摘要
南海北部为我国重要的含油气区之一,但目前南海北部盆地的演化史及其与周边构造事件的关系仍不明确。基于钻孔和地震资料,通过数学模拟,反演了琼东南盆地和珠江口盆地的构造应力演化特征和初始地壳厚度。结果表明,南海北部盆地具有较薄的初始地壳厚度和岩石圈厚度。珠江口盆地存在两期应力松弛期,而琼东南盆地在深水区和浅水区分别存在一期应力松弛期。南海北部第一期应力松弛在空间上具有连续性,主要分布在深水区,在时间上东早西晚;第二期应力松弛空间上存在东西分异性。分析认为,南海北部深水区应力松弛期由东至西的演化应为西北次海盆由东至西的剪刀式张裂所致。珠江口盆地第二期构造应力松弛与局部岩浆侵入有关,琼东南盆地浅水区的构造应力松弛期与红河走滑断裂平静期相对应。
The northern part of the South China Sea(SCS)is one of the important oil and gas bearing areas in China.However,the evolution history of the basins located in the northern SCS and their relationship with the surrounding tectonic events are still unclear.Based on the drilling and seismic data,the tectonic stress evolution characteristics and the initial crustal thickness of the Qiongdongnan Basin and Pearl River Mouth Basin are calculated by using mathematical simulation.The results show that the basins of the northern SCS have thinner initial crust thickness and lithospheric thickness.There exist two stress relaxation periods in the Pearl River Mouth Basin,and two stress relaxation periods in the Qiongdongnan Basin,one in shallow water and the other in deep water.The first period of stress relaxation in the northern SCS was continuous in space,which is mainly distributed in the deep water area,and was earlier in the east and later in the west.The second period was different in the east and west.The analysis shows that the stress relaxation periods in the deep water of the northern SCS were related with shear rifting from east to west of the northwest sub-basin of the SCS.The second period of stress relaxation in the Pearl River Mouth Basin was related to local magmatic intrusion,and the stress relaxation period in the shallow water of the Qiongdongnan Basin corresponded to the quiet period of the Red River fault.
作者
刘见宝
孙珍
王振峰
黄安敏
曾小宇
LIU Jianbao;SUN Zhen;WANG Zhenfeng;HUANG Anmin;ZENG Xiaoyu(Henan Polytechnic University,Jiaozuo 454000,China;School of Resource and Environment,Henan Institute of Engineering,Zhengzhou 451191,China;CAS Key Laboratory of Marginal Sea and Ocean Geology,South China Sea Institute of Oceanology,Guangzhou 510301,China;Zhanjiang Technical Department,China National Offshore Oil Corporation,Zhanjiang 524057,China)
出处
《热带海洋学报》
CAS
CSCD
北大核心
2018年第2期63-71,共9页
Journal of Tropical Oceanography
基金
国家自然科学基金(41206037)
河南工程学院博士基金项目(D2015010)
关键词
南海北部
新生代
构造应力反演
初始地壳厚度
northern South China Sea
Cenozoic
structural stress inversion
initial crustal thickness
作者简介
刘见宝(1982—),男,河南省开封市人,讲师,博士后,现从事构造地质的研究、教学工作。Email:514348839@qq.com;通信作者:孙珍(1971—),女,研究员,博士生导师,主要从事构造分析与模拟研究。E-mail:zhensun@scsio.ac.cn
