Holly Corporation, through its subsidiaries, operates as a petroleum refiner in the United States. It involves in the purchase and refining of crude oil; and wholesale and marketing of refined products, such as gasoline, diesel fuel, and jet fuel in Texas, New Mexico, Arizona, Utah, Wyoming, Montana, Idaho, Washington, and northern Mexico. The company also manufactures and markets asphalt products from various terminals in Arizona and New Mexico. In addition, it transports liquid petroleum gas ( ...

Teekay Corporation, together with its subsidiaries, provides crude oil and petroleum product transportation services worldwide. The company operates through four segments: Offshore, Fixed-Rate Tanker, Liquefied Gas, and Spot Tanker. The Offshore segment includes shuttle tanker operations; floating storage and off-take units; and floating production, storage, and offloading units. These vessels provide transportation, processing, and storage services to oil companies operating offshore oil field ...

Penn West Energy Trust operates as an open-ended, unincorporated investment trust in Canada. The trust, through its subsidiaries, engages in acquiring, developing, exploiting, and holding interests in petroleum and natural gas properties and assets. Its oil and gas properties are located in the western Canadian Sedimentary Basin and within the provinces of British Columbia, Alberta, Saskatchewan, and Manitoba. As of December 31, 2006, it had proved plus probable gross reserves of 482,560 million ...

Ashland Inc. (NYSE:ASH), a FORTUNE 500, diversified chemical company provides innovative products, services and solutions to customers around the globe. Ashland has sales and operations in the United States and in more than 100 countries worldwide. Our operations include four divisions: Ashland Performance Materials, Ashland Distribution, Valvoline and Ashland Water Technologies. We've come a long way since we started in 1924 as a regional petroleum refiner. We're a growing, dynamic company with ...

The Williams Companies, Inc., through its subsidiaries, engages in the production, gathering, processing, and transportation of natural gas. It also engages in the management of power business. The company operates through four segments: Exploration and Production, Gas Pipeline, Midstream Gas and Liquids, and Power. The Exploration and Production segment produces, develops, and manages natural gas reserves primarily in the Rocky Mountain and Mid-Continent regions of the United States. This segme ...

Sunoco, Inc., through its subsidiaries, manufactures and markets various petroleum products, including fuels, lubricants, and petrochemicals in the United States. It also manufactures chemicals and has interests in logistics and cokemaking. The company operates in five segments: Refining and Supply, Retail Marketing, Chemicals, Logistics, and Coke. The Refining and Supply segment manufactures petroleum products, including gasoline; and middle distillates, such as jet fuel, heating oil, and diese ...

CNOOC Limited, together with its subsidiaries, engages in the exploration, development, production, and sale crude oil, natural gas, and petroleum products in China. The company has four oil production areas offshore China, which include Bohai Bay, western south China Sea, eastern south China Sea, and east China Sea, as well as offshore oil facilities in Indonesia and certain upstream assets in regions, such as Africa and Australia. As of 31 December 2006, CNOOC had net proved reserves of approx ...

Schlumberger Limited operates as an oilfield services company in the United States and internationally. The company operates in two segments, Oilfield Services and WesternGeco. The Oilfield Services segment provides technology, project management, and information solutions to the petroleum industry. Its technologies primarily include open-hole and cased-hole services; drilling and measurements; well testing and well services; completion services, including intelligent well completions; productio ...

BHP Billiton Limited, together with its subsidiaries, engages in mining, drilling, and processing mineral resources. It operates through seven segments: Petroleum, Aluminium, Base Metals, Carbon Steel Materials, Diamonds and Specialty Products, Energy Coal, and Stainless Steel Materials. The Petroleum segment engages in the exploration for and production, processing, and marketing of hydrocarbons, including oil, gas, and liquefied natural gas. The Aluminium segment explores and mines bauxite, as ...