PetroChina Co Ltd is a China-based company principally engaged in the production and distribution of oil and natural gas. The Company primarily operates businesses through five segments. The Oil, Gas and New Energy segment is engaged in the exploration, development, production, transportation and marketing of crude oil and natural gas and new energy business. The Refining, Chemicals and New Materials segment is engaged in the refining of crude oil and petroleum products, the production and marketing of primary petrochemical products, derivative petrochemical products, other chemical products and new materials business. The Marketing segment is engaged in the marketing of refined products and non-oil products, and the trading business. The Natural Gas Sales segment is engaged in the transportation and sales of natural gas. The Head Office and Other segment is engaged in cash management and financing activities, the corporate center, research and development, and other business services.