The four executives are Wang Yongchun, deputy general manager of the CNPC; Li Hualin, deputy general manager of the CNPC; Ran Xinquan, vice president of PetroChina and Wang Daofu, chief geologist of PetroChina.
The ruling Communist Party's CNPC committee said that the four have been relieved of party-related posts and corporate administrative posts and their job titles will be removed following due procedures.
The CNPC has appointed Liu Hongbin, Wen Qingshan, Zhao Zhengzhang and Zhao Wenzhi to take over their positions.