东海新生代构造格架特征与油气关系

东海海域存在着二个不同时期、不同类型、不同结构秒同成因机制的新生代盆地，即发育在陆壳之上的东海陆架陆缘裂谷盆地和发育在过渡地壳之上的冲绳海槽弧后盆地。前者是大陆向洋蠕散时两次裂离而形成的，后者是洋壳向陆壳俯冲导致陆壳裂离而产生的。

RELATION OF CENOZOIC GEOLOGIC FRAMEWORK TO OIL AND GAS EXPLORATION IN EAST CHINA SEA

There are two types of Cenozoic basins in the East China Sea ,represented by theEast China Sea Continental Margin Rift Basin(MRB)on continental crust and the Oki-nawa Trough Back-arc Basin(BB)on transition crust.They are also of different geolog-ic periods,different geologic framework,and different genetic patterns. The MRB wascreated when continental blocks drove towards ocean ,which formed two episodes of riftopening. It is a complex basin made up of both Paleogene and Neogene. The BB was cre-ated by rifting of continental crust when oceanic crust was subducting towards the conti-nental crust,and is a single Neogene basin. According to the experiences of petroleum explorations in the Tertiary basins ineastern China continent,the East China Sea Cenozoic basins are inferred to have at least6 billion T oil reserves. However,the present proven reserves are only about 1 hundredmillion tons,about 1/60 of the inferred ones. Therefore,much work should be done inthe petroleum explorations.