Impact of Tethyan domain evolution on the formation of petroleum systems in the Sichuan super basin,SW China  

作　　者：SHI Shuyuan YANG Wei ZHOU Gang JIANG Hua MENG Hao WU Saijun ZHANG Yan LU Weihua BAI Zhuangzhuang 

机构地区：[1]Research Institution of Petroleum Exploration&Development,Petrochina,Beijing 100083,China [2]Research Institute of Exploration and Development,PetroChina Southwest Oil&Gas Field Company,Chengdu 610041,China

出　　处：《Petroleum Exploration and Development》2024年第5期1183-1201,共19页石油勘探与开发（英文版）

基　　金：Supported by the National Natural Science of China(U22B6002);National Natural Science Foundation of China(U2344209);Major Science and Technology Project of PetroChina(2023ZZ02)。

摘　　要：Based on the“unidirectional break-up and convergence”geodynamic model,this study investigates the impact of the evolution of the Tethyan domain on the formation of petroleum systems in the Sichuan super basin and explores the enrichment pattern of natural gas.The results show that,firstly,the Sichuan Basin and its surrounding areas have experienced two unidirectional rifting-aggregation cycles triggered by the Proto-Tethys Ocean and the Paleo-Tethys Ocean during the Neoproterozoic to Triassic.During Jurassic–Cenozoic,the Sichuan Basin is incorporated in the circum-Tibetan plateau basin-mountain coupled tectonic domain system.The episodic tectonic movements within the plate control the sedimentary infill styles.Second,the evolution of the Tethyan domain,paleoclimatic environment and major geological events controlled the formation and distribution of high-quality source rocks within the basin.The rift valley and intracratonic rift,passive continental margin slope,and intracratonic sags are favorable areas for the development of source rocks.Third,the evolution of the Tethyan domain,supercontinent cycles,global sea level changes,and tectono-climatic events controlled the distribution of carbonate platform and reservoir-caprock combinations.The cratonic platform margins and sub-platform internal high terrains are key areas for finding carbonate high-energy facies belts.Syndepositional paleo-uplifts and surrounding slopes,regional unconformities,and later faults zone are areas where large-scale carbonate reservoirs are distributed.The regional evaporite or shale caprock are beneficial for the large-scale preservation of oil and gas in the basin.Fourth,the spatio-temporal matching relationship of reservoir forming factors influenced by the early tectonic-sedimentary evolution pattern and the degree of later tectonic modification is the key to oil and gas enrichment.Future oil and gas exploration should focus on potential gas systems during the Sinian rift period,Cambrian pre-salt gas systems in the eastern and s

关 键 词：Tethyan domain tectono-sedimentary evolution unidirectional continental break-up and convergence Sichuan Basin super basin geological events hydrocarbon accumulation 

分 类 号：P618.13[天文地球—矿床学] TE34[天文地球—地质学]