CNOOC Ltd., the listed arm of China National Offshore Corporation （CNOOC）, the largest offshore oil and gas producer in China, produced a total of 80.9 million barrels of oil equivalent in the third quarter in 2011, down 9.1 percent from the same period last year as it shut the country＇s largest offshore oil field after an oil spill off China＇s northern coast. However, the company posted a 23.7 percent gain in third-quarter revenue from a year earlier as it benefited from rising oil and gas prices,
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