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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.

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.

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.

Petróleo Brasileiro S.A. - Petrobras operates in the oil, natural gas, and energy industries in Brazil and internationally. It engages in prospecting, drilling, refining, processing, trading, and transporting crude oil from producing onshore and offshore oil fields and shale or other rocks, as well as oil products, natural gas, and other liquid hydrocarbons. The company's Exploration and Production segment engages in the exploration, development, and production of crude oil, natural gas liquids, and natural gas primarily for supplies to the its domestic refineries. Its Refining, Transportation and Marketing segment is involved in the refining, logistics, transport, and trading of crude oil and oil products; exportation of ethanol; and extraction and processing of shale, as well as holding interests in petrochemical companies. The company's Gas and Power segment engages in the logistic and trading of natural gas and liquid natural gas; generation of electricity through thermoelectric power plants; holding interests in transportation and distribution of natural gas; and fertilizer business operations. Its Biofuels segment is involved in the production of biodiesel and its co-products, as well as production and trading of ethanol, sugar, and electric power generated from sugarcane bagasse. The company's Distribution segment sells oil products, including gasoline and diesel; ethanol; and vehicle natural gas, as well as distributes oil products in South America. Petróleo Brasileiro S.A. - Petrobras was founded in 1953 and is headquartered in Rio de Janeiro, Brazil.