Royal Dutch Shell PLC has sold its 80-percent stake in Pecten Cameroon Co. to the Chinese-owned Addax Petroleum Corp., the Sinopec International Petroleum Exploration and Production Corp.(SIPC) said Thursday. The deal was completed on Oct. 31, the SIPC said. Addax Petroleum, a wholly-owned subsidiary of the SIPC, paid 538 million U.S. dollars for Shell\'s 80-percent stake, according to an agreement signed by the companies in May. The SIPC is a wholly-owned subsidiary of the Sinopec Group. The deal marks the first time for the Sinopec Group to gain access to Cameroon\'s oil and gas reserves, the SIPC said.