CNOOC Ltd. Made Important Discovery PL9-1 in Bohai Bay

April 19, 2010

HONG KONG, April 19 /PRNewswire-Asia/ — CNOOC Limited (the “Company” or
“CNOOC Ltd.”, NYSE: CEO, HKEx: 0883) announced today that the Company has
successfully made an important new discovery — Penglai(PL)9-1 in the Eastern
Bohai Bay.

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

The new discovery — PL9-1 is located in the Miaoxibei Uplift in the
Eastern Bohai Bay. The discovery well PL9-1-2 penetrated oil pay zones with
total thickness of 77 meters and fractured zone of buried hill with total
thickness of 158 meters. The well drilled to a total depth of 1,505 meters,
with water depth of about 29 meters.

The Company has conducted drill stem test for three layers, and during the
test the well flowed at an average rate of 540 barrels of oil per day.

Mr. Zhu Weilin, Executive Vice President of the Company and General
Manager of Exploration Department commented, “This discovery opens up a new
prospect for exploration in Bohai Bay. We believe that with further appraisals
in the future PL9-1 is expected to become a significant discovery in this

    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 2008
Annual Report on Form 20-F filed on May 8, 2009.

    For further enquiries, please contact:

     Mr. Jiang Yongzhi
     Joint Company Secretary and General Manager
     Investor Relations Department
     CNOOC Limited
     Tel:   +86-10-8452-1731
     Fax:   +86-10-8452-1441
     Email: jiangyzh2@cnooc.com.cn

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


Source: newswire

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