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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.

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.

The Hong Kong and China Gas Company Limited, together with its subsidiaries, produces, distributes, and markets gas, water supply and energy services in Hong Kong and Mainland China. It is involved in the provision of smart energy, piped city-gas, upstream and midstream projects, water supply and wastewater treatment, urban waste resource utilization, and natural gas filling stations, as well as new energy exploration and utilization activities. The company develops new energy projects that are low in emissions and pollution, which includes clean coal chemical business, liquefaction of methane, etc., as well as supplies town gas. It also provides network connectivity, data center, and ICT services, as well as engineering, procurement, and construction services. In addition, the company offers consultancy and engineering contractor services, including utilities installation, infrastructure construction, and civil and building services engineering for public and private projects; and designs and manufactures gas meters and metering systems. Further, it is involved in water supply, and domestic sewage and industrial wastewater treatment activities. Additionally, the company manufactures polyethylene piping and fittings; as well as engages in the software development, solution implementation, and systems integration activities. The Hong Kong and China Gas Company Limited was founded in 1862 and is headquartered in North Point, Hong Kong.

Occidental Petroleum Corporation, together with its subsidiaries, engages in the acquisition, exploration, and development of oil and gas properties in the United States, the Middle East, and North Africa. It operates through three segments: Oil and Gas, Chemical, and Midstream and Marketing. The company's Oil and Gas segment explores for, develops, and produces oil and condensate, natural gas liquids (NGLs), and natural gas. Its Chemical segment manufactures and markets basic chemicals, including chlorine, caustic soda, chlorinated organics, potassium chemicals, ethylene dichloride, chlorinated isocyanurates, sodium silicates, and calcium chloride; and vinyls comprising vinyl chloride monomer, polyvinyl chloride, and ethylene. The Midstream and Marketing segment gathers, processes, transports, stores, purchases, and markets oil, condensate, NGLs, natural gas, carbon dioxide, and power. This segment also invests in entities. Occidental Petroleum Corporation was founded in 1920 and is headquartered in Houston, Texas.