BURLINGTON RESOURCES COAL SEAM GAS ROYALTY TRUST
SC 13D/A, 1998-07-15
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. 21

                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)

                                  July 10, 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                         5,331,468 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0 Units
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 60.58%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         5,331,468 Units
          OWNED BY                 ------------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   ------------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,331,468 Units
- -----------------------------------------------------------------------------------------------------------------------
                               AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
              11

                                  5,331,468 Units
- -----------------------------------------------------------------------------------------------------------------------
                               CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
              12

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

                                  60.58%
- -----------------------------------------------------------------------------------------------------------------------
                               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                         5,331,468 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 60.58%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 CO
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>




                                      4
<PAGE>   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                         5,331,468 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 60.58%
- ----------------------------------------------------------------------------------------------------------------------
                              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                        5,331,468 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                           0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                            5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 60.58%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         5,331,468 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 60.58%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         5,331,468 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 60.58%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         5,331,468 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 60.58%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         5,331,468 Units
          OWNED BY                 -----------------------------------------------------------------------------------

            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 60.58%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         5,331,468 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 60.58%
- ----------------------------------------------------------------------------------------------------------------------
                              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                        5,331,468 Units  
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                            5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 60.58%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         5,331,468 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 5,331,468 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 60.58%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 IN
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>





                                      13
<PAGE>   14
         This Amendment No. 21 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 5.  INTEREST IN SECURITIES OF THE ISSUER

Item 5 is amended as follows:

         (a) and (b)      As of the close of business on July 10, 1998, the
Purchaser beneficially owned 5,331,468 Units consisting approximately 60.58% of
the currently outstanding Units (the percentage of Units being based upon
8,800,000 Units outstanding as of May 1, 1998, as set forth in the Trust's
Quarterly Report on Form 10-Q for the quarter ended March 31, 1998).


         Pursuant to the Amended and Restated Limited Liability Company
Regulations of the Purchaser, a copy of which has been filed as Exhibit (b) to
the original Schedule 13D, the Parents have shared voting and dispositive power
over the 5,331,468 Units owned by the Purchaser and may be deemed to be the
beneficial owner thereof.

         (c)     Since June 15, 1998, the date of the most recent filing by
the Purchaser and the Parents on Schedule 13D, the Purchaser has purchased
Units in the manner, in the amounts, on the dates and at the prices set forth
on Schedule 1 attached hereto and incorporated by reference.

         (d)     Not applicable.

         (e)     Not applicable.

ITEM 6.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
         TO SECURITIES OF THE ISSUER.
         
         On July 10, 1998, the Purchaser entered into a letter agreement (the
"Agreement") concerning the sale of 356,228 Units by Devon Acquisition
Corporation ("Devon") to the Purchaser. After the sale of the Units by Devon to
the Purchaser and for as long as the Purchaser continues to own 50% or more of
the outstanding Units, Devon has agreed, pursuant to the Agreement, that it
shall not acquire any additional Units without the written consent of the
Purchaser. The Agreement further provides that, if, within eighteen months
after execution of the Agreement, the Purchaser should acquire the underlying
working interest (the "Working Interest") associated with the Trust from
Burlington Resources, Inc. ("Burlington"), and the Trust is subsequently
consolidated into the Purchaser, then Devon shall have ten days to purchase an
undivided 6.70% of the 19.6% working interest/16.5% net revenue interest (the
"NEBU Property Interest") owned by the Purchaser by paying 6.70% of the
Purchaser's direct out-of-pocket expenses reasonably incurred in the
Purchaser's acquisition of the Units and the Working Interest, including
financing costs.

         In addition, if the Purchaser should enter into an agreement with
Burlington whereby Purchaser, upon consolidation of the Trust with the Working
Interest, is obligated to sell a percentage of the NEBU Property Interest on
the same basis as mentioned above, then the NEBU Property Interest which Devon
has the right to acquire, and the percentage of the Acquisition Costs Devon is
required to pay, shall be proportionately reduced by the percentage of the NEBU
Property Interest acquired by Burlington.

         The Purchaser has engaged in preliminary discussions with Burlington 
concerning the Purchaser's acquisition of the Working Interest from Burlington. 
Because of the preliminary nature of the discussions with Burlington, there can 
be no assurance as to when, if ever, the Purchaser might obtain the Working 
Interest from Burlington.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS

      (a)(16)  Letter Agreement between San Juan Partners, L.L.C. and Devon
               Acquisition Corporation
 
                                      14
<PAGE>   15
                                  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: July 13, 1998                    SAN JUAN PARTNERS, L.L.C.
     --------------------            
                                     
                                     
                                     By: /s/ C. N. O'Sullivan    
                                        ----------------------------------------
                                     Name:   C. N. O'Sullivan, 
                                             by Scott W. Smith Attorney-in-Fact
                                     Title:  President - O'Sullivan Oil & Gas
                                             Company, Inc., Manager
                                     
                                     
                                     ENCAP ENERGY CAPITAL FUND III, L.P.
                                     
                                     
                                     By: /s/ D. Martin Phillips
                                        ----------------------------------------
                                     Name:   D. Martin Phillips
                                     Title:  Managing Director
                                     
                                     
                                     
                                     ENCAP ENERGY ACQUISITION III-B, INC.
                                     
                                     
                                     By: /s/ D. Martin Phillips
                                        ----------------------------------------
                                     Name:   D. Martin Phillips
                                     Title:  Managing Director
                                     
                                     
                                     ECIC CORPORATION
                                     
                                     
                                     By: /s/ D. Martin Phillips
                                        ----------------------------------------
                                     Name:   D. Martin Phillips
                                     Title:  Director
                                     
                                     
                                     
                                     BOCP ENERGY PARTNERS, L.P.
                                     
                                     

                                     By: /s/ D. Martin Phillips
                                        ----------------------------------------
                                     Name:   D. Martin Phillips
                                     Title:  Managing Director
                                     
                                     
                                     
                                     FIRST UNION INVESTORS, INC.
                                     
                                     
                                     By: /s/ Ted A. Gardner
                                        ----------------------------------------
                                     Name:   Ted A. Gardner
                                     Title:  Managing Partner




                                       15
<PAGE>   16
 
                                     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/ ELIZABETH HOLDERFIELD
                                        ----------------------------------------
                                     Name:   Elizabeth Holderfield
                                     Title:  Secretary
                                     
                                     
                                     
                                      /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>   17
                                   SCHEDULE 1

         The Purchaser has engaged in the following transactions in Units since
June 15, 1998, the date of the most recent filing by the Purchaser and the
Parents on Schedule 13D.

<TABLE>
<CAPTION>
                                                                     Where and How
Transaction Date     Number of Units     Price Per Unit         Transaction was Effected
- ----------------     ---------------     --------------     --------------------------------
<S>                  <C>                 <C>                <C>
 June 15, 1998               200         $    8.94          Open market acquisition
 June 15, 1998             8,400         $    9.00          Open market acquisition
 June 15, 1998            21,600         $    9.07          Open market acquisition
 June 16, 1998             4,000         $    9.07          Open market acquisition
 June 16, 1998             3,800         $    9.00          Open market acquisition
 June 17, 1998             5,000         $    9.07          Open market acquisition
 June 17, 1998               400         $    9.00          Open market acquisition
 June 18, 1998             4,000         $    8.94          Open market acquisition
 June 18, 1998             1,000         $    9.00          Open market acquisition
 June 19, 1998               700         $    9.00          Open market acquisition
 June 22, 1998            21,000         $    9.13          Open market acquisition
 June 22, 1998             2,000         $    9.07          Open market acquisition
 June 22, 1998               500         $    9.00          Open market acquisition
 July 10, 1998           356,228         $    9.00          Privately negotiated transaction
 July 10, 1998             5,000         $    8.94          Open market acquisition
</TABLE>                  

<PAGE>   18
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
Exhibit
Number         Description
- -------        -----------
<S>            <C>
99.(a)(16)     Letter Agreement between San Juan Partners, L.L.C. and Devon
               Acquisition Corporation
</TABLE>

<PAGE>   1
EXHIBIT 99(a)(16)

                     [SAN JUAN PARTNERS, L.L.C. LETTERHEAD]



July 9, 1998


Devon Acquisition Corporation
20 N. Broadway, Suite 1500
Oklahoma City, Oklahoma 73101-3611

Attention:     Ms. Marian Moon

Re:  Offer to Purchase
     Units of Burlington Resources Coal Seam Gas Royalty Trust

Gentlemen:

This letter agreement ("Agreement"), upon execution by the parties hereto,
shall evidence and confirm the agreement between San Juan Partners, L.L.C.
("SJP") and Devon Acquisition Corporation ("Devon") concerning the purchase and
sale of certain Burlington Resources Coal Seam Gas Royalty Trust ("BRU") units
owned by Devon and the possible right to purchase an undivided working interest
in the Fruitland coal formation of the Northeast Blanco Unit ("NEBU"), all as
more specifically set forth below:

     1.   Upon execution of this Agreement by all parties, SJP shall purchase
          from Devon 356,228 BRU units at a price of $9.00 per unit. Devon
          warrants that its units are free and clear of any encumbrances and
          that it does not own other BRU units over and above this figure. In
          conjunction with this transaction, SJP will wire transfer the sum of
          $3,206,052 to Devon and Devon will deliver properly endorsed stock
          certificates to SJP or its designee. Once this transaction is complete
          and so long as SJP continues to own 50% or more of the outstanding BRU
          units, Devon shall not acquire any additional units of BRU without the
          written consent of SJP.

     2.   As of the date hereof, SJP warrants that it owns, or has sole voting
          control over, 4,969,540 units of BRU. Therefore, upon the purchase of
          Devon's units, SJP will own, and/or have sole voting control over
          5,325,768 units.
<PAGE>   2
Offer to Purchase
July 9, 1998
Page 2


     3.   SJP and Devon both represent and warrant that they have the right and
          authority to enter into this Agreement, that the terms hereof have 
          been duly approved by the proper representatives of the respective 
          parties and that neither the execution of this Agreement, nor the 
          compliance with the provisions hereof, will violate any law, statute, 
          rule or regulation of any governmental authority or regulatory body.

     4.   Within eighteen (18) months after execution of this Agreement, should
          SJP be successful in acquiring the underlying working interest
          associated with the BRU (the "Working Interest") from Burlington
          Resources, Inc. ("Burlington") and BRU is subsequently consolidated
          into SJP, then within twenty (20) working days after such
          consolidation is complete and BRU has been terminated, SJP shall
          provide written notice to Devon of such event. In such notice, SJP
          will provide a detailed breakdown of its direct out-of-pocket expenses
          reasonably incurred in the acquisition of the BRU units and the
          Working Interest, including financing costs (the "Acquisition Costs").
          Upon receipt of such notice, Devon, or its designee, shall have ten
          (10) working days to notify SJP in writing of Devon's intent to
          purchase an undivided 6.70% of the 19.6% working interest/16.5% net
          revenue interest (the "NEBU Property Interest") owned by SJP by paying
          6.70% of the Acquisition Costs.  SJP shall deliver the NEBU Property
          Interest to Devon free and clear of any liens and encumbrances.

     5.   Should Devon elect to exercise its purchase option, then the parties
          shall enter into a Purchase and Sale Agreement (PSA) which is
          reasonably acceptable to both parties.  The closing of said
          transaction shall take place as soon as practicable and in accordance
          with such agreement after execution of the PSA.  In no event shall the
          closing of this transaction take place later than sixty (60) working
          days after Devon makes its election. Should Devon fail to respond
          after timely receiving the notice from SJP, then it shall be
          considered that Devon has elected to forfeit its purchase option.
<PAGE>   3
Offer to Purchase
July 9, 1998
Page 3

     6.        Notwithstanding anything herein to the contrary, should SJP enter
               into an agreement with Burlington whereby SJP, upon consolidation
               of the BRU with the Working Interest as described above, is
               obligated to sell a percentage of the NEBU Property Interest on
               the same basis as set forth in Paragraph 4 above, then the NEBU
               Property Interest which Devon has the right to acquire, and the
               percentage of the Acquisition Costs Devon is required to pay,
               shall be proportionately reduced by the percentage of the NEBU
               Property Interest acquired by Burlington.
     
     7.        Upon purchase of the BRU units, both Devon and SJP shall have the
               right to make press releases outlining all or a portion of the
               terms set forth herein. Both parties shall have the right to
               review the other's press release and use reasonable efforts to
               promptly agree upon the text thereof prior to issuance of the
               release.

     8.        This Agreement may be prepared in multiple counterparts, each of 
               which may constitute an original Agreement between the parties.

If the foregoing correctly reflects the understanding between the SJP and Devon,
then please indicate your acceptance by executing this letter in the space
provided below and returning same via fax to the attention of the undersigned at
the number shown above.

Very truly yours,

SAN JUAN PARTNERS, L.L.C.

/s/ SCOTT W. SMITH

Scott W. Smith
Attorney-in-fact for C. N. O'Sullivan, Manager

cno/ncy

ACCEPTED and AGREED UPON 
this 10th day of July, 1998.

DEVON ACQUISITION CORPORATION

/s/ DUKE R. LIGON
- ----------------------------------
By: Duke R. Ligon
    ------------------------------
Title: V.P. and General Counsel
      ----------------------------


 


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