CNOOC Limited (the “Company”, together with its subsidiaries, the “Group” or “we”), incorporated in Hong Kong Special Administration Region (“Hong Kong”) in August 1999, was listed on the New York Stock Exchange (code: CEO) and The Stock Exchange of Hong Kong Limited (code: 00883) on 27 and 28 February 2001, respectively. The Company was admitted as a constituent stock of the Hang Seng Index in July 2001.

The Group is China's largest producer of offshore crude oil and natural gas and one of the largest independent oil and gas exploration and production companies in the world. The Group mainly engages in oil and natural gas exploration, development, production and sales.

The Group has four major production areas in offshore China, which are Bohai Bay, Western South China Sea, Eastern South China Sea and East China Sea. In addition, it is one of the largest offshore crude oil producers in Indonesia. The Group also has upstream assets in Nigeria, Australia and some other countries.

As at 31 December 2009, the Group owned net proved reserves of approximately 2.66 billion BOE, and its average daily net production was 623,896 BOE. The Group had 4,019 employees and total assets of approximately RMB 242.3 billion.