China's CNOOC Ltd boosted its oil and gas production by a marginal 0.8% in the first quarter of this year to 120.1 million barrels of oil equivalent, even though domestic output dropped 1.2% to 77.5 million boe due to natural decline, writes Xu Yihe.

Of its total domestic crude production, 38.8 million barrels was from Bohai Bay, 9.5 million from the western South China Sea and 16.7