July 25, 2012. Anglo-Dutch major Royal Dutch Shell announced that it has signed two offshore oil and gas Production Sharing Contracts (PSCs) with Chinese national oil company CNOOC, and a PSC amendment with CNPC, the parent of PetroChina, for a new development phase of the Changbei gas field in China. Shell reported that it has also entered an agreement with CNOOC for its participation in two Shell exploration blocks offshore Gabon, West Africa. The two offshore oil and gas PSCs with CNOOC are for blocks 62/02 and 62/17 in the Yinggehai Basin. Shell, as operator, will apply advanced seismic acquisition and processing technologies to conduct 3D seismic data surveys in the Yinggehai blocks.