Shale gas accumulation potential of the Upper Cretaceous Qingshankou Formation in the southeast Songliao Basin,NE China |
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| Institution: | 1. College of Earth Sciences, Jilin University, 130061 Changchun, China;2. Key Laboratory of Oil Shale and Coexistent Energy Minerals of Jilin Province, 130061 Changchun, China;3. Key Laboratory for Evolution of Past Life and Environment in Northeast Asia (Jilin University), Ministry of Education, 130026 Changchun, China;4. China National Offshore Oil Corporation (Tianjin Branch), 300452 Tianjin, China;5. Daqing Oil Field Company, 163113 Daqing, China;1. Statoil, Sandsliveien 90, Bergen NO-5020, Norway;2. Statoil, Svanholmen 8, Sandnes NO-4313, Norway;3. Department of Earth Science, University of Bergen, Norway;1. Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX 78713, USA;2. BASA Resources Inc., Dallas, TX, USA;1. GeoBioTec, Departamento de Geociências, Universidade de Aveiro, Portugal;2. MARE, Departamento de Ciências da Terra, Universidade de Coimbra, Portugal;3. Institut für Geologie, Leibniz Universität Hannover, Germany;4. Institute for Geology, Mineralogy and Geophysics, Ruhr-Universität Bochum, Germany;1. Geology Department, Faculty of Science, Cairo University, Egypt;2. MARUM – Center for Marine and Environmental Sciences, University of Bremen, Germany;3. Institute for Geology, Universität Hamburg, Germany;4. Department of Geodynamics and Sedimentology, University of Vienna, Austria;1. Statoil, Arkitekt Ebbelsvei, No-7053, Ranheim, Norway;2. Statoil, Strandvegen 4, 7500 Stjørdal, Norway;1. EMR | Energy and Mineral Resources Group, Reservoir-Petrology, RWTH Aachen University, Aachen, Germany;2. Helmholtz Zentrum Potsdam GFZ, German Research Center for Geoscience, Potsdam, Germany;3. Geoscience Center of the University of Göttingen (GZG), Göttingen, Germany;4. Wintershall Holding GmbH, Kassel, Germany;5. Institute of Applied Geosciences, Structural Geology & Tectonics, Karlsruhe Institute of Technology, Karlsruhe, Germany;6. TTE Reservoir-Geology, KIT Campus Transfer GmbH, Karlsruhe, Germany |
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| Abstract: | The purpose of this paper is to provide both quantitative and qualitative visual analyses of the nanometer-scale pore systems of immature and early shales, as well as to discuss the biogenic shale gas accumulation potential of the Upper Cretaceous section of the Songliao Basin. To achieve these goals, mineralogical compositions were determined using transmitted and reflected light petrography, X-ray diffractometry and scanning electron microscopy (SEM), while the nanostructure morphology and pore size distributions (PSDs) were quantified using field emission scanning electron microscopy (FE-SEM) and low-pressure nitrogen gas adsorption (LP-N2GA). The results of these analyses indicate that nanometer-scale pores are well developed in the immature and low-maturity shale, and that these shales contain many types of reservoir pores. The mudstone layer of the Qingshankou Formation (K2qn) contains a high permeability characteristic and good rock fracturing conditions, while it is also thick (>9 m in thickness) and rich in fine organic matter. Overall, analysis of the entire formation using source rock and reservoir evaluations indicate that the first member of the Qingshankou Formation (K2qn1) has a greater shale gas accumulation potential than the second and third members of the Qingshankou Formation (K2qn2-3). |
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| Keywords: | Shale gas Accumulation potential Nanostructure morphology Immature to early mature shale Songliao basin |
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