The Gulf of Mexico Foundation welcomes Nexen to our family of supporters. Nexen is an upstream oil and gas company responsibly developing energy resources in the UK North Sea, offshore West Africa, the United States and Western Canada. A wholly-owned subsidiary of CNOOC Limited, Nexen has three principal businesses: conventional oil and gas, oil sands and shale gas. Nexen is one of the largest leaseholders in the Gulf of Mexico, with approximately 200 blocks of land. Nexen says “Our joint venture discoveries at Appomattox are our best yet.” Located about 72 miles off the Louisiana coast, Appomattox is estimated to contain (net to Nexen) 106 million barrels of oil equivalent of probable reserves.