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Anadarko Petroleum Corporation engages in the exploration, development, production, and marketing of oil and gas properties. It operates through three segments: Exploration and Production, WES Midstream, and Other Midstream. The company explores for and produces oil, natural gas, and natural gas liquids (NGLs). It is also involved in gathering, processing, treating, and transporting oil, natural-gas, and NGLs production, as well as the gathering and disposal of produced water. The company's oil and natural gas properties are located in the United States onshore and deepwater Gulf of Mexico; and Algeria, Ghana, Mozambique, Colombia, Peru, and other countries. As of December 31, 2018, it had approximately 1.5 billion barrels of oil equivalent of proved reserves. The company was founded in 1959 and is headquartered in The Woodlands, Texas.

Cnooc Limited is a company that engages primarily in the exploration, development and production of crude oil and natural gas offshore China. We are the dominant producer of crude oil and natural gas and the only company permitted to conduct exploration and production activities with international oil and gas companies offshore China.

Canadian Natural Resources Limited acquires, explores for, develops, produces, markets, and sells crude oil, natural gas, and natural gas liquids (NGLs). The company offers light and medium crude oil, primary heavy crude oil, Pelican Lake heavy crude oil, bitumen (thermal oil), and synthetic crude oil (SCO). The company's midstream assets include two pipeline systems; and a 50% working interest in an 84-megawatt cogeneration plant at Primrose. It operates primarily in Western Canada; the United Kingdom portion of the North Sea; and Offshore Africa. The company was formerly known as AEX Minerals Corporation and changed its name to Canadian Natural Resources Limited in December 1975. Canadian Natural Resources Limited was incorporated in 1973 and is headquartered in Calgary, Canada.

Eni S.p.A. operates as an integrated energy company worldwide. It engages in exploration, development, extracting, manufacturing, and marketing crude oil and natural gas, oil-based fuels, chemical products, and gas-fired power, as well as energy products from renewable sources. The company operates through Exploration & Production; Global Gas & LNG Portfolio (GGP); Refining & Marketing and Chemicals; Plenitude & Power; and Corporate and Other Activities segments. The Exploration & Production segment engages in research, development, and production of oil, condensates, and natural gas; and forestry conservation and CO2 capture and storage projects. The GGP segment is involved in the supply and sale of wholesale natural gas through pipeline; and international transport, and purchase and marketing of liquefied natural gas. The Refining & Marketing and Chemicals segment supplies, processes, distributes, and markets fuels and chemicals. The Plenitude & Power segment engages in the retail sale of gas, electricity, and related services; production and wholesale sale of electricity from thermoelectric and renewable plants; and provision of services for E-mobility. The Corporate and Other Activities segment is involved in the research and development, new technologies, business digitalization, and environmental activities. The company was founded in 1953 and is headquartered in Rome, Italy.

EOG Resources, Inc., together with its subsidiaries, explores for, develops, produces, and markets crude oil, natural gas liquids, and natural gas primarily in producing basins in the United States, the Republic of Trinidad and Tobago and internationally. The company was formerly known as Enron Oil & Gas Company. EOG Resources, Inc. was incorporated in 1985 and is headquartered in Houston, Texas.