OREANDA-NEWS. April 28, 2012. CNOOC Limited (the “Company”, NYSE: CEO, SEHK: 00883) announced today it has filed with the United States Securities and Exchange Commission (“SEC”) its 2011 annual report on Form 20-F (“annual report”) that included audited financial statements for the year ended December 31, 2011, reported the press-centre of CNOOC Limited.

The annual report is available on the Company’s website at and also available on the SEC?s website at http://www.sec.gov.

To request a hard copy of the annual report, including the complete audited financial statements free of charge, please contact:

Mr. Cao Yan
IR Manager of Investor Relations Department
CNOOC Limited
Tel: +86-10-8452-1417
Fax: +86-10-8452-1441
E-mail: caoyan@cnooc.com.cn