File photo of a logo on the wall at the entrance of China National Offshore Oil Corp office tower in Beijing

Reuters
File photo of a logo on the wall at the entrance of China National Offshore Oil Corp office tower in Beijing
A logo is seen on the wall at the entrance of China National Offshore Oil Corp (CNOOC) office tower in Beijing, in this March 20, 2013 file photo. Picture taken March 20, 2013. To match Special Report CNOOC-NEXEN/ REUTERS/Petar Kujundzic/Files (CHINA - Tags: BUSINESS ENERGY LOGO)
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