摘要
珠江口盆地位于南海北部大陆边缘,横跨了华南大陆架、大陆坡以及洋陆过渡带地区,其构造演化十分复杂。随着勘探程度的加深,珠江口盆地的边界也一直发生着变化,盆地南部边界存在争议。本文基于卫星重力异常数据和磁力异常数据,重新研究了珠江口盆地的断裂及火成岩分布,并以高精度地震数据为约束反演了研究区新生界深度,根据处理的结果对研究区构造单元进行了调整。研究结果显示,研究区的NEE、NE和NW向断裂较为发育,且在本次研究中新识别出4条断裂;火成岩平面位置整体走向为NEE向,但不同区域走向存在区别:在盆地西部有近EW向火成岩,盆地中部火成岩为NWW向,而盆地东部火成岩部分为近EW向;在构造单元中将阳江凹陷根据重力和新生界特征分成了阳江西凹陷和阳江东凹陷,并删去了文昌D凹陷和文昌E凹陷。NW向的北卫滩断裂与阳江-一统断裂一起将盆地分为西部、中部和东部3个部分,此3个部分的断裂走向、火成岩平面位置和新生界厚度及构造单元都有所不同。本次同时对珠江口盆地断裂、火成岩和构造单元进行研究,旨在对后续盆地研究和油气突破提供地球物理支撑。
The Zhujiang River Mouth Basin is located in the northern shelf of the South China Sea,and its tectonic evolution is very complicated.At the same time,as one of the hydrocarbon-rich basins in offshore China,Zhujiang River Mouth Basin ranks the top in oil and gas production among the offshore basins.With the deepening of exploration,the boundary of the Zhujiang River Mouth Basin has been changing,and the southern boundary of the basin is disputed.In this paper,based on satellite gravity and magnetic anomaly data,the fault distribution of Zhujiang River Mouth Basin is re-studied and the plane location of igneous rocks is identified.The Cenozoic thickness of the study area is retrieved with high-precision seismic data,and the tectonic units of the study area are adjusted according to the processing results.The results show that the fault distribution in the study area is mainly NEE,NE and NW trending.In this study,four new faults were identified based on the satellite gravity data.The overall strike of the igneous rocks in the plane is NEE strike,but there are differences among different regional strikes.There are nearly EW trending igneous rocks in the western basin,NWW trending igneous rocks in the central basin,and no other strike in the eastern basin.According to gravity data and Cenozoic characteristics,Yangjiang Sag is divided into Yangjiang West Sag and Yangjiang East Sag,and Wenchang D Sag and Wenchang E Sag are deleted.The Beiweitan Fault is the same as the Yangjiang-Yitong Fault,which divides the basin into three parts:the west,the middle and the east.The fault strike,the plane position of igneous rock,the thickness of Cenozoic and the tectonic units of the three parts are different.The study of faults,igneous rocks and tectonic units in Zhujiang River Mouth Basin aims to provide geophysical support for subsequent basin research and oil and gas breakthrough.
作者
何泽洋
白志钊
王万银
李林致
张义蜜
陈莹
何涛
马瑞云
He Zeyang;Bai Zhizhao;Wang Wanyin;Li Linzhi;Zhang Yimi;Chen Ying;He Tao;Ma Ruiyun(School of Geology Engineering and Geomatics,Chang’an University,Xi’an 710054,China;CNOOC Research Institude Co.,Ltd.,Beijing 100028,China;National Engineering Research Center of Offshore Oil and Gas Exploration,Beijing 100028,China;Key Laboratory of Marine Geology and Environment,Chinese Academy of Science,Qingdao 266071,China;Department of Earth Sciences,Memorial University of Newfoundland,St.Johns AlB3X5,Canada)
出处
《海洋学报》
CAS
CSCD
北大核心
2023年第12期25-43,共19页
基金
中海油研究总院有限责任公司科技项目(CCL2021RCPS1067KQN)。
关键词
重磁资料
断裂
火成岩
新生界
gravity and magnetic data
faults
igneous rocks
Cenozoic surface
