Paleosalinity and Its Association with Organic Matter: A Case Study from the Eocene Shahejie Formation, Laizhou Bay Sag, Bohai Bay Basin (China)

作     者：LIANG Haoran XU Guosheng YU Qing XU Fanghao WANG Deying CHEN Zhiyuan LIANG Haoran;XU Guosheng;YU Qing;XU Fanghao;WANG Deying;CHEN Zhiyuan

作者机构：State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationChengdu University of TechnologyChengdu 610059China Bohai Oilfield Research InstituteTianjin BranchCNOOC Ltd.Tianjin 300459China Shanghai BranchCNOOC Ltd.Shanghai 200335China Research Institute of Petroleum Exploration and ProductionSouthwest Petroleum BranchSINOPECChengdu 610041China 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2021年第20卷第4期

页      面：741-754页

核心收录：

学科分类：070704[理学-海洋地质] 0709[理学-地质学] 07[理学] 0707[理学-海洋科学] 

基　　金：This study was supported by grants from the National Science and Technology Major Projects(No.2016ZX05024-002-007) the CNOOC Project(No.CCL2020TJ X0NST1271) 

主　　题：paleosalinity Laizhou Bay Sag Shahejie formation brackish lake major and trace elements 

摘      要：Paleosalinity is vital for the paleoenvironmental reconstruction and affects the formation of source *** lower-middle sections of the third member of Eocene Shahejie formation(Es3M-L)constitute the most important source rock layer in Laizhou Bay ***,the paleosalinity of the depositional water in which Es3M-L submembers are deposited remains unclear.A series of integrated experiments,including major and trace elements,X-ray diffraction,total organic carbon,and Rock-Eval,was performed to reveal the paleosalinity and its relationship with organic matter(OM).Various inorganic proxies(Sr/Ba,Rb/K,B/Ga,Walker’s paleosalimeter,Adam’s paleosalimeter,and Couch’s paleosalimeter)were employed to determine the paleosalinity of *** differences existed in the ***’s paleosalimeter is the most reliable and qualitative approach for Laizhou Bay *** from the lake center(depocenter)and margin showed paleosalinities from 4.92 wt‰to 9.73 wt‰,suggesting a ubiquitous brackish(oligohaline-mesohaline)water body in the *** enrichment in samples indicates an oxygen-depleted(suboxic or anoxic)*** increase in salinity has a certain but non-significant positive correlation with oxygen *** condition may be attributed to the weak stratification of the water column in brackish water ***,paleosalinity has a weak and indirect relationship with OM accumulation during the deposition of Es3M-L submembers in Laizhou Bay Sag.