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Paleoenvironmental reconstruction and organic matter accumulation of the paleogene shahejie oil shale in the zhanhua sag, Bohai Bay Basin, Eastern China

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Petroleum Science 2024年第3期21卷 1552-1568页

作者： Xiao-Lin Wang Xiao-Min Zhu Jin Lai Xing-Yue Lin Xiang Wang Yu-Shan Du Chao Huang Yu-Rui Zhu State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China College of Geosciences China University of Petroleum(Beijing)Beijing102249China Shengli Oilfield SINOPECDongying257000ShandongChina

The controlling factors of organic-rich shale accumulation is essential for the exploration and development of shale oil and gas *** sedimentary environment plays a vital role in the formation of organic-rich sediments in lacustrine *** article unravels the mineralogy,geochemistry,and paleoenvironmental evolution during the deposition of the Paleogene Shahejie Formation(Es_(3)^(L)).It discusses the effects of paleoclimate,paleosalinity,paleoredox conditions,paleowater depth,and paleoproductivity on organic matter(OM)***,the OM enrichment model was *** results show that the mineralogical compositions are mainly composed of calcite(avg.40.13%),quartz(avg.21.64%)and clay minerals(avg.24.07%),accompanied by dolomite(avg.7.07%),feldspar(avg.6.36%)and pyrite(avg.2.95%).The Es_(3)^(L) shale has a high abundance of OM,with total organic carbon(TOC)ranging from 1.07%to 5.12%.The organic matter type is mainly composed of type I-II_(1) kerogen,which is generally considered a good-quality source *** source of OM is a mixture of lower bacteria,algae,and *** the early sedimentary period,the paleoclimate was dry and cold,with high salinity,intense reducibility,and relatively low *** the late sedimentary period,the climate became warmer and more *** a result,the salinity decreased to a level that was suitable for biological reproduction,and productivity increased gradually due to the input of terrigenous *** and paleoclimate determined the environment of the sedimentary period,in addition,paleoproductivity and paleoredox condition indicated the formation and preservation conditions of *** warm and humid climate,brackish water,suitable reduction conditions and high productivity are the favorable conditions for the generation and preservation of organic *** research results may have implications for the genetic mechanisms of organic matter *** will provide theoret

关键词： Elemental geochemical Paleoenvironment Organic matter accumulation Paleogene shahejie formation zhanhua sag Bohai Bay Basin

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Paleosalinity reconstruction in offshore lacustrine basins based on elemental geochemistry:a case study of Middle Upper Eocene Shahejie Formation,zhanhua sag,Bohai Bay Basin

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Journal of Oceanology and Limnology 2024年第4期42卷 1087-1105页

作者： Long SUN Shenghe WU Dali YUE Wenfu CUI National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Shengli Oil Production Plant Shengli Oilfield CompanySINOPECDongying 257400China

Salinity is a crucial property of water body and is essential for the restoration of paleoecology and ***,the theoretical method of application of elemental geochemical proxies to paleosalinity reconstruction is still ***,accurate determination and reconstruction of paleosalinity and its variation in an offshore lacustrine basin have been extremely challenging thus *** study presents detailed elemental geochemical investigations from the zhanhua sag in the southern Bohai Bay Basin to reconstruct the salinity variation in the Paleogene Eocene Shahejie Formation(50.8-33.9 Ma).Based on the variation of strontium barium ratio(Sr/Ba)and boron gallium ratio(B/Ga),we determined three typical salinity types of water body:salty water(Sr/Ba>0.5,B/Ga>6),brackish water(0.2

关键词： paleosalinity paleoclimate zhanhua sag Middle-Upper Eocene Shahejie Formation

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Quantitative Architectural Anatomy of the Meandering Fluvial Deposits of the Neogene Upper Guantao Formation in zhanhua sag,Bohai Bay Basin,China

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Journal of Earth Science 2023年第6期34卷 1861-1872页

作者： Yupeng Qiao Longwei Qiu Jun Wang Fan Song Ziyi Song Abigail Kuttin Colloge of Petroleum&Gas Engineering Liaoning Petrochemical UniversityFushun 113001China School of Geosciences China University of PetroleumQingdao 266580China Exploration and Development Research Institute Shengli Oilfield CompanySINOPECDongying 257015China

The residual oil in the fluvial reservoir of Gudong Oilfield is still widely developed even after decades of *** order to explore the remaining oil in the subsurface fluvial reservoir,we need to have a better understanding on fluvial sandbody *** paper aims to demonstrate how to quantify anatomy on meandering fluvial *** data from core descriptions of Guantao Formation in Gudong Oilfield were used to identify architectural *** upper Guantao Formation consists of ten lithofacies composing five different types of architectural *** integrating the available core,well logs,and seismic data,the fluvial sandbody distribution was *** characterize the fluvial channel geomorphology,we used seismic inversion to explore the stratigraphic correlation and stacking patterns of different channels,and the sandbody isopach map was obtained by the sandbody thickness in each *** architectural elements distribution in the plane was mapped by the sandbody isopach map and its profile *** to the investigation of meandering fluvial outcrops,subsurface meandering fluvial seismic geomorphology,and modern river morphology,the upstream-bar portions are always eroded because of the downstream channel *** on the morphometric parameters(bar width/looplength,upstream deflection angle,downstream deflection angle,etc.)of modern meandering river(Ob River)were obtained from the Google *** is found that the bar width/looplength and upstream deflection angle,upstream deflection angle and downstream deflection angle in modern meandering river have a good relationship,and we can have a quantitative architectural characterization on the point *** study quantified lithofacies thickness and proportion in different architectural elements of Guantao Formation,which ensures a high resolution anatomy on the small scale *** using this method,the lithofacies proportion in

关键词： meandering fluvial architectural characteristics point bar migration quantitative architectural anatomy Guantao Formation zhanhua sag stratigraphy petroleum industry

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Shale Lithofacies and Sedimentary Environment of the Third Member,Shahejie Formation,zhanhua sag,Eastern China

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Acta Geologica Sinica(English Edition) 2022年第3期96卷 1024-1040页

作者： ZHU Xiaomin ZHANG Meizhou ZHU Shifa DONG Yanlei LI Chao BI Yuequan MA Lichi State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Shengli Oilfield Company SinopecDongyingShandong 257000China

Researches into shale lithofacies,their sedimentary environments and relationship benefit understanding both of sedimentary cycle division and unconventional hydrocarbon exploration in lacustrine *** on a 100~300-m-thick dark shale,mudstone and limestone encountered in the lower third member of the Eocene Shahejie Formation(Es3l member)in zhanhua sag,Bohai Bay Basin,eastern China,routine core analysis,thin sectioning,scanning electron microscopy(SEM),mineralogical and geochemical measurements were used to understand detailed facies characterization and paleoclimate in the *** Es3l shale sediment includes three sedimentary cycles(C3,C2 and C1),from bottom to top,with complex sedimentary characters and spatial *** terms of the composition,texture,bedding and thickness,six lithofacies are recognized in this *** geochemical parameters,such as trace elements(Sr/Ba,Na/Al,V/Ni,V/(V+Ni),U/Th),carbon and oxygen isotopes(δ^(18)O,δ^(13)C),and total organic carbon content(TOC)indicate that the shales were deposited in a deep to semi-deep lake,with the water column being salty,stratified,enclosed and *** cycles C3 and C2 of the middle-lower sections,the climate was arid,and the water was salty and *** and laminar mudstone-limestone was deposited with moderate organic matter(average TOC 1.8%)and good reservoir quality(average porosity 6.5%),which can be regarded as favorable *** the C1 cycle,a large amount of organic matter was input from outside the basin and this led to high productivity with a more humid *** calcareous mudstone was deposited,and this is characterized by high TOC(average 3.6%)and moderate porosity(average 4%),and provides favorable source rocks.

关键词： unconventional energy resources shale lithofacies sedimentary environment Shahejie Formation zhanhua sag Bohai Bay basin

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