As filed with the Securities and Exchange Commission on April 3, 2006

                                                     Registration No. 333-130967





                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                         POST-EFFECTIVE AMENDMENT NO. 1
                                   ON FORM S-8
                                   TO FORM S-4
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                                 CONOCOPHILLIPS
             (Exact name of Registrant as Specified in its Charter)

                Delaware                                 01-0526944
   (State or Other Jurisdiction of         (I.R.S. Employer Identification No.)
     Incorporation or Organization)
     600 North Dairy Ashford Road
            Houston, Texas                                 77079
 (Address of Principal Executive Offices)                (Zip Code)


1993  Burlington  Resources Inc.  ("BR") Stock  Incentive Plan; BR 1997 Employee
Stock  Incentive  Plan; BR 2002 Stock  Incentive Plan; BR 2000 Stock Option Plan
for  Non-Employee   Directors;  BR  1992  Stock  Option  Plan  for  Non-Employee
Directors; The Louisiana Land and Exploration Company ("LL&E") 1995 Stock Option
Plan;  LL&E 1988 Long-Term  Stock Incentive Plan; LL&E Long-Term Stock Incentive
Plan;  Burlington  Resources Inc. Retirement Savings Plan; Employee Savings Plan
for Eligible Employees of Burlington Resources Canada Ltd.


                              (Full Title of Plans)
                              ---------------------

                             STEPHEN F. GATES, ESQ.
                SENIOR VICE PRESIDENT, LEGAL AND GENERAL COUNSEL
                                 CONOCOPHILLIPS
                          600 NORTH DAIRY ASHFORD ROAD
                              HOUSTON, TEXAS 77079
                     (NAME AND ADDRESS OF AGENT FOR SERVICE)

                                 (281) 293-1000
          (Telephone Number, Including Area Code, of Agent for Service)
                              ---------------------

         Approximate date of commencement of proposed sale to employees: From
time to time after the effective date of this Registration Statement and the
effective time of the merger of Burlington Resources Inc. with and into a wholly
owned subsidiary of ConocoPhillips.

                         CALCULATION OF REGISTRATION FEE

                                                                                                 

------------------------------------------ --------------------- --------------------- --------------------- ------------------
                                                                   PROPOSED MAXIMUM      PROPOSED MAXIMUM        AMOUNT OF
         TITLE OF EACH CLASS OF                AMOUNT TO BE         OFFERING PRICE      AGGREGATE OFFERING     REGISTRATION
       SECURITIES TO BE REGISTERED            REGISTERED (2)        PER SHARE (3)           PRICE (3)             FEE (3)
------------------------------------------ ---------------------                                             ------------------
------------------------------------------ --------------------- --------------------- --------------------- ------------------
Common Stock, $0.01 par value (1)               7,642,488                N/A                   N/A                  N/A
------------------------------------------ --------------------- --------------------- --------------------- ------------------




(1)  Includes the associated rights to purchase ConocoPhillips preferred stock,
     which initially are attached to and trade with the shares of ConocoPhillips
     common stock being registered hereby.
(2)  This Post-Effective Amendment No. 1 on Form S-8 covers up to 7,642,488
     shares of common stock, par value $0.01 per share, of ConocoPhillips
     originally registered on ConocoPhillips' Registration Statement on Form S-4
     (File No. 333-130967), as amended, initially filed with the Securities and
     Exchange Commission on January 11, 2006, to which this Amendment relates
     (the "Registration Statement").
(3)  Not applicable. All filing fees payable in connection with the registration
     of these securities were paid in connection with the filing of the
     Registration Statement.
Note: Pursuant to Rule 416(c) under the Securities Act of 1933, this
     Registration Statement also covers an indeterminate amount of interests to
     be offered and sold pursuant to the Burlington Resources Inc. Retirement
     Savings Plan and the Employee Savings Plan for Eligible Employees of
     Burlington Resources Canada Ltd.




                                EXPLANATORY NOTE

                  ConocoPhillips ("ConocoPhillips" or the "Registrant") hereby
amends its Registration Statement on Form S-4 (the "Form S-4") by filing this
Post-Effective Amendment No. 1 on Form S-8 to Form S-4 (this "Amendment")
relating to 7,642,488 shares of common stock, par value $0.01 per share, of
ConocoPhillips ("ConocoPhillips Common Stock") issuable by ConocoPhillips in
connection with the following employee benefit plans of Burlington Resources
Inc. ("BR") and its subsidiaries: 1993 BR Stock Incentive Plan; BR 1997 Employee
Stock Incentive Plan; BR 2002 Stock Incentive Plan; BR 2000 Stock Option Plan
for Non-Employee Directors; BR 1992 Stock Option Plan for Non-Employee
Directors; The Louisiana Land and Exploration Company ("LL&E") 1995 Stock Option
Plan; LL&E 1988 Long-Term Stock Incentive Plan; LL&E Long-Term Stock Incentive
Plan; Burlington Resources Inc. Retirement Savings Plan; Employee Savings Plan
for Eligible Employees of Burlington Resources Canada Ltd. Pursuant to Rule
416(c) under the Securities Act of 1933, this Registration Statement also covers
an indeterminate amount of interests to be offered and sold pursuant to the
Burlington Resources Inc. Retirement Savings Plan and the Employee Savings Plan
for Eligible Employees of Burlington Resources Canada Ltd. All such shares of
ConocoPhillips Common Stock were originally registered under the Securities Act
of 1933, as amended (the "Securities Act"), pursuant to the Form S-4.

                  On March 31, 2006, BR, a Delaware corporation, merged with and
into Cello Acquisition Corp. ("Cello"), a Delaware corporation and a wholly
owned subsidiary of ConocoPhillips (the "Merger"), pursuant to the Agreement and
Plan of Merger (the "Merger Agreement"), dated as of December 12, 2005, by and
among ConocoPhillips, Cello and BR. At the time the Merger was consummated (the
"Effective Time"), among other things, each issued and outstanding share of BR
Common Stock, par value $.01 per share ("BR Common Stock"), other than shares
held by ConocoPhillips, BR and their subsidiaries, was converted into the right
to receive 0.7214 shares of ConocoPhillips Common Stock and $46.50 in cash.
Pursuant to the Merger Agreement, each then outstanding option to purchase
shares of BR Common Stock, or BR stock options, was converted into an option to
acquire a number of shares of ConocoPhillips Common Stock equal to the product
of (a) the number of shares of BR Common Stock subject to such option
immediately prior to the Effective Time multiplied by (b) the Stock Award
Exchange Ratio (as defined in the next sentence), rounded down to the nearest
whole share. The "Stock Award Exchange Ratio" means the sum of 0.7214 and a
fraction, the numerator of which is $46.50 and the denominator of which is the
closing per share price of ConocoPhillips Common Stock on the NYSE on the last
trading day immediately preceding the closing date of the Merger.

                  In addition, at the Effective Time, each then outstanding
share of restricted BR Common Stock granted prior to the signing of the Merger
Agreement pursuant to the BR stock plans vested and was treated in the same
manner as other shares of BR Common Stock. Shares of restricted BR Common Stock
granted pursuant to the BR stock plans after the signing of the Merger Agreement
which were outstanding at the Effective Time did not vest at the Effective Time
but instead will remain subject to their original terms (including provisions
for acceleration of vesting upon certain qualifying terminations of employment
following the Effective Time). Those unvested shares of restricted BR Common
Stock were converted at the Effective Time into a number of shares of
ConocoPhillips Common Stock determined by multiplying the





number of shares of BR Common Stock subject to such award immediately prior to
the Effective Time by the Stock Award Exchange Ratio.

                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(A) PROSPECTUS

                  All information required by Part I to be contained in the
prospectus is omitted from this Amendment in accordance with Rule 428 under the
Securities Act.

                                    PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT


ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE

                  The following documents previously filed by ConocoPhillips
with the Securities and Exchange Commission (the "Commission") pursuant to the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), are
incorporated herein by reference:

(a)      ConocoPhillips' Annual Report on Form 10-K for the fiscal year ended
         December 31, 2005.

(b)      ConocoPhillips' Current Reports on Form 8-K as filed with the SEC on
         February 16, 2006; February 22, 2006; March 20, 2006; March 31, 2006;
         and on Form 8-K/A as filed with the SEC on April 3, 2006.

(c)      The description of ConocoPhillips common stock set forth in a
         registration statement filed pursuant to Section 12 of the Exchange Act
         and any amendment or report filed for the purpose of updating that
         description.

                  All documents subsequently filed by ConocoPhillips pursuant to
Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act prior to the filing of a
post-effective amendment which indicates that all securities offered hereby have
been sold or which deregisters all securities then remaining unsold, shall be
deemed incorporated by reference in this Registration Statement and to be a part
hereof from the date of filing of such documents. Any statement contained herein
or in a document incorporated or deemed to be incorporated by reference herein
shall be deemed to be modified or superseded for purposes of this Registration
Statement to the extent that a statement contained herein or in any subsequently
filed document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Registration Statement.





ITEM 4.  DESCRIPTION OF SECURITIES

                  Not applicable.

ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL

                  The legality of the shares of ConocoPhillips Common Stock to
be issued in connection with the Plans was passed upon for ConocoPhillips by
Stephen F. Gates, Esq., Senior Vice President, Legal, and General Counsel for
ConocoPhillips.

                  The consolidated financial statements, condensed consolidating
financial information and financial statement schedule of ConocoPhillips
appearing in ConocoPhillips' Annual Report (Form 10-K) for the year ended
December 31, 2005 and ConocoPhillips' management's assessment of the
effectiveness of internal control over financial reporting as of December 31,
2005 included therein, have been audited by Ernst & Young LLP, independent
registered public accounting firm, as set forth in their reports thereon,
included therein, and incorporated herein by reference. Such consolidated
financial statements, condensed consolidating financial information, financial
statement schedule and management's assessment are incorporated herein by
reference in reliance upon such reports given on the authority of such firm as
experts in accounting and auditing.

                  The consolidated financial statements of Burlington Resources
Inc., incorporated herein by reference to ConocoPhillips' Current Report on Form
8-K/A dated March 31, 2006, have been so incorporated in reliance on the report
of PricewaterhouseCoopers LLP, an independent registered public accounting firm,
given on the authority of said firm as experts in auditing and accounting.

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

         ConocoPhillips is incorporated under the laws of the state of Delaware.
Section 102 of the Delaware General Corporation Law (the "DGCL") allows a
corporation to eliminate the personal liability of directors of a corporation to
the corporation or to any of its stockholders for monetary damages for a breach
of fiduciary duty as a director, except (i) for breach of the director's duty of
loyalty, (ii) for acts or omissions not in good faith or that involve
intentional misconduct or a knowing violation of law, (iii) for certain unlawful
dividends and stock repurchases or (iv) for any transaction from which the
director derived an improper personal benefit. Article NINTH of the Company's
Restated Certificate of Incorporation (the "Certificate"), provides that no
director shall be personally liable to the Company or its stockholders for
monetary damages for any breach of his fiduciary duty as a director, except as
provided in Section 102 of the DGCL.

         Section 145 of the DGCL provides that in the case of any action other
than one by or in the right of the corporation, a corporation may indemnify any
person who was or is a party, or is threatened to be made a party to any action,
suit or proceeding, whether civil, criminal, administrative or investigative, by
reason of the fact that such person is or was a director, officer, employee or
agent of the corporation, or is or was serving at the request of the corporation
in such capacity on behalf of another corporation or enterprise, against
expenses (including





attorney's fees), judgments, fines and amounts paid in settlement actually and
reasonably incurred by him in connection with such action if he acted in good
faith and in a manner he reasonably believed to be in, or not opposed to, the
best interests of the corporation and, with respect to any criminal action or
proceeding, had no reasonable cause to believe his conduct was unlawful.

         Section 145 of the DGCL provides that in the case of an action by or in
the right of a corporation to procure a judgment in its favor, a corporation may
indemnify any person who was or is a party, or is threatened to be made a party
to any action or suit by reason of the fact that such person is or was a
director, officer, employee or agent of the corporation, or is or was serving at
the request of the corporation in such capacity on behalf of another corporation
or enterprise, against expenses (including attorneys' fees) actually and
reasonably incurred by him in connection with the defense or settlement of such
action or suit if he acted under standards similar to those set forth in the
preceding paragraph, except that no indemnification may be made in respect of
any action or claim as to which such person shall have been adjudged to be
liable to the corporation, unless a court determines that such person is fairly
and reasonably entitled to indemnification.

         Article VIII of the Company's Bylaws provides for indemnification of
any person who was, is or is threatened to be made, a party to any action, suit
or proceeding by reason of the fact that he is or was a director, officer or
employee of the Company, or was serving at the request of the Company in that
capacity for another entity, to the fullest extent permitted by the DGCL.

         Directors and officers of the Company are insured, at the expense of
the Company, against certain liabilities which might arise out of their
employment and which might not be subject to indemnification under the Bylaws.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED

                  Not Applicable.

ITEM 8.  EXHIBITS

                  See Exhibit Index.

ITEM 9.  UNDERTAKINGS

         (a)    The undersigned Registrant hereby undertakes:

                (1)      To file, during any period in which offers or sales are
                         being made, a post-effective amendment to this
                         Registration Statement:

                        (i)     To include any prospectus required by Section
                                10(a)(3) of the Securities Act;

                        (ii)    To reflect in the prospectus any facts or
                                events arising after the effective date of this
                                Registration Statement (or the most recent
                                post-effective





                                amendment hereof) which, individually or in the
                                aggregate, represent a fundamental change in the
                                information set forth in this Registration
                                Statement;

                        (iii)   To include any material information with
                                respect to the plan of distribution not
                                previously disclosed in this Registration
                                Statement or any material change to such
                                information in this Registration Statement;

         provided, however, that paragraphs (1)(i) and (1) (ii) do not apply if
         the information required to be included in a post-effective amendment
         by those paragraphs is contained in periodic reports filed with or
         furnished to the Securities and Exchange Commission by the Registrant
         pursuant to Section 13 or Section 15(d) of the Exchange Act that are
         incorporated by reference in this Registration Statement.

                (2)      That, for the purpose of determining any liability
                         under the Securities Act, each such post-effective
                         amendment shall be deemed to be a new registration
                         statement relating to the securities offered therein,
                         and the offering of such securities at that time shall
                         be deemed to be the initial bona fide offering thereof.

                (3)      To remove from registration by means of a
                         post-effective amendment any of the securities being
                         registered which remain unsold at the termination of
                         the offering.

         (b)    The undersigned Registrant hereby undertakes that, for
purposes of determining any liability under the Securities Act, each filing of
the Registrant's annual report pursuant to Section 13(a) or 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in this Registration Statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

         (c)    Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers and controlling persons
of the Registrant pursuant to the foregoing provisions, or otherwise, the
Registrant has been advised that in the opinion of the Commission such
indemnification is against public policy as expressed in the Securities Act and
is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a director, officer or controlling person of the Registrant
of expenses incurred or paid by a director, officer or controlling person of the
Registrant in the successful defense of any action, suit or proceeding) is
asserted by such director, officer or controlling person in connection with the
securities being registered, the Registrant will, unless in the opinion of its
counsel the matter has been settled by controlling precedent, submit to a court
of appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.








                                   SIGNATURES

                  Pursuant to the requirements of the Securities Act, the
registrant has duly caused this Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Houston,
Texas, on April 3, 2006.

                                      CONOCOPHILLIPS


                                      By:  /s/ James J. Mulva*
                                          --------------------------------------
                                           James J. Mulva
                                           Chairman of the Board, President and
                                           Chief Executive Officer


                  Pursuant to the requirements of the Securities Act of 1933,
this Registration Statement has been signed by the following persons in the
capacities indicated below, on this 3rd day of April, 2006.

PRINCIPAL EXECUTIVE OFFICERS (AND DIRECTORS)       DIRECTORS
/s/ James J. Mulva*
James J. Mulva,                                    Richard L. Armitage+
Chairman of the Board, President and
Chief Executive Officer                            /s/ Richard H. Auchinleck*
                                                   Richard H. Auchinleck
PRINCIPAL FINANCIAL OFFICER
                                                   /s/ Norman R. Augustine*
/s/ John A. Carrig*                                Norman R. Augustine
John A. Carrig,
Executive Vice President, Finance,                 /s/ James E. Copeland*
and Chief Financial Officer                        James E. Copeland

PRINCIPAL ACCOUNTING OFFICER                       /s/ Kenneth R. Duberstein*
/s/ Rand C. Berney*                                Kenneth R. Duberstein
Rand C. Berney,
Vice President and Controller                      /s/ Ruth R. Harkin*
                                                   Ruth R. Harkin

                                                   /s/ Larry D. Horner*
                                                   Larry D. Horner

                                                   /s/ Charles C. Krulak*
                                                   Charles C. Krulak

                                                   /s/ Harold McGraw III*
                                                   Harold McGraw III

                                                   /s/ Harald Norvik*
                                                   Harald Norvik

                                                   /s/ William K. Reilly*
                                                   William K. Reilly




                                                   /s/ William R. Rhodes*
                                                   William R. Rhodes

                                                   /s/ J. Stapleton Roy*
                                                   J. Stapleton Roy


                                                   Bobby S. Shackouls+

                                                   /s/ Victoria J. Tschinkel*
                                                   Victoria J. Tschinkel

                                                   /s/ Kathryn C. Turner*
                                                   Kathryn C. Turner


                                                   William E. Wade, Jr. +

*By:     /s/ Stephen F. Gates
         Stephen  F. Gates,
         Attorney-in-Fact

+ Board members appointed as of March 31, 2006.










         BURLINGTON RESOURCES INC. RETIREMENT SAVINGS PLAN AND EMPLOYEE SAVINGS
PLAN FOR ELIGIBLE EMPLOYEES OF BURLINGTON RESOURCES CANADA LTD. Pursuant to the
requirements of the Securities Act of 1933, the trustees (or other persons who
administer the Burlington Resources Inc. Retirement Savings Plan and Employee
Savings Plan for Eligible Employees of Burlington Resources Canada Ltd.) have
duly caused this registration statement to be signed on behalf of the Burlington
Resources Inc. Retirement Savings Plan and Employee Savings Plan for Eligible
Employees of Burlington Resources Canada Ltd. by the undersigned, thereunto duly
authorized, in the City of Houston, State of Texas, on April 3, 2006.

                           BURLINGTON RESOURCES INC. RETIREMENT SAVINGS PLAN

                           EMPLOYEE SAVINGS PLAN FOR ELIGIBLE EMPLOYEES OF
                           BURLINGTON RESOURCES CANADA LTD.

                           (Plans)


                           By: /s/ J.W. Sheets
                               -------------------------------------------------
                               Name: J.W. Sheets
                               Title: Administrator









                                  EXHIBIT INDEX


     Exhibit                          Description
     Number
       4.1         Restated Certificate of Incorporation of ConocoPhillips,
                   filed as Exhibit 3.1 to ConocoPhillips' Form 8-K, dated
                   August 30, 2002, and incorporated herein by reference.

       4.2         By-Laws of ConocoPhillips, as amended on February 4, 2005
                   (incorporated by reference to Exhibit 99.1 to the Current
                   Report of ConocoPhillips on Form 8-K filed on February 10,
                   2005; File No. 001-323395).

       4.3         Rights Agreement, dated as of June 30, 2002, between
                   ConocoPhillips and Mellon Investor Services LLC as rights
                   agent, which includes as Exhibit A the form of Certificate of
                   Designations of Series A Junior Participating Preferred
                   Stock, as Exhibit B to the form of Rights Certificate and as
                   Exhibit C to the Summary of Rights to Purchase Preferred
                   Stock (incorporated by reference to Exhibit 4.1 to the Form
                   8-K).

       5.1         Opinion of Stephen F. Gates, Esq., Senior Vice President,
                   Legal, and General Counsel to ConocoPhillips (previously
                   filed as exhibit 5.1 to Pre-Effective Amendment No. 1 to
                   Form S-4).

       8.1         Opinion of Wachtell, Lipton, Rosen and Katz regarding certain
                   U.S. federal income tax consequences relating to the merger.

       8.2         Opinion of White & Case LLP regarding certain U.S. federal
                   income tax consequences relating to the merger.

      23.1         Consent of Ernst & Young LLP.

      23.2         Consent of PricewaterhouseCoopers LLP.

      23.3         Consent of Stephen F. Gates (included in the opinion
                   previously filed as exhibit 5.1 to Pre-Effective Amendment
                   No. 1 to Form S-4).

      23.4         Consent of Wachtell, Lipton, Rosen and Katz (included in the
                   opinion filed as Exhibit 8.1 to this Registration Statement).

      23.5         Consent of White & Case LLP (included in the opinion filed as
                   exhibit 8.2 to this Registration Statement).

      24.1         Powers of Attorney.*

* Previously filed on January 11, 2006.