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Diagenetic mineralogy and its effect on the reservoir properties of the sandstones of the Permian of S120 block(Sulige gas field),Ordos Basin,NW China

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Journal of Palaeogeography 2022年第3期11卷 360-386页

作者： Qi Wan Ai-Ping Fan Ren-Chao Yang nils lenhardt Shandong Provincial Key Laboratory of Depositional Mineralization&Sedimentary Minerals Shandong University of Science and TechnologyQingdao266590China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao266071China Department of Geology University of PretoriaPrivate Bag X200028PretoriaSouth Africa

The characteristics of diagenetic minerals and their effects on reservoir quality of the tight sandstones of the Permian in Sulige gas field of the Ordos Basin were studied through observations on thin sections,scanning electron microscopy,energy dispersive spectroscopy analysis and electron microprobe *** minerals in the Permian sandstones consist of illite,kaolinite,chlorite,siliceous and calcite *** amounts of intercrystalline pores between kaolinite and illite provide channels for acidic fluids flow and thereby were conducive to the formation of clastic solution pores,intergranular solution pores and composite *** chlorite occurs in the form of three morphotypes as grain-coating,pore-lining and ***-coating and pore-lining chlorite with different crystal shapes occur as coatings on the framework ***-filling chlorite precipitated as discrete flaky plates in pore *** microcrystals developed but quartz overgrowth did not develop because of the occurrence of porelining ***,in turn,led to the preservation of primary pores by occupying potential nucleation sites for quartz overgrowth and thereby preventing quartz microcrystals from merging into quartz *** process is regarded as the most important for influencing the quality of the lithophysical *** cement was mainly precipitated during a late diagenetic stage and has a negative effect on the reservoir *** study provides important insights into analyzing the relationship between diagenetic minerals and reservoir quality and the results are directly applicable to the exploration and development of tight sandstone reservoirs all over the world.

关键词： Ordos basin Sulige gas field Permian Diagenetic processes Siliceous cement Chlorite

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Syndepositional Fault Control on Sandbody Distribution at Two Eocene Confluence Deltas in the Dongying Depression,Bohai Bay Basin(Eastern China)

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Journal of Earth Science 2023年第4期34卷 1095-1111页

作者： Renchao Yang Yang Li Aiping Fan nils lenhardt Shuvabrata De Jie Chen Shandong Provincial Key Laboratory of Depositional Mineralization&Sedimentary Minerals Shandong University of Science and TechnologyQingdao 266590China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China Department of Geology University of PretoriaPrivate Bag X20Pretoria 0028South Africa School of Earth Sciences East China University of TechnologyNanchang 330013China

The prediction of sandstone distribution is the main target for hydrocarbon exploration and petroleum reservoir engineering,especially in a rift basin with a complex geological *** the Middle Eocene,the Dongying and Yong’an deltas converged in the Dongying depression of the Bohai Bay Basin,eastern *** far,studies on the control of the existing syndepositional faults on the deltaic sandbodies of the two confluence deltas have been largely *** this contribution,the sedimentary characteristics and spatial distribution of the two deltas,converging in the Dongying depression,were *** addition,the morphodynamic controlling factors of the deposits of the two deltas were identified based on core examination,log analysis,and seismic data *** delta progradation,the sandbodies of the initially separated deltas were affected by the development of syndepositional tensional faults,which eventually also influenced the distribution of the sandstone *** results of this study can not only be applied to petroleum reservoir engineering but also provide important new information for the studies on delta sandbody all over the world.

关键词： lacustrine basin syndepositional fault delta deposits tectonic-depositional model Dongying depression Shahejie Formation tectonics.

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