东海盆地前第三系与古潜山油气藏

A DISCUSSION ON THE PRE-TERTIARY SYSTEM AND ANCIENT BURIED HILL OIL POOL IN EAST CHINA SEA BASIN

东海盆地周边地质表明存在有中生代、古生代地层,并有过海相沉积环境。东海盆地内地球物理及钻井资料揭示前第三系为中生代、古生代地层及火山岩。盆内岩样与露头区岩样同位素测定不超过200Ma,可推断琉球群岛、日本九州、台湾岛、东海及中国东南沿海大陆在中—古生代是统一整体。研究认为在东海火成岩基底下可能有古生界;潜山的形成及成油气条件,指出盆地潜山具有良好的油气远景;除第三系找油气领域外,潜山也是一个重要的领域。

The geology of the surrounding areas of east China sea basin indicates that marine environment:existed during middle-late Mesozoic era and late Palaecz- oic era.The geophysical characteristics and results of exploratory drilling reveal that in the basin,Precenozoic Erathem are overlain on Mesozoic era- them.Geologic ages of drilling sample in the basin and those of outcrops of surrounding areas as determined by isotope study is less than 200Ma.These show that basement of the basin is marine formation during middle-late Mesozoic era and late Palaeozoic era,Thus,Kyushu of Japan,Rynkyu Gunto, Taiwan island,east China sea basin and land of China were united as a whole body during that period.The oil and gas potential of the Tertiary system is good,but the oil and gas potential of ancient buried (?)ills is good also,and should be taken as a new important realm in further petroleum exploration.