CNOOC is a state-owned enterprise belonging to Sinopec. China crude oil field is a large state-owned enterprise under China Petroleum and Chemical Corporation, headquartered in Puyang City, Henan Province. China's crude oil field is subordinate to Sinopec, is a state-owned mega-enterprise, is also Sinopec's largest central enterprise in Henan, Sinopec's second largest oil and gas branch, mainly engaged in oil and gas exploration and development, engineering and technical services, oil and gas sales, oil and gas production logistical support, public utility engineering services, housing leasing, staff training, hotels and restaurants, etc., is the domestic petroleum and petrochemical industry chain is the most complete, the business surface is the most extensive, the first outside the intrusion It is the oil and gas company with the most complete chain in the domestic petroleum and petrochemical industry, the widest business scope, the earliest market entry, and the first to realize the synergistic operation of upstream, midstream and downstream industry chain. Zhongyuan Oilfield has a total mineral rights area of 15,405.164 square kilometers, oil resources of 2,088 million tons, natural gas resources of 1,845.102 billion cubic meters, proven geological reserves of 625.8 million tons of oil, natural gas geological reserves of 483.336 billion cubic meters. The exploration and development areas include the old Dongpu area across Henan and Shandong, the Sichuan Puguang gas field, the Tongnanba block, and the Inner Mongolia exploration area. Annual production of 1.275 million tons of crude oil, natural gas 6.616 billion cubic meters, 1.73 million tons of sulfur yellow, net profit of 1.05 billion yuan.