东海陆架盆地南部中生界分布浅析

以东海陆架盆南部的相关钻井资料为依据,标定经过攻关处理后的区域二维地震测线中生界的反射波组特征,通过解释后认为中生界在东海陆架盆地南部分布相当广泛,面积超过10×10~4 km~2。沉积持续时间较长,部分中生代深凹残余沉积厚度可达5 000 m以上。受中生代后期火成岩和区域构造运动作用,一些区域抬升剥蚀,一些区域仍保留了较厚的沉积。研究区南东部中生界发育较全,并且发育较厚的、生烃条件较好的中下侏罗统,是寻找油气的有利地区。

The Distribution of Mesozoic in the Southern Part of East China Sea Shelf Basin

On the basis of the well drilling data from the southern part of East China Sea shelf basin,the 2D reflection characteristics of Mesozoic have been calibrated after processing.Through interpretation it is believed that Mesozoic strata distribute widely in the southern part of East China Sea shelf basin,with area over 10×10~4 km~2,and the Mesozoic sedimentation period lasted for a very long time,and the residual thickness is over 5 000 m in part of the Mesozoic deep depression.Influenced by regional tectonic movements and the igneous rocks deposited during the late period of Mesozoic,uplifting and erosion occurred in some areas,and thick Mesozoic deposits remained in other areas.The Mesozoic are well developed in the southeast part of the study area,and the middle-lower Jurassic with great thickness are also well developed,with good geologic conditions for HC generation,being favorable area for HC exploration.