OREANDA-NEWS. April 30, 2013. CNOOC Limited (the “Company”, NYSE: CEO, SEHK: 00883) announced today it has filed with the United States Securities and Exchange Commission (“SEC”) its 2012 annual report on Form 20-F (“annual report”) that included audited financial statements for the year ended December 31, 2012.

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:

Ms. Starry Ding

IR Manager of Investor Relations Department

CNOOC Limited

Tel: +86-10-8452-2973

Fax: +86-10-8452-1441

E-mail: IR@cnooc.com.cn