Nexen Energy ULC (Nexen) is an upstream oil and gas company. The Company is engaged in petroleum exploration, development and production in Canada. Nexen is engaged in developing energy resources in the United Kingdom North Sea, offshore West Africa, the United States and Western Canada. Nexen has three principal businesses: conventional oil and gas, oil sands, and shale gas/oil. The Company sells its crude oil and synthetic oil to international markets. The Company holds approximately 70 blocks in the United Kingdom North Sea. It has an interest in more than 300,000 acres in the Athabasca region. Kinosis 1A (K1A) is its steam assisted gravity drainage (SAGD) development, located approximately 12.5 kilometers south of the Long Lake facility. The Company produces shale gas from its Dilly Creek facility. The Company is a wholly owned subsidiary of CNOOC Limited.