Cenozoic Sea-land Transition and its Petroleum Geological Significance in the Northern South China Sea  

作　　者：ZHAO Zhigang ZHANG Hao CUI Yuchi TANG Wu QIAO Peijun 

机构地区：[1]CNOOC Research Institute Co.,Ltd.,Beijing 100028,China [2]State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China

出　　处：《Acta Geologica Sinica(English Edition)》2021年第1期41-54,共14页地质学报（英文版）

基　　金：granted by the National Natural Science Foundation of China(Grant No.42076066,92055203 and 41874076);the National Science and Technology Major Project(Grant No.2016ZX05026–004);the National Key Research and Development Program of China(Grant No.2018YFE0202400)。

摘　　要：The process of Cenozoic sea-land changes in the northern South China Sea(SCS)controlled the sedimentary filling pattern and played an important role in the petroleum geological characteristics of the northern marginal sedimentary basins.Under the control of the opening process of the SCS,the northern SCS Cenozoic transgression generally showed the characteristics of early in the east and late in the west,and early in the south and late in the north.The initial transgression occurred in the Eocene in the Taixinan Basin(TXNB)of the eastern SCS,while the transgression occurred until the Pliocene in the Yinggehai Basin(YGHB)of the western SCS.International Ocean Discovery Program(IODP)expeditions(Expeditions 367/368)revealed that the initial transgression of the SCS basin occurred at approximately 34 Ma,which was the initial opening time of the SCS.The period of drastic changes in the sedimentary environment caused by large-scale transgression corresponded to the opening time of the southwestern subbasin(approximately 23 Ma),which also represented the peak of the spreading of the SCS.The sea-land transition process controls the distribution of alternating continent-marine facies,marine facies source rocks and reservoirs in the basins.The marine facies source rocks of the basins in the northern SCS have a trend of gradually becoming younger from east to west,which is consistent with the regional process of gradual transgression from east to west.Regional sea-level changes were comprehensively influenced by SCS opening and global sea-level changes.These processes led to the early development in the east and south and late development in the west and north for the carbonate platform in the SCS.Carbonate platforms form another type of"selfgenerating and self-accumulating"oil-gas reservoir in the northern SCS.The sea-land transition controlled the depositional filling patterns of different basins and laid the foundation of marine deposits for oil and gas resources.The source-reservoircap assemblage in the northern SCS was

关 键 词：marine stratum sea-level changes sea-land transition oil and gas resources northern South China Sea 

分 类 号：P618.13[天文地球—矿床学]