Geochemistry and heterogeneous accumulation of organic matter in lacustrine basins:A case study of the Eocene Liushagang Formation in the Fushan Depression,South China Sea

作     者：Bang Zeng Mei-Jun Li Ning Wang Yang Shi Fang-Zheng Wang Xin Wang Bang Zeng;Mei-Jun Li;Ning Wang;Yang Shi;Fang-Zheng Wang;Xin Wang

作者机构：State Key Laboratory of Petroleum Resources and ProspectingCollege of GeosciencesChina University of Petroleum(Beijing)Beijing102249China Key Laboratory of Exploration Technologies for Oil and Gas ResourcesMinistry of EducationCollege of Resources and EnvironmentYangtze UniversityWuhanHubei430100China Southern Oil Exploration and Development CompanyPetro ChinaHaikouHainan570216China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2022年第19卷第6期

页      面：2533-2548页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：funded by the Hainan Fushan Oilfield Exploration and Development Company (2020-HNYJ-003) 

主　　题：Organic matter Geochemical characteristics Heterogeneous accumulation Areal distribution Lacustrine basin 

摘      要：Determining the spatial distributions of organic-rich mudstones in hydrocarbon-bearing lacustrine basins is crucial for targeting exploration wells and discovering commercially viable petroleum ***,the strong heterogeneity of sedimentary systems and organic matter(OM)input and accumulations make it difficult to identify OM-rich mudstones in lacustrine *** paper takes the Eocene Liushagang Formation,in the Fushan Depression,South China Sea,as an example to clarify the relationship between the geochemical characteristics of OM and sedimentary facies.A practical approach is proposed for predicting the spatial distribution of good-quality source rocks with high OM *** method used is a combination of logging-based surface fitting and the mudstone to stratum thickness ratio(M/S ratio)of different depositional *** was found that this approach improved TOC content prediction both vertically and *** results suggest that semi-deep lacustrine mudstones with predominantly aquatic organism input,deposited in suboxic-anoxic saline stratified water,contain more preserved OM than other *** this method,limited areas on the southern slope of the lower Liushagang sequence(SQls3),the central part of the Huangtong Sag in the middle Liushagang sequence(SQls2),and the northern part of the Huangtong Sag in the upper Liushagang sequence(SQls1)are determined to be the best-quality source rocks in the development area.