Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement, make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this announcement.

(Incorporated in Hong Kong with limited liability under the Companies Ordinance)

(Stock Code: 00883) EXTENSION OF THE OUTSIDE DATE OF THE ARRANGEMENT AGREEMENT RELATING TO THE PROPOSED ACQUISITION OF NEXEN

Reference is made to the Company's announcements dated 23 July 2012, 10 August 2012, 21
September 2012 and 6 December 2012, respectively (the "Announcements") and the circular dated 20 December 2012