日本国内最大的海上油田——岩船湾油田1990年12月开始投产。它是继阿贺湾油气田、阿贺北油田之后开发的第3个海上油田。由日本海洋石油资源开发、石油资源开发、新石油开发、三菱瓦斯化学四家公司共同开发。1990年9月打出1号生产井并于同年12月开始生产,目前正钻2号生产井,计划到1992年3月打出10口生产井。预计到1992年产量达到:原油6919 bbl/d(34.6×10~4t/a),天然气30×10~4m~3/d。可开 Yan Shuewan, the largest offshore oil field in Japan, started production in December 1990. It is the third offshore oilfield developed after the Ahewan oil and gas field and the Afganbei oilfield. Developed by Japan’s offshore oil resources development, oil resources development, new oil development, Mitsubishi Gas Chemical four companies. Production well No. 1 was launched in September 1990 and production started in December of the same year. Production well No. 2 is now being drilled and 10 production wells are planned to hit March 1992. It is estimated that by 1992, the output will reach 6919 bbl / d (34.6 × 10 ~ 4t / a) of crude oil and 30 × 10 ~ 4m ~ 3 / d of natural gas. Can be opened