China's largest offshore oilfield, the Bohai Oilfield, has produced over 40 million tonnes of oil equivalent in 2025, setting a historical record, the China National Offshore Oil Corporation (CNOOC) announced Sunday.As the country's leading offshore oilfield in terms of both output and scale, the record production will provide solid support for national energy security and high-quality economic and social development, according to CNOOC.The Bohai Oilfield, which currently operates more than 60 producing oil and gas fields, has yielded a cumulative crude oil output exceeding 600 million tonnes. Over the past five years, its oil and gas production has grown by...