BURLINGTON RESOURCES COAL SEAM GAS ROYALTY TRUST
SC 13D/A, 1998-04-13
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. 18

                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)

                                 APRIL 9, 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                         4,661,440 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0 Units
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 52.97%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         4,661,440 Units
          OWNED BY                 ------------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   ------------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             4,661,440 Units
- -----------------------------------------------------------------------------------------------------------------------
                               AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
              11

                                  4,661,440 Units
- -----------------------------------------------------------------------------------------------------------------------
                               CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
              12

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

                                  52.97%
- -----------------------------------------------------------------------------------------------------------------------
                               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                         4,661,440 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 52.97%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         4,661,440 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 52.97%
- ----------------------------------------------------------------------------------------------------------------------
                              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                        4,661,440 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                           0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                            4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 52.97%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         4,661,440 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 52.97%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         4,661,440 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 52.97%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         4,661,440 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 52.97%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         4,661,440 Units
          OWNED BY                 -----------------------------------------------------------------------------------

            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 52.97%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         4,661,440 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 52.97%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         4,661,440 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                            4,661,440  Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 52.97%
- ----------------------------------------------------------------------------------------------------------------------
                              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                         4,661,440 Units
          OWNED BY                 -----------------------------------------------------------------------------------
            EACH                           SOLE DISPOSITIVE POWER
          REPORTING                9
           PERSON                            0
            WITH                   -----------------------------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                   10
                                             4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             11
                                 4,661,440 Units
- ----------------------------------------------------------------------------------------------------------------------
                              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                [ ]
             12
- ----------------------------------------------------------------------------------------------------------------------
                              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             13
                                 52.97%
- ----------------------------------------------------------------------------------------------------------------------
                              TYPE OF REPORTING PERSON*
             14
                                 IN
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>





                                      13
<PAGE>   14
         This Amendment No. 18 amends the Statement on Schedule 13D of San Juan
Partners, L.L.C., a Texas limited liability company (the "Purchaser"), and
EnCap Energy Capital Fund III, L.P., a Texas limited partnership ("EnCap
Energy"), EnCap Energy Acquisition III-B, Inc., a Texas corporation ("EnCap
B"), ECIC Corporation, a Texas corporation ("ECIC"), BOCP Energy Partners,
L.P., a Texas limited partnership ("BOCP"),  First Union Investors, Inc. a
North Carolina corporation ("First Union Investors"), Andover Group, Inc., a
Texas corporation ("Andover"), Charles T. McCord III, O'Sullivan Oil & Gas
Company, Inc., a Texas corporation ("O'Sullivan Oil"), Christopher P. Scully,
Scott W. Smith Funding, L.L.C., a Texas limited liability company ("Smith
Funding"), and John V. Whiting (EnCap Energy, EnCap B, ECIC, BOCP, First Union
Investors, Andover, McCord, O'Sullivan Oil, Scully, Smith Funding and Whiting
collectively referred to herein as "Parents") with respect to Units of
Beneficial Interest (the "Units") of Burlington Resources Coal Seam Gas Royalty
Trust, a Delaware business trust (the "Trust").

Item 4.  PURPOSE OF THE TRANSACTION

     Item 4 is amended as follows:

     Because the Purchaser currently holds more than 50% of the outstanding
Units, the Purchaser could remove the Trustee pursuant to the Trust Agreement.
The Purchaser has no current plan to remove the Trustee.

     The Purchaser has acquired the Units for investment purposes and may
acquire additional Units either through open market or privately negotiated
acquisitions.  If, as a result of such acquisitions, the Purchaser acquires
66-2/3% of the outstanding Units, the Purchaser would have the power to cause
the termination of the Trust without the affirmative vote of any other
outstanding Units.  The Purchaser has no current plan to seek the termination of
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 April 9, 1998, the
Purchaser beneficially owned 4,661,440 Units consisting approximately 52.97% of
the currently outstanding Units (the percentage of Units being based upon
8,800,000 Units outstanding as of March 13, 1998, as set forth in the Trust's
Annual Report on Form 10-K for the fiscal year ended December 31, 1997).


         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 4,661,440 Units owned by the Purchaser and may be deemed to be the
beneficial owner thereof.

         (c)     Since April 2, 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.


                                      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: April 13, 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:  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




                                       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/ 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>   17
                                   SCHEDULE 1

         The Purchaser has engaged in the following transactions in Units since
April 2, 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>
 April 8, 1998             1,000         $    9.25          Open market acquisition
 April 8, 1998            49,000              9.38          Open market acquisition
 April 8, 1998             8,300              9.38          Open market acquisition
 April 9, 1998           454,000              9.63          Open market acquisition
 April 9, 1998             4,000              9.63          Open market acquisition
 April 9, 1998             7,000              9.44          Open market acquisition         

</TABLE>



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