Anadarko Petroleum Corporation, based in The Woodlands, Texas, was a hydrocarbon exploration company headquartered in two skyscrapers—Allison Tower and Hackett Tower—named after former CEOs. Established in Delaware, it was later acquired by Occidental Petroleum in 2019. The company faced various environmental cases, including a significant environmental contamination settlement in 2014 related to the Tronox subsidiary of Kerr McGee, a company acquired by Anadarko in 2006. Aside from exploration and production, Anadarko engaged in petroleum and natural gas gathering, processing, treatment, and transportation. The company also delved into the hard minerals business through ownership of non-operated joint ventures and royalty arrangements. As of December 31, 2018, Anadarko possessed about 1.473 billion barrels of oil equivalent (9.01×109 GJ) of proven reserves, with 45% being oil reserves, 37% natural gas, and 18% natural gas liquids. In 2018, the company produced 666 thousand barrels of oil equivalent (4,070,000 GJ) per day. In 2018, the company's operations in the United States constituted 86% of total sales volumes and 88% of total proved reserves. Anadarko held significant acreage in the Delaware Basin (over 580,000 gross acres), primarily in the Cline Shale, the Denver Basin (more than 400,000 net acres), operating 4,600 vertical wells and 1,400 horizontal wells, and Greater Natural Buttes, Utah, with approximately 2,850 wells. Internationally, Anadarko's operations represented 14% of total sales volumes in 2018 and 12% of total proved reserves at year-end 2018. The company had holdings in Algeria, Ghana, Mozambique, Colombia, and Côte d’Ivoire. According to the 2019 Forbes Global 2000, Anadarko Petroleum was ranked as the 587th largest public company worldwide.

Anadarko Petroleum - Wikipedia