Apache is one of the world’s largest independent oil and gas development companies, with exploration and production interests in the United States, Canada, Egypt, Australia, the United Kingdom North Sea, China and Argentina, as well as exploration interests in Poland. The company’s North American exploration and production operations are focused in the Gulf of Mexico, the Gulf Coast, the Permian Basin, the Anadarko Basin and the Western Sedimentary Basin of Canada. At the end of 2002, Apache had total estimated proved reserves of 637m barrels of crude oil, condensate and natural gas liquids and 4.1trn cubic feet of natural gas.