SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

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

                                   FORM 6-K

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


                       REPORT OF FOREIGN PRIVATE ISSUER
                     PURSUANT TO RULE 13a-16 OR 15d-16 OF
                      THE SECURITIES EXCHANGE ACT OF 1934


                             For December 12, 2005



                                 CNOOC Limited
                (Translation of registrant's name into English)
                -----------------------------------------------



                                  65th Floor
                              Bank of China Tower
                                One Garden Road
                              Central, Hong Kong
                   (Address of principal executive offices)
                -----------------------------------------------



(Indicate by check mark whether the registrant files or will file annual
reports under cover Form 20-F or Form 40-F)



 Form 20-F      X              Form 40-F
              ---------                     ----------


(Indicate by check mark whether the registrant by furnishing the information
contained in this Form is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of
1934.)



    Yes                            No         X
              ---------                     ----------


(If "Yes" is marked, indicate below the file number assigned to the registrant
                   in connection with Rule 12g3-2(b): N/A.)


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Company Announcement
--------------------

                                [LOGO OMITTED]
                                CNOOC Limited
                (Translation of registrant's name into English)
(Incorporated in Hong Kong with limited liability under the Companies Ordinance)
                               (Stock Code: 883)


                NOTICE OF SECOND EXTRAORDINARY GENERAL MEETING


NOTICE IS HEREBY GIVEN that an extraordinary general meeting of the
shareholders of CNOOC Limited (the "Company") will be held at Island
Shangri-la Hong Kong, Two Pacific Place, Supreme Court Road, Hong Kong on 31
December 2005 at 10:30 am (or such later time as the extraordinary general
meeting of the shareholders of the Company to be held at 10:00 a.m. on 31
December 2005 for the purposes of considering amendments to the articles of
association of the Company and the re-election of directors closes) for the
purpose of considering and, if thought fit, passing, with or without
modification, the following resolutions as Ordinary Resolutions:

                             ORDINARY RESOLUTIONS


1.    "THAT the Supplemental Agreement in relation to certain amendments to
      the Existing Non-Compete Undertaking, a copy of which has been
      initialled by the Chairman and for the purpose of identification marked
      "A", be and is hereby approved, ratified and confirmed and that any
      Director of the Company be and is hereby authorised to do all such
      further acts and things and execute such further documents or
      supplemental agreements or deeds on behalf of the Company and take all
      such steps which in his opinion may be necessary, desirable or expedient
      to implement and/or give effect to the terms of the Supplemental
      Agreement and to make and agree with such changes in the terms of the
      Supplemental Agreement as he may in his discretion consider necessary,
      desirable and expedient and in the interest of the Company."

2.    "THAT the Revised Cap for the "technical services" category of
      continuing connected transactions under the Existing Waiver, as
      described in the circular of the Company dated 10 December 2005 (the
      "Circular"), be and is hereby approved, ratified and confirmed."

3.    "THAT the Non-Exempt Continuing Connected Transactions as described in
      the Circular and set out in the Comprehensive Framework Agreements
      (copies of which have been initialled by the Chairman of the meeting and
      for the purpose of identification marked "B", "C" and "D"), which the
      Company expects to occur on a regular and continuous basis in the
      ordinary and usual course of business of the Company and its
      subsidiaries, as the case may be, and to be conducted on normal
      commercial terms, be and are hereby generally and unconditionally
      approved and that any Director of the Company be and is hereby
      authorised to do all such further acts and things and execute such
      further documents and take all such steps which in their opinion may be
      necessary, desirable or expedient to implement and/or give effect to the
      terms of such transactions."

4.    "THAT the Proposed Caps for each category of the Non-Exempt Continuing
      Connected Transactions, as described in the Circular, be and are hereby
      approved, ratified and confirmed."

5.    "THAT the existing share option scheme of the Company adopted on 4
      February 2001 and amended on 6 June 2002 be and is hereby terminated,
      and the rules of the New Share Option Scheme of the Company (a copy of
      which has been initialled by the Chairman of the meeting and for the
      purpose of identification marked "E") be and are hereby approved and
      adopted as the new share option scheme of the Company subject to and
      conditional upon the Listing Committee of The Stock Exchange of Hong
      Kong Limited granting listing of and permission to deal in the shares of
      the Company, representing 10% of the issued share capital of the Company
      as at the date of passing this resolution, to be issued pursuant to the
      exercise of any options granted under the New Share Option Scheme and
      that the Directors of the Company be and are hereby authorised, at their
      absolute discretion, to grant options thereunder and to allot and issue
      shares of the Company pursuant to the exercise of such option."





                                                           By Order of the Board
                                                                 Cao Yunshi
                                                             Company Secretary


Hong Kong, 10 December 2005

Registered Office:
65th Floor, Bank of China Tower
1 Garden Road
Central
Hong Kong


Notes:

1.    The register of members of the Company will be closed from 28 December
      2005 to 31 December 2005 (both dates inclusive) during which no transfer
      of shares will be registered. In order to qualify for voting at the
      Second EGM, members are reminded to ensure that all instruments of
      transfer of shares accompanied by the relevant share certificate(s),
      must be lodged with the Company's registrar, Hong Kong Registrars
      Limited at Shops 1712-1716, 17/F, Hopewell Centre, 183 Queen's Road
      East, Wanchai, Hong Kong for registration not later than 4:00 p.m. on 23
      December 2005.

2.    A member entitled to attend and vote at the Second EGM convened by this
      notice is entitled to appoint one or more proxies to attend and vote in
      his stead. A proxy need not be a member of the Company.

3.    To be effective, the instrument appointing a proxy together with the
      power of attorney or other authority, if any, under which it is signed
      or a notarially certified copy of that power or authority, must be
      completed and returned to the Company's registered office at 65th Floor,
      Bank of China Tower, 1 Garden Road, Hong Kong, not less than 48 hours
      before the time for holding the Second EGM or any adjournment thereof.

4.    Completion and return of the form of proxy will not preclude you from
      attending and voting in person at the Second EGM or any adjournment
      thereof and, in such event, the relevant form of proxy shall be deemed
      to be revoked.

5.    Where there are joint registered holders of any Share, any one of such
      persons may vote at the Second EGM, either personally or by proxy, in
      respect of such Share as if he were solely entitled thereto; but if more
      than one of such joint registered holders be present at the Second EGM
      personally or by proxy, then the registered holder so present whose name
      stands first on the register of members of the Company in respect of
      such Share will alone be entitled to vote in respect thereof.

6.    Capitalised terms used in this notice have the same meaning as is set
      out in the section entitled "Definitions" at pages 1 to 5 of the
      circular of the Company dated 10 December 2005.

As at the date of this announcement, the Board comprises of:

Executive Directors                     Independent non-executive Directors
Fu Chengyu (Chairman)                   Sung Hong Chiu
Luo Han                                 Kenneth S. Courtis
Zhou Shouwei                            Evert Henkes
Cao Xinghe                              Tse Hau Yin, Aloysius
Wu Zhenfang                             Lawrence J. Lau
Wu Guangqi
Yang Hua


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                                  SIGNATURES

      Pursuant to the requirements of the Securities Exchange Act of 1934, as
amended, the registrant has duly caused this report on Form 6-K to be signed
on its behalf by the undersigned, thereunto duly authorized.

                                             CNOOC Limited


                                             By:  /s/ Cao Yunshi               
                                                  -----------------------------
                                                  Name:  Cao Yunshi
                                                  Title: Company Secretary

Dated: December 12, 2005