CNOOC Limited (SEHK: 00883, NYSE: CEO) and Nexen Inc. (TSX: NXY, NYSE: NXY) announced 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.

The purchase price represents a premium of 61% to the closing price of Nexen's common shares on the NYSE on July 20, 2012, and a premium of 66% to Nexen's 20 trading-day volume-weighted average share price. Total cash consideration of approximately US$15.1 billion will be paid for Nexen's common and preferred shares, and Nexen's current debt of approximately US$4.3 billion will remain outstanding. The transaction, which will be completed by way of a plan of arrangement, is expected to close in the fourth quarter of 2012.

The acquisition of Nexen expands CNOOC Limited's overseas businesses and resource base in order to deliver long-term, sustainable growth. Nexen will complement CNOOC Limited's large offshore production footprint in China and extends CNOOC Limited's global presence with a high-quality asset base in many of the world's most significant producing regions - including Western Canada, the U.K. North Sea, the Gulf of Mexico and offshore Nigeria - focused on conventional oil and gas, oil sands and shale gas. In addition, Nexen management's current mandate will be expanded to include all of CNOOC Limited's North American and Caribbean assets.

The transaction will be funded by CNOOC Limited's existing cash resources and external financing.

Mr. Wang Yilin , Chairman of CNOOC Limited said, "The acquisition reflects our strong belief in Nexen's rich and diverse portfolio of assets and world-class management and employees. This is an exciting opportunity for us to build on our existing joint venture relationship with Nexen in Canada, and to acquire a leading international platform in the process. We strongly believe that this acquisition will create long-term value for CNOOC Limited's shareholders."