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Paleosalinity and Its Association with Organic Matter: A Case Study from the Eocene Shahejie Formation, laizhou bay sag, Bohai bay Basin (China)

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Journal of Ocean University of China 2021年第4期20卷 741-754页

作者： LIANG Haoran XU Guosheng YU Qing XU Fanghao WANG Deying CHEN Zhiyuan State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China Bohai Oilfield Research Institute Tianjin BranchCNOOC Ltd.Tianjin 300459China Shanghai Branch CNOOC Ltd.Shanghai 200335China Research Institute of Petroleum Exploration and Production Southwest Petroleum BranchSINOPECChengdu 610041China

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.

关键词： paleosalinity laizhou bay sag Shahejie formation brackish lake major and trace elements

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