PetroChina (中国石油天然气股份有限公司) is a company that provides petroleum-related products, services, and activities. It operates in five segments: Oil, Gas, and New Energy; Refining, Chemicals, and New Materials; Marketing; Natural Gas Sales; and Head Office and Other. The Oil, Gas, and New Energy segment specializes in the exploration, development, transportation, production, and marketing of crude oil and natural gas and new energy resources. The Refining, Chemicals, and New Materials segment focuses on the refining of crude oil and petroleum products, the production and marketing of petrochemical products, etc. The Marketing segment provides marketing of refined and non-oil products, and the Natural Gas Sales segment is engaged in the transportation and sale of natural gas. The Head Office and Other segment focuses on cash management and financing activities, research and development, and other business services.