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Paleoenvironment of marine-continental transitional shales in the lower Permian Shanxi formation,southeastern Ordos Basin,China

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Energy Geoscience 2024年第3期5卷 221-233页

作者： Jia Tan Yuqiang Jiang Xingtao Li Chunhai Ji Yifan Gu Zhanlei Wang School of Geoscience and Technology Southwest Petroleum UniversityChengdu610500China The Unconventional Reservoir Evaluation Department PetroChina Key Laboratory of Unconventional Oil and Gas ResourcesChengdu610500China Project Department of Tight Oil and Gas Exploration and Development PetroChina Southwest Oil&Gas Field CompanyChengdu610056China PetroChina Coalbed Methane Company Beijing100028China shale Gas Research Institute PetroChina Southwest Oil&Gasfield CompanyChengdu610051China

The paleoenvironment of shales can be reconstructed to some extent using the combinations or concentrations of elements that correlate strongly with environmental *** this study,we analyzed rare earth elements(REEs),major elements,and trace elements in the marine-continental transitional shales(transitional shales for short)of the Shan 2^(3)submember of the Shanxi Formation in the southeastern Ordos *** purpose is to deduce the paleoenvironmental conditions of the shales,encompassing paleoredox,paleoclimate,paleoproductivity,and *** Shan 2^(3)submember comprises four sections,namely Shan 2^(3)-1,Shan 2^(3)-2,Shan 2^(3)-3,and Shan 2^(3)-*** Ba/Al,P/Al,and Cu/Al ratios,along with biogenic barium(Babio),indicate that the paleoproductivity of the submember peaked during the Shan 2^(3)-1 deposition and exhibited a downtrend upward in other *** in the Uau and the Ni/Co,V/Cr,U/Th,and V/Sc ratios suggest that suboxic conditions prevailed during the Shan 2^(3)-1 deposition,with the oxidation level gradually increasing from Shan 2^(3)-1 to Shan 2^(3)-4.C-value and the Sr/Cu ***/Rb cross-plot indicate a warm and arid paleoclimate during the Shan 2^(3)-1 deposition,which transitioned to cooler,drier conditions during the deposition of other *** sensitive to paleoclimate,such as the K/Rb and Th/U ratios,along with the ICV,PIA,and Chemical Index of Alteration(CIA),highlight elevated weathering from Shan 2^(3)-2 to Shan 2^(3)-4,with Shan 2^(3)-1 exhibiting the weakest weathering during its *** suggested by the REE data,the Zr/Sc ***/Sr cross-plot,provenance discriminant functions,and the cross-plots of Hf ***/Th,Th ***-Co,and∑REE ***/Yb,the sedimentary provenance for the transitional shales of the Shan 2^(3)submember is of multiple origins,with significant contributions from the Upper Continental Crust(UCC).Discriminant diagrams,including those of Th-Co-Zr/10,Th-Sc-Zr/10,La-Th-Sc,and K_(2)O/Na_(2)O

关键词： transitional shale Paleoenvironment Elemental geochemistry Upper Permian Shan 2^(3)submember Ordos basin

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Porosity model and pore evolution of transitional shales:an example from the Southern North China Basin

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Petroleum Science 2020年第6期17卷 1512-1526页

作者： Xiao-Guang Yang Shao-Bin Guo School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism Ministry of EducationBeijing 100083China

The evolution of shale reservoirs is mainly related to two functions:mechanical compaction controlled by ground stress and chemical compaction controlled by thermal *** simulation experiments were conducted to simulate the chemical compaction of marine-continental transitional shale,and X-ray diffraction(XRD),CO2 adsorption,N2 adsorption and high-pressure mercury injection(MIP)were then used to characterize shale diagenesis and ***,simulations of mechanical compaction adhering to mathematical models were performed,and a shale compaction model was proposed considering clay content and kaolinite *** advantage of this model is that the change in shale compressibility,which is caused by the transformation of clay minerals during thermal evolution,may be *** combination of the thermal simulation and compaction model may depict the interactions between chemical and mechanical *** interactions may then express the pore evolution of shale in actual conditions of ***,the obtained results demonstrated that shales having low kaolinite possess higher porosity at the same burial depth and clay mineral content,proving that other clay minerals such as illite-smectite mixed layers(I/S)and illite are conducive to the development of *** possessing a high clay mineral content have a higher porosity in shallow layers(3500 m).Both the amount and location of the increase in porosity differ at different geothermal *** geothermal gradients favor the preservation of high porosity in shale at an appropriate *** pore evolution of the marine-continental transitional shale is divided into five *** 2 possesses an Ro of 1.0%-1.6%and has high porosity along with a high specific surface *** 3 has an Ro of 1.6%-2.0%and contains a higher porosity with a low specific surface ***,Stage 4 has an Ro of 2.0%-2.9%with a low porosity and h

关键词： Thermal simulation Porosity model Pore evolution transitional shale Southern North China Basin Shanxi formation

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