CNOOC Limited, an investment holding company, explores for, develops, produces, and sells crude oil and natural gas in offshore China, Canada, the United States, the United Kingdom, Nigeria, Argentina, Indonesia, Uganda, Iraq, Brazil, Guyana, Russia, Australia, and internationally. The company operates through three segments: E&P, Trading Business, and Corporate. It produces offshore crude oil and natural gas primarily in Bohai, the Western South China Sea, the Eastern South China Sea, and the East China Sea in offshore China.