Constraints of palaeoenvironment on organic matter of Benxi Formation shale and discussion on enrichment mechanism under different facies
作者机构：College of Geology and EnvironmentXi’an University of Science and TechnologyXi’an 710054China Shaanxi Provincial Key Laboratory of Geological Support for Coal Green ExploitationXi’an University of Science and TechnologyXi’an 710054China Geological Research Institute for Coal Green MiningXi’an University of Science and TechnologyXi’an 710054China Research Institute of Exploration and DevelopmentPetroChina Changqing Oilfield CompanyXi’an 710018China School of Civil Engineering and ArchitectureShaanxi University of TechnologyHanzhong 723001China
出 版 物：《Frontiers of Earth Science》 (地球科学前沿（英文版）)
年 卷 期：2024年第18卷第1期
页 面：148-171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：supported from the Natural Science Basic Research Program of Shaanxi Province(No.2020JQ-744) China Postdoctoral Science Foundation(No.2020M673443) Shaanxi Provincial Education Department general special project(No.21JK0775) Opening Project of Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural Resources(No.KF2021-7) National Natural Science Foundation of China(Grant No.4210021463)
主 题：Benxi Formation shale palaeoenvironment organic matter enrichment facies
摘 要：As a hydrocarbon-rich sedimentary basin in China,the Ordos Basin has enormous potential for shale gas *** shale of the Upper Carboniferous Benxi Formation is rich in organic matter,however,its palaeoenvironment and organic matter enrichment mode are yet to be *** this study,the geochemical characteristics of the shale of the Benxi Formation in the east-central part of the Ordos Basin were analyzed to investigate its *** the same time,the organic matter enrichment modes in different sedimentary facies were compared and *** results indicate that:1)the shale of the Benxi Formation was mainly deposited on the continental margin and strong terrestrial clastic input;2)the deposition period of the Benxi Formation shale had a hot and humid climate with high palaeoproductivity and local volcanic hydrothermal fluid,and a high sedimentation rate with the strong stagnant *** bottom water was in dysoxic conditions and a semi-saline deposition environment;3)multiple factors,such as palaeoproductivity,volcanic hydrothermal,redox conditions,and palaeosalinity interact to influence the enrichment of shale organic matter in Benxi Formation;4)the organic matter enrichment modes of continental,marine-continental transitional,and marine shales can be classified into three types:“production mode,“hybrid mode of preservation and production,and“preservation mode,*** study provides a reference for the organic matter enrichment mode,shale gas formation conditions,and core area evaluation in these marine-continental transitional shales,and also offers new guidance for exploration ideas for shale gas in different sedimentary facies.
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