Nexen Energy ULC (Nexen) is an upstream oil and gas company. The Company is engaged in developing energy resources in the United Kingdom North Sea, offshore West Africa, the United States and Western Canada. The Company’s core business includes conventional oil and gas, oil sands and shale gas / oil. Nexen holds approximately 70 blocks in the United Kingdom North Sea. Nexen holds a 20% non-operated working interest in Appomattox, a discovery located about 72 miles off the coast of Louisiana in approximately 7,000 feet of water. Operated by Shell Gulf of Mexico Inc., Appomattox is estimated to contain about 700 million barrel of oil equivalent of probable reserves. Nexen also has a 25% non-operated working interest in the Stampede field, which is operated by Hess Corporation. Stampede is located about 170 miles southeast of New Orleans, Louisiana.