CNOOC Ltd Makes a New Discovery in Bohai Bay

August 13, 2009

HONG KONG, Aug. 13 /PRNewswire-Asia/ — CNOOC Limited (the “Company” or
“CNOOC Ltd.”, NYSE: CEO; SEHK: 0883) announced today that the Company has
successfully made a new discovery – Qinhuangdao(QHD)35-4 in Shijiutuo Uplift
of Bohai Bay.

(Logo: http://www.prnasia.com/xprn/sa/200701301659.jpg )

New discovery QHD35-4 is located in the south of Shijiutuo Uplift in the
north central of Bohai Bay, and about 38 kilometers western of QHD32-6

The Company has drilled wells on this structure before. The discovery well
QHD35-4-3 penetrated oil pay zones with total thickness of 21.4 meters and
proved QHD35-4 a middle-size oilfield. The well drilled to a total depth of
2,215 meters, with water depth of about 26 meters.

During the drill stem test, the well was tested to flow at an average rate
of 1,700 barrels of oil and 400 thousand cubic feet of natural gas per day via
11.11mm choke.

Mr. Zhu Weilin, Executive Vice President of the Company and General
Manager of Exploration Department commented, “New discovery QHD 35-4 is one of
discoveries the Company has made around Shijiutuo Uplift. This area is
expected to become new growth point of our reserves.”

Notes to Editors:

More information about the Company is available at
http://www.cnoocltd.com .

This press release includes “forward-looking statements” within the
meaning of the United States Private Securities Litigation Reform Act of 1995,
including statements regarding expected future events, business prospectus or
financial results. The words “believe,” “intend,” “expect,” “anticipate,”
“project,” “estimate,” “plan,” “predict” and similar expressions are intended
to identify such forward-looking statements. These statements are based on
assumptions and analyses made by us that we believe are reasonable under the
circumstances. However, whether actual results and developments will meet our
expectations and predictions depend on a number of risks and uncertainties
which could cause our actual results, performance and financial condition to
differ materially from our expectations. For a description of these and other
risks and uncertainties, please see the documents we file from time to time
with the United States Securities and Exchange Commission, including our 2007
Annual Report on Form 20-F filed on June 26, 2008.

    For further enquiries, please contact:

     Mr. Xiao Zongwei
     Joint Company Secretary and General Manager
     of Investor Relations Department
     CNOOC Limited
     Tel:   +86-10-8452-1646
     Fax:   +86-10-8452-1441
     Email: xiaozw@cnooc.com.cn

     Ms. Sharon Fung
     Ketchum Newscan Public Relations Ltd
     Tel:   +852-3141-8082
     Fax:   +852-2510-8199
     Email: Sharon.fung@knprhk.com


Source: newswire

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