Nexen Petroleum U.K. Limited Annouces Nexen Inc Acquired by CNOOC Limited


For Immediate Release                                                             26 February 2013


Nexen Petroleum U.K. Limited (the "Company")

The Company‚Äôs ultimate parent company Nexen Inc., has been acquired by CNOOC Limited effective 25 February 2013.  CNOOC Limited is listed on both the Hong Kong Stock Exchange and the New York Stock Exchange.

The business of the Company following the acquisition is expected to remain unchanged.


For further information in relation to the above announcement please contact Lewis Harvey of Nexen Ettrick U.K. Limited, as follows:


Lewis Harvey

t: +44 (0) 1895 275822