Nexen runs oil sands and shale gas projects in western Canada and conducts conventional exploration, primarily in the British North Sea, offshore West Africa and the Gulf of Mexico.
China and Canada are highly complementary to each other in terms of industrial structure and resource reserves and the two countries' cooperation in investment will benefit both economies, the MOC official said.
China hopes Canada will continue to maintain an open stance toward foreign investment, the official said.
CNOOC has said acquiring Nexen's assets will strengthen its presence in Canada, Nigeria and the Gulf of Mexico and allow it to enter the oil- and gas-rich North Sea regions.
The deal will also bring long-term economic benefits for Calgary and for Canada, CNOOC said in a Saturday statement.
As China's largest offshore oil producer, CNOOC operates mainly in seas off China, but also has assets in Asia, Africa, North America, South America and Oceania, according to information on the company's website.
Cumquat market in S China's Guangxi