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                                                                    EXHIBIT 1(b)



                  U.S.$550,000,000 AGGREGATE PRINCIPAL AMOUNT

                            ANADARKO FINANCE COMPANY

                          6 3/4% SENIOR NOTES DUE 2011

              ALL OBLIGATIONS FULLY AND UNCONDITIONALLY GUARANTEED

                        BY ANADARKO PETROLEUM CORPORATION

                               PURCHASE AGREEMENT

                                                                    MAY 16, 2001

CREDIT SUISSE FIRST BOSTON CORPORATION
Eleven Madison Avenue
New York, N.Y. 10010-3629


Ladies and Gentlemen:

         1. Introductory. Anadarko Finance Company, an unlimited liability
company organized under the laws of the province of Nova Scotia, Canada (the
"COMPANY"), proposes, subject to the terms and conditions stated herein, to
issue and sell to Credit Suisse First Boston Corporation (the initial
"PURCHASER") U.S.$550,000,000 aggregate principal amount of its 6 3/4% Senior
Notes due 2011 on the terms shown on Exhibit A attached hereto ("NOTES"), to be
issued under an indenture, dated as of April 26, 2001, as amended by a
supplemental indenture to be dated as of the closing of this transaction (the
"INDENTURE"), between the Company and The Bank of New York, as Trustee, on a
private placement basis pursuant to an exemption under Section 4(2) of the
Securities Act of 1933 (the "SECURITIES ACT"), to be fully and unconditionally
guaranteed by Anadarko Petroleum Corporation, a Delaware corporation
("ANADARKO") in accordance with the terms of the Indenture. Such guarantees are
referred to as the "GUARANTEES" and the Notes and the Guarantees are
collectively referred to as the "OFFERED SECURITIES". Each of the Company and
Anadarko hereby agrees with the Purchaser as follows:

         2. Representations and Warranties of the Company and Anadarko. The
Company and Anadarko jointly and severally represent and warrant to, and agree
with, the Purchaser that:

                  (a) An offering circular relating to the Offered Securities
         has been prepared by the Company. Such offering circular (the "OFFERING
         CIRCULAR"), as amended or supplemented, together with the documents
         incorporated by reference therein, is hereinafter referred to as the
         "OFFERING DOCUMENT". The Offering Document does not, and will not as of
         the Closing Date, include any untrue statement of a material fact or
         omit to state any material fact necessary in order to make the
         statements therein, in the light of the circumstances under which they
         were made, not misleading. The preceding sentence does not apply to
         statements in or omissions from the Offering Document based upon
         written information furnished to the Company and Anadarko by the
         Purchaser specifically for use therein, it being understood and agreed
         that the only such information is that described as such in Section
         7(b) hereof. The documents incorporated in the Offering Circular, when
         they were filed with the Securities and Exchange Commission (the
         "COMMISSION") and all subsequent reports (collectively, the "EXCHANGE
         ACT REPORTS") which have been filed by Anadarko with the Commission or
         sent to shareholders pursuant to the Securities Exchange Act of 1934
         (the "EXCHANGE ACT") did not include any untrue statement of a material
         fact




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         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; and any further documents so filed and incorporated by
         reference or deemed to be incorporated by reference in the Offering
         Circular, when such documents are filed with the Commission will
         conform in all material respects to the requirements of the Exchange
         Act and will not contain any untrue statement of a material fact or
         omit to state any material fact required to be stated therein or
         necessary to make the statements therein, in light of the circumstances
         in which they were made, not misleading. Such documents, when they were
         filed with the Commission, conformed in all material respects to the
         requirements of the Exchange Act and the rules and regulations of the
         Commission thereunder.

                  (b) Anadarko has been duly incorporated and is an existing
         corporation in good standing under the laws of Delaware, with corporate
         power and authority to own its properties and conduct its business as
         described in the Offering Document; and Anadarko is duly qualified to
         do business as a foreign corporation in good standing in all other
         jurisdictions in which its ownership or lease of property or the
         conduct of its business 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 Anadarko and its subsidiaries
         taken as a whole.

                  (c) The Company has been duly organized and is an existing
         unlimited liability company in good standing under the laws of the
         province of Nova Scotia, with corporate power and authority to own its
         properties and conduct its business as described in the Offering
         Document.

                  (d) Each significant subsidiary of Anadarko within the meaning
         of Regulation S-X (a "SIGNIFICANT SUBSIDIARY") that is a corporation is
         a duly incorporated and validly existing corporation in good standing
         under the laws of its jurisdiction of incorporation, and each
         Significant Subsidiary that is a limited liability company is duly
         organized and validly existing under the laws of its jurisdiction of
         organization, in each case with full power and authority to own, lease
         and operate its properties and conduct its business as described in the
         Offering Document. Each Significant Subsidiary is duly qualified or
         licensed to do business as a foreign corporation or other applicable
         entity in good standing in each jurisdiction in which the conduct of
         its business or its ownership or leasing of property requires such
         qualification or licensing, except to the extent that the failure to be
         so qualified or licensed or be in good standing would not have a
         material adverse effect on Anadarko and its subsidiaries taken as a
         whole. The issued and outstanding common stock of each Significant
         Subsidiary has been duly authorized and validly issued and is fully
         paid and non-assessable, except as disclosed in the Offering Document,
         and is owned by Anadarko free and clear of any mortgages, liens or
         similar encumbrances.

                  (e) The Company owns no equity interest in any other
         corporation.

                  (f) The Indenture has been duly authorized by the Company and
         Anadarko and (assuming due authorization, execution and delivery
         thereof by the Trustee) when executed and delivered by the Company and
         Anadarko will constitute a valid and binding agreement of the Company
         and Anadarko enforceable against the Company and Anadarko in accordance
         with its terms, except to the extent enforcement thereof may be limited
         by bankruptcy, insolvency, fraudulent transfer, reorganization,
         moratorium and other laws now or hereafter in effect relating to or
         affecting creditors' rights generally and general principles of equity
         (whether enforcement is sought in equity or at law); and the Indenture
         conforms in all material respects to the description thereof contained
         in the Offering Circular.

                  (g) The Registration Rights Agreement, to be dated the Closing
         Date, between the Company, Anadarko and the Purchaser (the
         "REGISTRATION RIGHTS AGREEMENT") has been duly authorized by the
         Company and Anadarko; when the Registration Rights Agreement is duly
         executed and delivered by the Company and Anadarko, assuming due
         authorization, execution and delivery by the Purchaser, it will be a
         valid and binding agreement of the Company and Anadarko enforceable
         against the Company and Anadarko in accordance with its terms, except
         to the extent enforcement thereof may be limited by bankruptcy,
         insolvency, fraudulent transfer, reorganization, moratorium and other
         laws now or hereafter in effect relating to or affecting creditors'
         rights generally and general principles of equity (whether enforcement
         is sought in equity or at law) and except with respect to the rights of
         indemnification and contribution thereunder, which enforcement thereof
         may be limited by federal or state securities laws or the policies
         underlying such laws; and the Registration Rights Agreement conforms in
         all material respects to the description thereof contained in the
         Offering Circular.

                  (h) The Notes and Guarantees have been duly authorized for
         issuance and sale by the Company and Anadarko, as the case may be,
         pursuant to this Agreement (or will have been so authorized prior to
         each




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         issuance of Offered Securities) and, when issued, authenticated and
         delivered pursuant to the provisions of this Agreement and of the
         Indenture against payment of the consideration thereof in accordance
         with this Agreement, the Offered Securities will be valid and binding
         obligations of the Company and Anadarko enforceable against the Company
         and Anadarko and entitled to the benefits of the Indenture, except to
         the extent enforcement thereof may be limited by bankruptcy,
         insolvency, fraudulent transfer, reorganization, moratorium and other
         similar laws relating to or affecting creditors' rights generally, and
         general principles of equity (whether enforcement is sought in equity
         or at law); and the Notes and Guarantees conform in all material
         respects to the description thereof contained in the Offering Circular.

                  (i) This Agreement has been duly authorized, executed and
         delivered by the Company and Anadarko and constitutes a valid and
         binding agreement of the Company and Anadarko.

                  (j) Neither Anadarko nor any Significant Subsidiary is in
         violation of its certificate of incorporation or by-laws or, in the
         case of a limited liability company, its organizational documents, and
         Anadarko is not in default in the performance or observance of any
         obligation in any indenture, mortgage, evidence of indebtedness or
         similar agreement or instrument to which it is a party or by which it
         or any of its properties may be bound, which default would have a
         material adverse effect on Anadarko and its subsidiaries taken as a
         whole. The execution and delivery of this Agreement and the Indenture
         and the consummation of the transactions contemplated herein and
         therein and the incurrence of the obligations herein and therein set
         forth, have been or will be duly authorized by all necessary corporate
         action. The execution, delivery and performance of the Indenture, this
         Agreement and the Registration Rights Agreement, the issuance and sale
         of the Offered Securities and compliance with the terms and provisions
         thereof will not result in a breach or violation of any of the terms
         and provisions of, or constitute a default under the organizational
         documents of Anadarko and the Company or, except for any such breach,
         violation or default that would not have a material adverse effect on
         Anadarko and its subsidiaries taken as a whole, any statute, rule,
         regulation or order of any governmental agency or body or any court,
         domestic or foreign, having jurisdiction over the Company, Anadarko or
         any of their properties, or any agreement or instrument to which the
         Company or Anadarko is a party or by which the Company or Anadarko is
         bound or to which any of the properties of the Company or Anadarko is
         subject, and the Company and Anadarko have full corporate power and
         authority to authorize, issue and sell the Offered Securities as
         contemplated by this Agreement.

                  (k) The accountants who certified the financial statements
         included or incorporated in the Offering Document are independent
         public accountants as required by the Securities Act and the
         regulations, thereunder.

                  (l) The consolidated financial statements, together with
         related schedules and notes, included or incorporated in the Offering
         Document present fairly the consolidated financial position of Anadarko
         and its subsidiaries as of the dates indicated and the results of their
         operations and the changes in their financial position for the periods
         specified; such financial statements have been prepared in conformity
         with generally accepted accounting principles consistently applied
         during the period, except as stated therein.

                  (m) Since the respective dates as of which information is
         given or incorporated by reference in the Offering Document, except as
         otherwise stated therein or contemplated thereby, there has been (A) no
         material adverse change in the condition, financial or otherwise, of
         Anadarko and its subsidiaries taken as a whole and (B) no litigation or
         governmental proceeding instituted or, to the knowledge of Anadarko,
         threatened against Anadarko or any subsidiary which would reasonably be
         expected to have any material adverse effect on the financial condition
         of Anadarko and its subsidiaries taken as a whole.

                  (n) Anadarko and its subsidiaries possess such valid
         franchises, certificates of convenience and necessity, easements,
         rights-of-way, operating rights, licenses, permits, consents,
         authorizations and orders of governmental political subdivisions or
         regulatory authorities as, in the opinion of Anadarko, are necessary to
         carry on the respective businesses of each as described in the Offering
         Circular, except where the failure to possess such would not
         individually or in the aggregate have a material adverse effect on the
         condition (financial or other), business, properties or results of
         operations of Anadarko and its subsidiaries taken as a whole ("MATERIAL
         ADVERSE EFFECT").




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                  (o) Except as disclosed in the Offering Document and except
         for the registration rights agreements entered into in connection with
         the ZYP-CODES and the 6 3/4% Senior Notes due 2011 and 7 1/2% Senior
         Notes due 2031 issued by the Company, there are no contracts,
         agreements or understandings between Anadarko or any of its affiliates
         and any person granting such person the right to require Anadarko or
         any of its affiliates to file a registration statement under the
         Securities Act with respect to any securities of Anadarko or any of its
         affiliates owned or to be owned by such person or to require Anadarko
         or any of its affiliates to include such securities in the securities
         registered pursuant to the Registration Rights Agreement or in any
         securities being registered pursuant to any other registration
         statement filed by Anadarko or any of its affiliates under the
         Securities Act.

                  (p) Except (i) with respect to the transactions contemplated
         by the Registration Rights Agreement, as may be required under the
         Securities Act and the Trust Indenture Act and (ii) as required by the
         securities or "blue sky" laws of any jurisdiction in connection with
         the purchase and distribution of the Offered Securities by the
         Purchaser, no consent, approval, authorization or order of, or filing
         or registration with, any court or governmental agency or body is
         required for the execution, delivery and performance of this Agreement,
         the Indenture and the Registration Rights Agreement (the "OPERATIVE
         DOCUMENTS") by the Company and Anadarko and the consummation of the
         transactions contemplated hereby and thereby.

                  (q) The Company and Anadarko are not, and upon application of
         the net proceeds from the sale of the Offered Securities as set forth
         in the Offering Circular, will not be, an "investment company" within
         the meaning of such term under the Investment Company Act of 1940, as
         amended, and the rules and regulations thereunder (the "INVESTMENT
         COMPANY ACT").

                  (r) Assuming the accuracy of the representations and
         warranties of the Purchaser contained in Section 4 and its compliance
         with the agreements set forth therein, it is not necessary, in
         connection with the issuance and sale of the Offered Securities to the
         Purchaser, the offer, resale and delivery of the Offered Securities by
         the Purchaser, in each case, in the manner contemplated by this
         Agreement, the Indenture and the Offering Circular, to register the
         Offered Securities under the Securities Act or to qualify the Indenture
         under the Trust Indenture Act of 1939, as amended, and the rules and
         regulations thereunder (collectively, the "TRUST INDENTURE ACT").

                  (s) None of Anadarko or any of its affiliates (other than the
         Purchaser in connection with the transactions contemplated by this
         Agreement about which no representation is made by the Company or
         Anadarko) has, directly or through any agent, sold, offered for sale,
         solicited offers to buy or otherwise negotiated in respect of, any
         "security" (as defined in the Securities Act) which is or will be
         integrated with the sale of the Offered Securities in a manner that
         would require the registration under the Securities Act of the Offered
         Securities.

                  (t) No securities of the same class (within the meaning of
         Rule 144A(d)(3) under the Securities Act) as the Notes or Guarantees
         are listed on any national securities exchange registered under Section
         6 of the Exchange Act or quoted on an automated inter-dealer quotation
         system.

                  (u) None of Anadarko or any of its affiliates (as defined in
         Rule 501(b) of Regulation D under the Securities Act ("REGULATION D")),
         has, directly or through an agent, engaged in any form of general
         solicitation or general advertising in connection with the offering of
         the Offered Securities (as those terms are used in Regulation D) under
         the Securities Act or in any manner involving a public offering within
         the meaning of Section 4(2) of the Securities Act; and the Company and
         Anadarko have not entered into any contractual arrangement with respect
         to the distribution of the Offered Securities except for this Agreement
         and the Company and Anadarko will not enter into any such arrangement.

                  (v) None of Anadarko, its affiliates or any person acting on
         its or their behalf (other than the Purchaser in connection with this
         Agreement) has engaged or will engage in any directed selling efforts
         (as that term is defined in Regulation S) with respect to the Offered
         Securities and each of Anadarko and its affiliates and any person
         acting on its or their behalf (other than the Purchaser in connection
         with this Agreement) has complied and will comply with the offering
         restrictions requirement of Regulation S.



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                  (w) The Company is not subject to Section 13 or 15(d) of the
         Exchange Act.

                  (x) There is no "substantial U.S. market interest" as defined
         in Rule 902(n) of Regulation S in the Company's debt securities.

         3. Purchase, Sale and Delivery of Offered Securities. On the basis of
the representations, warranties and agreements herein contained, but subject to
the terms and conditions herein set forth, the Company agrees to sell to the
Purchaser, and the Purchaser agrees to purchase from the Company, at a purchase
price equal to a percentage of the principal amount thereof plus accrued
interest as reflected on Exhibit A hereto.

         The Company and Anadarko will deliver against payment of the purchase
price the Offered Securities in the form of one or more permanent global
securities in definitive form (the "GLOBAL SECURITIES") deposited with the
Trustee as custodian for The Depository Trust Company ("DTC") and registered in
the name of Cede & Co., as nominee for DTC. Interests in any permanent Global
Securities will be held only in book-entry form through DTC, except in the
limited circumstances described in the Offering Document. Payment for the
Offered Securities shall be made by the Purchaser in Federal (same day) funds by
wire transfer to an account at a bank acceptable to the Purchaser drawn to the
order of the Company at the office of Hughes Hubbard & Reed LLP, One Battery
Park Plaza, New York, N.Y. at 9 A.M. (New York time), on May 23, 2001, or at
such other time, not later than seven full business days thereafter, as the
Purchaser and Anadarko determine, such time being herein referred to as the
"CLOSING DATE", against delivery to the Trustee as custodian for DTC of the
Global Securities representing all of the Offered Securities. The Global
Securities will be made available for checking at the office of the Purchaser at
least 24 hours prior to the Closing Date.

         4. Representations by Purchaser; Resale by Purchaser.

                  (a) The Purchaser represents and warrants to Anadarko and the
         Company that it is an "accredited investor" within the meaning of
         Regulation D under the Securities Act.

                  (b) The Purchaser acknowledges that the Offered Securities
         have not been registered under the Securities Act and may not be
         offered or sold within the United States except pursuant to an
         exemption from, or in a transaction not subject to, the registration
         requirements of the Securities Act. The Purchaser represents and agrees
         that it has not offered or sold, and will not offer or sell, any
         Offered Securities within the United States, except in accordance with
         Rule 144A or Rule 903 under the Securities Act. Accordingly, neither
         the Purchaser nor its affiliates, nor any persons acting on its or
         their behalf, have engaged or will engage in any directed selling
         efforts with respect to the Offered Securities. Terms used in this
         subsection (b) have the meanings given to them by Regulation S.

                  (c) The Purchaser agrees that it and each of its affiliates
         has not entered and will not enter into any contractual arrangement
         with respect to the distribution of the Offered Securities except with
         the prior written consent of Anadarko.

                  (d) The Purchaser agrees that it and each of its affiliates
         will not offer or sell the Offered Securities by means of any form of
         general solicitation or general advertising, within the meaning of Rule
         502(c) under the Securities Act, including, but not limited to (i) any
         advertisement, article, notice or other communication published in any
         newspaper, magazine or similar media or broadcast over television or
         radio, or (ii) any seminar or meeting whose attendees have been invited
         by any general solicitation or general advertising. The Purchaser
         agrees, with respect to resales made in reliance on Rule 144A of any of
         the Offered Securities, to deliver either with the confirmation of such
         resale or otherwise prior to settlement of such resale a notice to the
         effect that the resale of such Offered Securities has been made in
         reliance upon the exemption from the registration requirements of the
         Securities Act provided by Rule 144A.



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         5. Certain Agreements of the Company and Anadarko. Each of the Company
and Anadarko agrees with the Purchaser that:

                  (a) Anadarko will advise the Purchaser promptly of any
         proposal to amend or supplement the Offering Document. If, at any time
         prior to the completion of the resale of the Offered Securities by the
         Purchaser any event occurs as a result of which the Offering Document
         as then amended or supplemented would include an untrue statement of a
         material fact or omit to state any material fact necessary in order to
         make the statements therein, in the light of the circumstances under
         which they were made, not misleading, Anadarko and the Company promptly
         will notify the Purchaser of such event and promptly will prepare, at
         their own expense, an amendment or supplement which will correct such
         statement or omission.

                  (b) Anadarko will furnish to the Purchaser copies of the
         Offering Document and all amendments and supplements to such document,
         in each case as soon as available and in such quantities as the
         Purchaser requests. At any time when Anadarko is not subject to Section
         13 or 15(d) of the Exchange Act, Anadarko will promptly furnish or
         cause to be furnished to the Purchaser and, upon request of holders and
         prospective purchasers of the Offered Securities, to such holders and
         purchasers, copies of the information required to be delivered to
         holders and prospective purchasers of the Offered Securities pursuant
         to Rule 144A(d)(4) under the Securities Act (or any successor provision
         thereto) in order to permit compliance with Rule 144A in connection
         with resales by such holders of the Offered Securities. Anadarko will
         pay the expenses of printing and distributing to the Purchaser all such
         documents.

                  (c) Anadarko will arrange for the qualification of the Offered
         Securities for sale and the determination of their eligibility for
         investment under the laws of such states in the United States as the
         Purchaser designates and will continue such qualifications in effect so
         long as required for the resale of the Offered Securities by the
         Purchaser, provided that Anadarko and the Company will not be required
         to qualify as a foreign corporation or otherwise subject itself to a
         general consent to service of process or taxation in any jurisdiction
         in which it is not otherwise so qualified or subject.

                  (d) During the period of five years hereafter, Anadarko will
         furnish to the Purchaser, as soon as practicable after the end of each
         fiscal year, a copy of Anadarko's annual report to shareholders for
         such year; and Anadarko will furnish to the Purchaser (i) as soon as
         available, a copy of each report and any definitive proxy statement of
         Anadarko filed with the Commission under the Exchange Act or mailed to
         shareholders ; provided, however, that Anadarko shall not be required
         to provide the Purchaser with any such reports or similar forms that
         have been filed with the Commission by electronic transmission pursuant
         to EDGAR.

                  (e) During the period of two years after the Closing Date,
         Anadarko will not, and will not permit any of its affiliates (as
         defined in Rule 144 under the Securities Act) to, resell any of the
         Offered Securities that have been reacquired by any of them.

                  (f) The Company will pay all expenses incidental to the
         performance of its obligations under this Agreement, the Indenture and
         the Registration Rights Agreement, including (i) the fees and expenses
         of the Trustee and its professional advisers; (ii) all expenses in
         connection with the execution, issue, authentication, packaging and
         initial delivery of the Offered Securities and, as applicable, the
         Exchange Securities (as defined in the Registration Rights Agreement),
         the preparation and printing of this Agreement, the Registration Rights
         Agreement, the Offered Securities, the Indenture, the Offering Document
         and amendments and supplements thereto, and any other document relating
         to the issuance, offer, sale and delivery of the Offered Securities and
         as applicable the Exchange Securities; (iii) any expenses (including
         fees and disbursements of counsel) incurred in connection with
         qualification of the Offered Securities or the Exchange Securities for
         sale under the laws of such jurisdictions as the Purchaser designates
         and the printing of memoranda relating thereto, (iv) any fees charged
         by investment rating agencies for the rating of the Offered Securities
         or the Exchange Securities and (v) expenses incurred in distributing
         the Offering Document (including any amendments and supplements
         thereto) to the Purchaser. The Company will reimburse the Purchaser for
         all travel expenses of the Purchaser and the Company's officers and
         employees and any other expenses of the Purchaser and the Company in
         connection with attending or hosting meetings with prospective
         purchasers of the Offered Securities.



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                  (g) In connection with the offering, until the Purchaser shall
         have notified Anadarko of the completion of the resale of the Offered
         Securities, neither Anadarko nor any of its affiliates has or will,
         either alone or with one or more other persons, bid for or purchase for
         any account in which it or any of its affiliates has a beneficial
         interest any Offered Securities or attempt to induce any person to
         purchase any Offered Securities; and neither Anadarko nor any of its
         affiliates will make bids or purchases for the purpose of creating
         actual, or apparent, active trading in, or of raising the price of, the
         Offered Securities.

                  (h) For a forty-five (45) day period commencing on May 16,
         2001, without the Purchaser's Consent, the Company and Anadarko will
         not issue or cause to be issued senior debt securities having a
         maturity of 10 years or more, other than:

                           o        the notes offered hereby;

                           o        any debt securities similar to the notes
                                    offered hereby and issued in exchange
                                    therefore;

                           o        Zero Yield Puttable Contingent Debt
                                    Securities due 2021 issued in exchange for
                                    similar debt securities issued by Anadarko
                                    on March 13, 2001;

                           o        6 3/4% Senior Notes due 2011 and 7 1/2%
                                    Senior Notes due 2031 of the Company,
                                    guaranteed by Anadarko, issued in exchange
                                    for similar debt securities issued by the
                                    Company on April 26, 2001; or

                           o        any debt securities that are convertible
                                    into equity securities.

                  (i) The Company and Anadarko will indemnify and hold harmless
         the Purchaser against any documentary, stamp or similar issuance tax,
         including any interest and penalties, on the creation, issuance and
         sale of the Offered Securities and on the execution and delivery of
         this Agreement. All payments to be made by the Company and Anadarko
         hereunder shall be made without withholding or deduction for or on
         account of any present or future taxes, duties or governmental charges
         whatsoever unless the Company or Anadarko is compelled by law to deduct
         or withhold such taxes, duties or charges. In that event, the Company
         shall pay such additional amounts as may be necessary in order that the
         net amounts received after such withholding or deduction shall equal
         the amounts that would have been received if no withholding or
         deduction had been made.

         6. Conditions of the Obligation of the Purchaser. The obligation of the
Purchaser to purchase and pay for the Offered Securities will be subject to the
accuracy of the representations and warranties on the part of the Company and
Anadarko herein, to the accuracy of the statements of officers of the Company
and Anadarko made pursuant to the provisions hereof, to the performance by the
Company and Anadarko of its obligations hereunder and to the following
additional conditions precedent:

                  (a) The Purchaser shall have received a letter, dated the
         Closing Date, of KPMG LLP confirming that they are independent public
         accountants with respect to Anadarko within the meaning of the
         Securities Act and the applicable published rules and regulations
         thereunder ("RULES AND REGULATIONS") and to the effect that:

                           (i) in their opinion the financial statements
                  examined by them and included in the Offering Document and in
                  the Exchange Act Reports comply as to form in all material
                  respects with the applicable accounting requirements of the
                  Securities Act and the applicable published rules and
                  regulations thereunder; and

                           (ii) they have performed the procedures specified by
                  the American Institute of Certified Public Accountants for a
                  review of interim financial information as described in
                  Statement of Auditing Standards No. 71, Interim Financial
                  Information, on the unaudited financial statements included in
                  the Exchange Act Reports; and stating the conclusions and
                  findings of such firm with




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                  respect to the financial information and other matters
                  ordinarily covered by accountant's "comfort letters" to
                  underwriters in connection with registered public offerings,
                  in form and substance satisfactory to the Purchaser.

                  (b) Subsequent to the execution and delivery of this
         Agreement, there shall not have occurred (i) any material adverse
         change in the condition, financial or otherwise, of Anadarko and its
         subsidiaries taken as a whole, or in the earnings, business or
         operations of Anadarko and its subsidiaries taken as a whole, whether
         or not arising in the ordinary course of business, or (ii) any new
         outbreak of hostilities or other calamity or crisis the effect of which
         on the financial markets of the United States is such as to make it, in
         the reasonable judgment of the Purchaser, impracticable to market the
         Offered Securities or enforce contracts for the sale of Offered
         Securities, or (iii) trading generally on either the American Stock
         Exchange or the New York Stock Exchange has been suspended, or minimum
         or maximum prices for trading have been fixed, or maximum ranges for
         prices for securities have been required, by either of such exchanges
         or by order of the Commission or any other governmental authority, or a
         banking moratorium has been declared by either federal or New York
         authorities. In the event of any such termination, the provisions of
         Sections 5(f), 6, 7 and 8 shall remain in effect.

                  (c) The Purchaser shall have received an opinion, dated
         Closing Date, as follows:

                           (i) from Andrews & Kurth LLP, as counsel to the
                  Company, its written opinion, addressed to the Purchaser, in
                  substantially the form delivered in the 6 3/4% Senior Notes
                  due 2011 and 7 1/2% Senior Notes due 2031 transaction, but
                  with respect to the Offered Securities.

                           (ii) from the General Counsel or an Assistant General
                  Counsel of the Company, his written opinion addressed to the
                  Purchaser, in substantially the form delivered in the 6 3/4%
                  Senior Notes due 2011 and 7 1/2% Senior Notes due 2031
                  transaction, but with respect to the Offered Securities.

                           (iii) from McInnes Cooper, as Canadian counsel to the
                  Company, its written opinion addressed to the Purchaser, in
                  substantially the form delivered in the 6 3/4% Senior Notes
                  due 2011 and 7 1/2% Senior Notes due 2031 transaction, but
                  with respect to the Offered Securities.

                           (iv) from Hughes Hubbard & Reed LLP, as counsel to
                  the Purchaser, its written opinion addressed to the Purchaser,
                  in substantially the form delivered in the 6 3/4% Senior Notes
                  due 2011 and 7 1/2% Senior Notes due 2031 transaction, but
                  with respect to the Offered Securities.

                  (d) The Purchaser shall have received a certificate, dated the
         Closing Date, of the President or any Vice President and a principal
         financial or accounting officer of the Company and Anadarko in which
         such officers, to the best of their knowledge after reasonable
         investigation, shall state that the representations and warranties of
         the Company and Anadarko in this Agreement are true and correct, that
         the Company and Anadarko have complied with all agreements and
         satisfied all conditions on their parts to be performed or satisfied
         hereunder at or prior to the Closing Date, and that, subsequent to the
         date of the most recent financial statements in the Exchange Act
         Reports there has been no material adverse change, nor any development
         or event involving a prospective material adverse change, in the
         condition (financial or other), business, properties or results of
         operations of Anadarko and its subsidiaries taken as a whole except as
         set forth in or contemplated by the Offering Document or as described
         in such certificate.

                  (e) Each of the Company and Anadarko shall have duly executed
         the Operative Documents to which it is a party and delivered such
         Operative Documents to the Purchaser in form and substance reasonably
         satisfactory to the Purchaser.

         The Company and Anadarko will furnish the Purchaser with such conformed
copies of such opinions, certificates, letters and documents as the Purchaser
reasonably requests. The Purchaser may in its sole discretion waive compliance
with any conditions to its obligations hereunder.




                                       8
   9

         7. Indemnification and Contribution.

                  (a) The Company and Anadarko, jointly and severally, agree to
         indemnity and hold harmless the Purchaser and each person, if any, who
         controls the Purchaser within the meaning of either Section 15 of the
         Securities Act or Section 20 of the Exchange Act from and against any
         and all losses, claims, damages and liabilities (including, without
         limitation, any legal or other expenses reasonably incurred in
         connection with defending or investigating any such action or claim)
         caused by any untrue statement or alleged untrue statement of a
         material fact contained in the Offering Document (as amended or
         supplemented if the Company shall have furnished any amendments or
         supplements 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 the Purchaser furnished to the
         Company in writing by the Purchaser expressly for use therein.

                  (b) The Purchaser agrees to indemnify and hold harmless the
         Company, Anadarko and each person, if any, who controls the Company and
         Anadarko within the meaning of either Section 15 and their respective
         officers and directors of the Securities Act or Section 20 of the
         Exchange Act to the same extent as the foregoing indemnity from the
         Company and Anadarko to the Purchaser, but only with reference to
         information relating to the Purchaser furnished to the Company in
         writing by the Purchaser expressly for use in the Offering Document or
         any amendments or supplements thereto, it being understood and agreed
         that the only such information furnished by the Purchaser consists of
         the second and third sentences of the eighth paragraph under the
         caption "Plan of Distribution" in the Offering Circular and the tenth
         paragraph thereof.

                  (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 Section 7(a) or 7(b), 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 (a) 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 Purchaser, in the case of parties
         indemnified pursuant to Section 7(a), and by Anadarko, in the case of
         parties indemnified pursuant to Section 7(b). 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 second and third
         sentences 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 settlement 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.




                                       9
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                  (d) To the extent the indemnification provided for in Section
         7(a) or 7(b) 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
         and Anadarko on the one hand and the Purchaser on the other hand from
         the offering of the Offered Securities or (ii) if the allocation
         provided by clause 7(d)(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 7(d)(i) above but also the relative
         fault of the Company and Anadarko on the one hand and of the Purchaser
         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 and Anadarko on the one hand and the Purchaser on the
         other hand in connection with the offering of the Offered Securities
         shall be deemed to be in the same respective proportions as the net
         proceeds from the offering of the Offered Securities (before deducting
         expenses) received by the Company and Anadarko and the total
         underwriting discounts and commissions received by the Purchaser, in
         each case as set forth in Exhibit A, and in the cross receipt, bear to
         the aggregate offering price of the Offered Securities. The relative
         fault of the Company and Anadarko on the one hand and the Purchaser 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 and Anadarko or by the Purchaser
         and the parties' relative intent, knowledge, access to information and
         opportunity to correct or prevent such statement or omission.

                  (e) The Company and Anadarko and the Purchaser agree that it
         would not be just or equitable if contribution pursuant to this Section
         7 were determined by pro rata allocation or by any other method of
         allocation that does not take account of the equitable considerations
         referred to in Section 7(d). The amount paid or payable by an
         indemnified party as a result of the losses, claims, damages and
         liabilities referred to in the immediately preceding paragraph 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 7, the Purchaser shall
         not be required to contribute any amount in excess of the amount by
         which the total price at which the Offered Securities purchased by it
         and distributed to the public were offered to the public exceeds the
         amount of any damages that the 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 Securities Act) shall be
         entitled to contribution from any person who was not guilty of such
         fraudulent misrepresentation. The remedies provided for in this Section
         7 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.

                  (f) The indemnity and contribution provisions contained in
         this Section 7 and the representations, warranties and other statements
         of the Company and Anadarko contained in this Agreement 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 the Purchaser or any person controlling the Purchaser or by
         or on behalf of the Company or Anadarko, or their officers or directors
         or any person controlling the Company or Anadarko and (iii) acceptance
         of and payment for any of the Offered Securities.

         8. Survival of Certain Representations and Obligations. The respective
indemnities, agreements, representations, warranties and other statements of the
Company or its officers, Anadarko and its officers and of the Purchaser set
forth in or made pursuant to this Agreement will remain in full force and
effect, regardless of any investigation, or statement as to the results thereof,
made by or on behalf of the Purchaser, the Company or any of their respective
representatives, officers or directors or any controlling person, and will
survive delivery of and payment for the Securities. If for any reason the
purchase of the Offered Securities by the Purchaser is not consummated, the
Company shall remain responsible for the expenses to be paid or reimbursed by it
pursuant to Section 5 and the respective obligations of the Company and the
Purchaser pursuant to Section 7 shall remain in effect. If the purchase of the
Offered Securities by the Purchaser is not consummated for any reason other than
solely because of the occurrence of any event specified in clause (iii) of
Section 6(b), the Company will reimburse the Purchaser for all




                                       10
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out-of-pocket expenses (including fees and disbursements of counsel) reasonably
incurred by it in connection with the offering of the Offered Securities.

         9. Notices. All communications hereunder will be in writing and, if
sent to the Purchaser will be mailed, delivered or telegraphed and confirmed to
the Purchaser at Eleven Madison Avenue, New York, N.Y. 10010-3629, Attention:
Transactions Advisory Group, or, if sent to the Company or Anadarko, will be
mailed, delivered or telegraphed and confirmed to it at 17001 Northchase Drive,
Houston, Texas, 77060, Attention: Vice President and Treasurer.

         10. Successors. This Agreement will inure to the benefit of and be
binding upon the parties hereto and their respective successors and the
controlling persons referred to in Section 7, and no other person will have any
right or obligation hereunder, except that holders of Offered Securities shall
be entitled to enforce the agreements for their benefit contained in the second
and third sentences of Section 5(b) hereof against the Company as if such
holders were parties hereto.

         11. Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original, but all such
counterparts shall together constitute one and the same Agreement.

         12. APPLICABLE LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED
IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO
PRINCIPLES OF CONFLICTS OF LAW.




                                       11
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         If the foregoing is in accordance with the Purchaser's understanding of
our agreement, kindly sign and return to each of the Company and Anadarko one of
the counterparts hereof, whereupon it will become a binding agreement by and
among the Company, Anadarko and the Purchaser in accordance with its terms.

                                   Very truly yours,

                                   ANADARKO FINANCE COMPANY

                                            By:  /s/  ALBERT L. RICHEY

                                            Treasurer



                                   ANADARKO PETROLEUM CORPORATION

                                            By:  /s/  ALBERT L. RICHEY

                                            Vice President and Treasurer



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

CREDIT SUISSE FIRST BOSTON CORPORATION

By:  /s/  ROME ARNOLD

Managing Director




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                                                                       EXHIBIT A


                          SELECT TERMS AND CONDITIONS:

                    $550 MILLION 6 3/4% SENIOR NOTES DUE 2011



- ------------------------------- ----------------------- -------------------------- --------------------------
           MATURITY                PRINCIPAL AMOUNT        PRICE TO PURCHASER         PRICE TO THE PUBLIC
                                                         (% of Principal Amount)    (% of Principal Amount)
- ------------------------------- ----------------------- -------------------------- --------------------------
                                                                          
10-Year: May 1, 2011                US$550,000,000               99.634%                    99.634%
- ------------------------------- ----------------------- -------------------------- --------------------------