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福山凹陷位于海南岛北部沿海地区,凹陷北半部位于琼州海域水中,南半部为海南岛北部陆地,陆地面积2100km~2,占凹陷70.8％。 1963—1965年根据重力和地面电法资料确定福山凹陷的存在和基本构造轮廓,并选临高鼻状隆起及福山重力高,打过5口浅井,发现上第三系海相地层和下第三系围洲组及白垩系。1975—1978年在福山凹陷钻井38口,有24口井见油气显示,获油流井4口,产油层下第三系涠洲组和流沙港组砂岩。
Fukuyama Sag is located in the northern coastal area of Hainan Island. The northern half of the depression is located in the water of Qiongzhou Sea. The southern half is the northern land of Hainan Island. Its land area is 2100km ~ 2, accounting for 70.8% of the depression. From 1963 to 1965, the existence and basic tectonic contour of the Fukuya Depression were determined according to gravity and terrestrial electrical data and selected high sagittal uplift and high Fukuyama gravity. After drilling five shallow wells, it was found that the Upper Tertiary marine strata and the third Department of Wai Chau and Cretaceous. From 1975 to 1978, 38 wells were drilled in the Fukuya Depression, showing oil and gas in 24 wells, 4 oil wells, and the Lower Cretaceous Weizhou Formation and the Liushaogang Formation sandstone.