CNOOC is divided into several branches.

CNOOC has the following three directly affiliated branches or subsidiaries in Guangdong: 1 CNOOC (China) Co., Ltd. Zhanjiang Branch CNOOC (China) Co., Ltd. Zhanjiang Branch (hereinafter referred to as "Zhanjiang Branch") is a branch of China National Offshore Oil Corporation, which is controlled by China National Offshore Oil Corporation.