Joint Investigation Team Announced the Investigation Conclusions on Penglai 19-3 Oil Spill Accident

HONG KONG, Nov. 11, 2011 /PRNewswire-Asia/ -- CNOOC Limited noticed that on November 11, 2011, State Oceanic Administration of People's Republic of China announced on its official website that, according to the conclusions made by Joint Investigation Team, ConocoPhillips China Inc ('COPC') violated the Overall Development Plan during the production process on Penglai 19-3 oil field, had defects in its procedures and management, and did not take necessary measures after obvious accident signs emerged. All of these eventually resulted in an accident involving liabilities, causing severe oceanic pollution by oil spill.

As a non-Operator, the Company will assist COPC to deal with the subsequent issues in a proper manner

Penglai 19-3 is an oil field operated under a Production Sharing Contract ('PSC'). COPC is the Operator and responsible for the management of daily operations. The Company holds 51% of participating interest during the development and production phase under the PSC.


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 analysis made by the Company in light of its experience and perception of historical trends, current conditions and expected future developments, as well as other factors that the Company believes reasonable under the circumstances. However, whether actual results and developments will meet the Company's expectations and predictions depends on a number of risks and uncertainties which could cause the actual results, performance and financial conditions to differ materially from the Company's expectations, including those associated with fluctuations in crude oil and natural gas prices, the exploration or development activities, the capital expenditure requirements, the business strategy, the highly competitive nature of the oil and natural gas industries, the foreign operations, environmental liabilities and compliance requirements, and economic and political conditions in the People's Republic of China. For a description of these and other risks and uncertainties, please see the documents the Company has filed from time to time with the United States Securities and Exchange Commission, including 2010 Annual Report on Form 20-F filed on April 29, 2011.

Consequently, all of the forward-looking statements made in this press release are qualified by these cautionary statements. The Company cannot assure that the actual results or developments anticipated will be realized or, even if substantially realized, that they will have the expected effect on the Company, its business or operations.

For further enquiries, please contact:

Mr. Jiang Yongzhi

Joint Company Secretary and General Manager of Investor Relations Department

CNOOC Limited

Tel: +86-10-8452-1731

Fax: +86-10-8452-1441

E-mail: jiangyzh2@cnooc.com.cn

Ms. Ding Jianchun

Manager, Media / Public Relations

CNOOC Limited

Tel: +86-10-8452-2973

Fax: +86-10-8452-1441

E-mail: dingjch@cnooc.com.cn

Ms. Angela Hui

Ketchum Newscan Public Relations Ltd

Tel: +852-3141-8091

Fax: +852-2510-8199

E-mail: angela.hui@knprhk.com

CNOOC Limited

Web site: http://www.cnoocltd.com/

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