Wenchang A sag is in the west of pearl river mouth basin, is the continental margin since the Cenozoic extensional basin tectonic. Movement by indosinian plate Philippine plate on the mutual influence of the Pacific plate. From the end of Eocene to the beginning of Oligocene, the faults in wenchang A sag were mainly in the east-west direction due to the influence of the third period tensile fracture. In the third Tensile fracture stage, there were shenhu formation wenchang formation and enping formation, and the tectonic activities in the post-fissure stage were mainly characterized by stable thermal subsidence and widespread regional subsidence, and the quaternary Marine sediments of the zhuhai formation and the upper tertiary zhujiang formation, hanjiang formation, yuehai formation and wanshan formation were developed. The dongsha movement is the final movement in the northern part of the South China Sea, faults have largely ceased to develop. In the south and east of the study area, there are zhusanan fault in the basin and no. 6 fault zone in the depression, while the rest are grade Ⅳ faults and micro-faults controlling local structures. Based on the interpretation of 3 D fine structure in Wenchang A sag, combined coherence, ant body, inclination curvature and other seismic attribute analysis methods, it is shown that the faults in this area are normal faults, and there are two groups of faults in NE and EW direction. The working area is mainly developed with stepped faults and y-shaped faults, and the plane features of x-conjugate faults and negative flower-shaped faults developed in the middle under tensile shear stress are parallel and column-like broom.
类型: 国际会议
作者: Zhang Hao
来源: Workshop 6 2019 2019-06-01
年度: 2019
分类: 基础科学
专业: 地质学
单位: Qingdao Institute of Marine Geology
分类号: P542
页码: 133
总页数: 1
文件大小: 98k
下载量: 1
本文来源: https://www.lunwen90.cn/article/b585bd2954c2ec13c07adf46.html