CNOOC Ltd is a China-based company principally engaged in the exploration, development, production, and sale of crude oil and natural gas. The Company is mainly engaged in its business through three segments. The Exploration and Production segment is involved in upstream oil activities, including conventional oil and gas, shale oil and gas, oil sands, and other unconventional oil and gas operations. The Trading Business segment is engaged in crude oil trading, including the sale of crude oil and natural gas under production sharing contracts with foreign partners and third-party crude oil trading. The Corporate Business segment is involved in headquarters management, capital management, and research and development activities. The Company mainly operates in the domestic and overseas markets.