assignable or delegable by any party without the express prior
         written consent of the non-assigning or non-delegating party; provided,
         however, Seller shall not unreasonably withhold its consent to an
         assignment by Buyer of its rights and obligations under this Agreement
         to an affiliate of Buyer.

43.      Enforcement. Should Buyer or Seller default in the performance of this
         Agreement, the non-defaulting party shall be entitled to enforce
         specific performance of this Agreement, or exercise any other right or
         remedy it may have at law or in equity by reason of such default.

44.      Like Kind Exchange - Internal Revenue Code Section 1031. Buyer agrees 
         to cooperate with and assist Seller as reasonably requested to enable
         Seller to comply with the provisions of 


                                      -43-
<PAGE>   44

         Section 1031 of the Internal Revenue Code and related provisions
         thereto; provided however, Buyer shall not be obligated to incur any
         expense or other liability in connection with same. Seller shall
         indemnify, defend and hold Buyer, its agents, employees, directors,
         officers, shareholders, partners, successors and assigns harmless from
         and against any and all Claims to the extent same is a result of (i)
         any and all transactions contemplated by this Section 43, (ii) any act
         or omission of Seller or Buyer relating to any transaction contemplated
         by this Section 43, (iii) any obligations (including, without
         limitation, any taxes and/or interest assessed thereon, fines,
         penalties, punitive damages or liabilities arising under any common law
         cause of action) owed to any federal, state or local taxing authority
         arising out of or related to the actions or inactions of Seller in
         compliance or attempted compliance with the laws and regulations
         related to the like kind exchange, and (iv) any and all obligations or
         other liabilities owed to or claimed by any escrow agent or other third
         party used by Seller as an intermediary in connection with any like
         kind exchange.

45.      Price Credit Account. As of the Effective Time the amount of "Price
         Credits" in the "Price Credit Account" under the Gas Contract equaled
         $4,116,000.00 (the "Base Price Credit Amount"). If the amount of Price
         Credits in the Price Credit Account on the Closing Date (the "Closing
         Price Credit Amount") is less than the Base Price Credit Amount, then
         Seller shall cause BRTI to pay to Buyer, at Closing, an amount equal to
         such difference, and if the Closing Price Credit Amount is greater than
         the Base Price Credit Amount, then Seller shall pay to BRTI, at
         Closing, an amount equal to such difference. On or about the 60th day
         following the effective date of the termination of the Gas Contract
         (such effective date being referred to herein as the "Gas Contract
         Termination Date"), Seller shall cause BRTI to deliver to Buyer a
         statement setting forth in reasonable detail the amount of Price
         Credits in the Price Credit Account on the Gas Contract Termination
         Date (the "Termination Price Credit Amount"). If the Termination Price
         Credit Amount is less than the Closing Price Credit Amount then Seller
         shall cause BRTI to pay to Buyer, on or before the 75th day following
         the Gas Contract Termination Date, an amount equal to such difference,
         and if the Termination Price Credit Amount is


                                      -44-
<PAGE>   45

         greater than the Closing Price Credit Amount, then Buyer shall pay to
         BRTI, on or before the 75th day following the Gas Contract Termination
         Date, the amount of such difference. All payments required under this
         Section 45 shall be made in cash by wire transfer to account designated
         in writing by the party receiving such funds.

EXECUTED as of the date first above mentioned.

                           SELLER

                           BURLINGTON RESOURCES OIL & GAS COMPANY

                           By: /s/ MARK E. ELLIS
                               -------------------------------------------------

                           Its:    Vice President
                               -------------------------------------------------

                           BUYER

                           SAN JUAN PARTNERS, L.L.C.

                                By:  O'Sullivan Oil & Gas Company, Inc., Manager

                           By:   /s/ C. N. O'SULLIVAN
                              --------------------------------------------------
                                     C. N. O'Sullivan, President



                                      -45-


<PAGE>   1
                                                                  EXHIBIT (b)(2)


                               SECOND AMENDMENT TO
                      LOAN AGREEMENT DATED JANUARY 15, 1998
                                  BY AND AMONG

                            SAN JUAN PARTNERS, L.L.C.
                                       AND
                              BANK ONE, TEXAS, N.A.


                  This Second Amendment to Loan Agreement dated January 15,
1998, is entered into as of October 9, 1998 (this "Second Amendment") by and
among SAN JUAN PARTNERS, L.L.C. ("Borrower"), and BANK ONE, TEXAS, N.A., a
national banking association (the "Bank").

                               W I T N E S E T H:

                  Borrower and Bank entered into a Loan Agreement dated January
15, 1998 (the "Loan Agreement") as amended by the First Amendment dated June 3,
1998.

                  Borrower has requested that Bank increase the face amount of
the Note, increase the amount of the Commitment, and make certain other
modifications to the Loan Agreement, and Bank is willing to do so subject to and
conditioned upon the provisions this Second Amendment.

                  NOW, THEREFORE, in consideration of the promises herein
contained, and each intending to be legally bound hereby, the parties agree as
follows:

I.         Amendments to Loan Agreement.

           Article I of the Loan Agreement is hereby amended by adding the
following definitions:

           "First Amendment" means the First Amendment to the Loan Agreement
dated January 3, 1998.

           "Second Amendment" means the Second Amendment to the Loan Agreement
dated October 9, 1998.

           Article I of the Loan Agreement is hereby amended to revise the
definition of "Commitment" by replacing the amount "25,000,000.00" that appears
therein with the amount "$26,500,000.00."

           Article I of the Loan Agreement is further amended to revise the
definition of "Note" in its entirety to read as follows:

           "Note" means that certain amended and restated advancing term note in
           the original face amount of $32,000,000.00, made by Borrower payable
           to the order of Bank, in the form attached as Exhibit "A" to the
           Second Amendment, together with all deferrals, renewals, extensions,
           amendments, modifications or 




<PAGE>   2



           rearrangements thereof, which promissory note shall evidence the
           advances to Borrower by Bank pursuant to Section 2.01 hereof.

           Article I of the Loan Agreement is further amended to revise the
definition of "Permanent Brokerage Account" by replacing the account number
"029-102287-105" that appears therein with the account number "019-057453-040."

           Section 2.08 of the Loan Agreement is hereby amended by replacing the
phrase "$25,000,000.00 as of January 15, 1998," which appears at the end of the
first sentence thereof, with the phrase "$26,500,000.00 as of October 9, 1998."

           Section 2.11 of the Loan Agreement is hereby amended by adding the
following text at the end of such Section:

           At such time as the Commitment is increased pursuant to the Second
           Amendment, Borrower shall pay to Bank an additional Facility Fee
           equal to five tenths of one percent (.5%) of the difference between
           the amount of such increased Commitment minus $25,000,000.00.

           Section 3.10 of the Loan Agreement is hereby amended in its entirety
to read as follows:

           3.10 Cash Collateral Account. Borrower shall have established with
           Banc One Securities Corporation as of the closing of the Second
           Amendment Account No. 019-057453-040, into which the deposits
           required by Section 5.20 shall be made.

           Section 5.20(b) of the Loan Agreement is hereby amended by replacing
the date "September 1, 1998," which appears in the first sentence thereof with
the date "December 1, 1998," and by replacing the date "November 30, 1988,"
which also appears in the first sentence thereof, with the date "December 31,
1998".

           Section 5.29 of the Loan Agreement is hereby amended in its entirety
to read as follows:

           5.29 Deposit of Trust Units in Brokerage Account and Delivery of
           Trust Unit Certificates to Bank. Borrower shall cause all Trust Units
           to be either: (a) acquired in the name of Banc One Securities
           Corporation and held in the Permanent Brokerage Account, provided
           that with respect to any Trust Units acquired for the account of
           Borrower by Jeffries Corporation, such Trust Units may be held in the
           name of Jeffries Corporation in the Pass Through Brokerage Account
           for not more than seven days from the date of acquisition until
           transferred to the Permanent Brokerage Account, or (b) acquired in
           the name of Borrower pursuant to a certificate or certificates issued
           by the Trust evidencing Borrower's ownership of a designated number
           of Trust Units (herein called, whether one or more, a "Unit
           Certificate"), in which case each such Unit Certificate shall be
           delivered by Borrower to Bank within two (2) Business Days 



                                       -2-

<PAGE>   3



           after Borrower's acquisition of the Trust Units evidenced by such
           Unit Certificate (or, if later, within two (2) Business Days after
           the Unit Certificate evidencing such Trust Unit ownership is
           delivered to Borrower or its representative), together with a blank
           Trust Unit power executed by Borrower evidencing the transfer of
           Borrower's interest in the Trust Units represented by such Unit
           Certificate.

           Exhibit "A" to the Loan Agreement is hereby amended by replacing such
exhibit with Exhibit "A" to the Second Amendment.

           Exhibit "C" to the Loan Agreement is hereby amended by modifying the
description of the "Pledge Agreement" described in Item 2 thereof to read as
follows:

           2. PLEDGE AGREEMENT granting Bank a first priority security interest
           in: (a) the Pass Through Brokerage Account and the Permanent
           Brokerage Account in which all of Borrower's Trust Units that are not
           acquired in Borrower's own name pursuant to a Unit Certificate
           evidencing Borrower's ownership thereof shall be maintained, and (b)
           all Trust Units acquired in Borrower's own name pursuant to a Unit
           Certificate designating Borrower as the owner of such Trust Units.

II. Conditions to Second Amendment. This Second Amendment shall not become
effective until the following conditions have been satisfied:

           A. Bank shall have received the Note (in the form attached as Exhibit
           A to the Second Amendment), multiple counterparts of the Second
           Amendment, as requested by Bank, and a Certificate of Compliance (in
           the form attached as Exhibit B to the Second Amendment), all duly
           executed on behalf of Borrower.

           B. Bank shall have received amendments to the Pledge of Brokerage
           Account and to the U.C.C.-1 Financing Statement, each previously
           executed and delivered by Borrower to Bank pursuant to Section 3.16
           of the Loan Agreement, such amendments to be in form and substance
           satisfactory to Bank in its discretion, amending the number of the
           Permanent Brokerage Account to designate the proper account number,
           and also adding to the Collateral covered by such Pledge and
           Financing Statement all Trust Units held in Borrower's name pursuant
           to one or more Unit Certificates, together with blank Trust Unit
           powers in form satisfactory to Bank in its discretion, all duly
           executed on behalf of Borrower.

           C. Bank shall have received payment of the fee required by Section
           2.11 of the Loan Agreement, as amended by the Second Amendment.

           D. The requirements of Article III of the Loan Agreement shall be
           satisfied to the extent that they applicable with respect to any
           Trust Units that are to be added to the Borrowing 



                                       -3-


<PAGE>   4


           Base Property and any additional advances that are to be made
           pursuant to the Second Amendment, including Sections 3.03, 3.04,
           3.06, 3.09, 3.11, and 3.13 through 3.17.

III. Extent of Amendments. This Second Amendment shall not be deemed to be an
amendment by Bank of any covenant, condition or obligation on the part of the
Borrower under the Loan Agreement, as amended hereby, except as expressly set
forth herein. In addition, this Second Amendment shall in no respect evidence
any commitment by the Bank to grant any future amendments of any covenant,
condition or obligation on the part of the Borrower under the Loan Agreement, as
amended hereby. Any further amendments, waivers or consents must be specifically
agreed to in writing in accordance with Section 8.12 of the Loan Agreement.

IV. Reaffirmation of Representations and Warranties. To induce the Bank to enter
into this Second Amendment, the Borrower hereby reaffirms, as of the date
hereof, its representations and warranties contained in Article IV of the Loan
Agreement and in all other documents executed pursuant thereto, and additionally
represents and warrants as follows:

           A. The execution and delivery of this Second Amendment and the
           performance of Borrower of its obligations under this Second
           Amendment are within Borrower's power, have been duly authorized by
           all necessary corporate action, have received all necessary
           governmental approval (if any shall be required), and do not and will
           not contravene or conflict with any provision of law or of the
           charter or by-laws of the Borrower or of any agreement binding upon
           Borrower.

           B. This Second Amendment represents the legal, valid and binding
           obligations of the Borrower enforceable against the Borrower in
           accordance with its terms subject as to enforcement only to
           bankruptcy, insolvency, reorganization, moratorium or other similar
           laws affecting the enforcement of creditors' rights generally.

           C. Since the date of the Loan Agreement, no change, event or state of
           affairs has occurred and is continuing which would constitute an
           event of default as described in Section 7.01 of the Loan Agreement.

V. Defined Terms. Terms used herein that are defined in the Loan Agreement shall
have the same meanings herein, unless the context otherwise requires.

VI. Reaffirmation of Loan Agreement. This Second Amendment shall be deemed to be
an amendment to the Loan Agreement, and the Loan Agreement, as amended hereby,
is hereby ratified, adopted and confirmed in each and every respect.

VII. Governing Law. THIS SECOND AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS AND THE APPLICABLE LAWS OF THE
UNITED STATES OF AMERICA. This Second Amendment has been entered into in Harris
County, Texas, and it shall be performable for all purposes in Harris County,
Texas. Courts within the State of Texas shall have jurisdiction over any and all
disputes 



                                       -4-


<PAGE>   5



between the Borrower and the Bank, whether in law or equity, including,
but not limited to, any and all disputes arising out of or relating to this
Second Amendment or any other Loan Documents; and venue in any such dispute
whether in federal or state court shall be laid in Harris County, Texas.

VIII. Severability. Whenever possible each provision of this Second Amendment
shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Second Amendment shall be
prohibited by or invalid under applicable law, such provision shall be
ineffective to the extent of such prohibition or invalidity, without
invalidating the remainder of such provision or the remaining provisions of this
Second Amendment.

IX.   Execution in Counterparts. This Second Amendment may be executed in any
number of counterparts and by the different parties on separate counterparts on
different dates, and each such counterpart shall be deemed to be an original,
but all such counterparts shall together constitute but one and the same
agreement.

X.    Section Captions. Section captions used in this Second Amendment are for
convenience of reference only, and shall not affect the construction of this
Second Amendment.

XI.   Successors and Assigns. This Second Amendment shall be binding upon the
Borrower, the Bank and its respective successors and assigns, and shall inure to
the benefit of the Borrower, the Bank and the respective successors and assigns
of the Bank.

XII.  Non-Application of Chapter 346 of Texas Finance Code. The provisions of
Chapter 346 of the Texas Finance Code are specifically declared by the parties
hereto not to be applicable to the Loan Agreement, this Second Amendment or any
of the other Loan Documents or to the transactions contemplated hereby.

XIII. Notice. THE LOAN AGREEMENT, AS HEREBY AMENDED, EMBODIES THE ENTIRE
AGREEMENT BETWEEN THE BORROWER AND THE BANK AND SUPERSEDES ALL PRIOR PROPOSALS,
AGREEMENTS AND UNDERSTANDINGS RELATING TO THE SUBJECT MATTER HEREOF. THE
BORROWER CERTIFIES THAT IT IS RELYING ON NO REPRESENTATION, WARRANTY, COVENANT
OR AGREEMENT EXCEPT FOR THOSE SET FORTH IN THE LOAN AGREEMENT, AS HEREBY
AMENDED, AND THE OTHER DOCUMENTS PREVIOUSLY EXECUTED IN CONNECTION THEREWITH.



                                      -5-



<PAGE>   6



         IN WITNESS WHEREOF, the parties hereto have caused this Second
Amendment to be duly executed as of the day and year first above written.


                                 BORROWER:


                                 SAN JUAN PARTNERS, L.L.C

                                 By: O'Sullivan Oil & Gas Company, Inc.
                                     Its Sole Manager


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



                                 BANK:

                                 BANK ONE, TEXAS, N.A.


                                     By: /s/ Steve Shatto 
                                        ---------------------------------------
                                         Steve Shatto
                                         Vice President




                                      -6-




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