东海西湖凹陷新生代盆地原型分析

Prototype Basin Analysis in Cenozoic for Xihu Sag, East China Sea

何将启 杨风丽

HE Jiang-qi YANG Feng-li

中国石化 石油勘探开发研究院 无锡实验地质研究所, 江苏 无锡 214151; 同济大学 海洋与地球科学学院, 上海 200092

School of Ocean and Earth Science, Tongji University, Shanghai 200092, China; Wu xi Research Institute of Experimental Petroleum Geology, SINOPEC, Wuxi 214251, China

通过对西湖凹陷的地质、地球物理资料的综合分析,提出西湖凹陷新生界经历四种原型迭加演化过程,即:古新统-中下始新统陆内拉张断陷;中上始新统(平湖组)转换边缘拗陷;渐新统-中新统(花港组及龙井组、玉泉组、柳浪组)的陆内迁移拗陷和上新统-第四系弧后扩张盆地的陆架边缘组成。西湖凹陷的这种不同原型迭加的结构与其所处的大地构造背景有关,因此也初步分析了西湖凹陷新生代结构形成的动力学背景。

The geological and geophysical analysis has shown that Xihu sag, East China Sea passed through four prototype basin superimposed and reformed phases in Cenozoic, which are intracontinental tensional fault depression phases from Paleocene to early and middle Eocene, transform continental margin depression phases in middle and late Eocene, intracontinental transported depression phases from Oligocene to Miocene, and shelf margin of back-arc tensional basin phases from Pliocene to Quaternary. The superimposed structure of different prototype basins is related to the tectonic setting and the dynamic setting.

https://doi.org/10.3969/j.issn.1008-2336.2003.z1.004