Document:

Exhibit 4.5

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                               GUARANTEE AGREEMENT

                                     made by

                            BURLINGTON RESOURCES INC.

                                  as Guarantor

                                   dated as of

                                February 12, 2001

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                                TABLE OF CONTENTS

                                                                            Page

                                   ARTICLE ONE

                        DEFINITIONS AND OTHER PROVISIONS
                             OF GENERAL APPLICATION

SECTION 1.01.  Definitions....................................................1

                                   ARTICLE TWO

                                    GUARANTEE

SECTION 2.01.  Unconditional Guarantee........................................3
SECTION 2.02.  Execution of Guarantee.........................................3
SECTION 2.03.  Subordination of Subrogation and Other Rights..................4

                                  ARTICLE THREE

              CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

SECTION 3.01.  Guarantor May Consolidate, Etc., Only on Certain Terms.........4
SECTION 3.02.  Successor Corporation Substituted..............................5
SECTION 3.03.  Assignment to the Guarantor of the Company's Obligations.......5

                                  ARTICLE FOUR

                                   AMENDMENTS

SECTION 4.01.  Amendments Without Consent of Holders..........................5
SECTION 4.02.  Amendments With Consent of Holders.............................6
SECTION 4.03.  Execution of Amendments........................................6
SECTION 4.04.  Effect of Amendments...........................................6
SECTION 4.05.  Conformity With Trust Indenture Act............................7
SECTION 4.06.  Reference in Guarantees to Amendments..........................7

                                  ARTICLE FIVE

                                    COVENANTS

SECTION 5.01.  Money for Security Payments To Be Held in Trust................7
SECTION 5.02.  Limitation on Liens............................................7
SECTION 5.03.  Waiver of Certain Covenants...................................10
SECTION 5.04.  Reports by Guarantor..........................................10

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                                                                            Page

                                   ARTICLE SIX

                                  MISCELLANEOUS

SECTION 6.01.  Trust Indenture Act...........................................11
SECTION 6.02.  Effect of Headings and Table of Contents......................11
SECTION 6.03.  Successors and Assigns........................................11
SECTION 6.04.  Separability Clause...........................................11
SECTION 6.05.  Benefits of Agreement.........................................11
SECTION 6.06.  Governing Law.................................................12
SECTION 6.07.  Notices, Etc., to the Guarantor...............................12

EXHIBIT A         Form of Guarantee

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     GUARANTEE AGREEMENT (this "Agreement"), dated as of February 12, 2001, made
by Burlington Resources Inc., a Delaware corporation (the "Guarantor"), whose
principal place of business is 5051 Westheimer, Suite 1400, Houston, Texas
77056, the parent of Burlington Resources Finance Company, an unlimited
liability company organized under the laws of Nova Scotia, Canada, (the
"Company"), in favor of the Holders (as defined in the Indenture referred to
below) and the Trustee (as defined below).

     Reference is made to the Indenture (as the same may be amended, restated,
supplemented or modified from time to time, the "Indenture") between the Company
and Citibank, N.A., as trustee (the "Trustee") dated as of February 12, 2001,
relating to the securities issued thereunder (the "Securities").

                            RECITALS OF THE GUARANTOR

     The Guarantor has duly authorized the execution and delivery of this
Agreement and has agreed to guarantee the Securities pursuant to the terms of
the Indenture and this Agreement;

     All things necessary to make this Agreement a valid agreement of the
Guarantor, in accordance with its terms, have been done.

                  NOW, THEREFORE, THIS AGREEMENT WITNESSETH:

     That in order to declare the terms and conditions upon which the guarantee
of the securities (the "Guarantee") is made, executed, authenticated and
delivered, the Guarantor covenants and agrees, for the equal and proportionate
benefit of all Holders (as defined below) of the Securities or of any series
thereof, as follows:

                                   ARTICLE ONE

                        Definitions and other provisions
                             of general application

     SECTION 1.01. Definitions

     For all purposes of this Agreement hereto, except as otherwise expressly
provided or unless the context otherwise requires:

          (1) the terms defined in this Article One have the meanings assigned
     to them in this Article One and include the plural as well as the singular;

          (2) the capitalized terms not defined in this Agreement have the
     meanings assigned to them in the Indenture;

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          (3) all accounting terms not otherwise defined herein have the
     meanings assigned to them in accordance with generally accepted accounting
     principles, and, except as otherwise herein expressly provided, the term
     "generally accepted accounting principles" with respect to any computation
     required or permitted hereunder shall mean such accounting principles as
     are generally accepted at the date of this Agreement; and

          (4) the words "herein," "hereof" and "hereunder" and other words of
     similar import refer to this Agreement as a whole and not to any particular
     Article, Section or other subdivision.

     "Consolidated Net Tangible Assets" means the aggregate amount of assets of
the Guarantor and its Subsidiaries (less applicable reserves and other properly
deductible items) after deducting therefrom (i) all current liabilities
(excluding any which are by their terms extendible or renewable at the option of
the obligor thereon to a time more than 12 months after the time as of which the
amount thereof is being computed), and (ii) all goodwill, trade names,
trademarks, patents, organization expenses and other like intangibles of the
Guarantor and its Subsidiaries, all as set forth on the most recent balance
sheet of the Guarantor and its Subsidiaries and computed in accordance with
generally accepted accounting principles.

     "Principal Property" means any oil, gas or mineral producing property, or
any refining, processing, smelting or manufacturing facility, of the Guarantor
or any Restricted Subsidiary located in the United States of America, other than
(i) property employed in transportation, distribution or marketing, (ii)
information and electronic data processing equipment, (iii) any refinery,
preparation plant, concentrator, smelter, mill or handling, processing or
manufacturing facility in which the interests held by the Guarantor or by one or
more Restricted Subsidiaries or both and by others and the aggregate interest
held by the Guarantor and all Restricted Subsidiaries does not equal or exceed
50%, (iv) any property which in the opinion of the Board of Directors of the
Guarantor is not materially important to the total business conducted by the
Guarantor and its Subsidiaries as an entirety or (v) any property or a portion
of a particular property which in the opinion of the Board of Directors of the
Guarantor is not materially important to the use or operation of such property.

     "Restricted Subsidiary" means a Subsidiary of the Guarantor (i)
substantially all the property of which is located, or substantially all the
business of which is carried on, within the United States of America, (ii) which
owns a Principal Property and (iii) which has Stockholders' Equity exceeding 2%
of Consolidated Net Tangible Assets of the Guarantor.

     "Stockholders' Equity" means, with respect to any Person, stockholders'
equity, as computed in accordance with generally accepted accounting principles.

     "Subsidiary" means a corporation more than 50% of the outstanding Voting
Stock of which is owned, directly or indirectly, by the Guarantor or by one or
more other Subsidiaries, or by the Guarantor and one or more other Subsidiaries.

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                                   ARTICLE TWO

                                    Guarantee

     SECTION 2.01. Unconditional Guarantee

     The Guarantor hereby unconditionally guarantees to each Holder of a
Security authenticated by the Trustee and to the Trustee and its successors and
assigns that: the principal of, premium thereon (if any) and interest on each
series of Securities will be promptly paid in full when due, subject to any
applicable grace period, whether at maturity, by acceleration or otherwise, and
interest on the overdue principal and interest on any overdue interest on each
series of Securities and all other obligations of the Company to the Holders or
the Trustee hereunder or under the Indenture or such series of Securities will
be promptly paid in full or performed, all in accordance with the terms hereof
and thereof. The Guarantor hereby agrees that its obligations hereunder shall be
unconditional, irrespective of the validity, regularity or enforceability of
each series of Securities of the Indenture or any series of Securities, the
absence of any action to enforce the same, any waiver or consent by any Holder
of the Indenture of any series of Securities with respect to any provisions
hereof or thereof, the recovery of any judgment against the Company, any action
to enforce the same or any other circumstance which might otherwise constitute a
legal or equitable discharge or defense of the Guarantor. The Guarantor hereby
waives diligence, presentment, demand of payment, filing of claims with a court
in the event of insolvency or bankruptcy of the Company, any right to require
proceeding first against the Company, protest, notice and all demands whatsoever
and covenants that the Guarantee will not be discharged except by complete
performance of the obligations contained in the Indenture and each series of
Securities. If any Holder or the Trustee is required by any court or otherwise
to return to the Company or the Guarantor or any custodian, trustee, liquidator
or other similar official acting in relation to the Company or the Guarantor,
any amount paid by the Company or Guarantor to the Trustee or such Holder, the
Guarantee, to the extent theretofore discharged, shall be reinstated in full
force and effect.

     SECTION 2.02. Execution of Guarantee

     To further evidence the Guarantee to the Holders, the Guarantor hereby
agrees to execute a Guarantee substantially in the form of Exhibit A hereto, to
be endorsed on and made a part of each Security ordered to be authenticated and
delivered by the Trustee. The Guarantor hereby agrees that its Guarantee set
forth in Section 2.01 shall remain in full force and effect notwithstanding any
failure to endorse on each Security a Guarantee. Each such Guarantee shall be
signed on behalf of the Guarantor by its Chairman of the Board, its President or
one of its Vice Presidents prior to the authentication of the Security on which
it is endorsed, and the delivery of such Security by the Trustee, after the
authentication thereof hereunder, shall constitute due delivery of such
Guarantee on behalf of the Guarantor. Such signature upon the Guarantee may be a
manual or facsimile signature of such officer and may be imprinted or otherwise
reproduced on the Guarantee, and in case such officer who shall have signed the
Guarantee shall cease to be such officer before the Security on which Guarantee
is endorsed shall have been authenticated and delivered by the Trustee or
disposed of by the

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Company, the Security nevertheless may be authenticated and delivered or
disposed of as though the Person who signed the Guarantee had not ceased to be
such officer of the Guarantor.

     SECTION 2.03. Subordination of Subrogation and Other Rights

     The Guarantor hereby agrees that any claim against the Company that arises
from the payment, performance or enforcement of the Guarantor's obligations
under the Guarantee or the Indenture, including, without limitation, any right
of subrogation, shall be subject and subordinate to, and no payment with respect
to any such claim of the Guarantor shall be made before, the payment in full in
cash of all outstanding Securities of each series in accordance with the
provisions provided therefor in the Indenture.

                                  ARTICLE THREE

              CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

     SECTION 3.01. Guarantor May Consolidate, Etc., Only on Certain Terms

     The Guarantor shall not consolidate with or merge into any other Person or
convey, transfer or lease its properties and assets substantially as an entirety
to any Person, unless:

          (1) in case the Guarantor shall consolidate with or merge into another
     Person or convey, transfer or lease its properties and assets substantially
     as an entirety to any Person, the Person formed by such consolidation or
     into which the Guarantor is merged or the Person which acquires by
     conveyance or transfer, or which leases, the properties and assets of the
     Guarantor substantially as an entirety shall be a corporation, partnership,
     limited liability company or trust organized and existing under the laws of
     the United States of America, any state thereof or the District of Columbia
     and shall expressly assume, by an indenture supplemental hereto, executed
     and delivered to the Trustee, in form satisfactory to the Trustee, the
     Guarantee and the performance of every covenant of this Agreement on the
     part of the Guarantor to be performed or observed;

          (2) immediately after giving effect to such transaction, no Event of
     Default, and no event which, after notice or lapse of time or both, would
     become an Event of Default, shall have occurred and be continuing; and

          (3) the Guarantor has delivered to the Trustee an Officers'
     Certificate and an Opinion of Counsel, each stating that such
     consolidation, merger, conveyance, transfer or lease and, if an amendment
     to this Agreement is required in connection with such transaction, such
     amendment comply with this Article Three and that all conditions precedent
     herein provided for relating to such transaction have been complied with.

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     SECTION 3.02. Successor Corporation Substituted

     Upon any consolidation or merger by the Guarantor with or into any other
Person or any conveyance, transfer or lease of the properties and assets of the
Guarantor substantially as an entirety to any Person in accordance with Section
3.01, the successor corporation, partnership, limited liability company or trust
formed by such consolidation or into which the Guarantor is merged or to which
such conveyance, transfer or lease is made shall succeed to, and be substituted
for, and may exercise every right and power of, the Guarantor under this
Agreement with the same effect as if such successor corporation had been named
as the Guarantor herein, and thereafter, except in the case of a lease to
another Person, the predecessor corporation shall be relieved of all obligations
and covenants under this Agreement and the Guarantee.

     SECTION 3.03. Assignment to the Guarantor of the Company's Obligations

     It is acknowledged that, pursuant to Section 8.03 of the Indenture, the
Company may assign its obligations under any series of Securities and the
Indenture to the Guarantor or any Subsidiary of the Guarantor in accordance with
Section 8.03 and, if the Company assigns its obligations to the Guarantor in
accordance with Section 8.03 with respect to any series of Securities, all
Guarantees of outstanding Securities of such series shall automatically
terminate and be discharged.

                                  ARTICLE FOUR

                                   AMENDMENTS

     SECTION 4.01. Amendments Without Consent of Holders

     Without the consent of any Holders, the Guarantor, when authorized by a
Board Resolution, and the Trustee, at any time and from time to time, may enter
into one or more agreements, in form satisfactory to the Trustee, for any of the
following purposes:

          (1) to evidence the succession of another corporation to the Guarantor
     and the assumption by any such successor of the covenants of the Guarantor
     herein; or

          (2) to add to the covenants of the Guarantor for the benefit of the
     Holders of all or any series of Securities, or to surrender any right or
     power herein conferred upon the Guarantor; or

          (3) to secure the Securities; or

          (4) to cure any ambiguity, to correct or supplement any provision
     herein which may be inconsistent with any other provision herein, or to
     make any other provisions with respect to matters or questions arising
     under this Agreement; provided such action shall not adversely affect the
     interests of the Holders in any material respect.

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     SECTION 4.02. Amendments With Consent of Holders

     With the consent of the Holders of not less than a majority in principal
amount of the Securities at the time Outstanding of all series affected by such
amendment (each such series voting as a separate class), by Act of said Holders
delivered to the Guarantor and the Trustee, the Guarantor, when authorized by a
Board Resolution, and the Trustee may enter into an amendment to this Agreement
for the purpose of adding any provisions to or changing in any manner or
eliminating any of the provisions of this Agreement or of modifying in any
manner the rights of the Holders of Securities of such series under this
Agreement; provided, however, that no such amendment shall, without the consent
of the Holder of each outstanding Security affected thereby,

          (1) modify Article Two or the definitions used in Article Two in a
     manner which adversely affects the Holders of Outstanding Securities in any
     material respect, or

          (2) modify any of the provisions of this Section 4.02, except to
     increase any such percentage or to provide that certain other provisions of
     this Agreement cannot be modified or waived without the consent of the
     Holder of each Outstanding Security affected thereby.

     An amendment that changes or eliminates any covenant or other provision of
this Agreement which has expressly been included solely for the benefit of one
or more particular series of Securities, or that modifies the rights of the
Holders of Securities of such series with respect to such covenant or other
provision, shall be deemed not to affect the rights under this Agreement of the
Holders of Securities of any other series.

     It shall not be necessary for any Act of Holders under this Section 4.02 to
approve the particular form of any proposed amendment, but it shall be
sufficient if such Act shall approve the substance thereof.

     SECTION 4.03. Execution of Amendments

     In executing any amendment permitted by this Article Four, the Trustee
shall be entitled to receive, and shall be fully protected in relying upon, an
Opinion of Counsel stating that the execution of such amendment is authorized or
permitted by this Agreement. The Trustee may, but shall not be obligated to,
enter into any such amendment which affects the Trustee's own rights, duties or
immunities under this Agreement or otherwise.

     SECTION 4.04. Effect of Amendments

     Upon the execution of any amendment under this Article Four, this Agreement
shall be modified in accordance therewith, and such amendment shall form a part
of this Agreement for all purposes; and every Holder of Securities theretofore
or thereafter authenticated and delivered hereunder shall be bound thereby.

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     SECTION 4.05. Conformity With Trust Indenture Act

     Every amendment executed pursuant to this Article Four shall conform to the
requirements of the Trust Indenture Act as then in effect.

     SECTION 4.06. Reference in Guarantees to Amendments

     The Guarantees endorsed on Securities authenticated and delivered after the
execution of any amendment pursuant to this Article Four may, and shall, if
required by the Trustee, bear a notation in form approved by the Trustee as to
any matter provided for in such amendment. If the Guarantor shall so determine,
new Securities so modified as to conform, in the opinion of the Trustee and the
Board of Directors, to any such amendment may be prepared and executed by the
Guarantor and authenticated and delivered by the Trustee in exchange for
Outstanding Securities.

                                  ARTICLE FIVE

                                    COVENANTS

     SECTION 5.01. Money for Security Payments To Be Held in Trust

     If the Guarantor shall at any time act as Paying Agent with respect to any
series of Securities, it will, on or before each due date of the principal of
(or premium, if any) or interest, if any, on any of the securities of that
series, segregate and hold in trust for the benefit of the Persons entitled
thereto a sum sufficient to pay the principal (or premium, if any) or interest,
if any, so becoming due until such sums shall be paid to such Persons or
otherwise disposed of as herein provided and will promptly notify the Trustee of
its action or failure so to act.

     SECTION 5.02. Limitation on Liens

     The Guarantor will not itself, and will not permit any Restricted
Subsidiary to, incur, issue, assume or guarantee any Debt secured after the date
hereof by pledge of, or mortgage or lien on (herein referred to as "Lien"), any
Principal Property of the Guarantor or any Restricted Subsidiary or any shares
of Capital Stock of or Debt of any Restricted Subsidiary, without effectively
providing that the Securities (together with, if the Guarantor shall so
determine, any other Debt of the Guarantor or such Restricted Subsidiary then
existing or thereafter created which is not subordinate to the Securities) shall
be secured equally and ratably with (or, at the option of the Guarantor, prior
to) such secured Debt, so long as such secured Debt shall be so secured, unless,
after giving effect thereto, the aggregate amount of all such secured Debt of
the Guarantor and the Restricted Subsidiaries, would not at that time exceed 10%
of Consolidated Net Tangible Assets; provided, however, that this Section 10.04
shall not apply to, and there shall be excluded from secured Debt in any
computation under this Section 10.04, Debt secured by:

          (1) Liens on any property or any interest therein, construction
     thereon or improvement thereto to secure all or any part of the costs
     incurred after the date hereof for

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     surveying, exploration, drilling, mining or other extraction, development,
     construction, alteration, repair or improvement of, in, under or on such
     property or to secure Debt incurred to provide funds for any such purpose
     (it being understood that, in the case of oil, gas or mineral properties,
     or interests therein, costs incurred after the date hereof for
     "development" shall include costs incurred for all facilities relating to
     such properties or to projects, ventures or other arrangements of which
     such properties form a part or which relate to such properties or
     interests, which facilities may include, without limitation, any drilling
     equipment, production equipment and platforms or mining equipment,
     pipelines, pumping stations or other pipeline facilities; terminals or
     warehouses or storage facilities; bulk plants; production, separation,
     dehydration, extraction, treating and processing facilities; gasification
     or gas liquefying facilities, flares, stacks or burning towers; flotation
     mills, crushers and ore handling facilities; tank cars, tankers, barges,
     ships, trucks, automobiles, airplanes or other marine, automotive,
     aeronautical or other similar moveable facilities or equipment; computer
     systems and associated programs or office equipment; roads, airports and
     docks (including drydocks); reservoirs or waste disposal facilities;
     sewers, generating plants or electric lines; telephone and telegraph lines,
     radio and other communications facilities; townsites, housing facilities,
     recreation halls, stores and other related facilities; and similar
     facilities and equipment of or associated with any of the foregoing,
     whether or not in whole or in part located or from time to time located at
     or on such properties, projects, ventures or the situs of such other
     arrangements;

          (2) Liens or the creation of encumbrances on an oil and/or gas or
     mineral producing property to secure obligations incurred or guarantees of
     obligations incurred in connection with or necessarily incidental to
     commitments of purchase or sale of, or the transportation or distribution
     of, the products derived from such property;

          (3) Liens on drilling equipment, production equipment and platforms or
     mining equipment, pipelines, pumping stations or other pipeline facilities;
     terminals or warehouses or storage facilities; bulk plants; production,
     separation, dehydration, extraction, treating and processing facilities;
     gasification or gas liquefying facilities, flares, stacks or burning
     towers; flotation mills, crushers and ore handling facilities; tank cars,
     tankers, barges, ships, trucks, automobiles, airplanes or other marine,
     automotive, aeronautical or other similar moveable facilities or equipment;
     computer systems and associated programs or office equipment; roads,
     airports and docks (including drydocks); reservoirs or waste disposal
     facilities; sewers, generating plants or electric lines; telephone and
     telegraph lines, radio and other communications facilities; townsites,
     housing facilities, recreation halls, stores and other related facilities;
     real and personal property used primarily for purposes other than those of
     Principal Properties; and similar facilities and equipment of or associated
     with any of the foregoing, whether or not in whole or in part located or
     from time to time located at or on such properties, projects, ventures or
     the situs of such other arrangements;

          (4) Liens on property existing at the time of acquisition of such
     property or mortgages to secure the payment of all or any part of the
     purchase price of such property or to secure any Debt, incurred prior to,
     at the time of or within 24 months after the ac-

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                                      -9-

     quisition of such property for the purpose of financing all or any part of
     the purchase price thereof;

          (5) Liens (a) in favor of the United States of America or any State
     thereof, or any other country, or any municipality therein or any political
     subdivision, department, agency or instrumentality of any of them to secure
     moneys borrowed from or by such authorities, whether or not such moneys are
     borrowed or the repayment thereof is guaranteed by the Guarantor or by a
     Restricted Subsidiary, including, without limitation, Liens to secure Debt
     issued, assumed or guaranteed in pollution control or industrial revenue
     bond financings, or (b) to secure the performance of any covenant or
     obligation to or in favor of or entered into at the request of such
     authorities where such security is required pursuant to any contract,
     order, direction, regulation or statute;

          (6) Liens in existence prior to the date hereof;

          (7) Liens by any Restricted Subsidiary pursuant to the terms of any
     trust deed or similar document entered into by such Restricted Subsidiary,
     or by a predecessor of such Restricted Subsidiary, prior to the date when
     it became a Subsidiary;

          (8) Liens existing on any of the properties of, or on any shares of
     Capital Stock or Debt of, a corporation (including, but not limited to, a
     Restricted Subsidiary) at the time when such corporation becomes a
     Subsidiary or is consolidated with or merged into the Guarantor or a
     Subsidiary or Liens existing upon property, Capital Stock or Debt at the
     time of acquisition thereof;

          (9) Liens which secure only indebtedness owing by a Subsidiary to the
     Guarantor or by a Subsidiary or the Guarantor to a Subsidiary;

          (10) any extension, renewal or replacement (or successive extensions,
     renewals or replacements), as a whole or in part, of any Lien referred to
     in the foregoing clauses (1) to (9) inclusive, so long as such extension,
     renewal or replacement of such Lien is limited to all or any part of the
     same property, shares of Capital Stock or Debt that secured the Lien
     extended, renewed or replaced (plus improvements on such property);

          (11) pledges or deposits under workmen's compensation, unemployment
     insurance or similar statutes, mechanics', workmen's, repairmen's,
     materialmen's, carriers' or other similar Liens arising in the ordinary
     course of business or deposits or pledges to obtain the release of any such
     Liens;

          (12) Liens (a) created by or resulting from any litigation or other
     proceedings, including Liens arising out of judgments or awards against the
     Company or any Restricted Subsidiary, with respect to which the Guarantor
     or such Restricted Subsidiary is in good faith prosecuting an appeal or
     proceeding for review, or (b) incurred by the Guarantor or any Restricted
     Subsidiary for the purpose of obtaining a stay or discharge

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                                      -10-

     in the course of any legal proceeding to which the Guarantor or such
     Restricted Subsidiary is a party;

          (13) Liens for taxes or assessments or governmental charges or levies
     not yet due or delinquent, or which can thereafter be paid without penalty,
     or which are being contested in good faith by appropriate proceedings,
     landlord's Liens on property held under lease, and other Liens of a nature
     similar to those hereinabove described in this clause (13) which do not, in
     the opinion of the Guarantor or such Restricted Subsidiary, materially
     impair the use of such property in the operation of the business of the
     Guarantor or such Restricted Subsidiary or the value of such property for
     the purpose of such business;

          (14) easements, rights-of-way, restrictions and other similar charges
     or encumbrances not interfering with the ordinary conduct of the business
     of the Guarantor or any Restricted Subsidiary; and

          (15) Liens secured by pipeline assets of El Paso Natural Gas Company;

and provided, further, that the following types of transactions, among others,
shall not be deemed to create Debt secured by a Lien: the sale (including any
forward sale) or other transfer of (i) oil, gas, gold or other minerals, whether
in place or when produced, for a period of time until, or in an amount such
that, the purchaser will realize therefrom a specified amount of money (however
determined) or a specified amount of such minerals, or (ii) any other interest
in property of the character commonly referred to as a "production payment, "ore
payment", "royalty interest", "overriding royalty interest", or "mineral
payment", or farmouts, the creation of working interest, joint operating or
unitization agreements, or other similar transactions.

     SECTION 5.03. Waiver of Certain Covenants

     The Guarantor may omit in any particular instance to comply with any
covenant or condition set forth in Section 5.02 if, before or after the time for
such compliance, the Holders of at least a majority in principal amount of the
Outstanding Securities of each series shall, by notice to the Trustee, either
waive such compliance in such instance or generally waive compliance with such
covenant or condition, but no such waiver shall extend to or affect such
covenant or condition except to the extent so expressly waived, and, until such
waiver shall become effective, the obligations of the Guarantor and the duties
of the Trustee in respect of any such covenant or condition shall remain in full
force and effect.

     SECTION 5.04. Reports by Guarantor

     (a) The Guarantor shall file with the Trustee, within 15 days after the
Guarantor is required to file the same with the Commission, copies of the annual
reports and of the information, documents and other reports (or copies of such
portions of any of the foregoing as the Commission may from time to time by
rules and regulations prescribe) which the Guarantor is required to file with

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                                      -11-

the Commission pursuant to Section 13 or Section 15(d) of the Securities
Exchange Act of 1934, as amended and shall otherwise comply with Section 314(a)
of the Trust Indenture Act.

     (b) The Guarantor shall furnish to the Trustee, within 120 days after the
end of each fiscal year, a brief certificate from the principal executive
officer, principal financial officer or principal accounting officer as to his
or her knowledge of the Guarantor's compliance with all conditions and covenants
under this Agreement. For purposes of this paragraph (b), such compliance shall
be determined without regard to any period of grace or requirement of notice
provided under this Agreement.

                                   ARTICLE SIX

                                  MISCELLANEOUS

     SECTION 6.01. Trust Indenture Act

     The Guarantor understands that this Agreement is to be qualified under the
Trust Indenture Act and any provision of the Indenture required by the Trust
Indenture Act is hereby incorporated by reference. If any provision hereof
limits, qualifies or conflicts with another provision hereof which is required
to be included in this Agreement by any of the provisions of the Trust Indenture
Act, such required provision shall control. If any provision of this Agreement
modifies or excludes any provision of the Trust Indenture Act that may be so
modified or excluded, the latter provision shall be deemed to apply to this
Agreement as so modified or to be excluded, as the case may be.

     SECTION 6.02. Effect of Headings and Table of Contents

     The Article and Section headings herein are for convenience only and shall
not affect the construction hereof.

     SECTION 6.03. Successors and Assigns

     All covenants and agreements in this Agreement by the Guarantor shall bind
its successors and assigns, whether so expressed or not.

     SECTION 6.04. Separability Clause

     In case any provision in this Agreement or in the Guarantee shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

     SECTION 6.05. Benefits of Agreement

     Nothing in this Agreement or in the Guarantee, express or implied, shall
give to any Person, other the Guarantor and its successors hereunder and the
Holders of Securities, any benefit or any legal or equitable right, remedy or
claim under this Agreement.

<PAGE>
                                      -12-

     SECTION 6.06. Governing Law

     This Agreement and the Guarantee shall be governed by and construed in
accordance with the laws of the State of New York.

     SECTION 6.07. Notices, Etc., to the Guarantor

     Any request, demand, authorization, direction, notice, consent, waiver or
Act of Holders or other document provided or permitted by this Agreement to be
made upon, given or furnished to, or filed with the Guarantor by the Trustee or
by any Holder shall be sufficient for every purpose hereunder (unless otherwise
herein expressly provided) if in writing and mailed, first-class postage
prepaid, to the Guarantor addressed to it at the address of its principal office
specified in the first paragraph of this Agreement or at any other address
previously furnished in writing to the Trustee by the Guarantor, Attention:
Assistant Treasurer.

<PAGE>

     IN WITNESS WHEREOF, the Guarantor has duty executed this Agreement as of
the date first above written.

                            BURLINGTON RESOURCES INC., as Guarantor

                            By:    /s/ Daniel Hawk
                                   ---------------------------------------------
                                   Name:   Daniel Hawk
                                   Title:  Vice President and Treasurer

Agreed and Accepted:

CITIBANK, N.A., as Trustee
    under the Indenture

By:    /s/ Pat DeFelice
       ----------------------------------------------
       Name:   Pat DeFelice
       Title:  Vice President

<PAGE>Exhibit 4.6

EXECUTION COPY

                      BURLINGTON RESOURCES FINANCE COMPANY

                        $500,000,000 5.60% Notes due 2006
                        $500,000,000 6.50% Notes due 2011
                        $500,000,000 7.40% Notes due 2031

                               Purchase Agreement
       (Fully and Unconditionally Guaranteed by Burlington Resources Inc.)

         New York, New York
         November 8, 2001

Merrill Lynch, Pierce, Fenner & Smith
  Incorporated
Morgan Stanley & Co. Incorporated
As Representatives of the Initial Purchasers
c/o Michele E. Taub, Esq.
Merrill Lynch, Pierce, Fenner & Smith
  Incorporated
4 World Financial Center
New York, New York 10080

Ladies and Gentlemen:

     Burlington Resources Finance Company, a Nova Scotia unlimited liability
company (the "Company"), proposes to issue and sell to the several parties named
in Schedule I hereto (the "Initial Purchasers"), for whom you (the
"Representatives") are acting as representatives, $500,000,000 principal amount
of its 5.60% Notes due 2006, $500,000,000 principal amount of its 6.50% Notes
due 2011 and $500,000,000 principal amount of its 7.40% Notes due 2031
(together, the "Securities") to be guaranteed by Burlington Resources Inc. (the
"Guarantor"). The Securities are to be issued under an indenture (the
"Indenture") dated as of February 12, 2001, between the Company and Citibank,
N.A., as trustee (the "Trustee"). The Securities have the benefit of the
Registration Rights Agreement (the "Registration Rights Agreement"), dated as of
November 16, 2001, between the Company and the Initial

<PAGE>

Purchasers, pursuant to which the Company has agreed to register the Securities
under the Act subject to the terms and conditions therein specified. To the
extent there are no additional parties listed on Schedule I other than you, the
term Representatives as used herein shall mean you as the Initial Purchasers,
and the terms Representatives and Initial Purchasers shall mean either the
singular or plural as the context requires. The use of the neuter in this
Agreement shall include the feminine and masculine wherever appropriate. Certain
terms used herein are defined in Section 17 hereof.

     The sale of the Securities to the Initial Purchasers will be made without
registration of the Securities under the Act in reliance upon exemptions from
the registration requirements of the Act.

     In connection with the sale of the Securities, the Company has prepared a
preliminary offering memorandum, dated November 7, 2001 (as amended or
supplemented at the Execution Time, including any and all exhibits thereto and
any information incorporated by reference therein, the "Preliminary
Memorandum"), and a final offering memorandum, dated November 8, 2001 (as
amended or supplemented at the Execution Time, including any and all exhibits
thereto and any information incorporated by reference therein, the "Final
Memorandum"). Each of the Preliminary Memorandum and the Final Memorandum sets
forth certain information concerning the Company and the Securities. The Company
hereby confirms that it has authorized the use of the Preliminary Memorandum and
the Final Memorandum, and any amendment or supplement thereto, in connection
with the offer and sale of the Securities by the Initial Purchasers. Unless
stated to the contrary, any references herein to the terms "amend", "amendment"
or "supplement" with respect to the Final Memorandum shall be deemed to refer to
and include any information filed under the Exchange Act subsequent to the
Execution Time which is incorporated by reference therein.

     1. Representations and Warranties. The Company represents and warrants to
each Initial Purchaser as set forth below in this Section 1.

          (a) The Preliminary Memorandum, at the date thereof, did not contain
     any untrue statement of a material fact or omit to state any material fact
     necessary to make the statements therein, in the light of the circumstances
     under which they were made, not misleading. At the Execution Time and on
     the Closing Date, the Final Memorandum did not, and will not (and any
     amendment or supplement thereto, at the date thereof and at the Closing
     Date, will not), contain any untrue statement of a material fact or omit to
     state any material fact necessary to make the statements therein, in the
     light of the circumstances under which they were made, not misleading;
     provided, however, that the Company makes no representation or warranty as
     to the information

                                      -2-
<PAGE>

     contained in or omitted from the Preliminary Memorandum or the Final
     Memorandum, or any amendment or supplement thereto, in reliance upon and in
     conformity with information furnished in writing to the Company by or on
     behalf of the Initial Purchasers through the Representatives specifically
     for inclusion therein.

          (b) Neither the Company, nor any of its Affiliates, nor any person
     acting on its or their behalf has, directly or indirectly, made offers or
     sales of any security, or solicited offers to buy any security, under
     circumstances that would require the registration of the Securities under
     the Act.

          (c) Neither the Company, nor any of its Affiliates, nor any person
     acting on its or their behalf has engaged in any form of general
     solicitation or general advertising (within the meaning of Regulation D) in
     connection with any offer or sale of the Securities in the United States.

          (d) The Securities satisfy the eligibility requirements of Rule
     144A(d)(3) under the Act.

          (e) Neither the Company, nor any of its Affiliates, nor any person
     acting on its or their behalf has engaged in any directed selling efforts
     with respect to the Securities, and each of them has complied with the
     offering restrictions requirement of Regulation S. Terms used in this
     paragraph have the meanings given to them by Regulation S.

          (f) The Company has not paid or agreed to pay to any person any
     compensation for soliciting another to purchase any securities of the
     Company (except as contemplated by this Agreement).

          (g) The Company has not taken, directly or indirectly, any action
     designed to cause or which has constituted or which might reasonably be
     expected to cause or result, under the Exchange Act or otherwise, in the
     stabilization or manipulation of the price of any security of the Company
     to facilitate the sale or resale of the Securities.

          (h) The information provided by the Company pursuant to Section 5(h)
     hereof will not, at the date thereof, contain any untrue statement of a
     material fact or omit to state any material fact necessary to make the
     statements therein, in the light of the circumstances under which they were
     made, not misleading.

          (i) The Company is an unlimited liability company duly organized,
     validly existing and in good standing under the laws of Nova Scotia,
     Canada, has the corpo-

                                      -3-
<PAGE>

     rate power and authority to own its property and to conduct its business as
     described in the Final Memorandum and is duly qualified to transact
     business and is in good standing in each jurisdiction in which the conduct
     of its business or its ownership or leasing of property requires such
     qualification, except to the extent that the failure to be so qualified or
     be in good standing would not have a material adverse effect on the Company
     and its subsidiaries, taken as a whole.

          (j) Each subsidiary of the Company, if any, has been duly
     incorporated, is validly existing as a corporation in good standing under
     the laws of the jurisdiction of its incorporation, has the corporate power
     and authority to own its property and to conduct its business as described
     in the Final Memorandum and is duly qualified to transact business and is
     in good standing in each jurisdiction in which the conduct of its business
     or its ownership or leasing of property requires such qualification, except
     to the extent that the failure to be so qualified or be in good standing
     would not have a material adverse effect on the Company and its
     subsidiaries, taken as a whole.

          (k) This Agreement has been duly authorized, executed and delivered by
     the Company, as principal and not as agent.

          (l) The Indenture has been duly qualified under the Trust Indenture
     Act and the Indenture and the Registration Rights Agreement have been duly
     authorized, executed and delivered by the Company, as principal and not as
     agent, and are valid and binding agreements of the Company, enforceable in
     accordance with their terms except as (i) the enforceability thereof may be
     limited by bankruptcy, insolvency or similar laws affecting creditors'
     rights generally, (ii) rights of acceleration and the availability of
     equitable remedies may be limited by equitable principles of general
     applicability and (iii) rights to indemnification and contribution under
     the Registration Rights Agreement may be limited under applicable law or
     public policy considerations.

          (m) The Securities have been duly authorized by the Company, as
     principal and not as agent, and, when executed and authenticated in
     accordance with the provisions of the Indenture and delivered to and paid
     for by the Initial Purchasers in accordance with this Agreement, will be
     entitled to the benefits of the Indenture and will be valid and binding
     obligations of the Company, in each case enforceable in accordance with
     their respective terms except as (i) the enforceability thereof may be
     limited by bankruptcy, insolvency or similar laws affecting creditors'
     rights generally and (ii) rights of acceleration and the availability of
     equitable remedies may be limited by equitable principles of general
     applicability.

                                      -4-
<PAGE>

          (n) The execution and delivery by the Company of, and the performance
     by the Company of its obligations under, this Agreement, the Indenture, the
     Registration Rights Agreement and the Securities will not contravene any
     provision of applicable law or the certificate of incorporation or by-laws
     (or other equivalent organizational document) of the Company or any
     agreement or other instrument binding upon the Company or any of its
     subsidiaries or affiliates that is material to the Company and its
     subsidiaries, taken as a whole, or any judgment or decree of any
     governmental agency or court having jurisdiction over the Company or any
     subsidiary, and no consent, approval, authorization or order of or
     qualification with any governmental body or agency is required for the
     performance by the Company of its obligations under this Agreement, the
     Indenture, the Registration Rights Agreement or the Securities, except such
     as may be required by the securities or Blue Sky laws of the various states
     in connection with the offer and sale of the Securities.

          (o) There has not occurred any material adverse change in, or any
     adverse development which materially affects, the condition, financial or
     otherwise, or the earnings, business or operations of the Company and its
     subsidiaries, taken as a whole, from that set forth in the Final
     Memorandum.

          (p) All descriptions in the Final Memorandum of statutes, regulations,
     legal or governmental proceedings, contracts and other documents are
     accurate in all material respects and fairly present in all material
     respects the information required to be shown.

          (q) The Company is not, nor is it directly or indirectly controlled by
     or acting on behalf of any person which is, (i) an "investment company"
     within the meaning of the Investment Company Act of 1940, as amended, and
     the rules and regulations promulgated by the Commission thereunder or (ii)
     a "holding company" within the meaning of, or subject to regulation under,
     the Public Utility Holding Company Act of 1935, as amended, and the rules
     and regulations promulgated by the Commission thereunder.

     Any certificate signed by any officer of the Company and delivered to the
Representatives or counsel for the Initial Purchasers in connection with the
offering of the Securities shall be deemed a representation and warranty by the
Company, as to matters covered thereby, to each Initial Purchaser.

     2. Issuance of Notes. Subject to the terms and conditions set forth or
incorporated by reference herein, the Company hereby agrees to sell and the
Initial Purchasers agree

                                      -5-
<PAGE>

to purchase the Securities at a purchase price equal to 99.984% of the principal
amount of the 2006 Notes, 99.719% of the principal amount of the 2011 Notes and
99.862% of the principal amount of the 2031 Notes, plus accrued interest, if
any, from November 16, 2001, to the date of payment and delivery. As
compensation to the Initial Purchasers for their services and commitments
hereunder in relation to the issuance of the Notes, the Company hereby agrees to
pay to the Initial Purchasers a commission of .600% of the principal amount of
the 2006 Notes, a commission of .650% of the principal amount of the 2011 Notes,
and a commission of .875% of the principal amount of the 2031 Notes.

     3. Delivery and Payment. Delivery of and payment for the Securities shall
be made at 10:00 A.M., New York City time, on November 16, 2001, or at such time
on such later date (not later than November 19, 2001) as the Representatives
shall designate, which date and time may be postponed by agreement between the
Representatives and the Company or as provided in Section 9 hereof (such date
and time of delivery and payment for the Securities being herein called the
"Closing Date"). Delivery of the Securities shall be made to the Representatives
for the respective accounts of the several Initial Purchasers against payment by
the several Initial Purchasers through the Representatives of the purchase price
thereof to or upon the order of the Company by wire transfer payable in same-day
funds to the account specified by the Company. Delivery of the Securities shall
be made through the facilities of The Depository Trust Company unless the
Representatives shall otherwise instruct.

     4. Offering by Initial Purchasers. Each Initial Purchaser, severally and
not jointly, represents and warrants to and agrees with the Company that:

          (a) It has not offered or sold, and will not offer or sell, any
     Securities except (i) to those it reasonably believes to be qualified
     institutional buyers (as defined in Rule 144A under the Act) and that, in
     connection with each such sale, it has taken or will take reasonable steps
     to ensure that the purchaser of such Securities is aware that such sale is
     being made in reliance on Rule 144A; or (ii) in accordance with the
     restrictions set forth in Exhibit B hereto.

          (b) Neither it nor any person acting on its behalf has made or will
     make offers or sales of the Securities in the United States by means of any
     form of general solicitation or general advertising (within the meaning of
     Regulation D) in the United States.

     5. Agreements. The Company agrees with each Initial Purchaser that:

                                      -6-
<PAGE>

          (a) The Company will furnish to each Initial Purchaser and to counsel
     for the Initial Purchasers, without charge, during the period referred to
     in paragraph (c) below, as many copies of the Final Memorandum and any
     amendments and supplements thereto as it may reasonably request.

          (b) The Company will not amend or supplement the Final Memorandum,
     other than by filing documents under the Exchange Act that are incorporated
     by reference therein, without the prior consent of the Representatives;
     provided, however, that, prior to the completion of the distribution of the
     Securities by the Initial Purchasers (as determined by the Initial
     Purchasers), the Company will not file any document under the Exchange Act
     that is incorporated by reference in the Final Memorandum unless, prior to
     such proposed filing, the Company has furnished the Representatives with a
     copy of such document for their review and the Representatives have not
     reasonably objected to the filing of such document.

          (c) If at any time prior to the completion of the sale of the
     Securities by the Initial Purchasers (as determined by the
     Representatives), any event shall occur or condition exist as a result of
     which it is necessary to amend or supplement the Final Memorandum in order
     to make the statements therein, in the light of the circumstances when the
     Final Memorandum is delivered to a purchaser, not misleading, or if, in the
     opinion of counsel for the Representatives, it is necessary to amend or
     supplement the Final Memorandum to comply with law, forthwith (subject to
     the requirements of paragraph (b) of this Section 5) the Company will
     prepare and furnish, at its own expense, to the several Initial Purchasers
     and counsel for the Initial Purchasers without charge in such quantities as
     you may reasonably request either amendments or supplements to the Final
     Memorandum so that the statements in the Final Memorandum as so amended or
     supplemented will not, in the light of the circumstances when the Final
     Memorandum is delivered to a purchaser, be misleading or so that the Final
     Memorandum, as so amended or supplemented, will comply with law.

          (d) The Company will endeavor to qualify, if necessary, the Securities
     for offer and sale under the securities or Blue Sky laws of such
     jurisdictions as the Initial Purchasers shall reasonably request and to pay
     all reasonable expenses (including reasonable fees and disbursements of
     counsel) in connection with such qualification and in connection with the
     determination of the eligibility of the Securities for investment under the
     laws of such jurisdictions as the Initial Purchasers may designate;
     provided that in no event shall the Company be obligated to qualify to do
     business in any jurisdiction where it is not now so qualified or to take
     any action that would subject it to

                                      -7-
<PAGE>

     service of process in suits, other than those arising out of the offering
     or sale of the securities in any jurisdiction where it is now so subject.

          (e) The Company will not, and will not permit any of its Affiliates
     to, resell any Securities that have been acquired by any of them.

          (f) Neither the Company, nor any of its Affiliates, nor any person
     acting on its or their behalf will, directly or indirectly, make offers or
     sales of any security, or solicit offers to buy any security, under
     circumstances that would require the registration of the Securities under
     the Act.

          (g) Neither the Company, nor any of its Affiliates, nor any person
     acting on its or their behalf will engage in any form of general
     solicitation or general advertising (within the meaning of Regulation D) in
     connection with any offer or sale of the Securities in the United States.

          (h) So long as any of the Securities are "restricted securities"
     within the meaning of Rule 144(a)(3) under the Act, the Company will,
     during any period in which it is not subject to and in compliance with
     Section 13 or 15(d) of the Exchange Act or it is not exempt from such
     reporting requirements pursuant to and in compliance with Rule 12g3-2(b)
     under the Exchange Act, provide to each holder of such restricted
     securities and to each prospective purchaser (as designated by such holder)
     of such restricted securities, upon the request of such holder or
     prospective purchaser, any information required to be provided by Rule
     144A(d)(4) under the Act. This covenant is intended to be for the benefit
     of the holders, and the prospective purchasers designated by such holders,
     from time to time of such restricted securities.

          (i) Neither the Company, nor any of its Affiliates, nor any person
     acting on its or their behalf will engage in any directed selling efforts
     with respect to the Securities, and each of them will comply with the
     offering restrictions requirement of Regulation S. Terms used in this
     paragraph have the meanings given to them by Regulation S.

          (j) The Company will cooperate with the Representatives and use
     commercially reasonable efforts to permit the Securities to be eligible for
     clearance and settlement through The Depository Trust Company.

          (k) During the period beginning on the date of this Agreement and
     continuing to and including the Closing Date, the Company will not offer,
     sell, contract to sell or otherwise dispose of any debt securities of the
     Company substantially similar to the

                                      -8-
<PAGE>

     Securities (other than the Securities) without the prior written consent of
     the Representatives.

          (l) The Company will not take, directly or indirectly, any action
     designed to or which has constituted or which might reasonably be expected
     to cause or result, under the Exchange Act or otherwise, in stabilization
     or manipulation of the price of any security of the Company to facilitate
     the sale or resale of the Securities.

          (m) The Company agrees to pay the costs and expenses relating to the
     following matters: (i) the issuance of the Securities and the fees of the
     Trustee; (ii) the preparation, printing or reproduction of the Preliminary
     Memorandum and Final Memorandum and each amendment or supplement to either
     of them; (iii) the printing (or reproduction) and delivery (including
     postage, air freight charges and charges for counting and packaging) of
     such copies of the Preliminary Memorandum and Final Memorandum, and all
     amendments or supplements to either of them, as may, in each case, be
     reasonably requested for use in connection with the offering and sale of
     the Securities; (iv) the preparation, printing, authentication, issuance
     and delivery of certificates for the Securities, including any stamp or
     transfer taxes in connection with the original issuance and sale of the
     Securities; (v) the transportation and other expenses incurred by or on
     behalf of Company representatives in connection with presentations to
     prospective purchasers of the Securities; (vi) the fees and expenses of the
     Company's accountants and the fees and expenses of counsel (including local
     and special counsel) for the Company; and (vii) all other costs and
     expenses incident to the performance by the Company of its obligations
     hereunder.

     6. Conditions to the Obligations of the Initial Purchasers. The obligations
of the Initial Purchasers to purchase the Securities shall be subject to the
accuracy of the representations and warranties on the part of the Company
contained herein at the Execution Time and the Closing Date, to the accuracy of
the statements of the Company made in any certificates pursuant to the
provisions hereof, to the performance by the Company of its obligations
hereunder and to the following additional conditions:

          (a) The Representatives shall have received on the Closing Date (i)
     opinions of Cahill Gordon & Reindel, special U.S. counsel to the Guarantor,
     and Bennett Jones LLP, special Canadian counsel to the Company, addressing
     the matters set forth in paragraphs (i), (ii)(a), (iv), (v), (vi), (vii),
     (viii), (ix), (x), (xi)(a), (xii)(b), (xiii), (xiv)(b), (xv), (xvi),
     (xvii), (xviii) and (xix) of Exhibit A attached hereto, and (ii) an opinion
     of the Vice President and General Counsel of the Guarantor and the Company,

                                      -9-
<PAGE>

     addressing the matters set forth in paragraphs (ii)(b), (iii), (x), (xi)
     (item (b)), (xii)(a) and (xiv)(a) of Exhibit A.

          (b) The Representatives shall have received from Cravath, Swaine &
     Moore, counsel for the Initial Purchasers, such opinion or opinions, dated
     the Closing Date and addressed to the Representatives, with respect to the
     issuance and sale of the Securities, the Indenture, the Registration Rights
     Agreement, the Final Memorandum (as amended or supplemented at the Closing
     Date) and other related matters as the Representatives may reasonably
     require, and the Company and Guarantor shall have furnished to such counsel
     such documents as they request for the purpose of enabling them to pass
     upon such matters.

          (c) Subsequent to the execution and delivery of the Purchase Agreement
     and prior to the Closing Date,

               (i) there shall not have occurred any downgrading, nor shall any
          notice have been given of any intended or potential downgrading or of
          any review for a possible change that does not indicate the direction
          of the possible change, in the rating accorded any of the Guarantor's
          securities by any "nationally recognized statistical rating
          organization", as such term is defined for purposes of Rule 436(g)(2)
          under the Securities Act; and

               (ii) there shall not have occurred any change, or any development
          involving a prospective change, in the condition, financial or
          otherwise, or in the earnings, business or operations, of the
          Guarantor and its subsidiaries, taken as a whole, from that set forth
          in the Final Memorandum that, in the judgment of the Representatives,
          is material and adverse and that makes it, in the judgment of the
          Representatives, impracticable to market the Securities on the terms
          and in the manner contemplated in the Final Memorandum.

          (d) The Representatives shall have received on the Closing Date a
     certificate, dated the Closing Date and signed by an executive officer of
     the Company, to the effect set forth in clause (c)(i) above and to the
     effect that the representations and warranties of the Company contained in
     this Agreement are true and correct as of the Closing Date and that the
     Company has complied with all the agreements and satisfied all the
     conditions on its part to be performed or satisfied on or before the
     Closing Date.

          The officer signing and delivering such certificate may rely upon the
     best of his knowledge as to proceedings threatened.

                                      -10-
<PAGE>

          (e) The Representatives shall have received on each of the date hereof
     and the Closing Date a letter, dated such date, in form and substance
     reasonably satisfactory to the Representatives, from PricewaterhouseCoopers
     LLP, independent accountants for the Company, containing statements and
     information of the type ordinarily included in accountants' "comfort
     letters" with respect to the financial statements and certain financial
     information contained in or incorporated by reference into the Final
     Memorandum.

          References to the Final Memorandum in this Section 6(e) include any
     amendment or supplement thereto at the date of the applicable letter.

          (f) The Representatives shall have received (i) on the date of this
     Agreement, a guarantee in the form of Exhibit C (the "Purchase Agreement
     Guarantee") executed by the Guarantor and (ii) on the Closing Date, a
     certificate, dated the Closing Date and signed by an executive officer of
     the Guarantor, to the effect that the representations and warranties of the
     Guarantor contained in the Purchase Agreement Guarantee are true and
     correct as of the Closing Date and that the Guarantor has complied with,
     and satisfied all, the conditions to be performed or satisfied by it on or
     before the Closing Date.

          (g) The Representatives shall have received on the Closing Date a
     guarantee agreement (the "Securities Guarantee"), in form attached as
     Exhibit A of the Indenture, under which the Guarantor agrees to irrevocably
     and unconditionally guarantee all the Company's obligations under the
     Indenture in respect of the Securities.

          (h) The Representatives shall have received on the Closing Date a
     registration rights agreement (the "Registration Rights Agreement"), in
     form and substance satisfactory to the Representatives, executed by the
     Company and the Guarantor.

     If any of the conditions specified in this Section 6 shall not have been
fulfilled in all material respects when and as provided in this Agreement, or if
any of the opinions and certificates mentioned above or elsewhere in this
Agreement shall not be in all material respects reasonably satisfactory in form
and substance to the Representatives and counsel for the Initial Purchasers,
this Agreement and all obligations of the Initial Purchasers hereunder may be
cancelled at, or at any time prior to, the Closing Date by the Representatives.
Notice of such cancellation shall be given to the Company in writing or by
telephone or facsimile confirmed in writing.

                                      -11-
<PAGE>

     The documents required to be delivered by this Section 6 will be delivered
at the office of counsel for the Initial Purchasers, at 825 Eighth Avenue, New
York, New York 10019, on the Closing Date.

     7. Reimbursement of Expenses. If the sale of the Securities provided for
herein is not consummated because any condition to the obligations of the
Initial Purchasers set forth in Section 6 hereto is not satisfied, because of
any termination pursuant to Section 10(a)(ii) hereof at a time when Section
10(a)(i) hereof is not simultaneously applicable or because of any refusal,
inability or failure on the part of the Company to perform any agreement herein
or comply with any provision hereof other than by reason of a default by any of
the Initial Purchasers, the Company will reimburse the Initial Purchasers
severally through the Representatives on demand for all reasonable out-of-pocket
expenses (including reasonable fees and disbursements of counsel) that shall
have been incurred by them in connection with the proposed purchase and sale of
the Securities.

     8. Indemnification and Contribution. (a) The Company agrees to indemnify
and hold harmless each Initial Purchaser, the directors, officers, employees and
agents of each Initial Purchaser and each person, if any, who controls such
Initial Purchaser within the meaning of either Section 15 of the Act or Section
20 of the Exchange Act from and against any and all losses, claims, damages and
liabilities, joint or several, to which they or any of them may become subject
under the Act, the Exchange Act or other Federal or state statutory law or
regulation, at common law or otherwise (including, without limitation, any legal
or other expenses reasonably incurred by any Initial Purchaser or any such
director, officer, employee, agent or controlling person in connection with
defending or investigating any such action or claim) insofar as such losses,
claims, damages or liabilities arise out of or are based upon any untrue
statement or alleged untrue statement of a material fact contained in the
Preliminary Memorandum, the Final Memorandum (or in any supplement or amendment
thereto) or any information provided by the Company to any holder or prospective
purchaser of Securities pursuant to Section 5(h), or in any amendment thereof or
supplement thereto, or caused by any omission or alleged omission to state
therein a material fact required to be stated therein or necessary to make the
statements therein not misleading, except insofar as such losses, claims,
damages or liabilities are caused by any such untrue statement or omission or
alleged untrue statement or omission based upon information relating to any
Initial Purchaser furnished to the Company in writing by such Initial Purchaser
through the Representatives expressly for use therein.

     (b) Each Initial Purchaser agrees, severally and not jointly, to indemnify
and hold harmless the Company, its directors, officers, employees and agents,
and each person, if any, who controls the Company within the meaning of either
Section 15 of the Act or Section

                                      -12-
<PAGE>

20 of the Exchange Act to the same extent as the foregoing indemnity from the
Company to such Initial Purchaser, but only with reference to written
information relating to such Initial Purchaser furnished to the Company by such
Initial Purchaser in writing through the Representatives expressly for use in
the Preliminary Memorandum or the Final Memorandum or any amendments or
supplements thereto. The Company acknowledges that the statements set forth in
the Preliminary Memorandum and the Final Memorandum constitute the only
information furnished in writing by or on behalf of the Initial Purchasers for
inclusion in the Preliminary Memorandum or the Final Memorandum (or in any
amendment or supplement thereto).

     (c) In case any proceeding (including any governmental investigation) shall
be instituted involving any person in respect of which indemnity may be sought
pursuant to either of the two preceding paragraphs, such person (the
"indemnified party") shall promptly notify the person against whom such
indemnity may be sought (the "indemnifying party") in writing and the
indemnifying party, upon request of the indemnified party, shall retain counsel
reasonably satisfactory to the indemnified party to represent the indemnified
party and any others the indemnifying party may designate in such proceeding and
shall pay the fees and disbursements of such counsel related to such proceeding.
In any such proceeding, any indemnified party shall have the right to retain its
own counsel, but the fees and expenses of such counsel shall be at the expense
of such indemnified party unless (i) the indemnifying party and the indemnified
party shall have mutually agreed to the retention of such counsel or (ii) the
named parties to any such proceeding (including any impleaded parties) include
both the indemnifying party and the indemnified party and representation of both
parties by the same counsel would be inappropriate due to actual or potential
differing interests between them. It is understood that the indemnifying party
shall not, in respect of the legal expenses of any indemnified party in
connection with any proceeding or related proceedings in the same jurisdiction,
be liable for the fees and expenses of more than one separate firm (in addition
to any local counsel) for all such indemnified parties and that all such fees
and expenses shall be reimbursed as they are incurred. Such firm shall be
designated in writing by the Representatives, in the case of parties indemnified
pursuant to the second preceding paragraph, and by the Company, in the case of
parties indemnified pursuant to the first preceding paragraph. The indemnifying
party shall not be liable for any settlement of any proceeding effected without
its written consent, but if settled with such consent or if there be a final
judgment for the plaintiff, the indemnifying party agrees to indemnify the
indemnified party from and against any loss or liability by reason of such
settlement or judgment. Notwithstanding the foregoing sentence, if at any time
an indemnified party shall have requested an indemnifying party to reimburse the
indemnified party for fees and expenses of counsel as contemplated by the third
sentence of this paragraph, the indemnifying party agrees that it shall be
liable for any settlement of any proceeding effected without its written consent
if (i) such set-

                                      -13-
<PAGE>

tlement is entered into more than 30 days after receipt by such indemnifying
party of the aforesaid request and (ii) such indemnifying party shall not have
reimbursed the indemnified party in accordance with such request prior to the
date of such settlement. No indemnifying party shall, without the prior written
consent of the indemnified party, effect any settlement of any pending or
threatened proceeding in respect of which any indemnified party is or could have
been a party and indemnity could have been sought hereunder by such indemnified
party, unless such settlement includes an unconditional release of such
indemnified party from all liability on claims that are the subject matter of
such proceeding.

     (d) If the indemnification provided for in paragraph (a) or (b) in this
Section 8 is unavailable to an indemnified party or insufficient in respect of
any losses, claims, damages or liabilities referred to therein, then each
indemnifying party under such paragraph, in lieu of indemnifying such
indemnified party thereunder, shall contribute to the amount paid or payable by
such indemnified party as a result of such losses, claims, damages or
liabilities (i) in such proportion as is appropriate to reflect the relative
benefits received by the Company on the one hand and the Initial Purchasers on
the other hand from the offering of the Securities or (ii) if the allocation
provided by clause (i) above is not permitted by applicable law, in such
proportion as is appropriate to reflect not only the relative benefits referred
to in clause (i) above but also the relative fault of the Company on the one
hand and of the Initial Purchasers on the other hand in connection with the
statements or omissions that resulted in such losses, claims, damages or
liabilities, as well as any other relevant equitable considerations. The
relative benefits received by the Company on the one hand and the Initial
Purchasers on the other hand in connection with the offering of the Securities
shall be deemed to be in the same respective proportions as the net proceeds
from the offering of such Securities (before deducting expenses) received by the
Company and the total discounts and commissions received by the Initial
Purchasers bear to the aggregate offering price of the Securities. The relative
fault of the Company on the one hand and of the Initial Purchasers on the other
hand shall be determined by reference to, among other things, whether the untrue
or alleged untrue statement of a material fact or the omission or alleged
omission to state a material fact relates to information supplied by the Company
or by the Initial Purchasers and the parties' relative intent, knowledge, access
to information and opportunity to correct or prevent such statement or omission.
The Initial Purchasers' respective obligations to contribute pursuant to this
Section 8(d) are several in proportion to the respective principal amounts of
Securities purchased by each of such Initial Purchasers and not joint. The
Company and the Initial Purchasers agree that it would not be just or equitable
if contribution pursuant to this Section 8(d) were determined by pro rata
allocation (even if the Initial Purchasers were treated as one entity for such
purpose) or by any other method of allocation that does not take account of the
equitable considerations referred to in this paragraph (d). The amount paid or
payable by an indemnified party as a result of the losses, claims, damages and
liabilities referred to in this paragraph (d)

                                      -14-
<PAGE>

shall be deemed to include, subject to the limitations set forth above, any
legal or other expenses reasonably incurred by such indemnified party in
connection with investigating or defending any such action or claim.
Notwithstanding the provisions of this Section 8(d), no Initial Purchaser shall
be required to contribute any amount in excess of the amount by which the total
price at which the Securities sold by it exceeds the amount of any damages that
such Initial Purchaser has otherwise been required to pay by reason of such
untrue or alleged untrue statement or omission or alleged omission. No person
guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of
the Act) shall be entitled to contribution from any person who was not guilty of
such fraudulent misrepresentation. The remedies provided for in this Section 8
are not exclusive and shall not limit any rights or remedies which may otherwise
be available to any indemnified party at law or in equity.

     (e) The indemnity and contribution provisions contained in this Section 8
and the representations and warranties of the Company contained herein shall
remain operative and in full force and effect regardless of (i) any termination
of this Agreement, (ii) any investigation made by or on behalf of any Initial
Purchaser or any person controlling any Initial Purchaser or by or on behalf of
the Company, its directors or officers or any person controlling the Company and
(iii) acceptance of and payment for any of the Securities.

     9. Default by an Initial Purchaser. If any one or more Initial Purchasers
shall fail to purchase and pay for any of the Securities agreed to be purchased
by such Initial Purchaser hereunder and such failure to purchase shall
constitute a default in the performance of its or their obligations under this
Agreement, the remaining Initial Purchasers shall be obligated severally to take
up and pay for (in the respective proportions which the amount of Securities set
forth opposite their names in Schedule I hereto bears to the aggregate amount of
Securities set forth opposite the names of all the remaining Initial Purchasers)
the Securities which the defaulting Initial Purchaser or Initial Purchasers
agreed but failed to purchase; provided, however, that in the event that the
aggregate amount of Securities which the defaulting Initial Purchaser or Initial
Purchasers agreed but failed to purchase shall exceed 10% of the aggregate
amount of Securities set forth in Schedule I hereto, the remaining Initial
Purchasers shall have the right to purchase all, but shall not be under any
obligation to purchase any, of the Securities, and if such nondefaulting Initial
Purchasers do not purchase all the Securities, this Agreement will terminate
without liability to any nondefaulting Initial Purchaser or the Company. In the
event of a default by any Initial Purchaser as set forth in this Section 9, the
Closing Date shall be postponed for such period, not exceeding five Business
Days (but not later than November 19, 2001), as the Representatives shall
determine in order that the required changes in the Final Memorandum or in any
other documents or arrangements may be effected. Nothing contained in this
Agreement shall relieve any defaulting Initial Purchaser of

                                      -15-
<PAGE>

its liability, if any, to the Company or any nondefaulting Initial Purchaser for
damages occasioned by its default hereunder.

     10. Termination. This Agreement shall be subject to termination in the
absolute discretion of the Representatives, by notice given to the Company prior
to delivery of and payment for the Securities, if (a) at any time prior to such
time (i) trading generally shall have been suspended or materially limited on or
by, as the case may be, any of the New York Stock Exchange, the American Stock
Exchange or the National Association of Securities Dealers, Inc., (ii) trading
of any securities of the Guarantor shall have been suspended on any exchange or
in any over-the-counter market, (iii) a general moratorium on commercial banking
activities in New York shall have been declared by either Federal or New York
State authorities, or (iv) there shall have occurred any outbreak or escalation
of hostilities or any change in financial markets or any calamity or crisis
that, in the judgment of the Representatives, is material and adverse and (b) in
the case of any of the events specified in clauses (a) (i) through (iv), such
event, singly or together with any other such event, makes it, in the judgment
of the Representatives, impracticable to market the Securities on the terms and
in the manner contemplated in the Final Memorandum.

     11. Representations and Indemnities to Survive. The respective agreements,
representations, warranties, indemnities and other statements of the Company or
its officers and of the Initial Purchasers set forth in or made pursuant to this
Agreement will remain in full force and effect, regardless of any investigation
made by or on behalf of the Initial Purchasers or the Company or any of the
officers, directors or controlling persons referred to in Section 8 hereof, and
will survive delivery of and payment for the Securities. The provisions of
Sections 7 and 8 hereof shall survive the termination or cancellation of this
Agreement.

     12. Notices. All communications hereunder will be in writing and effective
only on receipt, and, if sent to the Representatives, will be mailed, delivered
or telefaxed to Merrill Lynch, Pierce, Fenner & Smith Incorporated, 4 World
Financial Center, New York, New York 10080, c/o Michele E. Taub, Esq., facsimile
number (212) 670-4530 and confirmed to it at (212) 670-7578; or, if sent to the
Company, will be mailed, delivered or telefaxed to Burlington Resources Finance
Company, c/o Burlington Resources Inc., 5051 Westheimer, Suite 1400, Houston,
Texas 77056-2124, attention of the Legal Department, facsimile number (713)
624-9627.

     13. Successors. This Agreement will inure to the benefit of and be binding
upon the parties hereto and their respective successors and the officers and
directors and controlling persons referred to in Section 8 hereof, and, except
as expressly set forth in Section 5(h) hereof, no other person will have any
right or obligation hereunder.

                                      -16-
<PAGE>

     14. Applicable Law. This Agreement will be governed by and construed in
accordance with the laws of the State of New York applicable to contracts made
and to be performed within the State of New York. Solely for purposes of
enforcing this Agreement, the Company hereby consents to personal jurisdiction,
service of process and venue in any court in which any claim or proceeding that
is subject to this Agreement is brought against it. Any right to trial by jury
with respect to any claim or proceeding related to or arising out of this
Agreement or any transaction or conduct in connection therewith, and any legal
immunity which may be available to the Company, is hereby waived by the Company.
The agreements contained in this paragraph shall remain in full force and effect
notwithstanding the termination of this Agreement.

     15. Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall constitute an original and all which together
shall constitute one and the same instrument.

     16. Headings. The section headings used herein are for convenience only and
shall not affect the construction hereof.

     17. Definitions. The terms which follow, when used in this Agreement, shall
have the meanings indicated.

     "Act" shall mean the Securities Act of 1933, as amended, and the rules and
regulations of the Commission promulgated thereunder.

     "Affiliate" shall have the meaning set forth in the Indenture.

     "Business Day" shall have the meaning set forth in the Indenture.

     "Commission" shall mean the Securities and Exchange Commission.

     "Exchange Act" shall mean the Securities Exchange Act of 1934, as amended,
and the rules and regulations of the Commission promulgated thereunder.

     "Execution Time" shall mean, the date and time that this Agreement is
executed and delivered by the parties hereto.

     "Investment Company Act" shall mean the Investment Company Act of 1940, as
amended, and the rules and regulations of the Commission promulgated thereunder.

     "NASD" shall mean the National Association of Securities Dealers, Inc.

                                      -17-
<PAGE>

     "Regulation D" shall mean Regulation D under the Act.

     "Regulation S" shall mean Regulation S under the Act.

     "Trust Indenture Act" shall mean the Trust Indenture Act of 1939, as
amended, and the rules and regulations of the Commission promulgated thereunder.

                                      -18-
<PAGE>

     If the foregoing is in accordance with your understanding of our agreement,
please sign and return to us the enclosed duplicate hereof, whereupon this
Agreement and your acceptance shall represent a binding agreement between the
Company and the several Initial Purchasers.

                            Very truly yours,

                            BURLINGTON RESOURCES FINANCE COMPANY

                            By:   /s/ Daniel D. Hawk
                                  --------------------------------
                                  Name:   Daniel D. Hawk
                                  Title:

The foregoing Agreement is hereby
confirmed and accepted as of the date
first above written.

Merrill Lynch, Pierce, Fenner & Smith
     Incorporated

By  /s/ F. Brady Parish, Jr.
    ----------------------------------
     Name:   F. Brady Parish, Jr.
     Title:  Vice President

Morgan Stanley & Co. Incorporated

By  /s/ Michael Fusco
    ----------------------------------
     Name:   Michael Fusco
     Title:  Executive Director

For themselves and the other several Initial
Purchasers named in Schedule I to
the foregoing Agreement.

                                      -19-
<PAGE>

                                   SCHEDULE I

<TABLE>
<CAPTION>
Initial Purchasers                                      Principal Amount           Principal Amount        Principal Amount
------------------
                                                        of 2006 Notes              of 2011 Notes           of 2031 Notes
                                                        to be Purchased            to be Purchased         to be Purchased
                                                        ---------------            ---------------         ---------------

<S>                                                             <C>                       <C>                     <C>
Merrill Lynch, Pierce, Fenner & Smith                           $154,750,000              $154,750,000            $154,750,000
     Incorporated
Morgan Stanley & Co. Incorporated.                               154,750,000               154,750,000             154,750,000
Banc of America Securities LLC                                    13,600,000                13,600,000              13,600,000
BNP Paribas Securities Corp.                                      13,600,000                13,600,000              13,600,000
First Union Securities, Inc.                                      13,600,000                13,600,000              13,600,000
Fleet Securities, Inc.                                            13,600,000                13,600,000              13,600,000
Mellon Financial Markets, LLC                                     13,600,000                13,600,000              13,600,000
Salomon Smith Barney, Inc.                                        13,600,000                13,600,000              13,600,000
Scotia Capital (USA) Inc.                                         13,600,000                13,600,000              13,600,000
TD Securities (USA) Inc.                                          13,600,000                13,600,000              13,600,000
The Royal Bank of Scotland plc                                    13,600,000                13,600,000              13,600,000
Tokyo-Mitsubishi International plc                                13,600,000                13,600,000              13,600,000
ABN AMRO Incorporated                                              6,812,500                 6,812,500               6,812,500
Banc One Capital Markets, Inc.                                     6,812,500                 6,812,500               6,812,500
Barclays Capital Inc.                                              6,812,500                 6,812,500               6,812,500
BNY Capital Markets, Inc.                                          6,812,500                 6,812,500               6,812,500
Credit Suisse First Boston Corporation                             6,812,500                 6,812,500               6,812,500
Mizuho International plc                                           6,812,500                 6,812,500               6,812,500
RBC Dominion Securities Corporation                                6,812,500                 6,812,500               6,812,500
Wells Fargo Brokerage Services, LLC                                6,812,500                 6,812,500               6,812,500
                                                               -------------              ------------            ------------
         Total                                                  $500,000,000              $500,000,000            $500,000,000

</TABLE>

<PAGE>

                                                                       EXHIBIT A

                              [Form of] Opinion of
                    Counsel for the Guarantor and the Company

The opinion of counsel for the Company to be delivered pursuant to Section 6(a)
of the Purchase Agreement shall be to the effect that:

          (i) the Guarantor is a corporation duly organized, validly existing
     and in good standing under the laws of the State of Delaware;

          (ii) the Guarantor (a) has the corporate power and authority to own
     its property and to conduct its business as described in the Final
     Memorandum and (b) is duly qualified to transact business and is in good
     standing in each jurisdiction in which the conduct of its business or its
     ownership or leasing of property requires such qualification, except to the
     extent that the failure to be so qualified or be in good standing would not
     have a material adverse effect on the Company and its subsidiaries, taken
     as a whole;

          (iii) the Company and each material subsidiary of the Guarantor has
     been duly incorporated, is validly existing as a corporation in good
     standing under the laws of the jurisdiction of its incorporation, has the
     corporate power and authority to own its property and to conduct its
     business as described in the Final Memorandum and is duly qualified to
     transact business and is in good standing in each jurisdiction in which the
     conduct of its business or its ownership or leasing of property requires
     such qualification, except to the extent that the failure to be so
     qualified or be in good standing would not have a material adverse effect
     on the Guarantor and its subsidiaries, taken as a whole;

          (iv) the Purchase Agreement and the Registration Rights Agreement has
     been duly authorized, executed and delivered by the Company and the
     Purchase Agreement Guarantee has been duly authorized, executed and
     delivered by the Guarantor;

          (v) the Indenture has been duly qualified under the Trust Indenture
     Act and has been duly authorized, executed and delivered by the Company,
     and each of the Indenture, Purchase Agreement and the Registration Rights
     Agreement is a valid and binding agreement of the Company, enforceable in
     accordance with its terms except that (a) the enforceability thereof may be
     subject to bankruptcy, insolvency, reorganization, moratorium, fraudulent
     transfer or conveyance or other similar laws now or hereafter in effect
     relating to or affecting creditors' rights or remedies generally, (b)

<PAGE>
                                      -2-

     the remedy of specific performance and injunctive and other forms of
     equitable relief may be subject to equitable defenses and to the discretion
     of the court before which any proceedings therefor may be brought
     (regardless of whether enforcement is sought in a proceeding at law or
     equity) and (c) rights to indemnification and contribution under the
     Purchase Agreement and Registration Rights Agreement may be limited under
     the applicable law or public policy considerations;

          (vi) the Securities have been duly authorized and, when executed and
     authenticated in accordance with the provisions of the Indenture and
     delivered to and paid for by the Initial Purchasers in accordance with the
     terms of the Purchase Agreement, will be entitled to the benefits of the
     Indenture and will be valid and binding obligations of the Company, in each
     case enforceable in accordance with their respective terms except that (a)
     the enforceability thereof may be subject to bankruptcy, insolvency,
     reorganization, moratorium, fraudulent transfer or conveyance or other
     similar laws now or hereafter in effect relating to or affecting creditors'
     rights or remedies generally, (b) the remedy of specific performance and
     injunctive and other forms of equitable relief may be subject to equitable
     defenses and to the discretion of the court before which any proceedings
     therefor may be brought (regardless of whether enforcement is sought in a
     proceeding at law or equity);

          (vii) each of the Securities Guarantee, Purchase Agreement Guarantee
     and the Registration Rights Agreement has been duly authorized, executed
     and delivered by the Guarantor and is a valid and binding agreement of the
     Guarantor, enforceable in accordance with its terms except that (a) the
     enforceability thereof may be subject to bankruptcy, insolvency,
     reorganization, moratorium, fraudulent transfer or conveyance or other
     similar laws now or hereafter in effect relating to or affecting creditors'
     rights or remedies generally, (b) the remedy of specific performance and
     injunctive and other forms of equitable relief may be subject to equitable
     defenses and to the discretion of the court before which any proceedings
     therefor may be brought (regardless of whether enforcement is sought in a
     proceeding at law or equity) and (c) rights to indemnification and
     contribution under the Purchase Agreement Guarantee and the Registration
     Rights Agreement may be limited under the applicable law or public policy
     considerations;

          (viii) the execution and delivery by the Company of, and the
     performance by the Company of its obligations under, the Purchase
     Agreement, the Registration Rights Agreement, the Indenture and the
     Securities will not contravene any provisions of the memorandum or articles
     of association of the Company;

          (ix) the execution and delivery by the Guarantor of, and the
     performance by the Guarantor of its obligations under, the Purchase
     Agreement Guarantee, the Regis-

<PAGE>
                                      -3-

     tration Rights Agreement and the Securities Guarantee will not contravene
     any provisions of the certificate of incorporation or by-laws of the
     Guarantor;

          (x) to the knowledge of such counsel, the execution and delivery by
     the Company of, and the performance by the Company of its obligations
     under, the Purchase Agreement, the Registration Rights Agreement, the
     Indenture and the Securities and the execution and delivery by the
     Guarantor of, and the performance by the Guarantor of its obligations
     under, the Purchase Agreement Guarantee, the Registration Rights Agreement
     and the Securities Guarantee will not contravene any provision of
     applicable law or any agreement or other instrument binding upon the
     Guarantor, the Company or any other subsidiary of the Guarantor that has
     been filed pursuant to and in accordance with the Exchange Act, or any
     judgment, order or decree of any governmental body, agency or court of the
     United States, Canada or any jurisdiction therein or any other jurisdiction
     having jurisdiction over the Guarantor or any of its subsidiaries, or any
     provision of applicable law (other than state securities law) and no
     consent, approval, authorization or order of or qualification with any
     governmental body or agency is required for the performance by the Company
     of its obligations under the Purchase Agreement, the Registration Rights
     Agreement, the Indenture or the Securities or by the Guarantor of its
     obligations under the Purchase Agreement Guarantee, the Registration Rights
     Agreement or the Securities Guarantee, except in each case as such may be
     required by the federal securities laws or Blue Sky laws of the various
     states in connection with the offer and sale of the Securities and except
     such approvals as may be required by the SEC in relation to any
     Registration Statement (as defined in the Registration Rights Agreement);

          (xi) the statements (a) in the Final Memorandum under the captions
     "Description of Notes and Guarantees" and "Plan of Distribution" and (b)
     "Item 3 - Legal Proceedings" of the Guarantor's most recent annual report
     on Form 10-K incorporated by reference in the Final Memorandum, in each
     case insofar as such documents constitute summaries of the legal matters,
     documents or legal proceedings referred to therein, fairly present the
     information called for with respect to such legal matters, documents and
     proceedings, and fairly summarize the matters referred to therein;

          (xii) such counsel does not know of (a) any legal or governmental
     proceedings pending or threatened to which the Guarantor or any of its
     subsidiaries is a party or to which any of the properties of the Guarantor
     or any of its subsidiaries is subject that are required to be described in
     the Final Memorandum and are not so described or of (b) any statutes,
     regulations, contracts or other documents that are required to be described
     in the Final Memorandum or to be incorporated by reference therein that are
     not described or incorporated as required;

<PAGE>
                                      -4-

          (xiii) neither the Company nor the Guarantor are, nor are either of
     them directly or indirectly controlled by or acting on behalf of any person
     which is, (i) an "investment company" within the meaning of the Investment
     Company Act of 1940, as amended, and the rules and regulations promulgated
     by the Commission thereunder or (ii) a "holding company" within the meaning
     of, or subject to regulation under, the Public Utility Holding Company Act
     of 1935, as amended, and the rules and regulations promulgated by the
     Commission thereunder;

          (xiv) (a) such counsel is of the opinion that each document, if any,
     filed pursuant to the Exchange Act and incorporated by reference in the
     Final Memorandum (except for financial statements and schedules and other
     financial or statistical information included therein as to which such
     counsel need not express any opinion) was appropriately responsive when so
     filed in all material respects to the requirements of the Exchange Act and
     the applicable rules and regulations of the Commission thereunder and (b)
     no facts have come to the attention of such counsel that lead such counsel
     to believe that the Final Memorandum, as of its date or as of the date of
     such opinion, contained or contains an untrue statement of a material fact
     or omitted or omits to state a material fact necessary in order to make the
     statements therein, in the light of the circumstances under which they were
     made, not misleading (it being understood that such counsel has not been
     requested to and does not make any comment with respect to the financial
     statements and schedules and other financial and statistical data included
     or incorporated by reference in the Final Memorandum);

          (xv) subject to the assumptions, qualifications and limitations
     contained therein, the statements set forth in the Final Memorandum under
     the heading "Certain Income Tax Considerations -- Canadian Federal Income
     Tax Considerations," insofar as such statements constitute a summary of
     certain Canadian federal income tax considerations, fairly represent the
     information referred to therein;

          (xvi) to our knowledge, no litigation or governmental proceedings are
     pending or threatened against the Company or any of its subsidiaries which
     would adversely affect the ability of the Guarantor, Burlington Resources
     Canada Inc. or any of the Guarantor's subsidiaries individually or in the
     aggregate, to perform its obligations under the Purchase Agreement, the
     Registration Rights Agreement, the Indenture or the Securities which is not
     disclosed and correctly summarized in the Final Memorandum;

          (xvii) assuming (i) the accuracy of, and compliance with, the
     representations, warranties and covenants of the Company and the Guarantor
     contained in the Purchase Agreement, (ii) the accuracy of, and compliance
     with, the representations, warranties and covenants of the Initial
     Purchasers contained in Section 4 of the Purchase Agree-

<PAGE>
                                      -5-

     ment, (iii) the accuracy of the representations and warranties of each of
     the purchasers to whom any of the Initial Purchasers initially resells the
     Securities deemed to have been made pursuant to the Final Memorandum, (iv)
     the compliance by the Company and the Guarantor and the Initial Purchasers
     with the offering and transfer procedures and restrictions described in the
     Final Memorandum, the Purchase Agreement and the Indenture and (v) the
     receipt by the purchasers to whom the Initial Purchasers initially resell
     the Securities of a copy of the Final Memorandum prior to such sale, it is
     not necessary in connection with the offer, sale and delivery of the
     Securities to the Initial Purchasers or in connection with the initial
     resales of the Securities by the Initial Purchasers in the manner
     contemplated by the Purchase Agreement and the Offering Memorandum to
     register the Securities under the Securities Act of 1933, as amended, and
     it is not necessary to qualify the Indenture under the Trust Indenture Act
     of 1939, as amended; it being understood that no opinion is expressed as to
     any subsequent resale of any Securities;

          (xviii) a court of competent jurisdiction in the Province of Alberta
     would give effect to the choice of New York law as the proper law governing
     the Indenture, the Securities, the Registration Rights Agreement and the
     Purchase Agreement provided that such choice of law is bona fide (in the
     sense that it was not made with a view to avoiding the consequences of the
     laws of any other jurisdiction) and provided that such choice of law is not
     contrary to public policy, as that term is understood under the laws of the
     Province of Alberta and the federal laws of Canada applicable therein; to
     our knowledge, there are no reasons under present law for avoiding the
     choice of New York law to govern the Indenture, the Securities, the
     Registration Rights Agreement and the Purchase Agreement under the laws of
     the Province of Alberta and the federal laws of Canada applicable therein;

          (xix) if the Indenture, the Securities, the Registration Rights
     Agreement and the Purchase Agreement were sought to be enforced in the
     Province of Alberta in accordance with the laws applicable thereto, as
     chosen by the parties, namely, New York law, a court of competent
     jurisdiction in the Province of Alberta would, subject to paragraph (xviii)
     above, and to the extent specifically pleaded and proved as a fact by
     expert evidence, recognize the choice of New York law and apply such law to
     all issues that, under the conflict of laws rules of the Province of
     Alberta, are to be determined in accordance with the proper or general law
     of a contract, provided that none of the provisions of the Indenture, the
     Securities, the Registration Rights Agreement and the Purchase Agreement,
     or of New York law, are contrary to public policy as that term is
     understood under the laws of the Province of Alberta and the federal laws
     of

<PAGE>
                                      -6-

     Canada applicable therein; and further provided that, in matters of
     procedure (as that term is understood under the laws of the Province of
     Alberta and the federal laws of Canada applicable therein), the laws of the
     Province of Alberta will be applied including the Limitations Act
     (Alberta), and a court of competent jurisdiction in the Province of Alberta
     will retain discretion to decline to hear such action and apply such law
     (i) if it is contrary to public policy (as that term is understood under
     the laws of the Province of Alberta and the federal laws of Canada
     applicable therein) for such court to do so, or (ii) if it is not the
     proper forum to hear such an action, or (iii) if concurrent proceedings are
     being brought elsewhere; to our knowledge, there are no reasons based on
     public policy, as that term is understood under the laws of the Province of
     Alberta and the laws of Canada applicable therein, for avoiding enforcement
     of the Indenture, the Securities, the Registration Rights Agreement or the
     Purchase Agreement (with the exception of the indemnity and contribution
     provisions contained therein);

          (xx) the laws of the Province of Alberta permit an action to be
     brought in a court of competent jurisdiction in the Province of Alberta on
     any final and conclusive judgment in personam for a fixed sum of money of
     any federal or state court located in the Borough of Manhattan in the City
     of New York ("New York Court") respecting the enforcement of the Indenture,
     the Securities, the Registration Rights Agreement and the Purchase
     Agreement that is not impeachable as void or voidable under the internal
     laws of the State of New York for a sum certain if: (i) the court rendering
     such judgment had jurisdiction over the judgment debtor, as recognized by
     the courts of the Province of Alberta (to our knowledge, submission under
     the provisions of the Indenture, the Securities, the Registration Rights
     Agreement and the Purchase Agreement to the jurisdiction of the New York
     Court will be sufficient for this purpose), and the judgment debtor was
     properly served in the action leading to such judgment; (ii) such judgment
     was not obtained by fraud or in a manner contrary to natural justice and
     the enforcement thereof would not be inconsistent with public policy, as
     such term is understood under the laws of the Province of Alberta, or
     contrary to any order made by the Attorney General of Canada under the
     Foreign Extraterritorial Measures Act (Canada) or by the Competition
     Tribunal under the Competition Act (Canada); (iii) the enforcement of such
     judgment does not constitute, directly or indirectly, the enforcement of
     foreign revenue, expropriation or penal laws or other laws of a public law
     nature; (iv) no new admissible evidence relevant to the action is
     discovered prior to rendering of judgment by the court in the Province of
     Alberta; and (v) the action to enforce such judgment is commenced within
     the applicable limitation periods; to our knowledge, there are no reasons
     under present law of the Province of Alberta for avoiding recognition of
     said judgments of New York Courts which might be rendered in respect of the
     Indenture, the Securities, the Registration Rights Agreement and the
     Purchase Agreement based upon public policy, as that term is understood
     under the laws of the Province of Alberta and the federal laws of Canada
     applicable therein; and

<PAGE>
                                      -7-

          (xxi) in an action on a final and conclusive judgment in personam for
     a fixed sum of money of a New York Court which is not impeachable as void
     or voidable under New York law, a court of competent jurisdiction in the
     Province of Alberta would not refuse to recognize the jurisdiction of the
     court rendering such judgment on the basis of process having been served on
     CT Corporation System as the agent to receive service of process in the
     United States of America appointed by the Company under the Indenture, the
     Registration Rights Agreement and the Purchase Agreement provided the
     Company has not purported to revoke the appointment, or CT Corporation
     System has not terminated the agency or otherwise rendered service on it
     ineffective.

     With respect to paragraph (x) above, each of Cahill Gordon & Reindel,
special U.S. counsel to the Company and Guarantor, and Bennett Jones LLP,
special Canadian counsel to the Company and Guarantor, may each (i) limit the
agreements and instruments referred to in paragraph (x) of this section to only
those agreements and instruments that have been filed pursuant to and in
accordance with the Exchange Act and (ii) rely on one or more certificates of
the Vice President and General Counsel of the Guarantor and Company for their
opinion indicating a lack of conflicts as described in paragraph (x).

     The 10b-5 letter shall include the following:

     We have participated in conferences with officers and other representatives
of the Company, representatives of the independent public accountants of the
Company and representatives of the Initial Purchasers at which the contents of
the Final Memorandum and related matters were discussed. Given the limitations
inherent in the role of outside counsel and the character of determinations
involved in the preparation of the Final Memorandum, we are not passing upon and
do not assume any responsibility for the accuracy, completeness or fairness of
the statements contained in the Final Memorandum and have made no independent
check or verification thereof (except to the extent provided in paragraph 5
above). On the basis of the foregoing, no facts have come to our attention which
lead us to believe that the Final Memorandum, as of its date or as of the date
hereof, contained or contains an untrue statement of a material fact or omitted
or omits to state a material fact necessary to make the statements therein, in
the light of the circumstances under which they were made, not misleading (it
being understood that we express no comment with respect to the financial
statements, including the notes thereto, or any other financial or statistical
data that is found in or derived from the internal accounting and other records
of the Company and its subsidiaries set forth or referred to in the Final
Memorandum).

<PAGE>

                                                                       EXHIBIT B

                                    [Form of]
                       Selling Restrictions for Offers and
                        Sales outside the United States

     (1) (a) The Securities have not been and will not be registered under the
Act and may not be offered or sold within the United States or to, or for the
account or benefit of, U.S. persons except in accordance with Regulation S under
the Act or pursuant to an exemption from the registration requirements of the
Act. Each Initial Purchaser represents and agrees that, except as otherwise
permitted by Section 4(a)(i) or (ii) of the Agreement to which this is an
exhibit, it has offered and sold the Securities, and will offer and sell the
Securities, (i) as part of their distribution at any time; and (ii) otherwise
until 40 days after the later of the commencement of the offering and the
Closing Date, only in accordance with Rule 903 of Regulation S under the Act.
Accordingly, each Initial Purchaser represents and agrees that neither it, nor
any of its Affiliates nor any person acting on its or their behalf has engaged
or will engage in any directed selling efforts with respect to the Securities,
and that it and they have complied and will comply with the offering
restrictions requirement of Regulation S. Each Initial Purchaser agrees that, at
or prior to the confirmation of sale of Securities (other than a sale of
Securities pursuant to Section 4(a)(i) or (ii) of the Agreement to which this is
an exhibit), it shall have sent to each distributor, dealer or person receiving
a selling concession, fee or other remuneration that purchases Securities from
it during the distribution compliance period a confirmation or notice to
substantially the following effect:

     "The Securities covered hereby have not been registered under the U.S.
     Securities Act of 1933 (the "Act") and may not be offered or sold within
     the United States or to, or for the account or benefit of, U.S. persons (i)
     as part of their distribution at any time or (ii) otherwise until 40 days
     after the later of the commencement of the offering and November 16, 2001,
     except in either case in accordance with Regulation S or Rule 144A under
     the Act. Terms used above have the meanings given to them by Regulation S."

     (b) Each Initial Purchaser also represents and agrees that it has not
entered and will not enter into any contractual arrangement with any distributor
with respect to the distribution of the Securities, except with its Affiliates
or with the prior written consent of the Company.

     (c) Terms used in this section have the meanings given to them by
Regulation S.

<PAGE>
                                      -2-

     (2) Each Initial Purchaser represents and agrees that (i) it has not
offered or sold, and will not offer or sell, in the United Kingdom, by means of
any document, any Securities other than to persons whose ordinary business it is
to buy or sell shares or debentures, whether as principal or as agent (except in
circumstances which do not constitute an offer to the public within the meaning
of the Companies Act 1989 of Great Britain); (ii) it has complied and will
comply with all applicable provisions of the Financial Services Act 1986 of the
United Kingdom with respect to anything done by it in relation to the Securities
in, from or otherwise involving the United Kingdom; and (iii) it has only issued
or passed on and will only issue or pass on in the United Kingdom any document
received by it in connection with the issue of the Securities to a person who is
of a kind described in Article 9(3) of the Financial Services Act 1986
(Investment Advertisements) (Exemptions) Order 1996 or is a person to whom the
document may otherwise lawfully be issued or passed on.

<PAGE>

                                                                       EXHIBIT C

                                    [Form of]
                          Purchase Agreement Guarantee
                          by Burlington Resources Inc.

     Burlington Resources Inc., a Delaware corporation (the "Guarantor"), hereby
guarantees, as a primary obligor and not merely as surety, the due and punctual
payment and performance by Burlington Resources Finance Company, a Nova Scotia
unlimited liability company (the "Company"), of its obligations under the
Purchase Agreement dated as of November 8, 2001 (the "Purchase Agreement"),
between the several Initial Purchasers named therein and the Company (all such
obligations being referred as the "Obligations"). Capitalized terms used but not
defined herein are used with the meanings assigned to them in the Purchase
Agreement.

     This Purchase Agreement Guarantee constitutes a guarantee of payment when
due and not of collection.

     The Guarantor guarantees that the Obligations will be paid when due
strictly in accordance with their terms, regardless of any law, regulation or
order now or hereafter in effect in any jurisdiction affecting any of such terms
or the rights of the Initial Purchasers with respect thereto and regardless of
any other circumstance which might otherwise constitute a defense available to,
or a discharge of, the Guarantor. This Purchase Agreement Guarantee shall
continue to be effective or be reinstated, as the case may be, if at any time
any payment of any of the Obligations is rescinded or must otherwise be returned
by the Initial Purchasers upon the insolvency, bankruptcy or reorganization of
the Company or otherwise, all as though such payment had not been made.

     The Guarantor waives promptness, diligence, notice of acceptance and any
other notice with respect to any of the Obligations and this Purchase Agreement
Guarantee and any requirement that the Initial Purchasers exercise any right or
take any action against the Company.

     Until the irrevocable payment in full in cash of all the Obligations, the
Guarantor irrevocably waives any claim or other rights which it may now or
hereafter acquire against the Initial Purchasers that arise from the existence,
payment, performance or enforcement of the Guarantor's obligations under this
Purchase Agreement Guarantee, including any right of subrogation, reimbursement,
exoneration, or indemnification and any right to participate in any claim or
remedy of the Initial Purchasers against the Company, whether or not such claim,
remedy or right arises in equity, or under contract, statute or common law. If
any

<PAGE>
                                      -2-

amount shall be paid to the Guarantor in violation of the preceding sentence and
the Obligations shall not have been paid in cash in full, such amount shall be
deemed to have been paid to the Guarantor for the benefit of, and held in trust
for the Initial Purchasers, and shall promptly be credited and applied against
the Obligations.

     The Guarantor represents and warrants to each of the Initial Purchasers
that as of the date hereof and as of the Closing Date that:

          (a) The Guarantor is a corporation duly incorporated, validly existing
     and in good standing under the laws of the State of Delaware, has the
     corporate power and authority to own its property and to conduct its
     business as described in the Prospectus and is duly qualified to transact
     business and is in good standing in each jurisdiction in which the conduct
     of its business or its ownership or leasing of property requires such
     qualification, except to the extent that the failure to be so qualified or
     be in good standing would not have a material adverse effect on the
     Guarantor and its subsidiaries, taken as a whole.

          (b) Burlington Resource Finance Company and each material subsidiary
     of the Guarantor has been duly organized, is validly existing in good
     standing under the laws of the jurisdiction of its organization, has the
     power and authority to own its property and to conduct its business as
     described in the Offering Memorandum and is duly qualified to transact
     business and is in good standing in each jurisdiction in which the conduct
     of its business or its ownership or leasing of property requires such
     qualification, except to the extent that the failure to be so qualified or
     be in good standing would not have a material adverse effect on the
     Guarantor and its subsidiaries, taken as a whole.

          (c) The Purchase Agreement Guarantee, Registration Rights Agreement
     and Securities Guarantee have been duly authorized, executed and delivered
     by the Guarantor.

          (d) The execution and delivery by the Guarantor of, and the
     performance by the Guarantor of its obligations under, this Purchase
     Agreement Guarantee, the Registration Rights Agreement and the Securities
     Guarantee will not contravene any provision of applicable law or the
     certificate of incorporation or by-laws of the Guarantor or any agreement
     or other instrument binding upon the Guarantor or any of its subsidiaries
     or affiliates that is material to the Guarantor and its subsidiaries, taken
     as a whole, or any judgment or decree of any governmental agency or court
     having jurisdiction over the Guarantor or any subsidiary, and no consent,
     approval, authorization or order of or qualification with any governmental
     body or agency is required for the perform-

<PAGE>
                                      -3-

     ance by the Guarantor of its obligations under this Purchase Agreement
     Guarantee or the Securities Guarantee.

          (e) There has not occurred any material adverse change in, or any
     adverse development which materially affects, the condition, financial or
     otherwise, or in the earnings, business or operations of the Guarantor and
     its subsidiaries, taken as a whole, from that set forth in the Preliminary
     Memorandum and the Final Memorandum.

          (f) The Securities Guarantee has been duly authorized, executed and
     delivered by the Guarantor and is a valid and binding agreement of the
     Guarantor, enforceable in accordance with its terms except as (i) the
     enforceability thereof may be limited by bankruptcy, insolvency or similar
     laws affecting creditors' rights generally and (ii) rights of acceleration
     and the availability of equitable remedies may be limited by equitable
     principles of general applicability.

          (g) The Guarantor is not, nor is it directly or indirectly controlled
     by or acting on behalf of any person which is, (i) an "investment company"
     within the meaning of the Investment Company Act of 1940, as amended, and
     the rules and regulations promulgated by the Commission thereunder or (ii)
     a "holding company" within the meaning of, or subject to regulation under,
     the Public Utility Holding Company Act of 1935, as amended, and the rules
     and regulations promulgated by the Commission thereunder.

          (h) Except as disclosed in the Offering Memorandum, there is no
     action, suit, proceeding, inquiry or investigation before or brought by any
     court or governmental agency or body, domestic or foreign, now pending, or,
     to the knowledge of the Guarantor, threatened, against or affecting the
     Guarantor or any of its subsidiaries which might reasonably be expected to
     result in a Material Adverse Effect, or which might reasonably be expected
     to materially and adversely affect the properties or assets of the
     Guarantor or any of its subsidiaries or the consummation of the
     transactions contemplated by this Agreement or the performance by the
     Guarantor of its obligations hereunder.

          (i) Neither the Guarantor, nor any of its Affiliates, nor any person
     acting on its or their behalf has, directly or indirectly, made offers or
     sales of any security, or solicited offers to buy any security, under
     circumstances that would require the registration of the Securities under
     the Act.

          (j) Neither the Guarantor, nor any of its Affiliates, nor any person
     acting on its or their behalf has engaged in any form of general
     solicitation or general advertising

<PAGE>
                                      -4-

     (within the meaning of Regulation D) in connection with any offer or sale
     of the Securities in the United States.

          (k) The Securities satisfy the eligibility requirements of Rule
     144A(d)(3) under the Act.

          (l) Neither the Guarantor, nor any of its Affiliates, nor any person
     acting on its or their behalf has engaged in any directed selling efforts
     with respect to the Securities, and each of them has complied with the
     offering restrictions requirement of Regulation S. Terms used in this
     paragraph have the meanings given to them by Regulation S.

     In further consideration of the agreements of the Initial Purchasers
contained in the Purchase Agreement, the Guarantor covenants as follows:

          (a) To make generally available to the Guarantor's security holders
     and to the Representatives as soon as practicable an earnings statement
     covering a twelve-month period beginning on the first day of the first full
     fiscal quarter after the date of this Agreement, which earnings statement
     shall satisfy the provisions of Section 11(a) of the Securities Act and the
     rules and regulations of the Commission thereunder.

          (b) During the period beginning on the date of the Purchase Agreement
     and continuing to and including the Closing Date, not to offer, sell,
     contract to sell or otherwise dispose of any debt securities of the
     Guarantor substantially similar to the Offered Securities (other than the
     Offered Securities) without the prior written consent of the
     Representatives.

     This Purchase Agreement Guarantee may be signed in any number of
counterparts, each of which shall be an original, with the same effect as if the
signatures thereto were upon the same instrument.

     This Purchase Agreement Guarantee shall be governed by and construed in
accordance with the internal laws of the State of New York. This Purchase
Agreement Guarantee sets forth the entire agreement between the parties with
respect to the matters addressed herein and supersedes all prior communications,
written or oral, with respect hereto.

     The Guarantor waives all right to trial by jury in any action, proceeding
or counterclaim (whether based on contract, tort or otherwise) arising out of or
relating to this Purchase Agreement Guarantee or the transactions contemplated
hereby or the actions of the Guarantor and the Initial Purchasers in the
negotiation, performance or enforcement hereof.

<PAGE>
                                      -5-

                               BURLINGTON RESOURCES INC.

                               By:  ___________________________________
                                     Name:
                                     Title:

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