Petroleum Geology in Deepwater Settings in a Passive Continental Margin of a Marginal Sea:A Case Study from the South China Sea  

作　　者：ZHANG Gongcheng FENG Congjun YAO Xingzong JI Mo YANG Haizhang QU Hongjun ZENG Qingbo ZHAO Zhao SUN Rui 

机构地区：[1]State Key Laboratory of Continental Dynamics,Northwest University,Xi'an 710069,China [2]Department of Geology,Northwest University,Xi'an 710069,China [3]CNOOC Research Institute Co.,Ltd.,Beijing 100028,China

出　　处：《Acta Geologica Sinica(English Edition)》2021年第1期1-20,共20页地质学报（英文版）

基　　金：supported by the National Science and Technology Major Project(Grant nos.2016ZX05026,2016ZX05026–007–007);the National Natural Science Foundation of China(Grant nos.91528303,41502127);the Opening Foundation of State Key Laboratory of Continental Dynamics,Northwest University,the Natural Science Basic Research Plan in Shaanxi Province of China(Grant No.2017JM4013);the Scientific Team Foundation of Department of Geology,Northwest University,Xi’an。

摘　　要：Deepwater oil and gas exploration has become a global hotspot in recent years and the study of the deep waters of marginal seas is an important frontier research area.The South China Sea(SCS)is a typical marginal sea that includes Paleo SCS and New SCS tectonic cycles.The latter includes continental marginal rifting,intercontinental oceanic expansion and oceanic shrinking,which controlled the evolution of basins,and the generation,migration and accumulation of hydrocarbons in the deepwater basins on the continental margin of the northern SCS.In the Paleogene,the basins rifted along the margin of the continent and were filled mainly with sediments in marine-continental transitional environments.In the Neogene–Quaternary,due to thermal subsidence,neritic-abyssal facies sediments from the passive continental margin of the SCS mainly filled the basins.The source rocks include mainly Oligocene coal-bearing deltaic and marine mudstones,which were heated by multiple events with high geothermal temperature and terrestrial heat flow,resulting in the generation of gas and oil.The faults,diapirs and sandstones controlled the migration of hydrocarbons that accumulated principally in a large canyon channel,a continental deepwater fan,and a shelf-margin delta.

关 键 词：DIAPIR deepwater fan gas-rich sag hydrocarbon accumulation model Wilson cycles South China Sea 

分 类 号：P618.13[天文地球—矿床学]