DEVON ENERGY CORP /OK/
SC 14D1, 1998-02-13
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
 
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
 
                             ---------------------
 
                                 SCHEDULE 14D-1

           TENDER OFFER STATEMENT PURSUANT TO SECTION 14(d)(1) OF THE
                        SECURITIES EXCHANGE ACT OF 1934
 
                              BURLINGTON RESOURCES
                          COAL SEAM GAS ROYALTY TRUST
                           (Name of Subject Company)
 
                         DEVON ACQUISITION CORPORATION
                            DEVON ENERGY CORPORATION
                                   (Bidders)
 
                          UNITS OF BENEFICIAL INTEREST
                         (Title of Class of Securities)
 
                                  122016 10 8
                     (CUSIP Number of Class of Securities)
 
                                 MARIAN J. MOON
                            DEVON ENERGY CORPORATION
                         20 NORTH BROADWAY, SUITE 1500
                          OKLAHOMA CITY, OK 73102-8260
                                 (405) 235-3611
 
                                With a Copy To:
                            C. KEVIN BARNETTE, ESQ.
                    SKADDEN, ARPS, SLATE, MEAGHER & FLOM LLP
                            1440 NEW YORK AVENUE, NW
                              WASHINGTON, DC 20005
                                 (202) 371-7000
        (Name, Addresses and Telephone Numbers of Persons Authorized to
            Receive Notices and Communications on Behalf of Bidder)
 
                           CALCULATION OF FILING FEE
 
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------
            TRANSACTION VALUATION                            AMOUNT OF FILING FEE
<C>                                             <C>
                $77,000,000(1)                                    $15,400(1)
- ----------------------------------------------------------------------------------------------
</TABLE>
 
(1) For purposes of calculating the fee only. The transaction valuation amount
    assumes the purchase of 8,800,000 Units of Beneficial Interest of the Trust
    at $8.75 per Unit. The filing fee is calculated in accordance with Rule 0-11
    of the Securities Exchange Act of 1934 as 1/50th of 1% of the transaction
    valuation.
 
[ ]  Check box if any part of the fee is offset as provided by Rule 0-11(a)(2)
     and identify the filing with which the offsetting fee was previously paid.
     Identify the previous filing by registration statement number, or the form
     or schedule and the date of its filing.
 
<TABLE>
           <S>                           <C>                    <C>             <C>
           Amount Previously Paid:       Not applicable         Filing Party:   Not applicable
           Form or Registration No.:     Not applicable         Date Filed:     Not applicable
</TABLE>
 
================================================================================
<PAGE>   2
 
     This Tender Offer Statement on Schedule 14D-1 relates to the tender offer
by Devon Acquisition Corporation, a Delaware corporation (the "Purchaser") and a
wholly-owned subsidiary of Devon Energy Corporation, an Oklahoma corporation
(the "Parent"), to purchase any and all Units of Beneficial Interest (the
"Units") of the Trust (as defined below), at a price of $8.75 per Unit, net to
the seller in cash, without interest thereon, upon the terms and subject to the
conditions set forth in the Offer to Purchase dated February 13, 1998 (the
"Offer to Purchase"), and in the related Letter of Transmittal, both as amended
from time to time (which together constitute the "Offer").
 
ITEM 1. SECURITY AND SUBJECT COMPANY
 
     (a) The name of the subject company is Burlington Resources Coal Seam Gas
Royalty Trust, a Delaware business trust (the "Trust"). The principal executive
offices of the Trust are located at the offices of NationsBank of Texas, N.A.,
901 Main Street, Suite 1700, Dallas, Texas 75202.
 
     (b) The class of securities being sought is Units of Beneficial Interest of
the Trust. The information set forth under "INTRODUCTION" of the Offer to
Purchase is incorporated herein by reference.
 
     (c) The information set forth under "THE TENDER OFFER -- 8. Price Range of
Units; Cash Distributions" of the Offer to Purchase is incorporated herein by
reference.
 
ITEM 2. IDENTITY AND BACKGROUND
 
     (a)-(g) This Statement is being filed by the Purchaser and the Parent. The
information set forth under "THE TENDER OFFER -- 7. Certain Information
Concerning the Purchaser and Devon" and Schedule I of the Offer to Purchase is
incorporated herein by reference.
 
ITEM 3. PAST CONTACTS, TRANSACTIONS OR NEGOTIATIONS
 
     (a) and (b) The information set forth under "THE TENDER OFFER -- 7. Certain
Information Concerning the Purchaser and Devon"; "THE TENDER OFFER -- 11.
Background of the Offer; Past Contacts, Transactions or Negotiations with the
Trust" and "THE TENDER OFFER -- 16. Certain Transactions" of the Offer to
Purchase is incorporated herein by reference.
 
ITEM 4. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION
 
     (a) and (b) The information set forth under "THE TENDER OFFER -- 10.
Financing of the Offer" of the Offer to Purchase is incorporated herein by
reference.
 
     (c) Not applicable.
 
ITEM 5. PURPOSE OF THE TENDER OFFER AND PLANS OR PROPOSALS OF THE BIDDER
 
     (a)-(g) The information set forth under "INTRODUCTION", "THE TENDER
OFFER -- 12. Purpose and Structure of the Offer; Plans for the Trust" and "THE
TENDER OFFER -- 13. Effect of the Offer on the Market for Units; NYSE Listing
and Exchange Act Registration; Margin Regulations" of the Offer to Purchase is
incorporated herein by reference.
 
ITEM 6. INTEREST IN SECURITIES OF THE SUBJECT COMPANY
 
     (a) and (b) The information set forth under "THE TENDER OFFER -- 7. Certain
Information Concerning the Purchaser and Devon" of the Offer to Purchase is
incorporated herein by reference.
 
ITEM 7. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
        THE SUBJECT COMPANY'S SECURITIES
 
     The information set forth under "THE TENDER OFFER -- 7. Certain Information
Concerning the Purchaser and Devon"; "THE TENDER OFFER -- 11. Background of the
Offer; Past Contacts, Transactions or Negotiations with the Trust", "THE TENDER
OFFER -- 12. Purpose and Structure of the Offer;
                                        2
<PAGE>   3
 
Plans for the Trust" and "THE TENDER OFFER -- 16. Certain Transactions" of the
Offer to Purchase is incorporated herein by reference.
 
ITEM 8. PERSONS RETAINED, EMPLOYED OR TO BE COMPENSATED
 
     The information set forth under "INTRODUCTION" and "THE TENDER OFFER -- 18.
Fees and Other Expenses" of the Offer to Purchase is incorporated herein by
reference.
 
ITEM 9. FINANCIAL STATEMENTS OF CERTAIN BIDDERS
 
     The information set forth under "THE TENDER OFFER - 7. Certain Information
Concerning the Purchaser and Devon" of the Offer to Purchase is incorporated
herein by reference.
 
ITEM 10. ADDITIONAL INFORMATION
 
     (a) Not applicable
 
     (b) and (c) The information set forth under "THE TENDER OFFER -- 17.
Certain Legal Matters" of the Offer to Purchase is incorporated herein by
reference.
 
     (d) The information set forth under "THE TENDER OFFER -- 13. Effect of the
Offer on the Market for Units; NYSE Listing and Exchange Act Registration;
Margin Regulations" of the Offer to Purchase is incorporated herein by
reference.
 
     (e) Not applicable.
 
     (f) The information set forth in the Offer to Purchase and the related
Letter of Transmittal, copies of which are attached hereto as Exhibits (a)(1)
and (a)(2), respectively, is incorporated herein by reference in its entirety.
 
ITEM 11. MATERIAL TO BE FILED AS EXHIBITS
 
<TABLE>
<CAPTION>
        EXHIBIT
          NO.                                      DOCUMENT
        -------                                    --------
<C>                      <S>
       99.(a)(1)         -- Offer to Purchase dated February 13, 1998
       99.(a)(2)         -- Letter of Transmittal
       99.(a)(3)         -- Notice of Guaranteed Delivery
       99.(a)(4)         -- Letter to Brokers, Dealers, Commercial Banks, Trust
                            Companies and Other Nominees
       99.(a)(5)         -- Letter to Clients for Use by Brokers, Dealers, Commercial
                            Banks, Trust Companies and Other Nominees
       99.(a)(6)         -- Guidelines for Certification of Taxpayer Identification
                            Number on Substitute Form W-9
       99.(a)(7)         -- Press Release, issued February 13, 1998
       99.(a)(8)         -- Summary Advertisement, dated February 13, 1998
       99.(a)(9)         -- Notice of Withdrawal
       99.(a)(10)        -- Press Release, issued February 11, 1998
       99.(b)            -- Credit Agreement dated August 30, 1996, among Devon
                            Energy Corporation (Nevada), as Borrower, Devon Energy
                            Corporation and Devon Energy Operating Corporation, as
                            Guarantors, NationsBank of Texas, N.A., as Agent, and
                            NationsBank of Texas, N.A., Bank One, Texas, N.A., Bank
                            of Montreal and First Union National Bank of North
                            Carolina, as Lenders (incorporated by reference to
                            Exhibit 10.1 to the Quarterly Report on Form 10-Q of
                            Devon Energy Corporation for the quarter ended September
                            30, 1996).
       99.(c)            -- Not applicable
       99.(d)            -- Not applicable
       99.(e)            -- Not applicable
       99.(f)            -- Not applicable
</TABLE>
 
                                        3
<PAGE>   4
 
                                   SIGNATURE
 
     After due inquiry and to the best of their knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.
 
                                            Date: February 13, 1998
 
                                            DEVON ACQUISITION CORPORATION
 
                                            By: /s/ H. Allen Turner
                                              ----------------------------------
                                              Name: H. Allen Turner
                                              Title: Vice President
 
                                            DEVON ENERGY CORPORATION
 
                                            By: /s/ H. Allen Turner
                                              ----------------------------------
                                              Name: H. Allen Turner
                                              Title: Vice President
 
                                        4
<PAGE>   5
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
        EXHIBIT
          NO.                                      DOCUMENT
        -------                                    --------
<C>                      <S>
       99.(a)(1)         -- Offer to Purchase dated February 13, 1998
       99.(a)(2)         -- Letter of Transmittal
       99.(a)(3)         -- Notice of Guaranteed Delivery
       99.(a)(4)         -- Letter to Brokers, Dealers, Commercial Banks, Trust
                            Companies and Other Nominees
       99.(a)(5)         -- Letter to Clients for Use by Brokers, Dealers, Commercial
                            Banks, Trust Companies and Other Nominees
       99.(a)(6)         -- Guidelines for Certification of Taxpayer Identification
                            Number on Substitute Form W-9
       99.(a)(7)         -- Press Release, issued February 13, 1998
       99.(a)(8)         -- Summary Advertisement, dated February 13, 1998
       99.(a)(9)         -- Notice of Withdrawal
       99.(a)(10)        -- Press Release, issued February 11, 1998
       99.(b)            -- Credit Agreement dated August 30, 1996, among Devon
                            Energy Corporation (Nevada), as Borrower, Devon Energy
                            Corporation and Devon Energy Operating Corporation, as
                            Guarantors, NationsBank of Texas, N.A., as Agent, and
                            NationsBank of Texas, N.A., Bank One, Texas N.A., Bank of
                            Montreal and First Union National Bank of North Carolina,
                            as Lenders (incorporated by reference to Exhibit 10.1 to
                            the Quarterly Report on Form 10-Q of Devon Energy
                            Corporation for the quarter ended September 30, 1996).
       99.(c)            -- Not applicable
       99.(d)            -- Not applicable
       99.(e)            -- Not applicable
       99.(f)            -- Not applicable
</TABLE>
 
                                        5

<PAGE>   1
 
================================================================================
                           OFFER TO PURCHASE FOR CASH
              ANY AND ALL OUTSTANDING UNITS OF BENEFICIAL INTEREST
                                       OF
 
                              BURLINGTON RESOURCES
 
                          COAL SEAM GAS ROYALTY TRUST
                                       AT
                               $8.75 NET PER UNIT
                                       BY
 
                         DEVON ACQUISITION CORPORATION
                          A WHOLLY-OWNED SUBSIDIARY OF
 
                            DEVON ENERGY CORPORATION
 
  THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
         TIME, ON FRIDAY, MARCH 13, 1998, UNLESS THE OFFER IS EXTENDED.
 
     THE OFFER IS NOT CONDITIONED UPON ANY MINIMUM NUMBER OF UNITS BEING
TENDERED OR UPON THE OBTAINING OF FINANCING. THE OFFER IS SUBJECT TO CERTAIN
OTHER CONDITIONS THAT ARE CONTAINED IN THIS OFFER TO PURCHASE. SEE "THE TENDER
OFFER -- 14. CERTAIN CONDITIONS OF THE OFFER."
 
                                   IMPORTANT
 
     Any Unit holder desiring to tender all or any portion of his or her Units
should either (1) complete and sign the Letter of Transmittal or a facsimile
copy thereof in accordance with the instructions in the Letter of Transmittal,
have such Unit holder's signature thereon guaranteed if required by Instruction
1 to the Letter of Transmittal, mail or deliver the Letter of Transmittal (or
facsimile thereof), or, in the case of a book-entry transfer effected pursuant
to the procedure set forth in "THE TENDER OFFER -- 2. Procedures for Tendering
Units," an Agent's Message (as defined herein), and any other required documents
to Harris Trust Company of New York (the "Depositary") and either deliver the
certificates for such Units to the Depositary along with the Letter of
Transmittal (or facsimile thereof) or deliver such Units pursuant to the
procedure for book-entry transfer set forth in "THE TENDER OFFER -- 2.
Procedures for Tendering Units," or (2) request his or her broker, dealer,
commercial bank, trust company or other nominee to effect the transaction for
him or her. A Unit holder having Units registered in the name of a broker,
dealer, commercial bank, trust company or other nominee must contact such
broker, dealer, commercial bank, trust company or other nominee if he or she
desires to tender such Units.
 
     A Unit holder who desires to tender Units and whose certificates for such
Units are not immediately available, or who cannot comply with the procedures
for book-entry transfer on a timely basis, may tender such Units by following
the procedure for guaranteed delivery set forth in "THE TENDER OFFER -- 2.
Procedures for Tendering Units."
 
     Requests for assistance or for additional copies of this Offer to Purchase,
the Letter of Transmittal or the Notice of Guaranteed Delivery may be directed
to D.F. King & Co., Inc. (the "Information Agent") or Smith Barney Inc. (now
associated with Salomon Brothers Inc and collectively with Salomon Brothers Inc
doing business as Salomon Smith Barney and sometimes referred to herein as the
"Dealer Manager") at their respective addresses and telephone numbers set forth
on the back cover of this Offer to Purchase. A Unit holder may also contact
brokers, dealers, commercial banks or trust companies for assistance concerning
the Offer.
                             ---------------------
 
                      The Dealer Manager for the Offer is:
                              SALOMON SMITH BARNEY
 
                               February 13, 1998
================================================================================
<PAGE>   2
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Introduction................................................  1
The Tender Offer............................................  2
   1. Terms of Offer........................................  2
   2. Procedures for Tendering Units........................  3
   3. Withdrawal Rights.....................................  5
   4. Acceptance for Payment and Payment for Units..........  6
   5. Certain U.S. Federal Income Tax Considerations........  7
   6. Certain Information Concerning the Trust..............  8
   7. Certain Information Concerning the Purchaser and
      Devon.................................................  10
   8. Price Range of Units; Cash Distributions..............  12
   9. Distributions.........................................  13
  10. Financing of the Offer................................  13
  11. Background of the Offer; Past Contacts, Transactions
      or Negotiations with the Trust........................  14
  12. Purpose and Structure of the Offer; Plans for the
      Trust.................................................  14
  13. Effect of the Offer on the Market for Units; NYSE
      Listing and Exchange Act Registration; Margin
      Regulations...........................................  15
  14. Certain Conditions of the Offer.......................  16
  15. Appraisal Rights......................................  17
  16. Certain Transactions..................................  17
  17. Certain Legal Matters.................................  20
  18. Fees and Other Expenses...............................  20
  19. Miscellaneous.........................................  21
</TABLE>
 
                                        i
<PAGE>   3
 
TO THE OWNERS OF UNITS OF BENEFICIAL INTEREST OF
BURLINGTON RESOURCES COAL SEAM GAS ROYALTY TRUST:
 
                                  INTRODUCTION
 
     Devon Acquisition Corporation, a Delaware corporation (the "Purchaser") and
a wholly-owned subsidiary of Devon Energy Corporation, an Oklahoma corporation
("Devon"), hereby offers to purchase any and all outstanding Units of Beneficial
Interest ("Units") of Burlington Resources Coal Seam Gas Royalty Trust (the
"Trust"), at a price of $8.75 per Unit, net to the seller in cash, without
interest (the "Purchase Price"), upon the terms and subject to the conditions
set forth in this Offer to Purchase and in the related Letter of Transmittal,
both as amended from time to time (which together constitute the "Offer").
Tendering Unit holders will not be obligated to pay brokerage fees or
commissions or, except as set forth in the Letter of Transmittal, stock transfer
taxes on the purchase of the Units by the Purchaser pursuant to the Offer. The
Purchaser will pay all charges and expenses of Salomon Smith Barney, as Dealer
Manager (the "Dealer Manager"), Harris Trust Company of New York, as Depositary
(the "Depositary"), and D.F. King & Co., Inc., as Information Agent (the
"Information Agent"), incurred in connection with the Offer. See "THE TENDER
OFFER -- 18. Fees and Other Expenses."
 
     If the record date for the regular March 1998 quarterly cash distribution
and associated tax credits declared by the Trust precedes the transfer to the
Purchaser on the Trust's transfer records of the Units purchased pursuant to the
Offer, holders of record of Units on such record date (including holders who
have tendered Units pursuant to the Offer) will be entitled to receive and
retain such regular quarterly cash distribution and associated tax credits on
such Units. The Purchaser anticipates that March 13, 1998 (the date on which the
Offer is initially scheduled to expire) will be after the record date for the
Trust's normal quarterly distribution in March 1998. See "THE TENDER
OFFER -- 8. Price Range of Units; Cash Distributions."
 
     The purpose of the Offer is for the Purchaser to acquire a significant
number of the outstanding Units as an investment.
 
     THE OFFER IS NOT CONDITIONED UPON ANY MINIMUM NUMBER OF UNITS BEING
TENDERED OR UPON THE OBTAINING OF FINANCING. THE OFFER IS SUBJECT TO CERTAIN
OTHER CONDITIONS THAT ARE CONTAINED IN THIS OFFER TO PURCHASE. SEE "THE TENDER
OFFER -- 14. CERTAIN CONDITIONS OF THE OFFER."
 
     Based on a Schedule 14D-1 filed with the Commission on or about January 20,
1998 by San Juan Partners, L.L.C. ("SJP") and certain other parties named
therein, as of February 12, 1998, the Purchaser believes that (i) SJP is
offering to purchase 5,446,860 Units at a price of $8.25 per Unit (the "SJP
Offer") and (ii) the SJP Offer is scheduled to expire at 12:00 Midnight, New
York City time, on Tuesday, February 17, 1998. Holders of Units who have
previously tendered Units pursuant to the SJP Offer and who now wish to tender
such Units pursuant to the Offer will first need to withdraw such Units from the
SJP Offer before such Units can be tendered pursuant to the Offer. Holders of
Units who desire assistance in withdrawing Units tendered pursuant to the SJP
Offer may contact the Dealer Manager or the Information Agent at their
respective addresses and telephone numbers set forth on the back cover of this
Offer to Purchase.
 
     The Purchaser and Devon have filed a Schedule 14D-1 with the Securities and
Exchange Commission (the "Commission") in connection with the Offer (the
"Purchaser Schedule 14D-1"). The Purchaser Schedule 14D-1 contains additional
information, including exhibits, relating to the Offer, the Purchaser and Devon
and may be inspected and copies of such document may be obtained at the same
places and in the same manner as set forth in "THE TENDER OFFER -- 6. Certain
Information Concerning the Trust."
 
     THIS OFFER TO PURCHASE AND THE LETTER OF TRANSMITTAL CONTAIN IMPORTANT
INFORMATION WHICH SHOULD BE READ CAREFULLY BEFORE ANY DECISION IS MADE WITH
RESPECT TO THE OFFER.
 
                                        1
<PAGE>   4
 
                                THE TENDER OFFER
 
     1. TERMS OF OFFER. Upon the terms and subject to the conditions of the
Offer (including, if the Offer is extended or amended, the terms and conditions
of any such extension or amendment), the Purchaser will accept for payment and
pay for all Units that are validly tendered prior to the Expiration Date (as
hereinafter defined) and not properly withdrawn in accordance with the
procedures set forth in "THE TENDER OFFER -- 3. Withdrawal Rights." The term
"Expiration Date" means 12:00 midnight, New York City time, on Friday, March 13,
1998, unless and until the Purchaser, in its sole discretion, shall have
extended the period of time during which the Offer is open, in which event the
term "Expiration Date" shall mean the latest time and date on which the Offer,
as so extended by the Purchaser, shall expire.
 
     SATISFACTION OF CERTAIN CONDITIONS. The Offer is subject to certain
conditions. See "THE TENDER OFFER -- 14. Certain Conditions of the Offer." If
any or all of the conditions set forth in "THE TENDER OFFER -- 14. Certain
Conditions of the Offer" are not satisfied prior to the Expiration Date, the
Purchaser reserves the right (but shall not be obligated) in its sole discretion
to (i) decline to purchase any of the Units tendered in the Offer, terminate the
Offer and return all tendered Units to the tendering Unit holders, (ii) waive or
amend any or all conditions to the Offer to the extent permitted by applicable
law and, subject to complying with applicable rules and regulations of the
Commission, purchase all Units validly tendered, (iii) extend the Offer and,
subject to the right of the Unit holders to withdraw Units until the Expiration
Date, retain the Units that have been tendered during the period or periods for
which the Offer is extended or (iv) amend the Offer.
 
     MODIFICATION OF CONSIDERATION. The Purchaser also reserves the right to
decrease the number of Units being sought or to increase or decrease the
consideration being offered in the Offer, subject to any requirement to extend
the period of time during which the Offer is open. Any such decrease in the
number of Units being sought or such increase or decrease in the consideration
being offered will be applicable to all Unit holders whose Units are accepted
for payment pursuant to the Offer. The Purchaser has no present intention of
exercising any such right, except that it is likely that the Purchaser would
reduce the consideration offered in the Offer if the Offer is extended beyond
the record date for the regular second quarter 1998 cash distribution and
associated tax credits declared by the Trust.
 
     RIGHT TO EXTEND OR AMEND OFFER. Subject to the applicable rules of the
Commission, the Purchaser expressly reserves the right, in its sole discretion,
at any time or from time to time, (i) to extend the period of time during which
the Offer is open and thereby delay acceptance for payment of, and the payment
for, all Units validly tendered by giving oral or written notice of such
extension to the Depositary and (ii) to amend the Offer in any respect, by
giving oral or written notice of such amendment to the Depositary. The rights
reserved by the Purchaser in this paragraph are in addition to the Purchaser's
rights to terminate the Offer pursuant to "THE TENDER OFFER -- 14. Certain
Conditions of the Offer." UNDER NO CIRCUMSTANCES WILL INTEREST BE PAID ON THE
PURCHASE PRICE FOR TENDERED UNITS, WHETHER OR NOT THE PURCHASER EXERCISES ITS
RIGHTS TO EXTEND THE OFFER.
 
     RESULT OF MATERIAL MODIFICATION. If the Purchaser makes a material change
in the terms of the Offer or in the information concerning the Offer or waives a
material condition of the Offer, the Purchaser will disseminate additional
tender offer materials and extend the Offer to the extent required by Rules
14d-4(c) and 14d-6(d) promulgated under the Securities Exchange Act of 1934, as
amended (the "Exchange Act"). The minimum period during which an offer must
remain open following material changes in the terms of the offer or information
concerning the offer, other than a change in price or a change in percentage of
securities sought, will depend upon the facts and circumstances, including the
relative materiality of the terms or information changed. With respect to a
change in price or a change in percentage of securities sought, if at the time
notice of such change is first published, sent or given to holders of such
Units, the Offer is scheduled to expire at any time earlier than the period
ending on the tenth business day from and including the date that such notice is
first so published, sent or given, the Offer will be extended at least until the
expiration of a ten business day period from the last such notice given. For
purposes of the Offer, a "business day" means any day other than a Saturday,
Sunday or federal holiday and consists of the time period from 12:01 a.m.
through 12:00 midnight, New York City time.
 
                                        2
<PAGE>   5
 
     ANNOUNCEMENTS. Any extension, amendment or termination will be followed as
promptly as practicable by public announcement thereof, the announcement in the
case of an extension to be issued no later than 9:00 a.m., New York City time,
on the next business day after the previously scheduled Expiration Date in
accordance with the public announcement requirements of Rule 14d-4(c)
promulgated under the Exchange Act. Without limiting the obligation of the
Purchaser under such rule or the manner in which the Purchaser may choose to
make any public announcement, the Purchaser currently intends to make
announcements by issuing a release to the PR Newswire.
 
     DELAY OF PAYMENTS. If the Purchaser extends the Offer, or if the Purchaser
(whether before or after its acceptance for payment of Units) is delayed in its
purchase of or payment for Units or is unable to pay for Units pursuant to the
Offer for any reason, then, without prejudice to the Purchaser's rights under
the Offer, the Depositary may retain tendered Units on behalf of the Purchaser,
and such Units may not be withdrawn except to the extent tendering Unit holders
are entitled to withdrawal rights as described in "THE TENDER
OFFER -- 3. Withdrawal Rights." However, the ability of the Purchaser to delay
the payment for Units that the Purchaser has accepted for payment is limited by
Rule 14e-1(c) under the Exchange Act, which requires that a bidder pay the
consideration offered or return the securities deposited by or on behalf of the
holders of securities promptly after the termination or withdrawal of such
bidder's offer.
 
     REQUEST FOR UNIT HOLDER LIST. A request has been made to NationsBank of
Texas, N.A. as Trustee of the Trust (the "Trustee"), for the use of the Trust's
Unit holder list and security position listings for the purpose of disseminating
the Offer to holders of Units. Once the Trust has provided such list and
listings or otherwise complied with such request, this Offer to Purchase and the
Letter of Transmittal and other relevant materials will be mailed to record
holders of Unit. Such materials will also be furnished to brokers, dealers,
commercial banks, trust companies and similar persons whose names, or the names
of whose nominees, appear on the Unit holder list or, if applicable, who are
listed as participants in a clearing agency's security position listing for
subsequent transmittal to beneficial owners of Units by the Purchaser.
 
     2. PROCEDURES FOR TENDERING UNITS.
 
     VALID TENDER OF UNITS. Except as set forth below, for Units to be validly
tendered pursuant to the Offer, a Letter of Transmittal (or manually signed
facsimile thereof), properly completed and duly executed, together with any
required signature guarantees, or an Agent's Message (as defined below) in
connection with a book-entry delivery of Units, and any other documents required
by the Letter of Transmittal, must be received by the Depositary at one of its
addresses set forth on the back cover page of this Offer to Purchase prior to
the Expiration Date. In addition, either (i) certificates for Units representing
tendered Units must be received by the Depositary along with the Letter of
Transmittal, or such Units must be tendered pursuant to the procedure for
book-entry transfer described below and a Book-Entry Confirmation (as defined
below) must be received by the Depositary, or (ii) the tendering Unit holder
must comply with the guaranteed delivery procedures set forth below, in each
case prior to the Expiration Date.
 
     BOOK-ENTRY TRANSFER. The Depositary will make a request to establish an
account with respect to the Units at each of The Depository Trust Company and
the Philadelphia Depository Trust Company (each a "Book-Entry Transfer Facility"
and collectively, the "Book-Entry Transfer Facilities") for purposes of the
Offer within two business days after the date of this Offer to Purchase, and any
financial institution which is a participant in a Book-Entry Transfer Facility's
system may make book-entry delivery of Units by causing such Book-Entry Transfer
Facility to transfer such units into the Depositary's account at such Book-Entry
Transfer Facility in accordance with its procedures for transfer. However,
although delivery of Units may be effected through book-entry transfer at a
Book-Entry Transfer Facility, the Letter of Transmittal (or facsimile thereof),
with any required signature guarantees, or an Agent's Message in connection with
a book-entry transfer, and any other required documents must, in any case, be
transmitted to and received by the Depositary at one of its addresses set forth
on the back cover page of this Offer to Purchase prior to the Expiration Date,
or the guaranteed delivery procedures described below must be complied with.
 
     Delivery of documents to a Book-Entry Transfer Facility in accordance with
its procedures does not constitute delivery to the Depositary. None of the
Purchaser, Devon, the Depositary, the Dealer Manager, the
 
                                        3
<PAGE>   6
 
Information Agent or any other person will assume any responsibility for, or
will be under any duty to give notification of, the failure by any Book-Entry
Transfer Facility to forward documents to the Depositary.
 
     SIGNATURE GUARANTEES. Signatures on all Letters of Transmittal must be
guaranteed by a firm that is a bank, broker, dealer, credit union, savings
association or other entity that is a member in good standing of the Securities
Transfer Agent's Medallion Program (each, an "Eligible Institution"), unless the
Units tendered thereby are tendered (i) by a registered holder of Units who has
not completed either the box labeled "Special Delivery Instructions" or the box
labeled "Special Payment Instructions" on the Letter of Transmittal or (ii) for
the account of an Eligible Institution. See Instruction 1 of the Letter of
Transmittal.
 
     If the certificates for Units are registered in the name of a person other
than the signer of the Letter of Transmittal, or if payment is to be made to, or
certificates for unpurchased Units are to be issued or returned to, a person
other than the registered owner, then the tendered certificates must be endorsed
or accompanied by appropriate transfer powers, in either case signed exactly as
the name or names of the registered owner or owners appear on the certificates,
with the signatures on the certificates or transfer powers guaranteed by an
Eligible Institution as described above. See Instructions 1 and 5 of the Letter
of Transmittal.
 
     GUARANTEED DELIVERY. If a Unit holder desires to tender Units pursuant to
the Offer and certificates for such Units are not immediately available, or time
will not permit all required documents to reach the Depositary prior to the
Expiration Date, or the procedures for book-entry transfer cannot be completed
on a timely basis, such Units may nevertheless be tendered if all of the
following guaranteed delivery procedures are duly complied with:
 
          (i) such tender is made by or through an Eligible Institution;
 
          (ii) a properly completed and duly executed Notice of Guaranteed
     Delivery, substantially in the form provided by the Purchaser herewith, is
     received by the Depositary, as provided below, prior to the Expiration
     Date; and
 
          (iii) the certificates (or a Book-Entry Confirmation (as hereinafter
     defined)) representing all tendered Units, in proper form for transfer,
     together with a properly completed and duly executed Letter of Transmittal
     (or facsimile thereof), with any required signature guarantees (or, in the
     case of a book-entry transfer, an Agent's Message) and any other documents
     required by the Letter of Transmittal, are received by the Depositary
     within three New York Stock Exchange ("NYSE") trading days after the date
     of the execution of such Notice of Guaranteed Delivery.
 
     The Notice of Guaranteed Delivery may be delivered by hand or transmitted
by telegram or facsimile transmission or mailed to the Depositary and must
include a guarantee by an Eligible Institution in the form set forth in such
Notice of Guaranteed Delivery.
 
     THE METHOD OF DELIVERY OF UNITS, THE LETTER OF TRANSMITTAL AND ANY OTHER
REQUIRED DOCUMENTS IS AT THE OPTION AND RISK OF THE TENDERING UNIT HOLDER. IF
DELIVERY IS BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY
INSURED, IS RECOMMENDED.
 
     Notwithstanding any other provision hereof, payment for the Units accepted
for payment pursuant to the Offer will in all cases be made only after timely
receipt by the Depositary of certificates for, or of Book-Entry Confirmation
with respect to, such Units, a properly completed and duly executed Letter of
Transmittal (or facsimile thereof), together with any signature guarantees (or,
in the case of a book-entry transfer, an Agent's Message) and any other
documents required by the Letter of Transmittal. Accordingly, payment might not
be made to all tendering Unit holders at the same time and will depend upon when
the foregoing materials are actually received by the Depositary.
 
     BACKUP FEDERAL TAX WITHHOLDING. Under the federal income tax laws, the
Depositary will be required to withhold 31% of the amount of any payments made
to certain Unit holders pursuant to the Offer. TO PREVENT BACKUP FEDERAL INCOME
TAX WITHHOLDING WITH RESPECT TO PAYMENT OF THE PURCHASE PRICE FOR UNITS SOLD
PURSUANT TO THE OFFER, A TENDERING
 
                                        4
<PAGE>   7
 
UNIT HOLDER MUST PROVIDE THE DEPOSITARY WITH HIS OR HER CORRECT TAXPAYER
IDENTIFICATION NUMBER, CERTIFY THAT HE OR SHE IS NOT SUBJECT TO BACKUP FEDERAL
INCOME TAX WITHHOLDING BY COMPLETING THE SUBSTITUTE FORM W-9 INCLUDED IN THE
LETTER OF TRANSMITTAL OR OTHERWISE ESTABLISH AN EXEMPTION TO BACKUP WITHHOLDING
IN ACCORDANCE WITH THE INSTRUCTIONS IN THE LETTER OF TRANSMITTAL.
 
     APPOINTMENT AS PROXY. By executing a Letter of Transmittal as set forth
above, a tendering Unit holder irrevocably appoints designees of the Purchaser
as such Unit holder's attorneys-in-fact and proxies, in the manner set forth in
the Letter of Transmittal, each with full power of substitution, to the full
extent of such Unit holder's rights with respect to the Units tendered by the
Unit holder and accepted for payment by the Purchaser and with respect to any
and all other Units or other securities, rights or distributions, other than
regular cash distributions and associated tax credits declared by the Trust
having a record date prior to the date of transfer to the Purchaser on the
Trust's transfer records of the Units tendered (such Units or other securities,
rights or distributions other than such regular cash distributions and
associated tax credits being referred to herein as "Special Distributions"),
issued or issuable in respect of such Units on or after the date of this Offer
to Purchase. All such powers of attorney and proxies shall be considered
irrevocable and coupled with an interest in the tendered Units. This appointment
will be effective if, when, and only to the extent that, the Purchaser accepts
Units for payment pursuant to the Offer. Upon such acceptance for payment, all
powers of attorney and proxies given by such Unit holder with respect to such
Units and any Special Distributions will, without further action, be revoked,
and no subsequent powers of attorney or proxies may be given by such Unit holder
(and, if given, will not be deemed effective). The designees of the Purchaser
will, with respect to the Units and any Special Distributions, be empowered to
exercise all voting and other rights of such Unit holder with respect to such
Units and any Special Distributions as they, in their sole discretion, may deem
proper at any meeting of the Unit holders, or any adjournment or postponement
thereof, or by written consent or otherwise. The Purchaser reserves the right to
require that, in order for Units to be deemed validly tendered, immediately upon
the Purchaser's acceptance for payment of such Units, the Purchaser must be able
to exercise full voting rights with respect to such Units, including voting at
any meeting of Unit holders.
 
     DETERMINATION OF VALIDITY. All questions as to the form of documents,
validity, eligibility (including time of receipt) and acceptance for payment of
any tender of Units pursuant to any of the procedures described above will be
determined by the Purchaser, in its sole discretion, whose determination will be
final and binding. The Purchaser reserves the absolute right to reject any or
all tenders of any Units determined by it not to be in proper form or the
acceptance of or payment for which may, in the opinion of the Purchaser's
counsel, be unlawful. The Purchaser also reserves the absolute right to waive
any of the conditions of the Offer or any defect or irregularity in any tender
of Units of any particular Unit holder, whether or not similar defects or
irregularities are waived in the case of other Unit holders.
 
     The Purchaser's interpretation of the terms and conditions of the Offer
(including the Letter of Transmittal and the instructions thereto) will be final
and binding. No tender will be deemed to have been validly made until all
defects and irregularities with respect to such tender have been cured or
waived. None of the Purchaser, Devon, the Depositary, the Dealer Manager, the
Information Agent or any other person will be under any duty to give
notification of any defects or irregularities in tenders or incur any liability
for failure to give such notification.
 
     A tender of Units pursuant to any one of the procedures described above
will constitute the tendering Unit holder's acceptance of the terms and
conditions of the Offer. The Purchaser's acceptance for payment of Units
tendered pursuant to the Offer will constitute a binding agreement between the
tendering Unit holder and the Purchaser upon the terms and subject to the
conditions of the Offer.
 
     3. WITHDRAWAL RIGHTS. Except as otherwise provided in this Section 3,
tenders of Units made pursuant to the Offer are irrevocable. Units tendered
pursuant to the Offer may be withdrawn at any time prior to the Expiration Date
and, unless theretofore accepted for payment by the Purchaser as provided
herein, may also be withdrawn at any time after April 13, 1998.
 
                                        5
<PAGE>   8
 
     If, for any reason whatsoever, acceptance for payment of Units tendered
pursuant to the Offer is delayed, or the Purchaser is unable to accept for
payment or pay for Units tendered pursuant to the Offer, then, without prejudice
to the Purchaser's rights set forth herein, the Depositary may, nevertheless, on
behalf of the Purchaser, retain tendered Units, and such Units may not be
withdrawn except to the extent that the tendering Unit holder is entitled to and
duly exercises withdrawal rights as described in this Section 3. Any such delay
will be by an extension of the Offer to the extent required by law.
 
     For a withdrawal to be effective, a written, telegraphic or facsimile
transmission notice of withdrawal must be timely received by the Depositary at
one of its addresses specified on the back cover of this Offer to Purchase. Any
such notice of withdrawal must specify the name of the person who tendered the
Units to be withdrawn, the number of Units to be withdrawn, and (if certificates
for Units have been tendered) the name of the registered holder of the Units as
set forth in the certificate for the Units, if different from the name of the
person who tendered such Units. If certificates for Units to be withdrawn have
been delivered or otherwise identified to the Depositary, then, prior to the
release of such certificates, the serial numbers shown on such certificates must
be submitted to the Depositary and, unless such Units have been tendered by an
Eligible Institution, the signatures on the notice of withdrawal must be
guaranteed by an Eligible Institution. If Units have been tendered pursuant to
the procedure for book-entry transfer as set forth in "THE TENDER OFFER -- 2.
Procedures for Tendering Units," any notice of withdrawal must also specify the
name and number of the account at the Book-Entry Transfer Facility to be
credited with the withdrawn Units and otherwise comply with such Book-Entry
Transfer Facility's procedures.
 
     Withdrawals of tenders of Units may not be rescinded and any Units properly
withdrawn will thereafter be deemed not validly tendered for purposes of the
Offer. However, withdrawn Units may be retendered by again following one of the
procedures described in "THE TENDER OFFER -- 2. Procedures for Tendering Units"
at any time prior to the Expiration Date.
 
     All questions as to the form and validity (including time of receipt) of
notices of withdrawal will be determined by the Purchaser, in its sole
discretion, whose determination will be final and binding. None of the
Purchaser, Devon, the Depositary, the Dealer Manager, the Information Agent or
any other person will be under any duty to give notification of any defects or
irregularities in any notice of withdrawal or incur any liability for failure to
give such notification.
 
     4. ACCEPTANCE FOR PAYMENT AND PAYMENT FOR UNITS. Upon the terms and subject
to the conditions of the Offer (including, if the Offer is extended or amended,
the terms and conditions of any such extension or amendment), the Purchaser will
accept for payment, and will pay for, all Units validly tendered prior to the
Expiration Date (and not properly withdrawn in accordance with "THE TENDER
OFFER -- 3. Withdrawal Rights") promptly after the Expiration Date.
 
     The Purchaser expressly reserves the right, in its sole discretion, to
delay acceptance for payment of, or, subject to the requirements of Rule
14e-1(c) referred to in "THE TENDER OFFER -- 1. Terms of the Offer," payment
for, Units in order to comply in whole or in part with any applicable law or
condition. See "THE TENDER OFFER -- 14. Certain Conditions of the Offer." In all
cases, payment for Units purchased pursuant to the Offer will be made only after
timely receipt by the Depositary of (i) certificates for such Units or timely
confirmation (a "Book-Entry Confirmation") of a book-entry transfer of such
Units into the Depositary's account at a Book-Entry Transfer Facility pursuant
to the procedures set forth in "THE TENDER OFFER -- 2. Procedures for Tendering
Units," (ii) the Letter of Transmittal (or manually signed facsimile thereof),
properly completed and duly executed, with any required signature guarantees, or
an Agent's Message (as defined below) in connection with a book-entry transfer,
and (iii) any other documents required by the Letter of Transmittal.
 
     The term "Agent's Message" means a message, transmitted by a Book-Entry
Transfer Facility to, and received by, the Depositary and forming a part of a
Book-Entry Confirmation, which states that such Book-Entry Transfer Facility has
received an express acknowledgment from the participant in such Book-Entry
Transfer Facility tendering the Units which are the subject of such Book-Entry
Confirmation that such participant has received and agrees to be bound by the
terms of the Letter of Transmittal and that the Purchaser may enforce such
agreement against such participant.
                                        6
<PAGE>   9
 
     For purposes of the Offer, the Purchaser will be deemed to have accepted
for payment (and thereby purchased) Units validly tendered and not properly
withdrawn as, if and when the Purchaser gives oral or written notice to the
Depositary of the Purchaser's acceptance of such Units for payment pursuant to
the Offer. Upon the terms and subject to the conditions of the Offer, payment
for Units accepted for payment pursuant to the Offer will be made by deposit of
the Purchase Price therefor with the Depositary, which will act as agent for
tendering Unit holders for the purpose of receiving payment from the Purchaser
and transmitting payment to tendering Unit holders. Under no circumstances will
interest on the Purchase Price be paid by the Purchaser by reason of any delay
in making such payment.
 
     If any tendered Units are not accepted for payment pursuant to the Offer
for any reason, or if certificates are submitted representing more Units than
are tendered, certificates for tendered Units not purchased or tendered will be
returned, without expense to the tendering Unit holder (or, in the case of Units
tendered by book-entry transfer into the Depositary's account at a Book-Entry
Transfer Facility pursuant to the procedures set forth in "THE TENDER
OFFER -- 2. Procedures for Tendering Units," such Units will be credited to an
account maintained at such Book-Entry Transfer Facility), as promptly as
practicable after the expiration or termination of the Offer.
 
     5. CERTAIN U.S. FEDERAL INCOME TAX CONSIDERATIONS. The following summary of
certain U.S. federal income tax considerations is based upon laws, regulations,
interpretive rulings and judicial decisions in effect on the date hereof, all of
which are subject to change (possibly with retroactive effect). This summary
does not discuss all aspects of U.S. federal income taxation that may be
relevant to a particular taxpayer in light of his or her personal investment
circumstances or to certain types of taxpayers subject to special treatment
under the U.S. federal income tax laws (such as life insurance companies, banks,
tax-exempt organizations, nonresident aliens and foreign corporations). THIS
SUMMARY ALSO DOES NOT DISCUSS ANY ASPECT OF STATE, LOCAL OR FOREIGN TAXATION.
ACCORDINGLY, EACH UNIT HOLDER IS URGED TO CONSULT WITH HIS OR HER TAX ADVISOR AS
TO THE TAX CONSEQUENCES OF TENDERING UNITS PURSUANT TO THE OFFER.
 
     TENDERING UNIT HOLDERS. Each tendering Unit holder will be treated, for
U.S. federal income tax purposes, as having disposed of an undivided interest in
each of the assets of the Trust. As a result, each tendering Unit holder will
recognize gain or loss, for U.S. federal income tax purposes, measured by the
difference between the amount realized on the sale and the Unit holder's tax
basis in the Units sold. A Unit holder's tax basis in his or her Units will
generally include the amount paid by such Unit holder for such Units and an
allocable share of the debts of the Trust, if any, and such tax basis must be
reduced, but not below zero, by any depletion deductions that the Unit holder
has been allowed. A Unit holder's amount realized will generally include an
allocable share of the debts of the Trust, if any, at the time the Units are
sold pursuant to the Offer. The character of the gain or loss as ordinary income
or loss or as capital gain or loss (and, if capital gain or loss, as long-term
or short-term) will be determined by reference to the Royalty Interests (as
defined in "THE TENDER OFFER -- 6. Certain Information Concerning the Trust"),
rather than by reference to the Units (with the result, inter alia, that the
depletion recapture rules will generally require a Unit holder to
recharacterize, as ordinary income, any capital gain realized in connection with
the sale of Units, but not in excess of the depletion deductions previously
allowed to the Unit holder that were applied to reduce tax basis). A tendering
Unit holder who has taken a tax credit under Section 29 of the Internal Revenue
Code of 1986, as amended (the "Code"), will not have to recapture as ordinary
income any amount previously taken as a credit. While net capital gains are
taxed, in the case of corporate taxpayers, at the same rates that apply to
ordinary income, such gains are taxed, in the case of individual taxpayers, at a
maximum rate of (i) 28% if the relevant holding period is more than 12 months
but no more than 18 months and (ii) 20% if the relevant holding period is more
than 18 months. Capital losses may be used, for federal income tax purposes, to
offset only capital gains and may not be used to offset ordinary income (subject
to a $3,000 exemption in the case of individual taxpayers).
 
     The Trust will allocate its income, gain, loss, deduction and credits under
Section 29 of the Code for 1998 between a tendering Unit holder and the
Purchaser based on the number of quarterly record dates established for
distributions by the Trust during the portion of the calendar year that each
such person held the Unit.
 
                                        7
<PAGE>   10
 
     NON-TENDERING UNIT HOLDERS. Consummation of the Offer will not alter the
Trust's classification as a grantor trust and will not require the Trust to
close its taxable year, change its method of accounting or otherwise be
adversely affected.
 
     THE U.S. FEDERAL INCOME TAX DISCUSSION SET FORTH ABOVE IS INCLUDED FOR
GENERAL INFORMATION ONLY. UNIT HOLDERS ARE URGED TO CONSULT THEIR TAX ADVISORS
WITH RESPECT TO THE TAX CONSEQUENCES TO THEM OF THE OFFER, INCLUDING THE EFFECTS
OF FEDERAL, STATE AND LOCAL TAX CONSEQUENCES THEREOF.
 
     6. CERTAIN INFORMATION CONCERNING THE TRUST. According to the Trust's
Annual Report on Form 10-K for the fiscal year ended December 31, 1996 (the
"Trust 10-K"), the Trust was created under the laws of the State of Delaware
pursuant to the Trust Agreement, among Meridian Oil Production Inc., Burlington
Resources Inc., Mellon Bank (DE) National Association and the Trustee dated May
1, 1993 (the "Trust Agreement"). According to the Trust's Quarterly Report on
Form 10-Q for the fiscal quarter ended September 30, 1997 (the "Trust 10-Q"),
the Trust maintains its principal offices at the offices of the Trustee, located
at 901 Main Street, Suite 1700, Dallas, Texas 75202. According to the Trust
10-K, the Trust has been formed to acquire and hold certain net profits
interests (the "Royalty Interests") in Meridian Oil Production Inc.'s interest
in the Fruitland coal formation underlying the Northeast Blanco Unit (the
"Underlying Properties"). The Purchaser believes that the name of Meridian Oil
Production Inc. has been changed to Burlington Resources Oil & Gas Company
("BROG"). Devon's single largest reserve position is its interest in the same
Northeast Blanco Unit ("NEBU"). The interests of all of the owners of interests
in the Northeast Blanco Unit are collectively referred to herein as the "NEBU
Interests."
 
     The Trust is subject to the information and reporting requirements of the
Exchange Act and in accordance therewith files reports and other information
with the Commission relating to its properties, financial condition and other
matters. These reports and other information are available for inspection at the
Commission's public reference facilities at 450 Fifth Street, N.W., Washington,
D.C. 20549, and also should be available for inspection and copying at the
regional offices of the Commission located at Seven World Trade Center, 13th
Floor, New York, New York 10048 and Citicorp Center, 500 West Madison Street,
Suite 1400, Chicago, Illinois 60661. Copies of such material may also be
obtained by mail, upon payment of the Commission's customary fees, from the
Commission's principal office at 450 Fifth Street, N.W., Washington, D.C. 20549.
In addition, the Commission maintains a web site on the Internet that can be
accessed at http://www.sec.gov and that contains information filed
electronically regarding the Trust. Reports and other information concerning the
Trust can also be inspected at the offices of the NYSE, 20 Broad Street, New
York, New York 10005.
 
     The selected financial data set forth below relating to the Trust have been
taken or derived from the audited financial statements contained in the Trust
10-K or the unaudited financial statements contained in the Trust 10-Q. More
comprehensive financial information is included in the Trust 10-K, the Trust
10-Q and the other documents filed by the Trust with the Commission, and the
financial data set forth below are qualified in their entirety by reference to
such reports and other documents including the financial statements and related
notes contained therein.
 
                                        8
<PAGE>   11
 
                              BURLINGTON RESOURCES
                          COAL SEAM GAS ROYALTY TRUST
 
                            SELECTED FINANCIAL DATA
 
          CONDENSED STATEMENTS OF ASSETS, LIABILITIES AND TRUST CORPUS
 
<TABLE>
<CAPTION>
                                                                                DECEMBER 31,
                                                         SEPTEMBER 30,   ---------------------------
                                                             1997            1996           1995
                                                         -------------   ------------   ------------
                                                          (UNAUDITED)
<S>                                                      <C>             <C>            <C>
Assets
Cash and cash equivalents..............................   $    77,522    $    158,251   $     31,260
Net royalty interests in oil and gas properties........    95,634,222     107,371,880    123,603,700
                                                          -----------    ------------   ------------
          Total assets.................................   $95,711,744    $107,530,131   $123,634,960
                                                          ===========    ============   ============
Liabilities and Trust Corpus
Trust expenses payable.................................   $    96,836    $    201,966   $    100,220
Trust corpus (8,800,000 Units authorized and
  outstanding).........................................    95,614,908     107,328,165    123,534,740
                                                          -----------    ------------   ------------
          Total liabilities and trust corpus...........   $95,711,744    $107,530,131   $123,634,960
                                                          ===========    ============   ============
</TABLE>
 
                  CONDENSED STATEMENTS OF DISTRIBUTABLE INCOME
 
<TABLE>
<CAPTION>
                                                 NINE MONTHS ENDED
                                                   SEPTEMBER 30,         YEAR ENDED DECEMBER 31,
                                              -----------------------   -------------------------
                                                 1997         1996         1996          1995
                                              ----------   ----------   -----------   -----------
                                                    (UNAUDITED)
<S>                                           <C>          <C>          <C>           <C>
Royalty income..............................  $5,077,755   $8,376,309   $10,671,428   $14,076,780
Interest income.............................      12,826       22,184        28,339        37,576
                                              ----------   ----------   -----------   -----------
                                              $5,090,581   $8,398,493   $10,699,767   $14,114,356
General and administrative expenses.........    (538,911)    (532,286)     (659,226)     (711,959)
                                              ----------   ----------   -----------   -----------
Distributable income........................  $4,551,670   $7,866,207   $10,040,541   $13,402,397
                                              ==========   ==========   ===========   ===========
Distributable income per Unit (8,800,000
  Units)....................................  $      .52   $      .89   $      1.14   $      1.52
                                              ==========   ==========   ===========   ===========
</TABLE>
 
                CONDENSED STATEMENTS OF CHANGES IN TRUST CORPUS
 
<TABLE>
<CAPTION>
                                         NINE MONTHS ENDED
                                           SEPTEMBER 30,              YEAR ENDED DECEMBER 31,
                                    ----------------------------    ----------------------------
                                        1997            1996            1996            1995
                                    ------------    ------------    ------------    ------------
                                            (UNAUDITED)
<S>                                 <C>             <C>             <C>             <C>
Trust corpus, beginning of
  period..........................  $107,328,165    $123,534,740    $123,534,740    $147,459,837
Amortization and impairment of
  royalty interests...............   (11,737,658)    (15,008,321)    (16,231,820)    (23,913,096)
Distributable income..............     4,551,670       7,866,207      10,040,541      13,402,397
Distributions to Unit holders.....    (4,527,269)     (7,806,576)    (10,015,296)    (13,414,398)
Trust corpus, end of period.......  $ 95,614,908    $108,586,050    $107,328,165    $123,534,740
</TABLE>
 
     The information concerning the Trust contained herein has been taken from
or is based upon reports and other documents on file with the Commission or
otherwise publicly available. None of the Purchaser, Devon, the Dealer Manager,
the Information Agent or the Depositary takes any responsibility for the
accuracy or completeness of the information contained in such reports and other
documents or for any failure by the Trust to disclose events that may have
occurred and may affect the significance or accuracy of any such information but
that are unknown to such persons.
 
                                        9
<PAGE>   12
 
     7. CERTAIN INFORMATION CONCERNING THE PURCHASER AND DEVON. The Purchaser is
a wholly-owned subsidiary of Devon and was recently organized and has not
engaged in any business since its organization other than that incident to its
organization and in connection with the Offer. The principal executive offices
of the Purchaser are located at 20 North Broadway, Suite 1500, Oklahoma City, OK
73102-8260 (telephone 405/235-3611).
 
     Devon is an independent energy company engaged primarily in oil and gas
exploration, development and production, and in the acquisition of producing
properties. Through its predecessors, Devon began operations in 1971. In 1988
Devon's common stock began trading publicly on the American Stock Exchange under
the symbol DVN. The principal executive offices of Devon are located at 20 North
Broadway, Suite 1500, Oklahoma City, OK 73102-8260 (telephone 405/235-3611).
 
     Devon currently owns interests in approximately 2,200 oil and gas
properties concentrated in five operating areas: the Permian Basin in
southeastern New Mexico and western Texas; the San Juan Basin in northwestern
New Mexico; the Rocky Mountain region in Wyoming; the Mid-continent region in
Oklahoma and the Texas Panhandle; and the Western Canada Sedimentary Basin in
Alberta, Canada.
 
                                       10
<PAGE>   13
 
     Set forth below is certain selected consolidated financial information with
respect to Devon and its subsidiaries for the nine month periods ended September
30, 1997 and 1996 and the fiscal years ended December 31, 1996, 1995 and 1994.
Such financial information has been taken from the periodic reports and other
documents filed by Devon with the Commission. More comprehensive information
concerning Devon is included in such reports and other documents and all of the
financial information and notes contained therein.
 
                            DEVON ENERGY CORPORATION
                  SELECTED CONSOLIDATED FINANCIAL INFORMATION
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                            YEAR ENDED DECEMBER 31,
                                                  --------------------------------------------
                                                    1997        1996        1995        1994
                                                  --------    --------    --------    --------
<S>                                               <C>         <C>         <C>         <C>
INCOME STATEMENT DATA:
Total revenues..................................  $313,140    $164,017    $113,303    $100,773
Lease operating expenses........................    65,655      31,568      27,289      24,521
Production taxes................................    17,924      10,658       6,832       6,899
Depreciation, depletion and amortization........    85,307      43,361      38,090      34,132
General and administrative expenses.............    12,922       9,101       8,419       8,425
Interest expense................................       274       5,277       7,051       5,439
Distributions on preferred securities of
  subsidiary trust..............................     9,717       4,753          --          --
Net earnings....................................  $ 75,292    $ 34,801    $ 14,502    $ 13,745
</TABLE>
 
<TABLE>
<CAPTION>
                                                                     AT DECEMBER 31,
                                                             --------------------------------
                                                               1997        1996        1995
                                                             --------    --------    --------
<S>                                                          <C>         <C>         <C>
BALANCE SHEET DATA:
Total assets...............................................  $846,403    $746,251    $421,564
Long-term debt.............................................        --       8,000     143,000
Convertible preferred securities of subsidiary trust.......   149,500     149,500          --
Stockholders' equity.......................................  $543,576    $472,404    $219,041
</TABLE>
 
     Devon is subject to the informational and reporting requirements of the
Exchange Act and is required to file reports and other information with the
Commission relating to its business, financial condition and other matters.
Information as of particular dates concerning Devon's directors and officers,
their remuneration, stock options granted to them, the principal holders of
Devon's securities, any material interests of such persons in transactions with
Devon and other matters is required to be disclosed in proxy statements
distributed to Devon's stockholders and filed with the Commission. These
reports, proxy statements and other information should be available for
inspection and copies may be obtained in the same manner as set forth for the
Trust in "THE TENDER OFFER -- 6. Certain Information Concerning the Trust,"
except that Devon's common stock is traded on the American Stock Exchange, and
reports, proxy statements and other information concerning Devon should also be
on file at the American Stock Exchange, 86 Trinity Place, New York, NY
10006-1881.
 
     The name, citizenship, business address, principal occupation or employment
and five-year employment history for each of the directors and executive
officers of the Purchaser and Devon are set forth in Schedule I hereto.
 
     Except as set forth in this Offer to Purchase (including, without
limitation, Schedule I hereto): (i) none of Purchaser or Devon or, to the
knowledge of Purchaser or Devon, any of the persons listed on Schedule I hereto
or any associate or majority-owned subsidiary of the Purchaser, Devon or any of
the persons so listed, beneficially owns or has any right to acquire any Units;
(ii) none of the Purchaser or Devon or, to the knowledge of Purchaser or Devon,
any of the other persons or entities referred to in clause (i) above or any of
their executive officers, directors or subsidiaries, has effected any
transaction in the Units during the last 60 days; (iii) none of the Purchaser or
Devon or, to the knowledge of the Purchaser or Devon, any of the persons listed
on Schedule I hereto has any contract, arrangement, understanding or
relationship with any
 
                                       11
<PAGE>   14
 
other person with respect to any securities of the Trust, including, but not
limited to any contract, arrangement, understanding or relationship concerning
the transfer or voting thereof, joint ventures, loan or option arrangements,
puts or calls, guarantees of loans, guarantees against loss or the giving or
withholding of proxies; (iv) since January 1, 1995, there have been no
transactions which would require reporting under the rules and regulations of
the Commission between any of the Purchaser or Devon or, to the best knowledge
of the Purchaser or Devon, any of the persons listed on Schedule I hereto, on
the one hand, and the Trust or any of its executive officers, directors or
affiliates, on the other hand; and (v) since January 1, 1995, there have been no
contracts, negotiations or transactions between any of the Purchaser or Devon or
any of their respective subsidiaries or, to the best knowledge of the Purchaser
or Devon, any of the persons listed on Schedule I hereto, on the one hand, and
the Trust or its affiliates, on the other hand, concerning a merger,
consolidation or acquisition, tender offer or other acquisition of securities,
an election of directors or a sale or other transfer of a material amount of
assets of the Trust.
 
     8. PRICE RANGE OF UNITS; CASH DISTRIBUTIONS. The Units are listed and
traded on the NYSE under the symbol BRU. The following table sets forth for the
periods indicated, the reported high and low closing sales prices for the Units
and the cash distributions per Unit, as reported in the Trust 10-K with respect
to the fiscal years 1995 and 1996 and the high and low closing sale prices for
the Units and the cash distributions per Unit reported in published financial
sources for the periods indicated thereafter.
 
<TABLE>
<CAPTION>
                                                       PRICE             CASH
                                                 -----------------   DISTRIBUTIONS
                     1995                         HIGH       LOW       PER UNIT
                     ----                        -------   -------   -------------
<S>                                              <C>       <C>       <C>
First Quarter..................................  $17.375   $15.250     $0.364168
Second Quarter.................................   17.000    14.750      0.399989
Third Quarter..................................   15.500    14.500      0.385197
Fourth Quarter.................................   15.375    12.375      0.375008
</TABLE>
 
<TABLE>
<CAPTION>
                                                       PRICE             CASH
                                                 -----------------   DISTRIBUTIONS
                     1996                         HIGH       LOW       PER UNIT
                     ----                        -------   -------   -------------
<S>                                              <C>       <C>       <C>
First Quarter..................................  $13.625   $10.125     $0.332900
Second Quarter.................................   11.750     8.750      0.298843
Third Quarter..................................   10.000     8.750      0.255385
Fourth Quarter.................................   10.000     8.250      0.250990
</TABLE>
 
<TABLE>
<CAPTION>
                                                       PRICE             CASH
                                                 -----------------   DISTRIBUTIONS
                     1997                         HIGH       LOW       PER UNIT
                     ----                        -------   -------   -------------
<S>                                              <C>       <C>       <C>
First Quarter..................................  $ 9.750   $ 7.625     $0.147801
Second Quarter.................................    8.250     6.750      0.160766
Third Quarter..................................    8.000     7.125      0.205895
Fourth Quarter.................................    7.9375    5.375      0.125486
</TABLE>
 
<TABLE>
<CAPTION>
                                                       PRICE             CASH
                                                 -----------------   DISTRIBUTIONS
                     1998                         HIGH       LOW       PER UNIT
                     ----                        -------   -------   -------------
<S>                                              <C>       <C>       <C>
First Quarter (through February 12, 1998)......  $8.9375   $5.9375        *
</TABLE>
 
- ---------------
 
* This information had not been publicly announced as of February 12, 1998.
 
     On February 10, 1998, the last full trading day prior to the public
announcement of the Purchaser's intention to commence the Offer, the closing
sales price for the Units on the NYSE was $8.125 per Unit. On February 12, 1998,
the last full trading day prior to the commencement of the Offer, the closing
sales price for the Units on the NYSE was $8.875 per Unit. UNIT HOLDERS ARE
URGED TO OBTAIN A CURRENT MARKET QUOTATION FOR THE UNITS.
 
                                       12
<PAGE>   15
 
     Cash distributions are made by the Trustee on a quarterly basis. According
to the Trust 10-K, the quarterly distribution is payable to Unit holders of
record on the 63rd day following the end of such calendar quarter unless such
day is not a business day in which case the record date will be the next
business day thereafter. The Trustee distributes the quarterly distribution on
or prior to 75 days after the end of each calendar quarter to each person who
was a Unit holder of record on the associated record date, together with
interest estimated to be earned on such amount from the date of receipt thereof
by the Trustee to the payment date. The Purchaser believes that the amount of
each quarterly distribution is generally announced before the quarterly record
date.
 
     9. DISTRIBUTIONS. If, on or after the date of this Offer to Purchase, the
Trust should split, combine or otherwise change the Units or its capitalization,
or disclose that it has taken such action, then, without prejudice to the
Purchaser's rights under applicable law and subject to the provisions in "THE
TENDER OFFER -- 14. Certain Conditions of the Offer," the Purchaser, in its sole
discretion, may make such adjustments in the Purchase Price and other terms of
the Offer as it deems appropriate to reflect such split, combination or other
change including, without limitation, the number of Units to be purchased.
 
     If, on or after the date of this Offer to Purchase, the Trust should
declare or pay any distribution with respect to the Units, other than the
regular quarterly cash distributions and associated tax credits (see "THE TENDER
OFFER -- 8. Price Range of Units; Cash Distributions"), that is payable or
distributable to record holders as of a date prior to the transfer to the
Purchaser on the Trust's transfer records of the Units purchased pursuant to the
Offer, then without prejudice to the Purchaser's rights under applicable law and
subject to the provisions in "THE TENDER OFFER -- 14. Certain Conditions of the
Offer," (i) in the case of any cash distribution, the Purchase Price will be
reduced by the amount of such cash distribution and (ii) in the case of any
non-cash distribution, such non-cash distribution shall be received and held by
the tendering Unit holders for the account of the Purchaser and will be required
to be promptly remitted and transferred by each tendering Unit holder to the
Depositary for the account of the Purchaser, accompanied by appropriate
documentation of transfer. Pending such remittance and subject to applicable
law, the Purchaser will be entitled to all rights and privileges as owner of any
such non-cash distribution and may withhold the entire Purchase Price or deduct
from the Purchase Price the amount or value thereof, as determined by the
Purchaser in its sole discretion.
 
     10. FINANCING OF THE OFFER. The total amount of funds required by the
Purchaser to purchase all outstanding Units pursuant to the Offer and to pay
related fees and expenses is expected to be approximately $78 million. The
Purchaser expects to obtain all such necessary funds from loans and/or capital
contributions from Devon. Devon expects to obtain such funds from cash on hand
and/or from borrowings under Devon's existing committed credit lines. As of
December 31, 1997, Devon had cash balances of approximately $42 million and $208
million available on its U. S. lines of credit.
 
     Devon has long-term lines of credit with participating banks, including
NationsBank of Texas, N.A. (agent), Bank One, Texas, N.A., Bank of Montreal,
First Union National Bank of North Carolina and Bank of Oklahoma, N.A. Devon can
borrow up to an amount determined by the banks based on their evaluation of the
assets and cash flow (the "Borrowing Base") of Devon. The established Borrowing
Base at December 31, 1997, was $208 million. Amounts borrowed under the credit
lines bear interest at various fixed rate options which Devon may elect for
periods up to 90 days. Such rates are generally less than the prime rate. Devon
may also elect to borrow at the prime rate. No amounts were borrowed under the
credit lines at the end of 1997.
 
     Debt under the credit lines is unsecured. No principal payments are
required until maturity unless the unpaid balance exceeds the maximum loan
amount. The maximum loan amount is equal to the Borrowing Base until August 31,
2000. Thereafter, the maximum loan amount will be reduced by 8.33% every three
months until August 31, 2003. The loan agreements contain certain covenants and
restrictions, among which are limitations on additional borrowings and annual
sales of properties valued at more than $25 million, and working capital and net
worth maintenance requirements. At December 31, 1997, Devon was in compliance
with such covenants and restrictions.
 
     Devon anticipates that its operating cash flow will be sufficient to repay
any borrowings incurred as a result of the Offer.
                                       13
<PAGE>   16
 
     11. BACKGROUND OF THE OFFER; PAST CONTACTS, TRANSACTIONS OR NEGOTIATIONS
WITH THE TRUST. Since 1988, Devon has been the "Operator" of the NEBU Interests.
See "THE TENDER OFFER -- 16. Certain Transactions." On February 11, 1998, Devon
issued a press release announcing the intention to commence the Offer. On
February 12, 1998, representatives of the Purchaser requested the Trustee to
provide, and the Trustee indicated that it would provide, the Purchaser with the
Trust's Unit holder list and security position listings. On February 13, 1998,
the Purchaser commenced the Offer.
 
     12. PURPOSE AND STRUCTURE OF THE OFFER; PLANS FOR THE TRUST. The purpose of
the Offer is for the Purchaser to acquire a significant number of Units as an
investment.
 
     The Purchaser has no current plan or intention of seeking to terminate the
Trust. However, if the Purchaser acquired 66 2/3% of the outstanding Units
(pursuant to the Offer or otherwise), the Purchaser would have the power to
cause the termination of the Trust without the affirmative vote of any other
Unit holders. Conversely, if the Purchaser obtains more than 33 1/3% of the
outstanding Units, it would have the voting power necessary to defeat any
proposal to terminate the Trust (since termination of the Trust requires the
affirmative vote of at least 66 2/3% of the outstanding Units).
 
     Although the Purchaser has no current plans to cause the termination of the
Trust, there can be no assurance that the Purchaser will not consider proposing
and/or voting for termination of the Trust at some time in the future. In the
event that the Trust is terminated, the Purchaser or its affiliates may submit
an offer to purchase the Trust's interests in the Underlying Properties in
connection with the Trustee's auction of the Trust assets or otherwise.
 
     The information in the following paragraphs of this Section 12 has been
taken or derived from the Trust Agreement, which has been filed as an exhibit to
the Trust 10-K. More comprehensive information concerning meetings of Unit
holders and the termination of the Trust is included in the Trust Agreement, and
the information set forth below is qualified in its entirety by reference to the
Trust Agreement.
 
     According to the terms of the Trust Agreement, the Trust may terminate
prior to January 1, 2003 only upon the affirmative vote in favor of termination
of the Trust by the holders of at least 66 2/3% of the outstanding Units. A
meeting of the Unit holders may be called by Unit holders owning of record not
less than 10% of the then outstanding Units. The notice of such meeting must be
distributed at least 20, but not more than 60, days prior to the date of the
meeting. At such meeting, if the holders of at least 66 2/3% of the Units vote
to terminate the Trust, the Trustee will commence the liquidation process. The
Trust will still continue until all of the affairs of the Trust are liquidated
and wound up.
 
     Within five business days of the date the Unit holders vote to terminate
the Trust (the "Termination Date"), the Trustee must (i) provide BROG,
Burlington Resources Inc. and Mellon Bank (DE) National Association (the
"Delaware Trustee") or its successor with written notice of the termination of
the Trust and (ii) engage an investment banking firm (the "Advisor") to assist
the Trustee in selling the remaining Royalty Interests then owned by the Trust
(the "Remaining Royalty Interests").
 
     BROG may, but is not obligated to, make a written cash offer to purchase
the Remaining Royalty Interests, which offer must be delivered to the Trustee
within 60 days following the Termination Date (the "Option Period Termination
Date"). If BROG does make an offer to purchase the Remaining Royalty Interests,
the Trustee must decide, based on the recommendation of the Advisor, whether to
accept the offer. The Trustee must provide written notice to BROG of the
decision by the later of (i) the Option Period Termination Date or (ii) the
tenth business day after the date the Trustee receives BROG's offer. The
Trustee's notice must state that the Trustee (i) accepts the offer (which
acceptance is conditional on the receipt of an opinion of the Advisor of the
fairness of BROG's offer to the Unit holders from a financial point of view) or
(ii) defers action on the offer. If the Trustee accepts BROG's offer, BROG and
the Trustee must use their best efforts to close the purchase within 30 days of
BROG's receipt of notice of acceptance.
 
                                       14
<PAGE>   17
 
     If the Trustee defers action on BROG's offer, the Trustee must use its best
efforts, with the Advisor's assistance, to obtain other cash offers for the
Remaining Royalty Interests. The Trustee must notify BROG of the highest offer,
if any, received by the Trust within 120 days following the Termination Date. If
the highest offer is more than 105% of BROG's original offer, or if BROG did not
make an offer, BROG may, but is not obligated to, purchase all of the Remaining
Royalty Interests for a cash purchase price equal to 105% of the highest offer.
If the highest offer is equal to or less than 105% of BROG's original offer,
BROG may, but is not obligated to, purchase all of the Remaining Royalty
Interests for a cash purchase price equal to the highest offer. BROG must
provide written notice of its election to purchase the Remaining Royalty
Interests within five business days of BROG's receipt of notice of the highest
offer. BROG and the Trustee must use their best efforts to close the purchase
within 30 days of BROG's receipt of notice of the highest offer.
 
     If no other acceptable cash offers are received for the Remaining Royalty
Interests, the Trustee may request that BROG submit another offer. If BROG makes
an offer, and the Trustee accepts it, the acceptance will be conditional upon
receipt of an opinion of the Advisor of the fairness of the offer to the Unit
holders. BROG and the Trustee must use their best efforts to close the purchase
within 30 days of BROG's receipt of notice of acceptance of the offer.
 
     If any assets or property of the Trust estate have not been sold, or no
definitive agreement for their sale has been entered into, within one year after
the Termination Date, the Trustee will cause the property to be sold at public
auction to the highest bidder (which may be BROG or any of its affiliates).
Notice of such auction must be mailed to each Unit holder at least 30 days prior
to the sale.
 
     The Purchaser and its affiliates also reserve the right, following
termination of the Offer, to purchase additional Units, either in open market or
privately negotiated transactions, in one or more additional tender offers or
otherwise, or to sell all or any portion of the Units owned by them. Any such
sales or purchases would depend upon current market prices for the Units,
prevailing industry and general economic and market conditions, the business,
financial condition and results of operations of the Trust and other relevant
factors, and would be on such terms and at such prices as the Purchaser or its
affiliates may then determine.
 
     The Trust Agreement provides that, under certain circumstances, the Trustee
and the Delaware Trustee may be removed by a majority vote of the Unit holders.
The Purchaser has no present plans to vote its Units for the removal of either
the Trustee or the Delaware Trustee.
 
     Currently, the Purchaser has no intention to seek to materially change the
distributions of the Trust.
 
     13. EFFECT OF THE OFFER ON THE MARKET FOR UNITS; NYSE LISTING AND EXCHANGE
ACT REGISTRATION; MARGIN REGULATIONS. The purchase of Units pursuant to the
Offer will reduce the number of Units that might otherwise trade publicly and
the number of holders of Units and could adversely affect the liquidity and
market value of the remaining Units held by the public. The purchase of Units
pursuant to the Offer can also be expected to reduce the number of holders of
Units.
 
     STOCK EXCHANGE LISTING. According to the NYSE's published guidelines, the
NYSE would consider delisting the Units if, among other things, the number of
record holders of at least 100 Units should fall below 1,200 (the number of
beneficial holders of Units held in nominee form through an NYSE member being
considered for such purpose), the number of publicly held Units (exclusive of
holdings of officers, directors, their immediate families and other concentrated
holdings of 10% or more ("NYSE Excluded Holdings")) should fall below 600,000,
or the aggregate market value of such Units should fall below $5,000,000.
 
     Depending on the number of Units purchased pursuant to the Offer, the Units
may no longer meet the requirements of the NYSE for continued listing and may,
therefore, be delisted from such exchange. If, as a result of the purchase of
Units pursuant to the Offer or otherwise, the Units no longer meet the
requirements of the NYSE for continued listing and/or trading and such trading
of the Units were discontinued, the market for such Units could be adversely
affected.
 
     In the event of the delisting of the Units by the NYSE (which the Purchaser
intends to cause the Trust to seek following the Offer if the continued listing
criteria of the NYSE are no longer satisfied), it is possible that the Units
would continue to trade on another securities exchange or in the
over-the-counter market and
 
                                       15
<PAGE>   18
 
that price quotations would be reported by such exchange, by the National
Association of Securities Dealers, Inc. (the "NASD") through the NASD Automated
Quotation System ("Nasdaq") or by other sources. The extent of the public market
for Units and the availability of such quotations would, however, depend upon
such factors as the number of Unit holders remaining at such time, the interest
in maintaining a market in such Units on the part of securities firms, the
possible termination of registration under the Exchange Act as described below
and other factors.
 
     EXCHANGE ACT REGISTRATION. The Units are currently registered under the
Exchange Act. The purchase of the Units pursuant to the Offer may result in the
Units becoming eligible for deregistration under the Exchange Act. Registration
of the Units under the Exchange Act may be terminated upon application of the
Trust to the Commission if the Units are not listed on a national securities
exchange and there are fewer than 300 record holders of the Units. Termination
of registration of the Units under the Exchange Act would substantially reduce
the information required to be furnished by the Trust to Unit holders and to the
Commission and would make certain provisions of the Exchange Act, such as the
short-swing profit recovery provisions of Section 16(b) of the Exchange Act and
the requirements of furnishing a proxy statement in connection with Unit
holders' meeting pursuant to Section 14(a) of the Exchange Act, no longer
applicable to the Trust. If the Units are no longer registered under the
Exchange Act, the requirements of Rule 13e-3 under the Exchange Act with respect
to "going private" transactions would no longer be applicable to the Trust.
Furthermore, the ability of "affiliates" of the Trust and persons holding
"restricted securities" of the Trust to dispose of such securities pursuant to
Rule 144 promulgated under the Securities Act of 1933, as amended, may be
impaired or eliminated. In addition, if registration of the Units under the
Exchange Act were terminated, the Units would no longer be eligible for listing
or Nasdaq reporting.
 
     It is the present intention of the Purchaser to seek to cause the Trust to
make such an application for termination of registration of the Units as soon as
possible following the Offer if the requirements for termination of registration
are met.
 
     MARGIN REGULATIONS. The Units are presently "margin securities" under the
regulations of the Board of Governors of the Federal Reserve System (the
"Federal Reserve Board"), which has the effect, among other things, of allowing
brokers to extend credit on the collateral of such Units for the purpose of
buying, carrying or trading in securities ("Purpose Loans"). Depending upon
factors such as the number of record holders of the Units and the number and
market value of publicly held Units, following the purchase of Units pursuant to
the Offer, the Units may no longer constitute margin securities for purposes of
the Federal Reserve Board's margin regulations and, therefore, could no longer
be used as collateral for Purpose Loans made by brokers. In addition, if
registration of the Units under the Exchange Act were terminated, the Units
would no longer constitute margin securities.
 
     14. CERTAIN CONDITIONS OF THE OFFER. Notwithstanding any other provisions
of the Offer and in addition to (and not in limitation of) the Purchaser's
rights to extend and amend the Offer at any time in its sole discretion, the
Purchaser shall not be required to accept for payment or, subject to the
applicable rules and regulations of the Commission, pay for, and may delay the
acceptance for payment of or, subject to the applicable rules and regulations of
the Commission, payment for, Units tendered pursuant to the Offer, and may
terminate the Offer and not accept for payment any Units, if at any time after
February 6, 1998 and before the acceptance for payment of Units pursuant to the
Offer, any of the following events shall occur or be deemed by the Purchaser to
have occurred:
 
          (a) there shall be threatened, instituted or pending any action or
     proceeding by or before any court or governmental, administrative or
     regulatory agency or authority or any other person, domestic or foreign,
     challenging the making of the Offer or the acquisition by the Purchaser of
     any Units, or otherwise directly or indirectly relating to the Offer or, in
     the sole judgment of the Purchaser, otherwise adversely affecting the
     Trust, the Purchaser, Devon or any of their respective subsidiaries or
     affiliates; or
 
          (b) any change shall have occurred or be threatened in the properties,
     financial condition, operations, results of operations or prospects of the
     Trust or the Royalty Interests that, in the sole judgment of the Purchaser,
     is or may be materially adverse to the Trust or the Royalty Interests, or
     the Purchaser shall have become aware of any facts that, in the sole
     judgment of the Purchaser, have or may
                                       16
<PAGE>   19
 
     have material adverse significance with respect to the value of the Trust
     or the Royalty Interests or the value of the Units to the Purchaser; or
 
          (c) there shall have been any action taken, or any statute, rule,
     regulation or order proposed, promulgated, enacted, entered or deemed
     applicable to the Offer, by any domestic or foreign government or
     governmental authority or by any court, domestic or foreign, that, in the
     sole judgment of the Purchaser, might (i) make the acceptance for payment
     of or payment for some or all of the Units illegal or otherwise restrict or
     prohibit consummation of the Offer, or impose material obligations upon the
     Purchaser as a result of any such acceptance or payment, (ii) result in a
     delay in the ability of the Purchaser, or render the Purchaser unable, to
     accept for payment or pay for some or all of the Units, (iii) require the
     Purchaser or the Trust or any of their respective affiliates to hold
     separate or to divest itself of all or any portion of the business, assets
     or property of any of them or any Units or impose any limitation on the
     ability of any of them to conduct their business and own such assets,
     properties and Units, (iv) impose material limitations on the ability of
     the Purchaser or Devon to acquire, hold or exercise effectively all rights
     of ownership of the Units, including the right to vote any Units purchased
     by it on all matters properly presented to the Unit holders or (v)
     otherwise adversely affect the Purchaser, Devon, the Trust or the Units; or
 
          (d) there shall have occurred (i) any general suspension of trading,
     or limitation on prices for, securities on any national securities exchange
     or in the over-the-counter market in the United States, (ii) a declaration
     of a banking moratorium or any suspension of payments in respect of banks
     in the United States, (iii) the commencement of war, armed hostilities or
     other international or national calamity directly or indirectly involving
     the United States, (iv) any limitation (whether or not mandatory) by any
     United States governmental authority or agency on the extension of credit
     by banks or other financial institutions in the United States, (v) from the
     date of this Offer to Purchase through the date of expiration or
     termination of the Offer, a decline of at least 20% in either the Dow Jones
     Average of Industrial Stocks or the Standard & Poor's 500 Index, which
     decline shall have remained in effect for at least five NYSE trading days
     or (vi) in the case of any of the situations described in the clauses (i)
     through (iv) inclusive, existing at the date of the commencement of the
     Offer, a material acceleration or worsening thereof;
 
which, in the sole judgment of the Purchaser, in any such case, and regardless
of the circumstances (including any action or inaction by the Purchaser or any
of its affiliates) giving rise to any such condition, makes it inadvisable to
proceed with the Offer or with acceptance for payment or payment for Units.
 
     The foregoing conditions are for the sole benefit of the Purchaser and its
affiliates and may be asserted by the Purchaser, in whole or in part, at any
time and from time to time in the sole judgment of the Purchaser. The failure by
the Purchaser at any time to exercise its rights under any of the foregoing
conditions shall not be deemed a waiver of any such rights and each such right
shall be deemed an ongoing right which may be asserted at any time or from time
to time. Any determination by the Purchaser concerning the events described in
this Section shall be final and binding on all parties.
 
     15. APPRAISAL RIGHTS. Holders of Units do not have appraisal rights in
connection with the Offer.
 
     16. CERTAIN TRANSACTIONS. Devon's single largest reserve position is its
interest in NEBU, the same property of which the Underlying Properties are a
part. In addition, Devon is the "Operator" of the NEBU Interests on behalf of
all of the working interest owners. Among other things, Devon's duties as
Operator include (i) providing personnel, supplies and equipment necessary to
conduct day-to-day production and drilling activities, well workovers,
maintenance and repairs on the wells and facilities of the NEBU Interests; (ii)
maintaining production and other records regarding the status and history of the
NEBU Interests; (iii) applying for necessary governmental permits and complying
with applicable regulatory requirements; (iv) paying expenses associated with
operating the NEBU Interests and billing the other working interest owners for
their proportion of such costs; and (v) various other activities necessary for
the operation of the NEBU Interests. In consideration for its duties as
Operator, Devon receives payments from the other working interest owners to
reimburse Devon for such owners' proportionate share of direct expenses
 
                                       17
<PAGE>   20
 
and to reimburse Devon for its overhead expense incurred in its capacity as
Operator. The amount of overhead reimbursement Devon receives is set forth in
the operating agreement covering the NEBU Interests, and reflects rates that are
standard and customary in the oil and gas industry in the San Juan Basin.
 
     The potential for gas production from coal seams varies depending upon the
thickness of the coal formation, the type of coal in place, the depth at which
it is found and other factors. The NEBU Interests are located in the central
part of the San Juan Basin where, Devon believes, each of the factors is at or
near its optimum. Devon's independent petroleum engineers, LaRoche Petroleum
Consultants, Inc. ("LaRoche") estimate that as of December 31, 1997 there were
761 billion cubic feet ("Bcf") of proved reserves associated with the NEBU
Interests. This estimate includes approximately 181 Bcf of natural gas reserves
which are classified as "proved undeveloped" (defined below).
 
     Based upon information available to Devon in the Trust's publicly available
documents and LaRoche's reserve data, and based upon Devon's belief as to the
Trust's methodology with respect to netting of capital expenditures and other
costs, Devon has calculated that the Trust's share of the total proved reserves
of the NEBU Interests was approximately 68.0 Bcf of natural gas as of December
31, 1997. This includes approximately 3.7 Bcf of proved undeveloped reserves.
 
     To the best of Devon's knowledge as of February 12, 1998, the Trust had not
publicly reported an estimate of the Trust's total proved reserves as of
December 31, 1997. To the best of Devon's knowledge as of February 12, 1998, the
most recent estimate of reserves reported by the Trust was 71.6 Bcf reported in
the Trust 10-K. It should be noted that proved reserves reported by the Trust
are determined by independent engineers engaged by the Trust. Such estimates may
differ from the reserves reported by LaRoche.
 
     It should be noted that proved reserves are those quantities of natural gas
which geological and engineering data demonstrate with reasonable certainty to
be recoverable in the future from known reservoirs under existing economic and
operating conditions. Estimates of proved reserves are strictly technical
judgments, and are not knowingly influenced by attitudes of conservatism or
optimism. The process of estimating proved reserves is complex, requiring
significant subjective decisions in the evaluation of available geological,
engineering and economic data for each reservoir. The data for a given reservoir
may change substantially over time as a result of, among other things,
additional development activity, production history and viability of production
under varying economic conditions. Consequently, material revisions to existing
reserve estimates may occur in the future. Proved undeveloped reserves are
proved reserves to be recovered from new wells to be drilled in the future and
for which a relatively major expenditure is required. Because no drilling data
and/or production history is available, the estimation of proved undeveloped
reserves is inherently even more subjective and less precise than the estimation
of proved developed reserves. No assurance can be given that the wells required
to be drilled to recover proved undeveloped reserves will actually be drilled.
 
     The working interest owners of the NEBU Interests have agreed to implement
a number of projects which may improve and/or accelerate production and may
increase the percentage of estimated gas in place that can be economically
recovered from the NEBU Interests. The first of these projects, called "line
looping", involves laying additional gathering lines to decrease operating
pressures. This project was begun in 1996 and was substantially completed by
October 1997. Another project involves the installation of additional
compressors at various points in the gathering system and at central delivery
points associated with the NEBU Interests. This project was begun in 1997 and
will continue in 1998. Additional projects to improve production through work on
individual wells are currently underway. Longer term, Devon believes that
additional wells may be drilled which could improve production.
 
     Initial results from the portion of the line looping and compression
projects that has been completed through February 12, 1998 appear favorable.
Total daily production from the NEBU Interests has increased from an average of
187 million cubic feet ("MMcf") of gas per day in June 1996 to an average of 209
MMcf of gas per day in January 1998. Devon anticipates that the installation of
additional compression and facilities could increase production from the NEBU
Interests another 10 MMcf to 20 MMcf of gas per day. However, the timing,
sustainability, amounts of such increase (if any) and the effects (if any) on
distributions to Unit holders cannot be projected with certainty.
 
                                       18
<PAGE>   21
 
     In its capacity as Operator, Devon bills BROG or its affiliates
(collectively, "Burlington") for capital expenditures, lease operating expenses
and overhead reimbursement on the NEBU Interests. In addition, Devon collects
revenue from the purchaser of Burlington's share of gas production from the NEBU
Interests and then distributes that revenue to Burlington. The following table
shows the total amount of such costs and revenues for the three years ended
December 31, 1997. The table also shows, based on information available to Devon
from the Trust's publicly available documents, Devon's calculation of the
approximate amount by which the Trust's cash distributions were reduced or will
be reduced by these various expenses billed by Devon to Burlington.
 
<TABLE>
<CAPTION>
                                                                YEARS ENDED DECEMBER 31,
                                                        ----------------------------------------
                                                           1997           1996           1995
                                                        -----------    -----------    ----------
<S>                                                     <C>            <C>            <C>
Amounts billed to Burlington by Devon for:
  Capital expenditures................................  $ 1,923,126    $ 1,719,098    $  254,435
  Lease operating expenses............................      789,771        386,697       365,439
  Overhead reimbursement..............................      103,039         99,028        94,938
Corresponding reduction of the Trust's cash
  distributions(1) for:
  Capital expenditures................................  $ 1,826,970    $ 1,633,143    $  241,713
  Lease operating expenses............................      750,282        367,362       347,167
  Overhead reimbursement..............................       97,887         94,077        90,191
Revenues, net of royalties and production taxes, for
  Burlington's share of gas production collected by
  Devon, distributed to Burlington....................  $15,519,015(2) $12,395,077    $9,056,194
</TABLE>
 
- ---------------
 
(1) Calculated by Devon based on Devon's belief as to the Trust's methodology
    with respect to the Trust's share of Burlington's expenses.
 
(2) The 1997 amount includes only 11 months of distributions since the December
    1997 revenues had not been disbursed as of February 12, 1998.
 
     Devon currently estimates that Burlington's share of capital costs to be
incurred in 1998 will be approximately $1.3 million. Devon has calculated that
the Trust's cash distributions will be reduced by approximately $1.2 million of
this total. Capital costs such as these have reduced and will temporarily
continue to reduce the Trust's cash distributions until the capital projects are
completed.
 
     Devon has a contract with Burlington to gather Devon's portion of
production from the individual NEBU wells and deliver the gas to central
delivery points. This contract is unrelated to the Trust. During the years ended
December 31, 1995, 1996 and 1997, Devon paid Burlington $5,132,000, $4,314,000
and $3,924,000, respectively, for Burlington's services in connection with this
gathering contract.
 
                                       19
<PAGE>   22
 
     17. CERTAIN LEGAL MATTERS.
 
     GENERAL. Except as set forth in this Offer to Purchase, including but not
limited to this Section 17, based upon an examination of publicly available
information filed by the Trust with the Commission and other publicly available
information with respect to the Trust, the Purchaser is not aware of any license
or any other regulatory permit that appears to be material to the business of
the Trust, that might be adversely affected by the Purchaser's acquisition of
the Units as contemplated herein or, except as disclosed below, of any filing,
approval or other action by or with any state, federal or foreign governmental,
administrative or regulatory agency that would be required prior to the
acquisition of Units pursuant to the Offer as contemplated herein. Should any
such approval or other action be required, the Purchaser currently contemplates
that such approval or other action will be sought. While the Purchaser does not
currently intend to delay the acceptance for payment of Units tendered pursuant
to the Offer pending the outcome of any such matter, there can be no assurance
that any such approval or other action, if needed, would be obtained or would be
obtained without substantial conditions or that failure to obtain any such
approval or other action might not result in consequences adverse to the
properties and assets of the Trust or that certain of the Trust's properties and
assets might not have to be disposed of in the event that such approvals were
not obtained or such other actions were not taken in order to obtain any such
approval or other action. If certain types of adverse action are taken with
respect to the matters discussed below, the Purchaser could decline to accept
for payment or pay for any Units tendered. See "THE TENDER OFFER -- 14. Certain
Conditions of the Offer" for certain conditions to the Offer, including
conditions with respect to litigation and governmental action.
 
     STATE TAKEOVER STATUTES. Based upon its knowledge of the assets of the
Trust and upon publicly available information with respect to the Trust, the
Purchaser does not believe that any state takeover statutes or regulations are
applicable to the Offer. In the event that it is asserted that one or more state
takeover statutes or regulations is applicable to the Offer, and an appropriate
court does not determine that it is inapplicable or invalid as applied to the
Offer, the Purchaser might be required to file certain information with, or
receive approvals from, the relevant state authorities, and the Purchaser might
be unable to purchase or pay for Units tendered pursuant to the Offer or might
be delayed in continuing or consummating the Offer. In such case, the Purchaser
may not be obligated to accept Units for payment. See "THE TENDER OFFER -- 14.
Certain Conditions of the Offer."
 
     ANTITRUST. Under the Hart-Scott-Rodino Antitrust Improvements Act of 1976,
as amended (the "HSR Act"), certain acquisition transactions may not be
consummated unless certain information has been furnished to the Antitrust
Division of the Department of Justice (the "Antitrust Division") and the Federal
Trade Commission (the "FTC") and certain waiting period requirements have been
satisfied. The Purchaser believes that the acquisition of Units pursuant to the
Offer is not subject to the HSR Act or such requirements. However, if the HSR
Act is applicable to the purchase of Units pursuant to the Offer, the Purchaser
intends to take all action necessary to comply with the HSR Act, which could
result in a delay in the consummation of the Offer.
 
     The Antitrust Division and the FTC frequently scrutinize the legality under
the antitrust laws of transactions such as the acquisition of Units by the
Purchaser pursuant to the Offer. At any time before or after the consummation of
the transaction, the Antitrust Division or the FTC could take such action under
the antitrust laws as it deems necessary or desirable in the public interest,
including seeking to enjoin the transaction or seeking divestiture of the Units
so acquired or divestiture of substantial assets of the Purchaser or the Trust.
 
     The Purchaser believes that the acquisition of the Units pursuant to the
Offer would not violate the antitrust laws. However, there can be no assurance
that a challenge to the Offer on antitrust grounds will not be made, or if such
a challenge is made, what the result will be. See "THE TENDER OFFER -- 14.
Certain Conditions of the Offer" for certain conditions to the Offer, including
conditions with respect to litigation and certain governmental actions.
 
     18. FEES AND OTHER EXPENSES. Salomon Smith Barney is acting as Dealer
Manager for the Offer and as financial advisor to Devon in connection with its
acquisition of Units. Pursuant to the terms of Salomon Smith Barney's
engagement, Devon has agreed to pay Salomon Smith Barney for its services (i) a
                                       20
<PAGE>   23
 
retainer fee of $100,000, payable upon execution of the engagement letter
between Salomon Smith Barney and Devon, (ii) a dealer manager fee of $100,000,
payable upon commencement of the Offer and (iii) a transaction fee equal to $.06
multiplied by the number of Units tendered in the Offer, payable upon
consummation of the Offer. Devon also has agreed to reimburse Salomon Smith
Barney for travel and other out-of-pocket expenses, including legal fees and
expenses, and to indemnify Salomon Smith Barney and certain related parties
against certain liabilities, including liabilities under the federal securities
laws, arising out of Salomon Smith Barney's engagement. In the ordinary course
of business, Salomon Smith Barney and its affiliates may actively trade or hold
the securities of Devon and the Trust for their own account or for the account
of customers and, accordingly, may at any time hold a long or short position in
such securities.
 
     The Purchaser also has retained D.F. King & Co., Inc. to act as the
Information Agent and Harris Trust Company of New York to act as the Depositary
in connection with the Offer. The Information Agent may contact holders of Units
by mail, telephone, telex, telecopy, telegraph and personal interview and may
request banks, brokers, dealers and other nominee Unit holders to forward
materials relating to the Offer to beneficial holders. Each of the Information
Agent and the Depositary will receive reasonable and customary compensation for
its services, will be reimbursed for certain reasonable out-of-pocket expenses
and will be indemnified against certain liabilities and expenses in connection
therewith.
 
     Brokers, dealers, commercial banks and trust companies will, upon request
only, be reimbursed by the Purchaser for customary mailing and handling expenses
incurred by them in forwarding material to their customers. Except as set forth
above, the Purchaser will not pay any fees or commissions to any broker, dealer
or other person (other than to the Dealer Manager and to the Information Agent)
for soliciting tenders of Units pursuant to the Offer.
 
     19. MISCELLANEOUS. The Offer is not being made to (nor will tenders be
accepted from or on behalf of) holders of Units residing in any jurisdiction in
which the making of the Offer or the acceptance thereof would not be in
compliance with the securities, blue sky or other laws of such jurisdiction. The
Purchaser is not aware of any jurisdiction in which the making of the Offer or
the acceptance thereof would not be in compliance with the laws of such
jurisdiction. To the extent the Purchaser becomes aware of any state law that
would limit the class of offerees in the Offer, the Purchaser may, in its
discretion, take such action as it may deem necessary to make the Offer in any
jurisdiction and extend the Offer to holders of Units in such jurisdiction.
 
     In any jurisdiction where the securities, blue sky or other laws require
the Offer to be made by a licensed broker or dealer, the Offer will be deemed to
be made on behalf of the Purchaser by the Dealer Manager or one or more
registered brokers or dealers that are licensed under the laws of such
jurisdiction.
 
     The Purchaser and Devon have filed with the Commission a Tender Offer
Statement on the Purchaser Schedule 14D-1, together with exhibits thereto,
furnishing certain additional information with respect to the Offer, and may
file amendments thereto from time to time. The Schedules and any amendments
thereto, including exhibits, may be examined and copies may be obtained from the
offices of the Commission in the manner set forth in "THE TENDER OFFER -- 6.
Certain Information Concerning the Trust" (except that such information will not
be available at the regional offices of the Commission).
 
     NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR MAKE ANY
REPRESENTATION ON BEHALF OF THE PURCHASER OR DEVON NOT CONTAINED IN THIS OFFER
TO PURCHASE OR IN THE LETTER OF TRANSMITTAL, AND, IF GIVEN OR MADE, ANY SUCH
INFORMATION OR REPRESENTATION MUST NOT BE RELIED ON AS HAVING BEEN AUTHORIZED.
NEITHER THE DELIVERY OF THE OFFER TO PURCHASE NOR ANY PURCHASE PURSUANT TO THE
OFFER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS BEEN
NO CHANGE IN THE AFFAIRS OF THE PURCHASER, DEVON OR THE TRUST SINCE THE DATE AS
OF WHICH INFORMATION IS FURNISHED OR THE DATE OF THIS OFFER TO PURCHASE.
 
February 13, 1998                             DEVON ACQUISITION CORPORATION
 
                                       21
<PAGE>   24
 
                                                                      SCHEDULE I
 
                        DIRECTORS AND EXECUTIVE OFFICERS
                           OF THE PURCHASER AND DEVON
 
     1. THE PURCHASER. Set forth below are the name, business address and
present principal occupation or employment, and material occupations, positions,
offices or employments for the past five years of each director and executive
officer of the Purchaser. Each of the persons listed below is a United States
citizen. None of such individuals owns any Units except Darryl G. Smette who
purchased 1,000 Units of the Trust on January 7, 1998.
 
<TABLE>
<CAPTION>
                      PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT; MATERIAL OCCUPATIONS,
       NAME               POSITIONS, OFFICES OR EMPLOYMENTS FOR THE PAST FIVE YEARS
       ----           -----------------------------------------------------------------
<S>                   <C>
J. Larry Nichols      J. Larry Nichols is a director and the President and Chief
                      Executive Officer of the Purchaser. See description below for
                      additional information.
J. Michael Lacey      J. Michael Lacey is a Vice President of the Purchaser. See
                      description below for additional information.
Duke R. Ligon         Duke R. Ligon is a Vice President of the Purchaser. See
                      description below for additional information.
H. Allen Turner       H. Allen Turner is a Vice President of the Purchaser. See
                      description below for additional information.
Gary L. McGee         Gary L. McGee is the Treasurer of the Purchaser. See description
                      below for additional information.
Marian J. Moon        Marian J. Moon is the Corporate Secretary of the Purchaser. See
                      description below for additional information.
Darryl G. Smette      Darryl G. Smette is a director and a Vice President of the
                      Purchaser. See description below for additional information.
William T. Vaughn     William T. Vaughn is a director and a Vice President of the
                      Purchaser. See description below for additional information.
</TABLE>
 
     2. DEVON. Set forth below are the name, business address and present
principal occupation or employment, and material occupations, positions, offices
or employments for the past five years of each director and executive officer of
Devon. The business address of each director and executive officer, unless
otherwise indicated below, is 20 North Broadway, Suite 1500, Oklahoma City, OK
73102-8260. Each of the persons listed below is a United States citizen except
where specifically noted. None of such individuals owns any Units except Darryl
G. Smette who purchased 1,000 Units of the Trust on January 7, 1998.
 
<TABLE>
<CAPTION>
                      PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT; MATERIAL OCCUPATIONS,
       NAME               POSITIONS, OFFICES OR EMPLOYMENTS FOR THE PAST FIVE YEARS
       ----           -----------------------------------------------------------------
<S>                   <C>
Thomas F. Ferguson    Thomas F. Ferguson, age 61, a British citizen, has been a
                      director of Devon since 1982. He is Managing Director of
                      Englewood, N.V., a wholly-owned subsidiary of Kuwaiti-based
                      Al-Futtooh Investments WLL. His 20-year association with the
                      principals of Al-Futtooh has allowed him to represent them on the
                      board of directors of Devon and other companies in which they
                      invest. Those interests include investments in hotels,
                      pharmaceuticals, an investment banking company and a venture
                      capital fund. Mr. Ferguson is a Canadian qualified Certified
                      General Accountant and was formerly employed by the Economist
                      Intelligence Unit of London as a financial consultant.
                      Business Address: President, United Gulf Limited, 7 Old Park
                      Lane, Fifth Floor, London W1Y 3LJ England.
</TABLE>
 
                                       22
<PAGE>   25
<TABLE>
<CAPTION>
                      PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT; MATERIAL OCCUPATIONS,
       NAME               POSITIONS, OFFICES OR EMPLOYMENTS FOR THE PAST FIVE YEARS
       ----           -----------------------------------------------------------------
<S>                   <C>
 
J. Larry Nichols      J. Larry Nichols, age 55, co-founded Devon with his father. He
                      has been a director since 1971, President since 1976 and Chief
                      Executive Officer since 1980. Mr. Nichols is active in industry
                      and business groups, serving as vice president of the Independent
                      Petroleum Association of America (IPAA), president of the
                      Domestic Petroleum Council and president of the Oklahoma Nature
                      Conservancy. In addition, Mr. Nichols is a director of the
                      Independent Petroleum Association of New Mexico, the Oklahoma
                      Independent Petroleum Association, the National Petroleum Council
                      and the National Association of Manufacturers. He also serves as
                      a director of Smedvig asa, a Norwegian shipping manufacturing
                      company, and CMI Corporation, which designs and manufactures
                      automated road construction equipment. Both of these companies
                      are traded on the New York Stock Exchange. He also serves on the
                      Board of Governors of the American Stock Exchange. Mr. Nichols
                      holds a geology degree from Princeton University and a law degree
                      from the University of Michigan. He served as a law clerk to Mr.
                      Chief Justice Earl Warren and Mr. Justice Tom Clark of the U.S.
                      Supreme Court. Mr. Nichols is a member of the Oklahoma Bar
                      Association.
Lawrence H. Towell    Lawrence H. Towell, age 54, was appointed to Devon's board of
                      directors in December, 1996. Mr. Towell is the Vice President of
                      Acquisitions in the Strategic Planning/Business Development of
                      Kerr-McGee Corporation. He has been involved with Kerr-McGee's
                      acquisition activities since 1984. Prior to his current position,
                      he served Kerr-McGee in various positions since 1975, including
                      Vice President of Engineering and Vice President of Natural Gas
                      Sales. Prior to his employment at Kerr-McGee, Mr. Towell worked
                      for Shell Oil Co. for eight years serving in various engineering
                      capacities in various domestic locations. Subsequent to his
                      employment at Shell, he was manager of HK Properties for
                      Howell-Kerr Enterprises in Oklahoma City. Mr. Towell received his
                      bachelor's degree in mechanical engineering from Yale University.
                      He is a member of the Society of Petroleum Engineers, the IPAA
                      and the Yale University Science and Engineering Association.
                      Business Address: Vice President -- Acquisition, Exploration and
                      Production Division, Kerr-McGee Corporation, 123 Robert S. Kerr
                      Avenue, Oklahoma City, OK 73102.
David M. Gavrin       David M. Gavrin, age 63, has been a director of Devon since 1979.
                      In addition to managing his personal investments, he serves as a
                      director of several other companies as well as for Devon. The
                      companies for which Mr. Gavrin serves as a director include
                      Heidemij, N.V., a worldwide environmental services company; New
                      York Federal Savings Bank and United American Energy Corp., an
                      independent power producer. In addition, Mr. Gavrin was
                      associated with Drexel Burnham Lambert Incorporated for 14 years
                      as First Vice President and was a General Partner of Windcrest
                      Partners, an investment partnership, for 10 years.
                      Business Address: 1865 Palmer Avenue, Suite 108, Larchmont, NY
                      10538.
</TABLE>
 
                                       23
<PAGE>   26
<TABLE>
<CAPTION>
                      PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT; MATERIAL OCCUPATIONS,
       NAME               POSITIONS, OFFICES OR EMPLOYMENTS FOR THE PAST FIVE YEARS
       ----           -----------------------------------------------------------------
<S>                   <C>
Tom J. McDaniel       Tom J. McDaniel, age 59, was appointed to Devon's board of
                      directors in December, 1996. Mr. McDaniel has been Kerr-McGee
                      Corporation's Vice-Chairman of the Board of Directors since
                      February 1, 1997. He joined Kerr-McGee as associate general
                      counsel in 1984, became senior vice president in 1986 and served
                      as senior vice president and corporate secretary from 1989 to
                      1997. Prior to joining Kerr-McGee, Mr. McDaniel was engaged in
                      the private practice of law for 18 years. In 1981 he was
                      appointed Administrative Director of State Courts by the Oklahoma
                      Supreme Court. Mr. McDaniel serves on the board of directors of
                      the National Association of Manufacturers. A member of the
                      Oklahoma and American Bar Associations, Mr. McDaniel holds an
                      undergraduate degree in business from Northwestern Oklahoma State
                      University and a law degree from the University of Oklahoma.
                      Business Address: Vice Chairman of the Board, Kerr-McGee
                      Corporation, 123 Robert S. Kerr Avenue, Oklahoma City, OK 73102.
John W. Nichols       John W. Nichols, age 83, is the co-founder of Devon and has been
                      Chairman of the Board of Directors since 1971. He is a founding
                      partner of Blackwood & Nichols Co., which was the original
                      operator of the NEBU Interests. Mr. Nichols is a non-practicing
                      Certified Public Accountant.
Luke R. Corbett       Luke R. Corbett, age 50, was appointed to Devon's board of
                      directors in December, 1996. Mr. Corbett is Kerr-McGee
                      Corporation's Chairman of the Board of Directors and Chief
                      Executive Officer, a position he has held since February 1, 1997.
                      He joined Kerr-McGee in 1985 as vice president of geophysics, was
                      named senior vice president of exploration for the Exploration
                      and Production Division in 1987, senior vice president in 1991
                      and President and Chief Operating Officer in 1995. Prior to
                      joining Kerr-McGee, Mr. Corbett was employed by Amoco Production
                      Company as a geophysicist. He later joined Aminoil, Inc. where he
                      held the position of vice president of domestic exploration. Mr.
                      Corbett is also a director of OGE Energy Corp. He is a member of
                      the American Association of Petroleum Geologists, Society of
                      Exploration Geophysicists and is on the board of the American
                      Petroleum Institute. He is a member of the Domestic Petroleum
                      Council and a trustee for the American Geological Institute
                      Foundation and is chairman of the advisory board of the Energy
                      and Geoscience Institute at the University of Utah. Mr. Corbett
                      obtained his bachelor's degree in mathematics from the University
                      of Georgia.
                      Business Address: Chairman & Chief Executive Officer, Kerr-McGee
                      Corporation, 123 Robert S. Kerr Avenue, Oklahoma City, OK 73102.
Michael E. Gellert    Michael E. Gellert, age 66, has been a director of Devon since
                      1971. In addition to managing his personal investments and
                      serving as a director of Devon, Mr. Gellert serves on the board
                      of several other companies. These include Humana Inc., owners of
                      managed health care facilities; Premier Parks, Inc., amusement
                      parks operator; Seacor Holdings, Inc., owners and operators of
                      marine equipment; and Regal Cinemas, Inc., owners and operators
                      of multiplex motion picture theaters. Mr. Gellert is also a
                      member of the Putnam Trust Company Advisory Board to The Bank of
                      New York. Mr. Gellert was associated with the Drexel Burnham
                      Lambert Group and its predecessors for 31 years, including 17
                      years as a director, and served in various executive capacities
                      for its wholly-owned subsidiary, Drexel Burnham Lambert
                      Incorporated.
                      Business Address: Windcrest Partners, 122 East 42nd Street, New
                      York, NY 10168.
</TABLE>
 
                                       24
<PAGE>   27
<TABLE>
<CAPTION>
                      PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT; MATERIAL OCCUPATIONS,
       NAME               POSITIONS, OFFICES OR EMPLOYMENTS FOR THE PAST FIVE YEARS
       ----           -----------------------------------------------------------------
<S>                   <C>
H. R. Sanders, Jr.    H. R. Sanders, Jr., age 65, joined Devon in 1981 as a Director
                      and Executive Vice President. He retired as Executive Vice
                      President in June, 1997, but continues as a member of the Devon
                      Board. Prior to joining Devon, Mr. Sanders was associated with
                      RepublicBank Dallas, N.A., serving from 1970 to 1981 as its
                      Senior Vice President with direct responsibility for independent
                      oil and gas producer and mining loans. Mr. Sanders is a member of
                      the IPAA, Texas Independent Producers and Royalty Owners
                      Association, Oklahoma Independent Petroleum Association and a
                      past director of Triton Energy Corporation.
                      Business Address: Route 1, 678 H, Morgan, TX 76671.
J. Michael Lacey      J. Michael Lacey, age 52, joined Devon as Vice
                      President -- Operations and Exploration in 1989. Prior to his
                      employment with Devon, Mr. Lacey served as General Manager in
                      Tenneco Oil Company's Mid-Continent and Rocky Mountain Divisions.
                      He holds both undergraduate and graduate degrees in Petroleum
                      Engineering from the Colorado School of Mines, is a Registered
                      Professional Engineer and a member of the Society of Petroleum
                      Engineers and the American Association of Petroleum Geologists.
Duke R. Ligon         Duke R. Ligon, age 56, joined Devon on February 17, 1997, as its
                      Vice President -- General Counsel. In addition to his 12 years of
                      energy law practice, most recently as a partner of a large New
                      York City law firm, he was an investment banker at Bankers Trust
                      Company of New York for 10 years. Mr. Ligon also served for three
                      years in various positions with the Federal Energy
                      Administration, U. S. Department of the Interior and Department
                      of Energy in Washington, D.C. Mr. Ligon's primary
                      responsibilities at Devon include assisting in the Company's
                      acquisition efforts and representing the Company in various legal
                      matters including litigation. Mr. Ligon holds an undergraduate
                      degree in business from Westminster College and a law degree from
                      the University of Texas School of Law.
Darryl G. Smette      Darryl G. Smette, age 50, Vice President of Marketing and
                      Administrative Planning since 1989, joined Devon in 1986 as
                      Manager of Gas Marketing. Mr. Smette's educational background
                      includes an undergraduate degree from Minot State College and a
                      masters degree from Wichita State University. His marketing
                      background includes 15 years with Energy Reserves Group, Inc./BHP
                      Petroleum (Americas), Inc., the last position being Director of
                      Marketing. He is also an oil and gas industry instructor approved
                      by the University of Texas' Department of Continuing Education.
                      Mr. Smette is a member of the Oklahoma Independent Producers
                      Association, Natural Gas Association of Oklahoma and the American
                      Gas Association.
H. Allen Turner       H. Allen Turner, age 45, has been responsible for Devon's
                      corporate finance and capital formation activities as Vice
                      President of Corporate Development since 1982. In 1981 he served
                      as Executive Vice President of Palo Pinto/Harken Drilling
                      Programs. For the six prior years he was associated with Merrill
                      Lynch with various responsibilities including Regional Tax
                      Investments Manager. He is a member of the Petroleum Investor
                      Relations Association, and serves on the IPAA Capital Markets
                      Committee. He is the immediate past chairman of the IPAA Oil and
                      Gas Investment Symposium. Mr. Turner is a member of the Financial
                      Executives Institute. Mr. Turner received his bachelor's degree
                      from Duke University.
</TABLE>
 
                                       25
<PAGE>   28
<TABLE>
<CAPTION>
                      PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT; MATERIAL OCCUPATIONS,
       NAME               POSITIONS, OFFICES OR EMPLOYMENTS FOR THE PAST FIVE YEARS
       ----           -----------------------------------------------------------------
<S>                   <C>
William T. Vaughn     William T. Vaughn, age 51, is Devon's Vice President of Finance
                      in charge of commercial banking functions, accounting, tax and
                      information services. Mr. Vaughn was elected in 1987 to his
                      present position. Prior to that he was Controller of Devon from
                      1983 to 1987. Mr. Vaughn's prior experience includes serving as
                      Controller with Marion Corporation for two years and employment
                      with Arthur Young & Co. for seven years with various duties
                      including audit manager. He is a Certified Public Accountant and
                      a member of the American Institute of Certified Public
                      Accountants and the Oklahoma Society of Certified Public
                      Accountants. He is a graduate of the University of Arkansas with
                      a Bachelor of Science degree.
Danny J. Heatly       Danny J. Heatly, age 42, has been Devon's Controller since 1989.
                      Prior to joining Devon, Mr. Heatly was associated with Peat
                      Marwick Main & Co. in Oklahoma City for ten years with various
                      duties including senior audit manager. He is a Certified Public
                      Accountant and a member of the American Institute of Certified
                      Public Accountants and the Oklahoma Society of Certified Public
                      Accountants. He graduated with a Bachelor of Accountancy degree
                      from the University of Oklahoma.
Gary L. McGee         Gary L. McGee, age 48, was elected Treasurer in 1983, having
                      first served as Devon's Controller. Mr. McGee is a member of the
                      Executive Committees of both the Rocky Mountain Oil & Gas
                      Association and the Petroleum Association of Wyoming. He is also
                      a member of the Petroleum Accounting Society of Oklahoma City and
                      has been active in varied accounting functions with several
                      companies in the industry. He served as Vice President of Finance
                      with KSA Industries, Inc., a private holding company with various
                      interests including oil and gas exploration. Mr. McGee also held
                      various accounting positions with Adams Resources and Energy Co.
                      and Mesa Petroleum Company. He received his accounting degree
                      from the University of Oklahoma.
Marian J. Moon        Marian J. Moon, age 47, was elected Corporate Secretary in 1994.
                      Ms. Moon has served Devon in various capacities since 1984,
                      including her current position as Manager of Corporate Finance.
                      She has also served as Assistant Secretary with responsibilities
                      including compliance with SEC and stock exchange regulations.
                      Prior to joining Devon, Ms. Moon was employed for eleven years by
                      Amarex, Inc., an Oklahoma City based oil and natural gas
                      production and exploration firm, where she served most recently
                      as treasurer. Ms. Moon is a member of the Petroleum Investor
                      Relations Association and the American Society of Corporate
                      Secretaries. She is a graduate of Valparaiso University.
</TABLE>
 
                                       26
<PAGE>   29
 
     Facsimile copies of the Letter of Transmittal will be accepted. The Letter
of Transmittal, certificates for Units and any other required documents should
be sent or delivered by each Unit holder or his broker, dealer, commercial bank,
trust company or other nominee to the Depositary at one of the addresses set
forth below:
 
                        THE DEPOSITARY FOR THE OFFER IS:
 
                        HARRIS TRUST COMPANY OF NEW YORK
 
<TABLE>
<C>                             <C>                             <C>
       By Hand Delivery            Facsimile Transmission:                 By Mail:
        or Overnight:                   (212) 701-7636               Wall Street Station
        88 Pine Street                  (212) 701-7637                  P.O. Box 1023
          19th Floor                                               New York, NY 10268-1023
      New York, NY 10005          (For Eligible Institutions
                                            Only)
                                    Confirm by Telephone:
                                        (212) 701-7624
</TABLE>
 
     Any questions or requests for assistance or additional copies of this Offer
to Purchase, the Letter of Transmittal or the Notice of Guaranteed Delivery may
be directed to the Information Agent or the Dealer Manager at their respective
telephone numbers and locations listed below. You may also contact your broker,
dealer, commercial bank, trust company or nominee for assistance concerning the
Offer.
 
                    THE INFORMATION AGENT FOR THE OFFER IS:
 
                             D.F. KING & CO., INC.
                                77 WATER STREET
                            NEW YORK, NEW YORK 10005
                         CALL TOLL-FREE (800) 431-9642
 
                      THE DEALER MANAGER FOR THE OFFER IS:
 
                              SALOMON SMITH BARNEY
                            SEVEN WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
                                 (212) 783-8527

<PAGE>   1
 
                             LETTER OF TRANSMITTAL
 
                   TO TENDER UNITS OF BENEFICIAL INTEREST OF
 
                              BURLINGTON RESOURCES
                          COAL SEAM GAS ROYALTY TRUST
 
           PURSUANT TO THE OFFER TO PURCHASE DATED FEBRUARY 13, 1998,
                        AS AMENDED FROM TIME TO TIME, BY
 
                         DEVON ACQUISITION CORPORATION
                          A WHOLLY-OWNED SUBSIDIARY OF
 
                            DEVON ENERGY CORPORATION
 
                  THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE
               AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON FRIDAY,
                  MARCH 13, 1998, UNLESS THE OFFER IS EXTENDED
 
                        The Depositary for the Offer is:
 
                        HARRIS TRUST COMPANY OF NEW YORK
 
<TABLE>
<C>                             <C>                             <C>
       By Hand Delivery            Facsimile Transmission:                 By Mail:
        or Overnight:                   (212) 701-7636               Wall Street Station
        88 Pine Street                  (212) 701-7637                  P.O. Box 1023
          19th Floor                                               New York, NY 10268-1023
      New York, NY 10005      (For Eligible Institutions Only)
                                    Confirm by Telephone:
                                        (212) 701-7624
</TABLE>
 
                             ---------------------
 
     DELIVERY OF THIS LETTER OF TRANSMITTAL TO AN ADDRESS, OR TRANSMISSION OF
INSTRUCTIONS VIA A FACSIMILE NUMBER, OTHER THAN AS SET FORTH ABOVE DOES NOT
CONSTITUTE A VALID DELIVERY. YOU MUST SIGN THIS LETTER OF TRANSMITTAL IN THE
APPROPRIATE SPACE PROVIDED BELOW AND COMPLETE THE SUBSTITUTE FORM W-9 INCLUDED
HEREIN.
<PAGE>   2
 
     THE INSTRUCTIONS SET FORTH IN THIS LETTER OF TRANSMITTAL SHOULD BE READ
CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL IS COMPLETED.
 
     This Letter of Transmittal is to be completed by holders of Units (as
defined below) either if (1) certificates evidencing Units are to be forwarded
herewith or (2) unless an Agent's Message (as defined in the Offer to Purchase
(as defined below)) is utilized, delivery of Units is to be made by book-entry
transfer to the Depositary's account at The Depository Trust Company ("DTC") or
Philadelphia Depository Trust Company ("PDTC") (the "Book-Entry Transfer
Facilities") pursuant to the procedures set forth in "THE TENDER OFFER -- 2.
Procedures for Tendering Units" of the Offer to Purchase. Unit holders whose
certificates are not immediately available, or who are unable to deliver the
Units and all other documents required hereby to the Depositary on or prior to
the Expiration Date or who cannot comply with the book-entry transfer procedures
on a timely basis, may nevertheless tender their Units pursuant to the
guaranteed delivery procedures set forth in "THE TENDER OFFER -- 2. Procedures
for Tendering Units" of the Offer to Purchase. See Instruction 2.
 
<TABLE>
<S>                                              <C>                <C>            <C>
- ----------------------------------------------------------------------------------------------------
                                   DESCRIPTION OF UNITS TENDERED
- ----------------------------------------------------------------------------------------------------
     NAME(S) AND ADDRESS(ES) OF REGISTERED                         UNITS TENDERED
   OWNERS (PLEASE FILL IN, IF BLANK, EXACTLY                  (ATTACH ADDITIONAL SIGNED
     AS NAME(S) APPEAR(S) ON CERTIFICATES                        LIST IF NECESSARY)
- ----------------------------------------------------------------------------------------------------
                                                                     TOTAL NUMBER
                                                                       OF UNITS          NUMBER OF
                                                   CERTIFICATE      REPRESENTED BY         UNITS
                                                   NUMBER(S)(1)    CERTIFICATE(S)(1)     TENDERED(2)
- ----------------------------------------------------------------------------------------------------
 
                                                 ---------------------------------------------------
 
                                                 ---------------------------------------------------
 
                                                 ---------------------------------------------------
 
                                                 ---------------------------------------------------
 
                                                    TOTAL UNITS
- ----------------------------------------------------------------------------------------------------
 (1) Need not be completed by Unit holders tendering by book-entry transfer.
 (2) Unless otherwise indicated, it will be assumed that all Units are being tendered. See
     Instruction 4.
- ----------------------------------------------------------------------------------------------------
</TABLE>
 
     The names and addresses of the registered holders should be printed, if not
already printed above, exactly as they appear on the certificates representing
Units tendered hereby. The certificates and number of Units that the undersigned
wishes to tender should be indicated in the appropriate boxes.
 
[ ]   CHECK HERE IF TENDERED UNITS ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER
      MADE TO THE DEPOSITARY'S ACCOUNT AT ONE OF THE BOOK-ENTRY TRANSFER
      FACILITIES AND COMPLETE THE FOLLOWING:
 
      Name of Tendering Institution:
 
      --------------------------------------------------------------------------
 
      Check the box of applicable Book-Entry Transfer Facility:
           [ ]  DTC
           [ ]  PDTC
 
      Account Number:
      --------------------------------------------------------------------------
 
      Transaction Code Number:
      --------------------------------------------------------------------------
<PAGE>   3
 
[ ]   CHECK HERE IF TENDERED UNITS ARE BEING DELIVERED PURSUANT TO A NOTICE OF
      GUARANTEED DELIVERY PREVIOUSLY SENT TO THE DEPOSITARY AND COMPLETE THE
      FOLLOWING:
 
      Name(s) of Registered Holder(s): 
                                      ------------------------------------------
 
      Transaction Code Number:
                              --------------------------------------------------
 
      Date of Execution of Notice of Guaranteed Delivery:
                                                         -----------------------
 
      Name of Institution that Guaranteed Delivery:
                                                   -----------------------------
 
      If Delivered by Book-Entry Transfer, check the box of the applicable
        Book-Entry Transfer Facility and complete the following:
           [ ]  DTC
           [ ]  PDTC
 
      Name of Tendering Institution:
                                    --------------------------------------------
 
      Account Number:
                     -----------------------------------------------------------
 
      Transaction Code Number:
                              --------------------------------------------------
<PAGE>   4
 
                    NOTE: SIGNATURES MUST BE PROVIDED BELOW.
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY.
 
Ladies and Gentlemen:
 
     The undersigned hereby tenders to Devon Acquisition Corporation, a Delaware
corporation (the "Purchaser"), the above-described Units of Beneficial Interest
(the "Units") of Burlington Resources Coal Seam Gas Royalty Trust, a Delaware
business trust (the "Trust"), pursuant to the Purchaser's offer to purchase any
and all outstanding Units at a price of $8.75 per unit, net to the seller in
cash, without interest (the "Purchase Price"), upon the terms and subject to the
conditions set forth in the Purchaser's Offer to Purchase dated February 13,
1998, as amended from time to time (the "Offer to Purchase"), receipt of which
is hereby acknowledged, and this Letter of Transmittal (which, together with any
amendments or supplements to such documents, constitute the "Offer").
 
     Subject to, and effective upon, the acceptance for payment of, and payment
for, the Units tendered herewith in accordance with the terms and subject to the
conditions of the Offer (including, if the Offer is extended or amended, the
terms and conditions of any such extension or amendment), the undersigned hereby
sells, assigns and transfers to, or upon the order of, the Purchaser all right,
title and interest in and to all the Units that are being tendered hereby (and
any and all other Units or other securities, rights or distributions issued or
issuable in respect of such Units on or after the date of the Offer to Purchase,
other than regular cash distributions and associated tax credits declared by the
Trust having a record date prior to the date of transfer to the Purchaser on the
Trust's transfer records of the Units tendered herewith as provided in the Offer
to Purchase (such Units or other securities, rights or distributions other than
such regular cash distributions and associated tax credits being referred to
herein as "Special Distributions")) and irrevocably constitutes and appoints the
Depositary the true and lawful agent and attorney-in-fact of the undersigned
with respect to such Units (and any Special Distributions), with full power of
substitution (such power of attorney being deemed to be an irrevocable power
coupled with an interest), to: (a) deliver certificates for such Units (and any
Special Distributions) or transfer ownership of such Units (and any Special
Distributions) on the account books maintained by a Book-Entry Transfer Facility
together, in either such case, with all accompanying evidences of transfer and
authenticity, to, or upon the order of, the Purchaser, (b) present such Units
(and any Special Distributions) for transfer on the Trust transfer records and
(c) receive all benefits and otherwise exercise all rights of beneficial
ownership of such Units (and any Special Distributions), all in accordance with
the terms of the Offer.
 
     The undersigned hereby irrevocably appoints H. Allen Turner and Marian J.
Moon, and each of them, and any other designees of the Purchaser, the
attorneys-in-fact and proxies of the undersigned, each with full power of
substitution, to the full extent of the undersigned's rights with respect to the
Units tendered by the undersigned and accepted for payment by the Purchaser and
with respect to any and all other Special Distributions. This power of attorney
and proxy are irrevocable and coupled with an interest in the tendered Units.
This appointment will be effective if, when and only to the extent that, the
Purchaser accepts Units for payment pursuant to the Offer. Upon such acceptance
for payment, all powers of attorney and proxies given by the undersigned with
respect to such Units and any Special Distributions will, without further
action, be revoked and no subsequent powers of attorney or proxies may be given
by the undersigned (and, if given, will not be deemed effective). The designees
of the Purchaser will, with respect to the Units and any Special Distribution,
be empowered to exercise all voting and other rights of such Unit holder with
respect to such Units and any Special Distributions as they, in their sole
discretion, may deem proper at any meeting of the Unit holders, or any
adjournment or postponement thereof, or by written consent or otherwise. The
Purchaser reserves the right to require that, in order for Units to be deemed
validly tendered, immediately upon the Purchaser's acceptance for payment of
such Units, the Purchaser must be able to exercise full voting rights with
respect to such Units, including voting at any meeting of Unit holders.
 
     The undersigned hereby represents and warrants that the undersigned has
full power and authority to tender, sell, assign and transfer the Units tendered
hereby (and any Special Distributions), and, when the same are accepted for
payment by the Purchaser, the Purchaser will acquire good, marketable and
unencumbered title thereto, free and clear of all liens, restrictions, charges
and encumbrances, and the same
<PAGE>   5
 
will not be subject to any adverse claim. The undersigned will, upon request,
execute and deliver any additional documents deemed by the Depositary or the
Purchaser to be necessary or desirable to complete or confirm the sale,
assignment and transfer of the Units tendered hereby (and any Special
Distributions).
 
     All authority conferred or agreed to be conferred pursuant to this Letter
of Transmittal shall be binding upon the personal representatives, successors,
assigns, heirs, executors, administrators, trustees in bankruptcy and legal
representatives of the undersigned and shall not be affected by, and shall
survive, the death or incapacity of the undersigned. Except as stated in the
Offer to Purchase, this tender is irrevocable.
 
     The undersigned understands that tenders of Units pursuant to any one of
the procedures described in "THE TENDER OFFER -- 2. Procedures for Tendering
Units" of the Offer to Purchase and in the instructions hereto will constitute
an agreement between the undersigned and the Purchaser upon the terms and
subject to the conditions of the Offer. Without limiting the foregoing, if the
Offer Price is amended in accordance with the Offer, the price to be paid to the
undersigned will be the amended price notwithstanding the fact that a different
price is stated in this Letter of Transmittal. The undersigned recognizes that,
under certain circumstances set forth in the Offer to Purchase, the Purchaser
may not be required to accept for payment any of the Units tendered hereby.
 
     The undersigned acknowledges that, subject to the applicable rules of the
Securities and Exchange Commission (the "Commission"), the Purchaser expressly
reserves the right, in its sole discretion, at any time or from time to time (i)
to extend the period of time during which the Offer is open and thereby delay
acceptance for payment of, and the payment for, all Units validly tendered by
giving oral or written notice of such extension to the Depositary and (ii) to
amend the Offer in any respect, by giving oral or written notice of such
amendment to the Depositary. The undersigned acknowledges that these rights
reserved by the Purchaser are in addition to the Purchaser's rights to terminate
the Offer pursuant to "THE TENDER OFFER -- 14. Certain Conditions of the Offer"
of the Offer to Purchase. UNDER NO CIRCUMSTANCES WILL INTEREST BE PAID ON THE
PURCHASE PRICE FOR TENDERED UNITS, WHETHER OR NOT THE PURCHASER EXERCISES ITS
RIGHTS TO EXTEND THE OFFER.
 
     The undersigned also acknowledges that if any or all of the conditions set
forth in "THE TENDER OFFER -- 14. Certain Conditions of the Offer" of the Offer
to Purchase are not satisfied prior to the Expiration Date, the Purchaser
reserves the right (but shall not be obligated) in its sole discretion to (i)
decline to purchase any of the Units tendered in the Offer, terminate the Offer
and return all tendered Units to the tendering Unit holders, (ii) waive or amend
any or all of the conditions to the Offer to the extent permitted by applicable
law and, subject to complying with applicable rules and regulations of the
Commission, purchase all Units validly tendered, (iii) extend the Offer and,
subject to the right of the Unit holders to withdraw Units until the Expiration
Date, retain the Units that have been tendered during the period or periods for
which the Offer is extended or (iv) amend the Offer.
 
     Unless otherwise indicated herein under "Special Payment Instructions,"
please issue the check for the Purchase Price of any Units purchased, and return
any certificates for Units not tendered or not purchased, in the name(s) of the
undersigned (and, in the case of Units tendered by book-entry transfer, by
credit to the account at a Book-Entry Transfer Facility). Similarly, unless
otherwise indicated under "Special Delivery Instructions," please mail the check
for the Purchase Price for any Units purchased, and return any certificates for
Units not tendered or not purchased (and accompanying documents, as
appropriate), to the undersigned at the address shown below the undersigned's
signature(s). In the event that the Special Delivery Instructions and/or the
Special Payment Instructions are completed, please issue the check for the
Purchase Price of any Units purchased, and return any certificates for Units not
tendered or not purchased, in the name(s) of, and/or mail said check and any
certificates to, the person(s) so indicated. Unless otherwise indicated under
"Special Payment Instructions," please credit any Units tendered herewith by
book-entry transfer that are not accepted for payment by crediting the account
at a Book-Entry Transfer Facility. The undersigned recognizes that the Purchaser
has no obligation, pursuant to the Special Payment Instructions, to transfer any
Units from the name of the registered holder(s) thereof if the Purchaser does
not accept for payment any of the Units so tendered.
<PAGE>   6
 
             ------------------------------------------------------
 
                          SPECIAL PAYMENT INSTRUCTIONS
                        (SEE INSTRUCTIONS 1, 5, 6 AND 7)
 
        To be completed ONLY if the check for the Purchase Price of Units
   purchased and/or certificates for Units not tendered or not purchased are
   to be issued in the name of someone other than the undersigned, or if
   Units tendered by book-entry transfer that are not purchased are to be
   returned by credit to an account at the Book-Entry Transfer Facility other
   than the account designated above.
 
   Issue check and/or certificate(s) to:
 
   Name:
        ----------------------------------------------------------
                               (Please Print)
 
   Address:
           -------------------------------------------------------
 
           -------------------------------------------------------
                             (Include Zip Code)
 
           -------------------------------------------------------
                 (Tax Identification or Social Security Number)
                           (See Substitute Form W-9)
 
   [ ] Credit unpurchased Units tendered by book-entry transfer to the
       account set forth below:
 
   Check appropriate box:
        [ ] DTC
 
        [ ] PDTC
 
   Account Number:
                  ------------------------------------------------

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


             ------------------------------------------------------
 
                         SPECIAL DELIVERY INSTRUCTIONS
                        (SEE INSTRUCTIONS 1, 5, 6 AND 7)
 
        To be completed ONLY if the check for the purchase price of Units
   purchased and/or certificates for Units not tendered or not purchased are
   to be mailed to someone other than the undersigned or to the undersigned
   at an address other than that shown below the undersigned's signature.
 
   Issue check and/or certificate(s) to:
 
   Name:
        ----------------------------------------------------------
                                 (Please Print)
 
   Address:
           -------------------------------------------------------
 
           -------------------------------------------------------
                              (Include Zip Code)
 
           -------------------------------------------------------
               (Tax Identification or Social Security Number)
                        (See Substitute Form W-9)
 
             ------------------------------------------------------
<PAGE>   7
 
                                   SIGN HERE
                   (ALSO COMPLETE SUBSTITUTE FORM W-9 BELOW)
 
- --------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
                       (Signature(s) of Unit holder(s)*)

                          Dated: 
                                --------------------
 
     * Must be signed by registered holder(s) as name(s) appear(s) on the
certificate(s) for the Units or on a security position listing or by person(s)
authorized to become registered holder(s) by certificates and documents
transmitted herewith. If signature is by trustees, executors, administrators,
guardians, attorneys-in-fact, officers of corporations or others acting in a
fiduciary or representative capacity, please provide the following information
and see Instruction 5.
 
Name(s):
        ------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
                                 (Please Print)
 
Name of Firm (if applicable):
                             ---------------------------------------------------
 
Capacity (Full Title):
                      ----------------------------------------------------------
 
Address:
         -----------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
                               (Include Zip Code)
 
Daytime Area Code and Telephone Number:
                                       -----------------------------------------
 
Taxpayer Identification or Social Security No.:
                                               ---------------------------------
 
                           GUARANTEE OF SIGNATURE(S)
                   (IF REQUIRED -- SEE INSTRUCTIONS 1 AND 5)
 
FOR USE BY FINANCIAL INSTITUTIONS ONLY. PLACE MEDALLION GUARANTEE IN SPACE
BELOW.
 
Authorized Signature:
                     -----------------------------------------------------------
 
Name:
     ---------------------------------------------------------------------------
                                 (Please Print)
 
Name of Firm:
             -------------------------------------------------------------------
 
Address:
         -----------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
                               (Include Zip Code)
 
Area Code and Telephone Number:
                               -------------------------------------------------
 
Dated:
      ---------------------------
<PAGE>   8
 
                                  INSTRUCTIONS
             FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER
 
     1. GUARANTEE OF SIGNATURES. Signatures on all Letters of Transmittal must
be guaranteed by a firm that is a bank, broker, dealer, credit union, savings
association or other entity that is a member in good standing of the Securities
Transfer Agent's Medallion Program (each, an "Eligible Institution") unless the
Units tendered thereby are tendered (i) by a registered holder of Units who has
not completed either the box labeled "Special Payment Instructions" or the box
labeled "Special Delivery Instructions" on the Letter of Transmittal or (ii) for
the account of an Eligible Institution. See Instruction 5. If the certificates
for Units are registered in the name of a person other than the signer of this
Letter of Transmittal, or if payment is to be made to, or certificates for
unpurchased Units are to be issued or returned to, a person other than the
registered owner, then the tendered certificates must be endorsed or accompanied
by appropriate transfer powers, in either case signed exactly as the name or
names of the registered owner or owners appear on the certificates, with the
signatures on the certificates or transfer powers guaranteed by an Eligible
Institution as provided herein. See Instruction 5.
 
     2. DELIVERY OF LETTER OF TRANSMITTAL AND CERTIFICATES; GUARANTEED DELIVERY
PROCEDURES. This Letter of Transmittal is to be completed by Unit holders either
if certificates are to be forwarded herewith or, unless an Agent's Message is
utilized, if delivery of Units is to be made by book-entry pursuant to the
procedures set forth in "THE TENDER OFFER -- 2. Procedures for Tendering Units"
of the Offer to Purchase. Certificates for all physically delivered Units, or a
confirmation of a book-entry transfer into the Depositary's account at a
Book-Entry Transfer Facility of all Units delivered electronically, as well as a
properly completed and duly executed Letter of Transmittal (or facsimile
thereof), together with any required signature guarantees, or the Agent's
Message in the case of a book-entry transfer, and any other documents required
by this Letter of Transmittal, must be received by the Depositary at one of its
addresses set forth on the front page of this Letter of Transmittal prior to the
Expiration Date.
 
     Unit holders whose certificates for Units are not immediately available or
who cannot deliver their certificates and all other required documents to the
Depositary or complete the procedures for book-entry transfer prior to the
Expiration Date may tender their Units pursuant to the guaranteed delivery
procedures set forth in "THE TENDER OFFER -- 2. Procedures for Tendering Units"
of the Offer to Purchase. Pursuant to such procedures: (a) such tender must be
made by or through an Eligible Institution; (b) a properly completed and duly
executed Notice of Guaranteed Delivery, substantially in the form provided by
the Purchaser, must be received by the Depositary prior to the Expiration Date;
and (c) the certificates representing all tendered Units, in proper form for
tender, or Book-Entry Confirmation of a transfer into the Depositary's account
at a Book-Entry Transfer Facility of all Units delivered electronically, as well
as a properly completed and duly executed Letter of Transmittal (or facsimile
thereof), and any other documents required by this Letter of Transmittal, or an
Agent's Message in the case of a book-entry transfer, must be received by the
Depositary within three New York Stock Exchange ("NYSE") trading days after the
date of execution of such Notice of Guaranteed Delivery, all as provided in "THE
TENDER OFFER -- 2. Procedures for Tendering Units" of the Offer to Purchase. THE
METHOD OF DELIVERY OF UNITS, THIS LETTER OF TRANSMITTAL AND ANY OTHER REQUIRED
DOCUMENTS, INCLUDING DELIVERY THROUGH A BOOK-ENTRY TRANSFER FACILITY, IS AT THE
OPTION AND RISK OF THE TENDERING UNIT HOLDER. UNITS WILL BE DEEMED DELIVERED
ONLY WHEN ACTUALLY RECEIVED BY THE DEPOSITARY (INCLUDING, IN THE CASE OF A
BOOK-ENTRY TRANSFER, BY BOOK-ENTRY CONFIRMATION). IF DELIVERY IS BY MAIL,
REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY INSURED, IS RECOMMENDED.
IN ALL CASES, AMPLE TIME SHOULD BE ALLOWED FOR SUCH DOCUMENTS TO REACH THE
DEPOSITARY.
 
     No alternative, conditional or contingent tenders will be accepted, and no
fractional Units will be purchased. All tendering Unit holders, by execution of
this Letter of Transmittal (or facsimile thereof), waive any right to receive
any notice of the acceptance of their Units for payment.
<PAGE>   9
 
     3. INADEQUATE SPACE. If the space provided herein is inadequate, the
certificate numbers and/or the number of Units should be listed on a separate
signed schedule attached hereto.
 
     4. PARTIAL TENDERS (NOT APPLICABLE TO UNIT HOLDERS WHO TENDER BY BOOK-ENTRY
TRANSFER). If fewer than all the Units evidenced by any certificate submitted
are to be tendered, fill in the number of Units that are to be tendered in the
box entitled "Number of Units Tendered." In such a case, new certificate(s) for
the remainder of the Units that were evidenced by the old certificate(s) will be
sent to the person(s) signing this Letter of Transmittal, unless otherwise
provided in the appropriate box on this Letter of Transmittal, as soon as
practicable after the expiration of the Offer. All Units represented by
certificates delivered to the Depositary will be deemed to have been tendered
unless otherwise indicated.
 
     5. SIGNATURES ON LETTERS OF TRANSMITTAL; STOCK POWERS AND ENDORSEMENTS. If
this Letter of Transmittal is signed by the registered holder(s) of the Units
tendered hereby, the signature(s) must correspond with the name(s) as written on
the face of the certificate(s) without alteration, enlargement or any change
whatsoever.
 
     If any of the Units tendered hereby are owned of record by two or more
persons, all such owners must sign this Letter of Transmittal.
 
     If any tendered Units are registered in different names on several
certificates, it will be necessary to complete, sign and submit as many separate
Letters of Transmittal as there are different registrations of certificates.
 
     If this Letter of Transmittal or any certificates or stock powers are
signed by a trustee, executor, administrator, guardian, attorney-in-fact,
officer of a corporation or other person acting in a fiduciary or representative
capacity, such person should so indicate when signing, and proper evidence
satisfactory to the Purchaser of such authority so to act must be submitted.
 
     When this Letter of Transmittal is signed by the registered holder(s) of
Units listed and transmitted hereby, no endorsements of certificates or separate
stock powers are required unless payment is to be made to, or certificates for
Units not tendered or accepted for payment are to be issued to, a person other
than the registered holder(s). Signatures on such certificates or stock powers
must be guaranteed by an Eligible Institution.
 
     If this Letter of Transmittal is signed by a person other than the
registered holder(s) of certificates listed, the certificates must be endorsed
or accompanied by appropriate stock powers, in either case signed exactly as the
name or names of the registered owner or owners appear on the certificates.
Signatures on such certificates or stock powers must be guaranteed by an
Eligible Institution.
 
     6. STOCK TRANSFER TAXES. Except as set forth in this Instruction 6, the
Purchaser will pay any stock transfer taxes with respect to the transfer and
sale of Units to it, or to its order, pursuant to the Offer. If, however,
payment of the Purchase Price is to be made to, or if certificates for Units not
tendered or accepted for payment are to be registered in the name of, any person
other than the registered holder(s), or if tendered certificates are registered
in the name of any person other than the person(s) signing this Letter of
Transmittal, the amount of any stock transfer taxes (whether imposed on the
registered holder(s) or such other person or otherwise) payable on account of
the transfer to such person will be deducted from the Purchase Price unless
satisfactory evidence of the payment of such taxes, or exemption therefrom, is
submitted.
 
     EXCEPT AS PROVIDED IN THIS INSTRUCTION 6, IT WILL NOT BE NECESSARY FOR
TRANSFER TAX STAMPS TO BE AFFIXED TO THE CERTIFICATES LISTED IN THIS LETTER OF
TRANSMITTAL.
<PAGE>   10
 
     7. SPECIAL PAYMENT AND DELIVERY INSTRUCTIONS. If a check for the Purchase
Price of any Units purchased is to be issued, or any Units not tendered or not
purchased are to be returned, in the name of a person other than the person(s)
signing this Letter of Transmittal, or if the check or any certificates for
Units not tendered or not purchased are to be mailed to someone other than the
person(s) signing this Letter of Transmittal or to the person(s) signing this
Letter of Transmittal at an address other than that shown above, the appropriate
boxes on this Letter of Transmittal should be completed. Unit holders tendering
Units by book-entry transfer may request that Units not purchased be credited to
such account at a Book-Entry Transfer Facility as such Unit holder may designate
under "Special Payment Instructions." If no such instructions are given, any
such Units not purchased will be returned by crediting the account at the
Book-Entry Transfer Facility designated above.
 
     8. REQUEST FOR ASSISTANCE OR ADDITIONAL COPIES. Requests for assistance may
be directed to the Information Agent or the Dealer Manager at their respective
addresses set forth below. Additional copies of the Offer to Purchase, this
Letter of Transmittal and the Notice of Guaranteed Delivery may be obtained from
the Information Agent or the Dealer Manager at their respective addresses set
forth below or from your broker, dealer, commercial bank, trust company or other
nominee.
 
     9. WAIVER OF CONDITIONS. Subject to the applicable rules and regulations of
the Commission, the conditions of the Offer may be waived by the Purchaser, in
whole or in part, at any time and from time to time in the Purchaser's sole
discretion, in the case of any Units tendered.
 
     10. SUBSTITUTE FORM W-9. Each tendering Unit holder is required to provide
the Depositary with a correct Taxpayer Identification Number ("TIN") on the
Substitute Form W-9 that is provided under "Important Tax Information" below,
and to certify, under penalties of perjury, that such number is correct and that
such Unit holder is not subject to backup withholding of federal income tax. If
a tendering Unit holder has been notified by the Internal Revenue Service that
such Unit holder is subject to backup withholding, such Unit holder must cross
out item (2) of the Certification box of the Substitute Form W-9, unless such
Unit holder has since been notified by the Internal Revenue Service that such
Unit holder is no longer subject to backup withholding. Failure to provide the
information on the Substitute Form W-9 may subject the tendering Unit holder to
31% federal income tax withholding on the payment of the Purchase Price of all
Units purchased from such Unit holder. If the tendering Unit holder has not been
issued a TIN and has applied for one or intends to apply for one in the near
future, such Unit holder should write "Applied For" in the space provided for
the TIN in Part I of the Substitute Form W-9, sign and date the Substitute Form
W-9 and complete the Certificate of Awaiting Taxpayer Identification Number
below. Notwithstanding that "Applied For" is written in Part I and the
Certificate of Awaiting Taxpayer Identification Number is completed, the
Depositary will withhold 31% of all payments of the Purchase Price to such Unit
holder until a TIN is provided to the Depositary. Such amounts will be refunded
to such Unit holder if a TIN is provided to the Depositary within 60 days.
 
     IMPORTANT: THIS LETTER OF TRANSMITTAL OR A MANUALLY SIGNED FACSIMILE COPY
THEREOF (TOGETHER WITH CERTIFICATES FOR, OR A BOOK-ENTRY CONFIRMATION WITH
RESPECT TO, TENDERED UNITS WITH ANY REQUIRED SIGNATURE GUARANTEES AND ALL OTHER
REQUIRED DOCUMENTS) MUST BE RECEIVED BY THE DEPOSITARY, OR THE NOTICE OF
GUARANTEED DELIVERY MUST BE RECEIVED BY THE DEPOSITARY, PRIOR TO THE EXPIRATION
DATE.
 
                           IMPORTANT TAX INFORMATION
 
     Under the federal income tax law, a Unit holder whose tendered Units are
accepted for payment is required by law to provide the Depositary (as payer)
with such Unit holder's correct Taxpayer Identification Number ("TIN") on
Substitute Form W-9 below. If such Unit holder is an individual, the TIN is such
Unit holder's social security number. If the Depositary is not provided with the
correct TIN, the Unit holder may be subject to a $50 penalty imposed by the
Internal Revenue Service. In addition, payments that are made to such Unit
holder with respect to Units purchased pursuant to the Offer may be subject to
backup withholding at a rate of 31%.
<PAGE>   11
 
     Certain Unit holders (including, among others, all corporations and certain
foreign individuals) are not subject to these backup withholding and reporting
requirements. In order for a foreign individual to qualify as an exempt
recipient, such individual must submit a statement, signed under penalties of
perjury, attesting to such individual's exempt status. Forms of such statements
can be obtained from the Depositary. See the enclosed Guidelines for
Certification of Taxpayer Identification Number on Substitute Form W-9 for
additional instructions.
 
     If backup withholding applies, the Depositary is required to withhold 31%
of any payments made to the Unit holder. Backup withholding is not an additional
tax. Rather, the tax liability of persons subject to backup withholding will be
reduced by the amount of tax withheld. If withholding results in an overpayment
of taxes, a refund may be obtained from the Internal Revenue Service.
 
PURPOSE OF SUBSTITUTE FORM W-9
 
     To prevent backup withholding on payments that are made to a Unit holder
with respect to Units purchased pursuant to the Offer, the Unit holder is
required to notify the Depositary of such Unit holder's correct TIN by
completing the form below certifying (a) that the TIN provided on Substitute
Form W-9 is correct (or that such Unit holder is awaiting a TIN), and (b) that
such Unit holder is not subject to backup withholding because (i) such Unit
holder has not been notified by the Internal Revenue Service that such Unit
holder is subject to backup withholding as a result of a failure to report all
interest or dividends, (ii) the Internal Revenue Service has notified such Unit
holder that such Unit holder is no longer subject to backup withholding or (iii)
such Unit holder is exempt from backup withholding.
 
WHAT NUMBER TO GIVE THE DEPOSITARY
 
     The Unit holder is required to give the Depositary the social security
number or employer identification number of the record holder of the Units
tendered hereby. If the Units are in more than one name or are not in the name
of the actual owner, consult the enclosed Guidelines for Certification of
Taxpayer Identification Number on Substitute Form W-9 for additional guidance on
which number to report. If the tendering Unit holder has not been issued a TIN
and has applied for a number or intends to apply for a number in the near
future, the Unit holder should write "Applied For" in the space provided for the
TIN in Part I, sign and date the Substitute Form W-9 and complete the
Certificate of Awaiting Taxpayer Identification Number below. Notwithstanding
that "Applied For" is written in Part I and the Certificate of Awaiting Taxpayer
Identification Number is completed, the Depositary will withhold 31% of all
payments of the Purchase Price to such Unit holder until a TIN is provided to
the Depositary. Such amounts will be refunded to such Unit holder if a TIN is
provided to the Depositary within 60 days.
<PAGE>   12
 
                 PAYER'S NAME: HARRIS TRUST COMPANY OF NEW YORK
 
<TABLE>
<S>                                   <C>                                     <C>               <C>
- ------------------------------------------------------------------------------------------------------------------
 
                                       PART 1 -- Taxpayer Identification Num-
                                       ber -- For all accounts, enter
                                       taxpayer identification number in the
                                       box at right. (For most individuals,
                                       this is your social security number.     -------------------------------------
  SUBSTITUTE                           If you do not have a number, see                Social Security Number
  FORM W-9                             Obtaining a Number in the enclosed       OR ----------------------------------
                                       Guidelines.) Certify by signing and          Employer Identification Number
                                       dating below. Note: If the account is    (If awaiting TIN, write "Applied For")
                                       in more than one name, see the chart
                                       in the enclosed Guidelines to
                                       determine which number to give the
                                       payer.
                                      ------------------------------------------------------------------------------
                                       PART 2 -- For Payees Exempt From Backup Withholding, see the enclosed Guidelines
                                       and complete as instructed therein.
                                      ------------------------------------------------------------------------------
 
                                       CERTIFICATION -- Under penalties of perjury, I certify that:
                                       (1) The number shown on this form is my correct Taxpayer Identification Number
                                           (or a Taxpayer Identification Number has not been issued to me and either (a) I
                                           have mailed or delivered an application to receive a Taxpayer Identification
                                           Number to the appropriate Internal Revenue Service Center ("IRS") or Social
                                           Security Administration Office or (b) I intend to mail or deliver an
                                           application in the near future. I understand that, notwithstanding that I
                                           have written "Applied For" in Part 1 and have completed the Certificate of
                                           Awaiting Taxpayer Identification Number, 31% of all reportable payments made
                                           to me thereafter will be withheld until I provide a correct Taxpayer
                                           Identification Number), and
                                       (2) I am not subject to backup withholding either because (a) I am exempt from
  DEPARTMENT OF THE TREASURY               backup withholding, (b) I have not been notified by the IRS that I am subject
  INTERNAL REVENUE SERVICE                 to backup withholding as a result of failure to report all interest or
                                           dividends, or (c) the IRS has notified me that I am no longer subject to
  PAYER'S REQUEST FOR TAXPAYER             backup withholding.
  IDENTIFICATION NUMBER
  ("TIN")                              CERTIFICATE INSTRUCTIONS -- You must cross out item (2) above if you have been
                                       notified by the IRS that you are subject to backup withholding because of
                                       under-reporting interest or dividends on your tax return. However, if after
                                       being notified by the IRS that you were subject to backup withholding you
                                       received another notification from the IRS that you are no longer subject to
                                       backup withholding, do not cross out item (2). (Also see instructions in the
                                       enclosed Guidelines.)

                                       Signature:                                        Date:
                                                 -------------------------------------        ----------------------

- --------------------------------------------------------------------------------------------------------------------
</TABLE>
 
NOTE:  FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP WITHHOLDING
       OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER. PLEASE REVIEW
       THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
       NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.
- --------------------------------------------------------------------------------
 
             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
 
        I certify under penalties of perjury that a taxpayer identification
   number has not been issued to me, and either (1) I have mailed or
   delivered an application to receive a taxpayer identification number to
   the appropriate Internal Revenue Service Center or Social Security
   Administration Office or (2) I intend to mail or deliver an application in
   the near future. I understand that, notwithstanding that I have written
   "Applied For" in Part 1 and have completed the certificate of awaiting
   taxpayer identification number, 31% of all reportable payments made to me
   prior to the time I provide a properly certified taxpayer identification
   number will be withheld.
 
   Signature:                                                Date:
             ------------------------------------------           -------------

- --------------------------------------------------------------------------------
<PAGE>   13
 
     Questions and requests for assistance or additional copies of the Offer to
Purchase, this Letter of Transmittal and other tender offer materials may be
directed to the Information Agent or the Dealer Manager as set forth below.
 
                    THE INFORMATION AGENT FOR THE OFFER IS:
 
                                D.F. KING & CO.
                                77 WATER STREET
                            NEW YORK, NEW YORK 10005
                            TOLL FREE (800) 431-9642
 
                      THE DEALER MANAGER FOR THE OFFER IS:
 
                              SALOMON SMITH BARNEY
                            SEVEN WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
                                 (212) 783-8527

<PAGE>   1
 
                         NOTICE OF GUARANTEED DELIVERY
                                      FOR
                     TENDER OF UNITS OF BENEFICIAL INTEREST
                                       OF
 
                              BURLINGTON RESOURCES
                          COAL SEAM GAS ROYALTY TRUST
 
     As set forth in the "THE TENDER OFFER -- 2. Procedures for Tendering Units"
of the Offer to Purchase (as defined below), this Notice of Guaranteed Delivery,
or one substantially equivalent hereto, must be used to accept the Offer (as
defined below) if certificates representing Units of Beneficial Interest (the
"Units") of Burlington Resources Coal Seam Gas Royalty Trust, a Delaware
business trust (the "Trust"), are not immediately available or if the procedures
for book-entry transfer cannot be completed on a timely basis or time will not
permit all required documents to reach the Depositary prior to the Expiration
Date (as defined in "THE TENDER OFFER -- 1. Terms of the Offer" of the Offer to
Purchase). This Notice of Guaranteed Delivery may be delivered by hand or
transmitted by telegram or facsimile transmission or mailed to the Depositary
and must include a guarantee by an Eligible Institution (as defined in "THE
TENDER OFFER -- 2. Procedures for Tendering Units" of the Offer to Purchase).
See "THE TENDER OFFER -- 2. Procedures for Tendering Units" of the Offer to
Purchase.
 
                        The Depositary for the Offer is:
 
                        HARRIS TRUST COMPANY OF NEW YORK
 
<TABLE>
<C>                             <C>                             <C>
    By Hand Delivery or           Facsimile Transmission:                 By Mail:
         Overnight:
 
       88 Pine Street                  (212) 701-7636               Wall Street Station
         19th Floor                    (212) 701-7637                  P.O. Box 1023
     New York, NY 10005                                           New York, NY 10268-1023
                            (For Eligible Institutions Only)
                                   Confirm by Telephone:
                                       (212) 701-7624
</TABLE>
 
                             ---------------------
 
     DELIVERY OF THIS INSTRUMENT TO AN ADDRESS, OR TRANSMISSION OF INSTRUCTIONS
VIA FACSIMILE NUMBER, OTHER THAN AS SET FORTH ABOVE DOES NOT CONSTITUTE A VALID
DELIVERY.
 
     THIS NOTICE OF GUARANTEED DELIVERY IS NOT TO BE USED TO GUARANTEE
SIGNATURES. IF A SIGNATURE ON A LETTER OF TRANSMITTAL IS REQUIRED TO BE
GUARANTEED BY AN ELIGIBLE INSTITUTION UNDER THE INSTRUCTIONS THERETO, SUCH
SIGNATURE GUARANTEE MUST APPEAR IN THE APPLICABLE SPACE PROVIDED IN THE
SIGNATURE BOX ON THE LETTER OF TRANSMITTAL.
 
     THE ELIGIBLE INSTITUTION THAT COMPLETES THIS FORM MUST COMMUNICATE THE
GUARANTEE TO THE DEPOSITARY AND MUST DELIVER THE LETTER OF TRANSMITTAL AND
CERTIFICATES FOR THE UNITS TO THE DEPOSITARY WITHIN THE TIME PERIOD SHOWN
HEREIN. FAILURE TO DO SO COULD RESULT IN A FINANCIAL LOSS TO SUCH ELIGIBLE
INSTITUTION.
<PAGE>   2
 
Ladies and Gentlemen:
 
     The undersigned hereby tenders to Devon Acquisition Corporation, a Delaware
corporation (the "Purchaser"), upon the terms and subject to the conditions set
forth in the Purchaser's Offer to Purchase dated February 13, 1998, as amended
from time to time (the "Offer to Purchase") and in the related Letter of
Transmittal (which, together with any amendments or supplements thereto,
collectively constitute the "Offer"), receipt of which is hereby acknowledged,
the number of Units shown below pursuant to the guaranteed delivery procedures
set forth in "THE TENDER OFFER -- 2. Procedures for Tendering Units" of the
Offer to Purchase.
 
<TABLE>
<S>                                                    <C>
Number of Units                                        Name(s) of Record Holder(s)
 
- -----------------------------------------------------  -----------------------------------------------------
 
                                                       -----------------------------------------------------
                                                                      (Please Type or Print)
 
Certificate Nos. For Units (if available)              Address(es) ----------------------------------------
 
- -----------------------------------------------------  -----------------------------------------------------
                                                                       (Including Zip Code)
 
- -----------------------------------------------------  -----------------------------------------------------
                                                                 Area Code and Telephone Number(s)
 
Complete if Units will be tendered by book-entry:      Sign Here
 
[ ] The Depository Trust Company                       -----------------------------------------------------
 
[ ] Philadelphia Depository Trust Company              -----------------------------------------------------
                                                                           Signature(s)
 
Account Number ----------------------------------
 
                                                                     Dated ------------ , 1998
</TABLE>
 
              THE GUARANTEE ON THE REVERSE SIDE MUST BE COMPLETED
 
                                        2
<PAGE>   3
 
               GUARANTEE (NOT TO BE USED FOR SIGNATURE GUARANTEE)
 
     The undersigned, a bank, broker, dealer, credit union, savings association
or other entity which is a member in good standing of the Securities Transfer
Agent's Medallion Program, hereby guarantees to deliver to the Depositary either
the certificates representing the Units tendered hereby, in proper form for
transfer, or a Book-Entry Confirmation (as defined in "THE TENDER OFFER -- 2.
Procedures for Tendering Units" of the Offer to Purchase) of a transfer of such
Units, in any such case together with a properly completed and duly executed
Letter of Transmittal, or a manually signed facsimile thereof, with any required
signature guarantees, or an Agent's Message, and any other documents required by
the Letter of Transmittal within three New York Stock Exchange, Inc. trading
days after the date hereof.
 
     The Eligible Institution that completes this form must communicate the
guarantee to the Depositary and must deliver the Letter of Transmittal and
certificates for Units to the Depositary within the time period shown herein.
Failure to do so could result in a financial loss to such Eligible Institution.
 
<TABLE>
<C>                                                    <C>
- -----------------------------------------------------  -----------------------------------------------------
                   (Name of Firm)                                            (Address)
 
- -----------------------------------------------------  -----------------------------------------------------
          (Area Code and Telephone Number)                            (Authorized Signature)
 
                                                       -----------------------------------------------------
                                                                              (Name)
 
Dated: ----------------------------------------, 1998  -----------------------------------------------------
                                                                              (Title)
</TABLE>
 
           NOTE: DO NOT SEND CERTIFICATES FOR UNITS WITH THIS NOTICE.
       UNIT CERTIFICATES SHOULD BE SENT WITH YOUR LETTER OF TRANSMITTAL.
 
                                        3

<PAGE>   1
 
                           OFFER TO PURCHASE FOR CASH
                    ANY AND ALL UNITS OF BENEFICIAL INTEREST
                                       OF
 
                              BURLINGTON RESOURCES
                          COAL SEAM GAS ROYALTY TRUST
                                       AT
                               $8.75 NET PER UNIT
                                       BY
 
                         DEVON ACQUISITION CORPORATION
                          A WHOLLY-OWNED SUBSIDIARY OF
 
                            DEVON ENERGY CORPORATION
 
                      THE OFFER AND WITHDRAWAL RIGHTS WILL
            EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON FRIDAY,
                  MARCH 13, 1998, UNLESS THE OFFER IS EXTENDED
 
                                                               February 13, 1998
 
To Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees:
 
     Smith Barney Inc. (now associated with Salomon Brothers Inc and
collectively with Salomon Brothers Inc doing business as Salomon Smith Barney)
is acting as Dealer Manager for Devon Acquisition Corporation, a Delaware
corporation (the "Purchaser") and a wholly-owned subsidiary of Devon Energy
Corporation ("Devon"), pursuant to the Purchaser's offer to purchase any and all
Units of Beneficial Interest (the "Units") of Burlington Resources Coal Seam Gas
Royalty Trust, a Delaware business trust (the "Trust"), at $8.75 per Unit, net
to the seller in cash, upon the terms and subject to the conditions set forth in
the Purchaser's Offer to Purchase dated February 13, 1998, as amended from time
to time (the "Offer to Purchase"), and the related Letter of Transmittal (which,
together with any supplements or amendments thereto, collectively constitute the
"Offer").
 
     THE OFFER IS SUBJECT TO THE TERMS AND CONDITIONS THAT ARE CONTAINED IN "THE
TENDER OFFER -- 14. CERTAIN CONDITIONS OF THE OFFER" OF THE OFFER TO PURCHASE.
 
     Please furnish copies of the enclosed materials to those of your clients
for whom you hold Units registered in your name or in the name of your nominee.
Enclosed herewith for your information and forwarding to your clients are copies
of the following documents:
 
        1. Offer to Purchase, dated February 13, 1998;
 
        2. Letter of Transmittal to tender Units for your use and for the
           information of your clients. Facsimile copies of the Letter of
           Transmittal (with manual signatures) may be used to tender Units;
 
        3. A printed form of letter that may be sent to your clients for whose
           account you hold Units in your name or in the name of a nominee,
           including an instruction form for obtaining such client's
           instructions with regard to the Offer;
 
        4. Notice of Guaranteed Delivery for Units to be used to accept the
           Offer if certificates for Units are not immediately available or if
           such certificates and all other required documents cannot be
           delivered to Harris Trust Company of New York, as Depositary (the
           "Depositary") on or prior to
<PAGE>   2
 
           the Expiration Date or if the procedure for book-entry transfer
           cannot be completed on a timely basis on or prior to the Expiration
           Date;
 
        5. Guidelines of the Internal Revenue Service for Certification of
           Taxpayer Identification Number on Substitute Form W-9; and
 
        6. Return envelope addressed to the Depositary.
 
     YOUR PROMPT ACTION IS REQUESTED. WE URGE YOU TO CONTACT YOUR CLIENTS AS
PROMPTLY AS POSSIBLE. PLEASE NOTE THAT THE OFFER AND WITHDRAWAL RIGHTS WILL
EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON FRIDAY, MARCH 13, 1998, UNLESS
EXTENDED.
 
     Subject to the applicable rules of the Securities and Exchange Commission
(the "Commission"), the Purchaser expressly reserves the right, in its sole
discretion, at any time or from time to time and regardless of whether or not
any of the events set forth in "THE TENDER OFFER -- 14. Certain Conditions of
the Offer" of the Offer to Purchase shall have occurred or shall have been
determined by the Purchaser to have occurred, (i) to extend the period of time
during which the Offer is open and thereby delay acceptance for payment of, and
the payment for, all Units validly tendered by giving oral or written notice of
such extension to the Depositary and (ii) to amend the Offer in any respect, by
giving oral or written notice of such extension or amendment to the Depositary.
These rights reserved by the Purchaser are in addition to the Purchaser's rights
to terminate the Offer pursuant to "THE TENDER OFFER -- 14. Certain Conditions
of the Offer" of the Offer to Purchase. UNDER NO CIRCUMSTANCES WILL INTEREST BE
PAID ON THE PURCHASE PRICE FOR TENDERED UNITS, WHETHER OR NOT THE PURCHASER
EXERCISES ITS RIGHTS TO EXTEND THE OFFER.
 
     Subject to the applicable rules of the Commission, if any or all of the
conditions set forth in "THE TENDER OFFER -- 14. Certain Conditions of the
Offer" of the Offer to Purchase are not satisfied prior to the Expiration Date,
the Purchaser reserves the right (but shall not be obligated) in its sole
discretion to (i) decline to purchase any of the Units tendered in the Offer,
terminate the Offer and return all tendered Units to the tendering Unit holders,
(ii) waive or amend any or all of the conditions to the Offer to the extent
permitted by applicable law and, subject to complying with applicable rules and
regulations of the Commission, purchase all Units validly tendered, (iii) extend
the Offer and, subject to the right of the Unit holders to withdraw Units until
the Expiration Date, retain the Units that have been tendered during the period
or periods for which the Offer is extended or (iv) amend the Offer.
 
     In order to take advantage of the Offer, (i) a duly executed and properly
completed Letter of Transmittal (or facsimile thereof) and any required
signature guarantees, or an Agent's Message (as defined in the Offer to
Purchase) in connection with a book-entry delivery of Units, and any other
required documents should be sent to the Depositary, and (ii) either
certificates for Units should be delivered to the Depositary, or such Units
should be tendered by book-entry transfer into the Depositary's account
maintained at the Book-Entry Transfer Facility (as described in the Offer to
Purchase), all in accordance with the instructions set forth in the Letter of
Transmittal and the Offer to Purchase.
 
     If holders of Units wish to tender, but it is impracticable for them to
forward their certificates for Units or other required documents on or prior to
the Expiration Date or to comply with the book-entry transfer procedures on a
timely basis, a tender may be effected by following the guaranteed delivery
procedures specified in "THE TENDER OFFER -- 2. Procedures for Tendering Units"
of the Offer to Purchase.
 
     The Purchaser will not pay any fees or commissions to any broker, dealer or
any other person for soliciting tenders of Units pursuant to the Offer (other
than to the Dealer Manager and to the Information Agent). The Purchaser will,
however, upon request, reimburse you for customary mailing and handling expenses
incurred by you in forwarding any of the enclosed materials to your customers.
The Purchaser will pay or cause to be paid any stock transfer taxes payable on
the transfer of Units to it, except as otherwise provided in Instruction 6 of
the Letter of Transmittal.
 
                                        2
<PAGE>   3
 
     Each Unit holder should make his own determination as to whether to tender
Units pursuant to the Offer. Holders of Units should read the Offer to Purchase
carefully before making any decision with regard to the Offer.
 
     Questions and requests for additional copies of the enclosed material may
be directed to the Information Agent or to the Dealer Manager at their
respective addresses and telephone numbers set forth on the back cover of the
enclosed Offer to Purchase.
 
                                            Very truly yours,
 
                                            SALOMON SMITH BARNEY
 
     NOTHING CONTAINED HEREIN OR IN THE ENCLOSED DOCUMENTS SHALL RENDER YOU OR
ANY OTHER PERSON THE AGENT OF DEVON, THE PURCHASER, THE DEPOSITARY, THE
INFORMATION AGENT, THE DEALER MANAGER OR ANY AFFILIATE OF ANY OF THE FOREGOING,
OR AUTHORIZE YOU OR ANY OTHER PERSON TO GIVE ANY INFORMATION OR USE ANY DOCUMENT
OR MAKE ANY STATEMENTS ON BEHALF OF ANY OF THEM WITH RESPECT TO THE OFFER OTHER
THAN THE ENCLOSED DOCUMENTS AND THE STATEMENTS CONTAINED THEREIN.
 
                                        3

<PAGE>   1
 
                           OFFER TO PURCHASE FOR CASH
                  ANY AND ALL UNITS OF BENEFICIAL INTEREST OF
 
                              BURLINGTON RESOURCES
                          COAL SEAM GAS ROYALTY TRUST
                                       AT
                               $8.75 NET PER UNIT
                                       BY
 
                         DEVON ACQUISITION CORPORATION,
                          A WHOLLY-OWNED SUBSIDIARY OF
 
                            DEVON ENERGY CORPORATION
 
                      THE OFFER AND WITHDRAWAL RIGHTS WILL
            EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON FRIDAY,
                  MARCH 13, 1998, UNLESS THE OFFER IS EXTENDED
 
                                                               February 13, 1998
 
To Our Clients:
 
     Enclosed for your consideration is an Offer to Purchase dated February 13,
1998, as amended from time to time (the "Offer to Purchase") and a related
Letter of Transmittal (which, together with any amendments or supplements
thereto, collectively constitute the "Offer") relating to the offer by Devon
Acquisition Corporation, a Delaware corporation (the "Purchaser"), to purchase
any and all Units of Beneficial Interest (the "Units") of Burlington Resources
Coal Seam Gas Royalty Trust, a Delaware business trust (the "Trust"), at $8.75
per Unit, net to the seller in cash, without interest, upon the terms and
subject to the conditions set forth in the Offer. This material is being
forwarded to you as the beneficial owner of Units carried by us in your account
but not registered in your name.
 
     WE ARE THE HOLDER OF RECORD OF UNITS HELD BY US FOR YOUR ACCOUNT. A TENDER
OF SUCH UNITS CAN BE MADE ONLY BY US AS THE HOLDER OF RECORD AND PURSUANT TO
YOUR INSTRUCTIONS. THE LETTER OF TRANSMITTAL IS FURNISHED TO YOU FOR YOUR
INFORMATION ONLY AND CANNOT BE USED TO TENDER UNITS HELD BY US FOR YOUR ACCOUNT.
 
     Accordingly, we request instructions as to whether you wish to tender any
or all of the Units held by us for your account, pursuant to the terms and
conditions set forth in the Offer.
 
     Your attention is invited to the following:
 
        1. The tender price is $8.75 per Unit, net to the seller in cash,
           without interest, upon the terms and subject to the conditions set
           forth in the Offer.
 
        2. The Offer is being made for any and all Units.
 
        3. THE OFFER IS SUBJECT TO THE TERMS AND CONDITIONS THAT ARE CONTAINED
           IN "THE TENDER OFFER -- 14. CERTAIN CONDITIONS OF THE OFFER" OF THE
           OFFER TO PURCHASE.
 
        4. Each Unit holder should make his or her own determination as to
           whether to tender Units pursuant to the Offer. Holders of Units
           should read the Offer to Purchase carefully before making any
           decision with regard to the Offer.
<PAGE>   2
 
          5. THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW
     YORK CITY TIME, ON FRIDAY, MARCH 13, 1998, UNLESS EXTENDED.
 
          6. Tendering Unit holders will not be obligated to pay brokerage fees
     or commissions or, except as set forth in Instruction 6 of the Letter of
     Transmittal, stock transfer taxes on the transfer of Units pursuant to the
     Offer.
 
     Subject to the applicable rules of the Securities and Exchange Commission
(the "Commission"), the Purchaser expressly reserves the right, in its sole
discretion, at any time or from time to time and regardless of whether or not
any of the events set forth in "THE TENDER OFFER -- 14. Certain Conditions of
the Offer" of the Offer to Purchase shall have occurred or shall have been
determined by the Purchaser to have occurred, (i) to extend the period of time
during which the Offer is open and thereby delay acceptance for payment of, and
the payment for, all Units validly tendered by giving oral or written notice of
such extension to the Depositary and (ii) to amend the Offer in any respect, by
giving oral or written notice of such extension or amendment to the Depositary.
These rights reserved by the Purchaser are in addition to the Purchaser's rights
to terminate the Offer pursuant to "THE TENDER OFFER -- 14. Certain Conditions
of the Offer" of the Offer to Purchase. UNDER NO CIRCUMSTANCES WILL INTEREST BE
PAID ON THE PURCHASE PRICE FOR TENDERED UNITS, WHETHER OR NOT THE PURCHASER
EXERCISES ITS RIGHTS TO EXTEND THE OFFER.
 
     Subject to the applicable rules of the Commission, if any or all of the
conditions set forth in "THE TENDER OFFER -- 14. Certain Conditions of the
Offer" of the Offer to Purchase are not satisfied prior to the Expiration Date,
the Purchaser reserves the right (but shall not be obligated) in its sole
discretion to (i) decline to purchase any of the Units tendered in the Offer,
terminate the Offer and return all tendered Units to the tendering Unit holders,
(ii) waive or amend any or all of the conditions to the Offer to the extent
permitted by applicable law and, subject to complying with applicable rules and
regulations of the Commission, purchase all Units validly tendered, (iii) extend
the Offer and, subject to the right of the Unit holders to withdraw Units until
the Expiration Date, retain the Units that have been tendered during the period
or periods for which the Offer is extended or (iv) amend the Offer.
 
     If you wish to have us tender any of or all of your Units, please so
instruct us by completing, executing, detaching and returning to us the
instruction form set forth below. An envelope to return your instructions to us
is enclosed. If you authorize tender of your Units, all such Units will be
tendered unless otherwise specified below. PLEASE FORWARD YOUR INSTRUCTIONS TO
US AS SOON AS POSSIBLE TO ALLOW US AMPLE TIME TO TENDER YOUR UNITS ON YOUR
BEHALF PRIOR TO THE EXPIRATION OF THE OFFER.
 
     The Offer is made solely pursuant to the Offer to Purchase and the related
Letter of Transmittal, and any supplements or amendments thereto. The Offer is
not being made to (nor will tenders be accepted from or on behalf of) holders of
Units residing in any jurisdiction in which the making of the Offer or the
acceptance thereof would not be in compliance with the securities, blue sky or
other laws of such jurisdiction. In any jurisdiction where the securities, blue
sky or other laws require the Offer to be made by a licensed broker or dealer,
the Offer will be deemed to be made on behalf of the Purchaser by one or more
registered brokers or dealers licensed under the laws of such jurisdiction.
 
     For purposes of the Offer, the Purchaser will be deemed to have accepted
for payment (and thereby purchased) Units validly tendered and not withdrawn as,
if and when the Purchaser gives oral or written notice to the Depositary of the
Purchaser's acceptance of such Units for payment pursuant to the Offer. Upon the
terms and subject to the conditions of the Offer, payment for Units purchased
pursuant to the Offer will be made by deposit of the Purchase Price therefor
with the Depositary, which will act as agent for tendering Unit holders for the
purpose of receiving payment from the Purchaser and transmitting payment to
tendering Unit holders. Under no circumstances will interest on the Purchase
Price be paid by the Purchaser by reason of any delay in making such payment. In
all cases, payment for Units purchased pursuant to the Offer will be made only
after timely receipt by the Depositary of (i) certificates for such Units or
timely confirmation of a book-entry transfer of such Units into the Depositary's
account at the Book-Entry Transfer Facility (as
 
                                        2
<PAGE>   3
 
defined in the Offer to Purchase) pursuant to the procedures set forth in "THE
TENDER OFFER -- 2. Procedures for Tendering Units" of the Offer to Purchase,
(ii) the Letter of Transmittal (or facsimile thereof), properly completed and
duly executed, with any required signature guarantees, or an Agent's Message (as
defined in the Offer to Purchase) in connection with a book-entry transfer, and
(iii) any other documents required by the Letter of Transmittal.
 
Tear Here                                                              Tear Here
 
 ................................................................................
 
INSTRUCTIONS WITH RESPECT TO THE OFFER TO PURCHASE FOR CASH ANY AND ALL UNITS OF
BENEFICIAL INTEREST OF BURLINGTON RESOURCES COAL SEAM GAS ROYALTY TRUST AT $8.75
NET PER UNIT
 
     The undersigned acknowledges receipt of your letter enclosing the Offer to
Purchase dated February 13, 1998, as amended from time to time of Devon
Acquisition Corporation, a Delaware corporation, and the related Letter of
Transmittal, relating to Units of Beneficial Interest (the "Units") of
Burlington Resources Coal Seam Gas Royalty Trust, a Delaware business trust.
 
     You are instructed to tender the number of Units indicated below (or, if no
number is indicated below, all Units) held by you for the account of the
undersigned, upon the terms and conditions set forth in such Offer to Purchase
and the related Letter of Transmittal.
 
<TABLE>
<S>                                                    <C>
Number of Units to be Tendered*                        Sign Here

- ----------------------------------------------- Units  -----------------------------------------------------
 
                                                       -----------------------------------------------------
                                                                               Signature(s)
 
                                                       Name(s) ---------------------------------------------

                                                       -----------------------------------------------------
                                                                          (Please print name(s)
 
                                                       Address(es) -----------------------------------------

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

                                                       -----------------------------------------------------
                                                                         (Include Zip Code)
 
Dated: ------------ , 1998                             Area Code and Telephone Number(s)

                                                       ---------------  ------------------------------------
 
                                                       Tax Identification or Social Security Number(s)

                                                       -----------------------------------------------------
</TABLE>
 
* Unless otherwise indicated, it will be assumed that all your Units are to be
  tendered.
 
                                        3

<PAGE>   1
   GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION NUMBER ON FORM W-9

<TABLE>
<S>                                      <C>                                                    <C>
Form W-9
(Rev. January 1993)                                                                             
                                         REQUEST FOR TAXPAYER                                   GIVE THIS FORM TO
Department of the Treasury               IDENTIFICATION NUMBER AND CERTIFICATION                THE REQUESTER DO
Internal Revenue Service                                                                        NOT SEND TO IRS.
- ------------------------------------------------------------------------------------------------------------------
      Name (if joint names, list first and circle the name of the person or entity whose number you enter in Part
       1 below. SEE INSTRUCTIONS ON PAGE 2 IF YOUR NAME HAS CHANGED.)

   ---------------------------------------------------------------------------------------------------------------
      Business name (Sole proprietors SEE instructions on page 2). (IF YOU ARE EXEMPT FROM BACKUP WITHHOLDING,
      COMPLETE THIS FORM AND ENTER "EXEMPT" IN PART II BELOW.)

   ---------------------------------------------------------------------------------------------------------------
      Address (number and street)                                                           List account
                                                                                            numbers(s) here
   --------------------------------------------------------------------------------------   (optional)
      City, state, and ZIP code
                               
- ------------------------------------------------------------------------------------------------------------------
PART 1     TAXPAYER IDENTIFICATION NUMBER (TIN)
- ------------------------------------------------------------------------------------------------------------------
 
  Enter your TIN in the appropriate box. For          Social Security number       PART II   For Payees Exempt
  individuals, this is your social security number          -      -                         From Backup Withholding
  (SSN). For sole proprietors, see the instructions   ---------------------------            (See Exempt Payees and
  on page 2. For other entities, it is your employer                                         Payments on page 2)
  identification number (EIN). If you do not have a              OR
  number, see HOW TO OBTAIN A TIN below.                                           ---------------------------------
                                                                                          Requester's name and
  NOTE:  If the account is in more than one name,     Employee identification numbe       address (optional)
  see the chart on page 2 for guidelines on whose           -                                                        
  number to enter.                                    -----------------------------    
- ------------------------------------------------------------------------------------------------------------------
</TABLE>
 
CERTIFICATION.-- Under penalties of perjury, I certify that:
 
1. The number shown on this form is my correct taxpayer identification number
   (or I am waiting for a number to be issued to me), and
 
2. I am not subject to backup withholding because: (a) I am exempt from backup
   withholding, or (b) I have not been notified by the Internal Revenue Service
   that I am subject to backup withholding as a result of a failure to report
   all interest or dividends, or (c) the IRS has notified me that I am no longer
   subject to backup withholding.
 
CERTIFICATION INSTRUCTIONS.-- You must cross out item 2 above if you have been
notified by the IRS that you are currently subject to backup withholding because
of underreporting interest or dividends on your tax return. For real estate
transactions, item 2 does not apply. For mortgage interest paid, the acquisition
or abandonment of secured property, contributions to an individual retirement
arrangement (IRA), and generally payments other than interest and dividends, you
are not required to sign the Certification, but you must provide your correct
TIN. (Also see SIGNING THE CERTIFICATION on page 2).
 
<TABLE>
<S>       <C>                              <C>                         <C>
- --------------------------------------------------------------------------------------
SIGN
HERE      SIGNATURE ,                      SAMPLE                         DATE ,

- --------------------------------------------------------------------------------------
</TABLE>
 
Section references are to the Internal Revenue Code.
 
PURPOSE OF FORM.-- A person who is required to file an information return with
the IRS must obtain your correct TIN to report income paid to you, real estate
transactions, mortgage interest you paid, the acquisition or abandonment of
secured property, or contributions you made to an IRA. Use Form W-9 to furnish
your correct TIN to the requester (the person asking you to furnish your TIN)
and, when applicable, (1) to certify that the TIN you are furnishing is correct
(or that you are waiting for a number to be issued), (2) to certify that you are
not subject to backup withholding, and (3) to claim exemption from backup
withholding if you are an exempt payee. Furnishing your correct TIN and making
the appropriate certifications will prevent certain payments from being subject
to backup withholding.
 
NOTE: If a requester gives you a form other than a W-9 to request your TIN, you
must use the requester's form.
 
HOW TO OBTAIN A TIN.-- If you do not have a TIN, apply for one immediately. To
apply, get FORM SS-5, Application for a Social Security Card (for individuals),
from your local office of the Social Security Administration, or FORM SS-4,
Application for Employer Identification Number (for businesses and all other
entities), from your local IRS office.
 
 To complete Form W-9 if you do not have a TIN, write "Applied for" in the space
for the TIN in Part 1, sign and date the form, and give it to the requester.
Generally, you will then have 60 days to obtain a TIN and furnish it to the
requester. If the requester does not receive your TIN within 60 days, backup
withholding, if applicable, will begin and continue until you furnish your TIN
to the requester. For reportable interest or dividend payments, the payer must
exercise one of the following options concerning backup withholding during this
60-day period. Under option (1), a payer must backup withhold on any withdrawals
you make from your account after 7 business days after the requester receives
this form back from you. Under option (2), the payer must backup withhold on any
reportable interest or dividend payments made to your account, regardless of
whether you make any withdrawals. The backup withholding under option (2) must
begin no later than 7 business days after the requester receives this form back.
Under option (2), the payer is required to refund the amounts withheld if your
certified TIN is received within the 60-day period and you were not subject to
backup withholding during that period.
 
NOTE: Writing "Applied for" on the form means that you have already applied for
a TIN OR that you intend to apply for one in the future.
 
 As soon as you receive your TIN, complete another Form W-9, include your TIN,
sign and date the form, and give it to the requester.
 
WHAT IS BACKUP WITHHOLDING?-- Persons making certain payments to you after 1992
are required to withhold and pay to the IRS 31% of such payments under certain
conditions. This is called "backup withholding." Payments that could be subject
to backup withholding include interest, dividends, broker and barter exchange
transactions, rents, royalties, nonemployee compensation, and certain payments
from fishing boat operators, but do not include real estate transactions.
 
 If you give the requester your correct TIN, make the appropriate
certifications, and report all your taxable interest and dividends on your tax
return, your payments will not be subject to backup withholding. Payments you
receive will be subject to backup withholding if:
 
 1. You do not furnish your TIN to the requester, or
 
 2. The IRS notifies the requester that you furnished an incorrect TIN, or
 
 3. You are notified by the IRS that you are subject to backup withholding
because you failed to report all your interest and dividends on your tax return
(for reportable interest and dividends only), or
 
 4. You do not certify to the requester that you are not subject to backup
withholding under 3 above (for reportable interest and dividend accounts opened
after 1983 only), or
 
 5. You do not certify your TIN. This applies only to reportable interest,
dividend, broker, or barter exchange accounts opened after 1983, or broker
accounts considered inactive in 1983.
 
 Except as explained in 5 above, other reportable payments are subject to backup
withholding only if 1 or 2 above applies. Certain payees and payments are exempt
from backup withholding and information reporting. See PAYEES AND PAYMENTS
EXEMPT FROM
 
- --------------------------------------------------------------------------------
1/11/93                   Cat. No. 10231X                   Form W-9 (Rev. 1-93)
<PAGE>   2
 
Form W-9 (Rev. 1-93)                                                      Page 2
- --------------------------------------------------------------------------------
 
BACKUP WITHHOLDING, below, and Exempt PAYEES AND PAYMENTS under Specific
Instructions, below, if you are an exempt payee.
 
PAYEES AND PAYMENTS EXEMPT FROM BACKUP WITHHOLDING.-- The following is a list of
payees exempt from backup withholding and for which no information reporting is
required. For interest and dividends, all listed payees are exempt except item
(9). For broker transactions, payees listed in (1) through (13) and a person
registered under the Investment Advisers Act of 1940 who regularly acts as a
broker are exempt. Payments subject to reporting under sections 6041 and 6041A
are generally exempt from backup withholding only if made to payees described in
items (1) through (7), except a corporation that provides medical and health
care services or bills and collects payments for such services is not exempt
from backup withholding or information reporting. Only payees described in items
(2) through (6) are exempt from backup withholding for barter exchange
transactions, patronage dividends, and payments by certain fishing boat
operators.
 
 (1) A corporation. (2) An organization exempt from tax under section 501(a), or
an IRA or a custodial account under section 403(b)(7). (3) The United States or
any of its agencies or instrumentalities. (4) A state, the District of Columbia,
a possession of the United States, or any of their political subdivisions or
instrumentalities. (5) A foreign government or any of its political
subdivisions, agencies, or instrumentalities. (7) A foreign central bank of
issue. (8) A dealer in securities or commodities required to register in the
United States or a possession of the United States. (9) A futures commission
merchant registered with the Commodity Futures Trading Commission. (10) A real
estate investment trust. (11) An entity registered at all times during the tax
year under the Investment Company Act of 1940. (12) A common trust fund operated
by a bank under section 584(a). (13) A financial institution. (14) A middleman
known in the investment community as a nominee or listed in the most recent
publication of the American Society of Corporate Secretaries, Inc., Nominee
List. (15) A trust exempt from tax under section 664 or described in section
4947.
 
 Payments of dividends and patronage dividends generally not subject to backup
withholding include the following:
 
- - Payments to nonresident aliens subject to withholding under section 1441.
 
- - Payments to partnerships not engaged in a trade or business in the United
States and that have at least one nonresident partner.
 
- - Payments of patronage dividends not paid in money.
 
- - Payments made by certain foreign organizations.
 
 Payments of Interest generally not subject to backup withholding include the
following:
 
- - Payments of interest on obligations issued by individuals.
 
NOTE: You may be subject to backup withholding if this interest is $600 or more
and is paid in the course of the payer's trade or business and you have not
provided your correct TIN to the payer.
 
- - Payments of tax-exempt interest (including exempt-interest dividends under
section 852).
 
- - Payments described in section 6049(b)(5) to nonresident aliens.
 
- - Payments on tax-free covenant bonds under section 1451.
 
- - Payments made by certain foreign organizations.
 
- - Mortgage interest paid to you.
 
 Payments that are not subject to information reporting are also not subject to
backup withholding. For details, see sections 6041, 6041A(a), 6042, 6044, 6045,
6049, 6050A, and 6050N, and their regulations.
 
PENALTIES
 
FAILURE TO FURNISH TIN.-- If you fail to furnish your correct TIN to a
requester, you are subject to a penalty of $50 for each such failure unless your
failure is due to reasonable cause and not to willful neglect.
 
CIVIL PENALTY FOR FALSE INFORMATION WITH RESPECT TO WITHHOLDING.-- If you make a
false statement with no reasonable basis that results in no backup withholding,
you are subject to a $500 penalty.
 
CRIMINAL PENALTY FOR FALSIFYING INFORMATION.-- Willfully falsifying
certifications or affirmations may subject you to criminal penalties including
fines and/or imprisonment.
 
MISUSE OF TINS.-- If the requester discloses or uses TINs in violation of
Federal law, the requester may be subject to civil and criminal penalties.
 
SPECIFIC INSTRUCTIONS
 
NAME.-- If you are an individual, you must generally provide the name shown on
your social security card. However, if you have changed your last name, for
instance, due to marriage, without informing the Social Security Administration
of the name change, please enter your first name, the last name shown on your
social security card, and your new last name.
 
 If you are a sole proprietor, you must furnish your individual name and either
your SSN or EIN. You may also enter your business name or "doing business as"
name on the business name line. Enter your name(s) as shown on your social
security card and/or as it was used to apply for your EIN on Form SS-4.
 
SIGNING THE CERTIFICATION.--
 
 1. INTEREST, DIVIDEND, AND BARTER EXCHANGE ACCOUNTS OPENED BEFORE 1984 AND
BROKER ACCOUNTS CONSIDERED ACTIVE DURING 1983. You are required to furnish your
correct TIN, but you are not required to sign the certification.
 
 2. INTEREST, DIVIDEND, BROKER, AND BARTER EXCHANGE ACCOUNTS OPENED AFTER 1983
AND BROKER ACCOUNTS CONSIDERED INACTIVE DURING 1983. You must sign the
certification or backup withholding will apply. If you are subject to backup
withholding and you are merely providing your correct TIN to the requester, you
must cross out item 2 in the certification before signing the form.
 
 3. REAL ESTATE TRANSACTIONS. You must sign the certification. You may cross out
item 2 of the certification.
 
 4. OTHER PAYMENTS.You are required to furnish your correct TIN, but you are not
required to sign the certification unless you have been notified of an incorrect
TIN. Other payments include payments made in the course of the requester's trade
or business for rents, royalties, goods (other than bills for merchandise),
medical and health care services, payments to a nonemployee for services
(including attorney and accounting fees), and payments to certain fishing boat
crew members.
 
 5. MORTGAGE INTEREST PAID BY YOU, ACQUISITION OR ABANDONMENT OF SECURED
PROPERTY, OR IRA CONTRIBUTIONS. You are required to furnish your correct TIN,
but you are not required to sign the certification.
 
 6. EXEMPT PAYEES AND PAYMENTS. If you are exempt from backup withholding, you
should complete this form to avoid possible erroneous backup withholding. Enter
your correct TIN in Part 1, write "EXEMPT" in the block in Part II, and sign and
date the form. If you are a nonresident alien or foreign entity not subject to
backup withholding, give the requester a completed Form W-8, Certificate of
Foreign Status.
 
 7. TIN "APPLIED FOR". Follow the instructions under How To Obtain a TIN, on
page 1, and sign and date this form.
 
SIGNATURE.-- For a joint account, only the person whose TIN is shown in Part I
should sign.
 
PRIVACY ACT NOTICE.-- Section 6109 requires you to furnish your correct TIN to
persons who must file information returns with IRS to report interest,
dividends, and certain other income paid to you, mortgage interest you paid, the
acquisition or abandonment of secured property, or contributions you made to an
IRA. The IRS uses the numbers for identification purposes and to help verify the
accuracy of your tax return. You must provide your TIN whether or not you are
required to file a tax return. Payers must generally withhold 31% of taxable
interest, dividend, and certain other payments to a payee who does not furnish a
TIN to a payer. Certain penalties may also apply.
 
WHAT NAME AND NUMBER TO GIVE THE REQUESTER
 
<TABLE>
<S>                         <C>
- -------------------------------------------
FOR THIS TYPE OF ACCOUNT:   GIVE NAME AND SSN OF:
- -------------------------------------------
 1. Individual              The individual
 2. Two or more             The actual owner of the
    individuals (joint      account or, if combined
    account)                funds, the first
                            individual on the
                            account.(1)
 3. Custodian account of    The minor(2)
    a minor (Uniform
    Gift to Minors Act)
 4. a. The usual            The grantor-trustee(1)
       revocable savings
       trust (grantor is
       also trustee)
   b. So-called trust       The actual owner(1)
      account that is
      not a legal or
      valid trust under
      state law
 5. Sole proprietorship     The owner(3)
- -------------------------------------------
FOR THIS TYPE OF ACCOUNT:   GIVE NAME AND EIN OF:
- -------------------------------------------
 6. Sole proprietorship     The owner(3)
 7. A valid trust,          Legal entity(4)
    estate, or pension
    trust
 8. Corporate               The corporation
 9. Association, club,      The organization
    religious,
    charitable,
    educational, or
    other tax-exempt
    organization
10. Partnership             The partnership
11. A broker or             The broker or nominee
    registered nominee
12. Account with the        The public entity
    Department of
    Agriculture in the
    name of a public
    entity (such as a
    state or local
    government, school
    district, or prison)
    that receives
    agricultural program
    payments
- -------------------------------------------
</TABLE>
 
(1) List first and circle the name of the person whose number you furnish.
 
(2) Circle the minor's name and furnish the minor's SSN.
 
(3) Show your individual name. You may also enter your business name. You may
    use your SSN or EIN.
 
(4) List first and circle the name of the legal trust, estate, or pension trust.
    (Do not furnish the TIN of the personal representative or trustee unless the
    legal entity itself is not designated in the account title.)
 
NOTE: If no name is circled when there is more than one name, the number will be
   considered to be that of the first name listed.
 
W-9.2

<PAGE>   1
[DEVON ENERGY CORPORATION LETTERHEAD]


                                  NEWS RELEASE
- --------------------------------------------------------------------------------

FOR IMMEDIATE RELEASE

Contact:      Vince White
              Director of Investor Relations
              (405) 552-4505

              DEVON ENERGY CORPORATION ANNOUNCES CASH TENDER OFFER
              FOR BURLINGTON RESOURCES COAL SEAM GAS ROYALTY TRUST

OKLAHOMA CITY, OKLAHOMA, February 13, 1998 - As proposed in its press release
of February 11, 1998, Devon Energy Corporation ("Devon") today commenced its
tender offer (the "Offer") for any and all of the units of beneficial interest
("Units") of Burlington Resources Coal Seam Gas Royalty Trust (the "Trust"). In
a Schedule 14D-1 filed today with the Securities and Exchange Commission, Devon
indicated it will offer $8.75 per Unit in cash. The Offer will be conducted by
a newly formed subsidiary of Devon, Devon Acquisition Corporation.

If all of the Trust's Units are tendered, the transaction would have a total
value of approximately $78 million. Devon anticipates using its cash on hand
and committed credit lines to fund the transaction. Accordingly, the Offer is
not conditioned upon obtaining financing. The Offer is not conditioned on the
tender for any minimum or maximum number of Units.

The Offer will expire at 12:00 midnight, New York City time, on March 13, 1998,
unless the Offer is extended. Devon anticipates that this expiration date will
be after the record date for the Trust's normal quarterly distribution in March
1998. If so, Unit holders tendering their Units to Devon will be entitled to
both the $8.75 cash per Unit plus the Trust's March 1998 distributions of cash
and tax credits. The Trust's December 1997 quarterly distributions per Unit
were $0.125 in cash and $0.16 in tax credits. These amounts may or may not be
indicative of the upcoming distributions.

The Trust is currently the subject of a tender offer being conducted by San
Juan Partners, L.L.C. Unit holders who previously have tendered their Units to
San Juan Partners, L.L.C. have the right to withdraw those tenders and tender
their Units to Devon Acquisition Corporation. Unit holders wishing to do so
should contact D.F. King & Co. Inc. at (800)431-9642.

Devon intends to hold any Units it acquires in the Offer for investment
purposes.

Salomon Smith Barney will act as Dealer Manager for the Devon Offer. Offering
materials will be available from Salomon Smith Barney and from the Information
Agent, D.F. King & Co., Inc. The depositary for the Offer is Harris Trust
Company of New York.

Devon Energy Corporation is an independent energy company engaged in oil and
gas property acquisition, exploration and production. It is one of the top 20
public independent oil and gas companies in the United States, as measured by
oil and gas reserves. Devon's common shares trade on the American Stock
Exchange under the symbol DVN.


                                      ###

<PAGE>   1
   This announcement is neither an offer to purchase nor a solicitation of an
   offer to sell the Units. The Offer is made solely by the Offer to Purchase
     dated February 13, 1998, and the related Letter of Transmittal and any
 amendments or supplements thereto, and is being made to all holders of Units.
The Purchaser is not aware of any jurisdiction where the making of the Offer is
prohibited by any administrative or judicial action pursuant to any valid state
 statute. If the Purchaser becomes aware of any valid state statute prohibiting
  the making of the Offer or the acceptance of the Units pursuant thereto, the
 Purchaser will make a good faith effort to comply with such state statute. If,
 after such good faith effort, the Purchaser cannot comply with any such state
statute, the Offer will not be made to (nor will tenders be accepted from or on
  behalf of) the holders of Units in such state. In any jurisdiction where the
 securities, blue sky or other laws require the Offer to be made by a licensed
    broker or dealer, the Offer shall be deemed to be made on behalf of the
  Purchaser by the Dealer Manager or one or more registered brokers or dealers
             that are licensed under the laws of such jurisdiction.

                      NOTICE OF OFFER TO PURCHASE FOR CASH
                    ANY AND ALL UNITS OF BENEFICIAL INTEREST
                                       OF
                BURLINGTON RESOURCES COAL SEAM GAS ROYALTY TRUST
                                       BY
                         DEVON ACQUISITION CORPORATION
                          A WHOLLY-OWNED SUBSIDIARY OF
                            DEVON ENERGY CORPORATION
                                       AT
                               $8.75 NET PER UNIT

     Devon Acquisition Corporation, a Delaware corporation (the "Purchaser")
and a wholly-owned subsidiary of Devon Energy Corporation, is offering to
purchase any and all Units of Beneficial Interest (the "Units") of Burlington
Resources Coal Seam Gas Royalty Trust (the "Trust"), at a price of $8.75 per
Unit, net to the seller in cash, without interest (the "Purchase Price"), upon
the terms and subject to the conditions set forth in the Offer to Purchase
dated February 13, 1998 (the "Offer to Purchase"), and in the related Letter of
Transmittal (which, together with any amendments or supplements thereto,
collectively constitute the "Offer").

         THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT,
  NEW YORK CITY TIME, ON FRIDAY, MARCH 13, 1998, UNLESS THE OFFER IS EXTENDED.

     THE OFFER IS NOT CONDITIONED UPON ANY MINIMUM NUMBER OF UNITS BEING
TENDERED OR UPON THE OBTAINING OF FINANCING. THE OFFER IS SUBJECT TO CERTAIN
OTHER TERMS AND CONDITIONS THAT ARE CONTAINED IN THE OFFER TO PURCHASE.

     For purposes of the Offer, the Purchaser shall be deemed to have accepted
for payment (and thereby purchased) Units validly tendered and not withdrawn
as, if and when the Purchaser gives oral or written notice to Harris Trust
Company of New York (the "Depositary") of the Purchaser's acceptance of such
Units for payment pursuant to the Offer. Upon the terms and subject to the
conditions of the Offer, payment for Units purchased pursuant to the Offer will
be made by deposit of the Purchase Price therefor with the Depositary, which
will act as the agent for tendering Unit holders for the purpose of receiving
payments from the Purchaser and transmitting such payments to tendering Unit
holders whose Units have been accepted for payment. Under no circumstances
will interest on the Purchase Price be paid by the Purchaser, regardless of any
delay in making such payment. In all cases, payment for Units purchased
pursuant to the Offer will be made only after timely receipt by the Depositary
of (i) certificates for such Units or timely confirmation of a book-entry
transfer of such Units into the Depositary's account at the Book-Entry Transfer
Facility (as defined in the Offer to Purchase) pursuant to the procedures set
forth in the Offer to Purchase, (ii) the Letter of Transmittal (or facsimile
thereof), properly completed and duly executed, with any required signature
guarantees, or an Agent's Message (as defined in the Offer to Purchase) in
connection with a book-entry transfer and (iii) any other documents required by
the Letter of Transmittal.

     Tenders of Units made pursuant to the Offer are irrevocable, except that
Units tendered pursuant to the Offer may be withdrawn pursuant to the
procedures set forth in the Offer to Purchase at any time prior to the
Expiration Date (as defined in the Offer to Purchase) and, unless theretofore
accepted for payment by the Purchaser, may also be withdrawn at any time after
April 13, 1998. For a withdrawal to be effective, a written, telegraphic or
facsimile transmission notice of withdrawal must be timely received by the
Depositary at one of its addresses specified on the back cover of the Offer to
Purchase. Any such notice of withdrawal must specify the name of the person who
tendered the Units to be withdrawn, the number of Units to be withdrawn, and
the name of the registered holder of the Units, if different from the name of
the person who tendered such Units. If certificates for Units to be withdrawn
have been delivered or otherwise identified to the Depositary, then, prior to
the release of such certificates, the serial numbers shown on such certificates
must be submitted to the Depositary and, unless such Units have been tendered
by an Eligible Institution (as defined in the Offer to Purchase), the
signatures on the notice of withdrawal must be guaranteed by an Eligible
Institution. If Units have been tendered pursuant to the procedure for
book-entry transfer as set forth in the Offer to Purchase, any notice of
withdrawal must specify the name and number of the account at the Book-Entry
Transfer Facility to be credited with the withdrawn Units and otherwise comply
with the Book-Entry Transfer Facility's procedures. Withdrawals of tenders of
Units may not be rescinded, and any Units properly withdrawn will thereafter be
deemed not validly tendered for any purposes of the Offer. However, withdrawn
Units may be retendered by again following one of the procedures described in
the Offer to Purchase at any time prior to the Expiration Date. All questions
as to the form and validity (including time of receipt) of notices of
withdrawal will be determined by the Purchaser, in its sole discretion, whose
determination will be final and binding.

     Subject to the applicable rules of the Securities and Exchange Commission
(the "Commission"), the Purchaser expressly reserves the right, in its sole
discretion, at any time or from time to time, (i) to extend the period of time
during which the Offer is open and thereby delay acceptance for payment of, and
the payment for, all Units validly tendered by giving oral or written notice of
such extension to the Depositary and (ii) to amend the Offer in any respect, by
giving oral or written notice of such extension or amendment to the Depositary.
The rights reserved by the Purchaser in this paragraph are in addition to the
Purchaser's rights to terminate the Offer pursuant to the Offer to Purchase.
Under no circumstances will interest be paid on the Purchase Price for tendered
Units, whether or not the Purchaser exercises its right to extend the Offer.

     Subject to the applicable rules of the Commission, if any or all of the
conditions set forth in the Offer to Purchase are not satisfied prior to the
Expiration Date, the Purchaser reserves the right (but shall not be obligated)
in its sole discretion to (i) decline to purchase any of the Units tendered in
the Offer, terminate the Offer and return all tendered Units to the tendering
Unit holders, (ii) waive or amend any or all conditions to the Offer to the
extent permitted by applicable law and, subject to complying with applicable
rules and regulations of the Commission, purchase all Units validly tendered,
(iii) extend the Offer and, subject to the right of the Unit holders to
withdraw Units until the Expiration Date, retain the Units that have been
tendered during the period or periods for which the Offer is extended or (iv)
amend the Offer.

     The information required to be disclosed by paragraph (e)(1)(vii) of Rule
14d-6 of the General Rules and Regulations under the Securities Exchange Act of
1934, as amended, is contained in the Offer to Purchase and is incorporated
herein by reference.

      A request is being made to the Trustee of the Trust for the use of the
Trust's Unit holder list and security position listings for the purpose of
disseminating the Offer to holders of Units. Once the Trust has provided such
list and listings or otherwise complied with such request, the Offer to Purchase
and the related Letter of Transmittal and other relevant materials will be
mailed to record holders of Units and will be furnished to brokers, dealers,
commercial banks, trust companies and similar persons whose names, or the name
of whose nominees, appear on the Unit holder list or, if applicable, who are
listed as participants in a clearing agency's security position listing for
subsequent transmittal to beneficial owners of Units.

     THE OFFER TO PURCHASE AND THE LETTER OF TRANSMITTAL CONTAIN IMPORTANT
INFORMATION WHICH SHOULD BE READ CAREFULLY BEFORE ANY DECISION IS MADE WITH
RESPECT TO THE OFFER.

     Questions and requests for copies of the Offer to Purchase and the related
Letter of Transmittal and other tender offer materials may be directed to D.F.
King & Co., Inc., the Information Agent, or Salomon Smith Barney, the Dealer
Manager, at their respective addresses and telephone numbers set forth below,
and copies will be furnished promptly at the Purchaser's expense. No fees or
commissions will be paid to brokers, dealers or other persons (other than the
Dealer Manager and the Information Agent) for soliciting tenders of the Units
pursuant to the Offer.

                    The Information Agent for the Offer is:

                             D.F. KING & CO., INC.
                                77 Water Street
                            New York, New York 10005
                           Toll Free: (800) 431-9642


                      The Dealer Manager for the Offer is:

                              SALOMON SMITH BARNEY
                            Seven World Trade Center
                            New York, New York 10048
                                 (212) 783-8527

Salomon Smith Barney is a service mark of Smith Barney Inc. Salomon Brothers
Inc and Smith Barney Inc. are affiliated but separately registered
broker/dealers under common control of Salomon Smith Barney Holdings Inc.
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February 13, 1998

<PAGE>   1
 
                   WITHDRAWAL OF UNITS OF BENEFICIAL INTEREST
                                       OF
 
                BURLINGTON RESOURCES COAL SEAM GAS ROYALTY TRUST
                   TENDERED PURSUANT TO THE OFFER TO PURCHASE
                                       OF
 
                           SAN JUAN PARTNERS, L.L.C.
 
TO HOLDERS OF UNITS OF BURLINGTON RESOURCES COAL SEAM GAS ROYALTY TRUST WHO HAVE
TENDERED UNITS, PURSUANT TO THE OFFER OF SAN JUAN PARTNERS, L.L.C.
 
     The Offer to Purchase dated January 20, 1998, as amended through January
22, 1998 (as supplemented from time to time, the "SJP Offer to Purchase"), of
San Juan Partners, L.L.C. ("SJP") and certain other parties named therein,
offering to purchase 5,446,860 Units of Beneficial Interest ("Units") of
Burlington Resources Coal Seam Gas Royalty Trust (the "Trust") at a price of
$8.25 per Unit (the "SJP Tender Offer"), provides that Units that have been
tendered pursuant to the terms of the SJP Offer to Purchase may be withdrawn if
the application procedures set forth in "THE TENDER OFFER -- 3. Withdrawal
Rights" of the SJP Offer to Purchase are followed.
 
     The section of the SJP Offer to Purchase entitled "THE TENDER OFFER -- 3.
Withdrawal Rights" provides in relevant part as follows:
 
          For a withdrawal to be effective, a written, telegraphic, or facsimile
     transmission notice of withdrawal must be timely received by the Depositary
     at one of its addresses specified on the back cover of this Offer to
     Purchase. Any such notice of withdrawal must specify the name of the person
     who tendered the Units to be withdrawn, the number of Units to be
     withdrawn, and (if certificates for Units have been tendered) the name of
     the registered holder of the Units as set forth in the certificate for the
     Unit, if different from the name of the person who tendered such Units. If
     certificates for Units to be withdrawn have been delivered or otherwise
     identified to the Depositary, then, prior to the release of such
     certificates, the serial numbers shown on such certificates must be
     submitted to the Depositary and, unless such Units have been tendered by an
     Eligible Institution, the signatures on the notice of withdrawal must be
     guaranteed by an Eligible Institution. If Units have been tendered pursuant
     to the procedure for book-entry transfer as set forth in "THE TENDER
     OFFER -- 2. Procedures for Tendering Units," any notice of withdrawal must
     also specify the name and number of the account at the Book-Entry Transfer
     Facility to be credited with the withdrawn Units and otherwise comply with
     the Book-Entry Transfer Facility's procedures. Withdrawals of tenders of
     Units may not be rescinded and any Units properly withdrawn will thereafter
     be deemed not validly tendered for purposes of the Offer. However,
     withdrawn Units may be retendered by again following one of the procedures
     described in "THE TENDER OFFER -- 2. Procedures for Tendering Units" at any
     time prior to the Expiration Date.
 
     In connection with the offer (the "Devon Tender Offer") to purchase any and
all Units of the Trust by Devon Acquisition Corporation (the "Purchaser"), a
wholly-owned subsidiary of Devon Energy Corporation ("Devon"), described in the
Purchaser's Offer to Purchase dated February 13, 1998 (as supplemented from time
to time, the "Devon Offer to Purchase"), the Purchaser, for the convenience of
holders of Units, has provided on the attached page a form of "Notice of
Withdrawal" which if properly completed and delivered to The Bank of New York,
the depositary for the SJP Tender Offer, will enable holders of Units to
properly withdraw Units tendered pursuant to the SJP Tender Offer. This form, a
facsimile thereof or any other proper notice of withdrawal may be delivered by
hand or sent by telegraph or facsimile transmission or letter to The Bank of New
York.
<PAGE>   2
 
     Units held by The Bank of New York under the SJP Tender Offer must first be
withdrawn before they can be tendered into the Devon Tender Offer. Unit holders
who desire assistance in withdrawing Units tendered pursuant to the SJP Tender
Offer may contact the Information Agent for the Devon Tender Offer at its
address and telephone numbers set forth below.
 
     Copies of the Devon Offer to Purchase and the related Letter of Transmittal
are also available from the Information Agent for the Devon Tender Offer, which
will expire at 12:00 Midnight, New York City time, on Friday, March 13, 1998,
unless extended.
 
               The Information Agent for the Devon Tender Offer:
 
                             D.F. KING & CO., INC.
 
                                77 Water Street
                            New York, New York 10005
                                 (212) 269-5550
                                 (call collect)
                                       or
                         Call Toll-Free (800) 431-9642.
<PAGE>   3
 
                              NOTICE OF WITHDRAWAL
                                       OF
                          UNITS OF BENEFICIAL INTEREST
                                       OF
 
                BURLINGTON RESOURCES COAL SEAM GAS ROYALTY TRUST
                              TENDERED PURSUANT TO
                  THE OFFER TO PURCHASE DATED JANUARY 20, 1998
                                       OF
 
                           SAN JUAN PARTNERS, L.L.C.
 
                           TO:   THE BANK OF NEW YORK
 
<TABLE>
<C>                             <C>                             <C>
           By Mail:                     By Facsimile:           By Hand Delivery or Overnight:
 Tender & Exchange Department           (212) 815-6213                Tenders & Exchange
        P.O. Box 11248                                                    Department
    Church Street Station                                             101 Barclay Street
      New York, New York                                         Receive and Delivery Window
          10286-1248                                               New York, New York 10286
                                    Confirm by Telephone:
                                        (800) 507-9357
</TABLE>
 
Gentlemen: the undersigned hereby withdraws the Units of Beneficial Interest
(the "Units") of Burlington Resources Coal Seam Gas Royalty Trust identified
below:
 
Name(s) of persons who tendered Units to be withdrawn

_____________________________________________________________________________

Name(s) of registered holder(s) (if different): _____________________________

Number of Units withdrawn: __________________________________________________
 
(the rest to be completed only if certificates for Units have been delivered or
otherwise identified to The Bank of New York or tendered by book-entry transfer)
 
Certificate Number(s)*: _____________________________________________________
If applicable, check the box for the Book-Entry Transfer Facility where Units
were tendered:
 
[ ] The Depository Trust Company ("DTC")
 
[ ] Philadelphia Depository Trust Company ("PDTC")
 
Account number(s): __________________________________________________________
 
Name of the account: ________________________________________________________
 
                        (MUST BE SIGNED ON REVERSE SIDE)
 
* Call D.F. King & Co., Inc. at (800) 431-9642 for assistance if you do not have
your Certificate Number(s).
<PAGE>   4
 
                             UNIT HOLDER SIGN HERE
 
     Must be signed by registered holders(s) exactly as name(s) appear(s) on
Unit certificate(s) or on a security position listing or by person(s) authorized
to become registered holder(s) by certificates and documents previously
transmitted or transmitted herewith. If signature is by trustee, executor,
administrator, guardian, attorney-in-fact, officer of a corporation or other
person acting in a fiduciary or representative capacity, please set forth the
full title of such person.
 
________________________________________________________________________________
 
________________________________________________________________________________
                            Signature(s) of Owner(s)
 
Dated: ___________________________
 
Name(s): ______________________________________________________________________

_______________________________________________________________________________

                                  Please Print
 
Capacity (full title): _________________________________________________________
 
Address: _______________________________________________________________________
 
________________________________________________________________________________
                                                            (Including Zip Code)
 
(Area Code and Tel. No.): ______________________________________________________
 
                              SIGNATURE GUARANTEE*
 
(required if certificates for Units have been delivered or otherwise identified
                                       to
                             The Bank of New York)
 
Authorized Signature: __________________________________________________________
 
Name: __________________________________________________________________________
 
Title: _________________________________________________________________________
 
Address: _______________________________________________________________________
 
Name of Firm: __________________________________________________________________
 
(Area Code and Tel. No.): ______________________________________________________
 
Dated: ___________________________
 
* The Unit holder's signature above must be guaranteed by a firm that is a bank,
  broker, dealer, credit union, savings association or other entity that is a
  member in good standing of the Securities Transfer Agent's Medallion Program,
  the Stock Exchange Medallion Program or the New York Stock Exchange, Inc.
  Medallion Signature Program (each, an "Eligible Institution"), unless the Unit
  holder is itself an Eligible Institution.

<PAGE>   1
[DEVON ENERGY CORPORATION LETTERHEAD]


                                  NEWS RELEASE
- --------------------------------------------------------------------------------

FOR IMMEDIATE RELEASE

Contact:      Vince White
              Director of Investor Relations
              (405) 552-4505

              DEVON ENERGY CORPORATION ANNOUNCES CASH TENDER OFFER
              FOR BURLINGTON RESOURCES COAL SEAM GAS ROYALTY TRUST

OKLAHOMA CITY, OKLAHOMA, February 11, 1998 - Devon Energy Corporation ("Devon")
announced today that it intends to commence a tender offer (the "Offer") for
any and all of the units of beneficial interest ("Units") of Burlington 
Resources Coal Seam Gas Royalty Trust (the "Trust"). Devon said it will offer
$8.75 per Unit in cash. The Offer will not be conditioned on the tender of
any minimum or maximum number of Units.

If all of the Trust's Units are tendered, the transaction would have a total
value of approximately $80 million. Devon anticipates using its cash on hand
and committed credit lines to fund the transaction. Accordingly, the Offer
would not be conditioned upon obtaining financing.

The Offer is expected to commence on or prior to February 13, 1998. The 
initial expiration of the Offer is expected to be approximately March 13,
1998. Devon anticipates that this expiration date will be after the record date
for the Trust's normal quarterly distribution in March 1998. If so, Unitholders
tendering their Units to Devon will be entitled to both the $8.75 cash per Unit
plus the Trust's March 1998 distributions of cash and tax credits. The Trust's
December 1997, quarterly distributions per Unit were $0.125 in cash and $0.16 in
tax credits. These amounts may or may not be indicative of the upcoming
distributions.

Created in June 1993, the Trust holds certain economic interests in the
Northeast Blanco Unit ("NEBU") of northwest New Mexico. The Trust's Unitholders
receive net cash flow and certain tax credits attributable to the coal seam gas
production from NEBU. Devon, also, holds interests in NEBU and is the operator
of the property. Devon drilled the first coal seam gas wells at NEBU in 1988,
and has continued to develop the property since that time.

Devon intends to hold any Units it acquires in the Offer for investment
purposes.

Salomon Smith Barney will act as Dealer Manager for the Devon Offer. Offering
materials will be available from Salomon Smith Barney.


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