东海陆架盆地地震地层学研究

APPLICATION OF SEISMIC STRATIGRAPHY TO THE CONTINENTAL SHELF BASIN OF CHINA'S EAST SEA

地矿部第一海洋地质调查大队

在东海陆架区应用地震地层学方法进行了地震层序划分及地震相与沉积环境的解释。东海陆架盆地北部浙东坳陷第三系沉积主要是陆相环境,始新世时期四湖凹陷西部扇三角洲发育,从始新世到中新世早期受到几次海浸影响;盆地南部台北坳陷第三系沉积主要是海相环境,下第三纪时三角洲、生物礁、滨岸砂体都比较发育。西湖凹陷西部与瓯江凹陷是盆地中最有利的油气勘探区。

In the continental shelf area of China's East Sea, the division of seismic sequence and the interpretation of seismic phase and sedimentary environment have been performed using seismic stratigraphy. The Tertiary deposition of Zhedong depression of the continental shelf basin in north of the East Sea continental shelf basin is characterized by the continental environment. During the Eocene epoch, the fan-delta in the west Xihu downwarp was well developed. From the Eocene to early Miocene epoch, it had been effected by transgression. The Tertiary deposition of Taibei depression in the south of the basin is chcracterlzed by the marine environment. During the Eocene period, the delta, bioherm and shore sandbody were quite developed. It is believed that the west of Xihu downwarp and Oujiang downwarp are the areas of best exploration prospect for finding oil/gas.