File photo shows workers of the China National Offshore Oil Corporation (CNOOC) drilling at the Bozhong 13-2 field, which is situated in the middle of the Bohai Sea, 140 km away from north China's Tianjin Municipality. The China National Offshore Oil Corporation (CNOOC) announced Monday that it has discovered a field in the Bohai Sea with estimated reserves of crude oil and natural gas totaling 100 million tonnes of oil equivalent. (Tianjin branch of China National Offshore Oil Corporation (CNOOC)/Handout via Xinhua)
