Media Alert - CNOOC Limited Media Conference Call

CALGARY, July 23, 2012 /PRNewswire/ --

CNOOC Limited (SEHK: 00883, NYSE: CEO) and Nexen Inc. ("Nexen", TSX: NXY, NYSE: NXY) will hold a media conference call today, Mon. July 23, 2012, at 7 a.m. Mountain Time (9 a.m. Eastern Time).

They will discuss their announcement that they have entered into a definitive agreement under which CNOOC Limited will acquire all of the outstanding common shares of Nexen for US$27.50 per share in cash. Media are encouraged to dial in 30 minutes in advance. Only media will be permitted to ask questions.

Details:

• Conference ID#: 13751202
• North America toll-free: (866) 900-8688
• United Kingdom toll-free: 08000323836 or 08000513806
• International Toll: (973) 935-2839

A live audio webcast of the conference call will be available at http://www.newswire.ca/en/webcast/detail/1010667/1092065

A replay of the conference call will be available at (855) 859-2056 or (404) 537-3406 for one week starting at 12 p.m. Eastern Time on Mon. July 23, 2012. To access the replay, callers must provide the Conference ID#: 13751202.

For further information:

Peter Hunt
Spokesperson for CNOOC Limited in Canada
Tel: +1-403-268-7870
Fax: +1-403-299-9389
E-mail: peter.hunt@hkstrategies.ca