Factors Controlling Organic Matter Enrichment in Alkaline Lacustrine Source Rocks:A Case Study of the Late Paleozoic Fengcheng Formation in the Junggar Basin,NW China

作     者：HUANG Renda JIANG Fujie HU Tao CHEN Di HUANG Liliang LIU Zheyu WANG Xiaohao ZHANG Chenxi LU Jiahao WU Yuping HUANG Renda;JIANG Fujie;HU Tao;CHEN Di;HUANG Liliang;LIU Zheyu;WANG Xiaohao;ZHANG Chenxi;Lü Jiahao;WU Yuping

作者机构：State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum(Beijing)Beijing 102249China College of GeosciencesChina University of Petroleum(Beijing)Beijing 102249China Research Institute of Petroleum Exploration and DevelopmentXinjiang Oilfield CompanyCNPCKaramayXinjiang 834000China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2023年第97卷第6期

页      面：1744-1755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 by the National Natural Science Foundation of China(Grant Nos.41872128,42202133) the Strategic Cooperation Technology Projects of the CNPC and CUPB(Grant No.ZLZX2020-01-05) 

主　　题：organic matter enrichment control factors alkaline lake source rocks Fengcheng Formation Junggar Basin 

摘      要：The late Paleozoic Fengcheng Formation shale(LPF shale)in the Junggar Basin,NW China,is the oldest alkaline source rock discovered in the world,providing a unique perspective with which to explore organic matter(OM)enrichment in alkaline lake *** with the organic carbon isotope profile and paleoenvironmental proxies,this study reveals that the LPF shale was deposited in an arid climate with high salinity and a strong reducing environment,accompanied by frequent volcanic *** TOC values are concentrated in two intervals with frequent fluctuations in OM types.A negative excursion due to changes in sedimentary OM source is found in the δ^(13)C_(org) *** excursion corresponds to the OM enrichment interval and is accompanied by abnormally high values of Sr/Ba and Sr/*** implies that the extreme arid climate has led to high salinity,resulting in strong reducibility and changes in paleontological assemblages,which in turn controlled the differential enrichment of *** Fengcheng ***-quality source rocks are the result of the combined action of climatic events,volcanism,high-salinity water environment and superior hydrocarbon-generating *** results provide new insights into the formation conditions of terrestrial alkaline high-quality source rocks and the factors controlling alkaline OM enrichment.