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Pore Characteristics of Lacustrine Shale Oil Reservoir in the Cretaceous Qingshankou Formation of the Songliao Basin, NE China

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  • Xiaomeng Cao

    (State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China
    School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China)

  • Yuan Gao

    (State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China
    School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China)

  • Jingwei Cui

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China)

  • Shuangbiao Han

    (College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China)

  • Lei Kang

    (State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China
    School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China)

  • Sha Song

    (Geological Engineering and Geomatics, Chang’an University, Xi’an 710054, China)

  • Chengshan Wang

    (State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China
    School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China)

Abstract

Shale oil is hosted in nanopores of organic-rich shales, so pore characteristics are significant for shale oil accumulation. Here we analyzed pore characteristics of 39 lacustrine shale samples of the Late Cretaceous Qingshankou Formation (K 2 qn) in the Songliao Basin, which is one of the main shale oil resource basins in China, using field emission-scanning electron microscopy (FE-SEM), and low-pressure nitrogen adsorption. We accomplished fractal analysis, correlation analysis using correlation matrix and multidimensional scaling (MDS), and prediction of fractal dimensions, which is the first time to predict pore fractal dimensions of shales. Interparticle pores are highly developed in K 2 qn. These shales have mesoporous nature and slit-shaped pores. Compared with the second and third members (K 2 qn 2,3 ), the first member of the Qingshankou Formation (K 2 qn 1 ) has a larger average pore diameter, much smaller surface area, fewer micropores, simpler pore structure and surface indicated by smaller fractal dimensions. In terms of pore characteristics, K 2 qn 1 is better than K 2 qn 2,3 as a shale oil reservoir. When compared with marine Bakken Formation shales, lacustrine shales of the Qingshankou Formation have similar complexity of pore structure, but much rougher pore surface. This research can lead to an improved understanding of the pore system of lacustrine shales.

Suggested Citation

  • Xiaomeng Cao & Yuan Gao & Jingwei Cui & Shuangbiao Han & Lei Kang & Sha Song & Chengshan Wang, 2020. "Pore Characteristics of Lacustrine Shale Oil Reservoir in the Cretaceous Qingshankou Formation of the Songliao Basin, NE China," Energies, MDPI, vol. 13(8), pages 1-25, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:8:p:2027-:d:347445
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    References listed on IDEAS

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    Cited by:

    1. Jiashun Luo & Zhengmeng Hou & Guoqing Feng & Jianxing Liao & Muhammad Haris & Ying Xiong, 2022. "Effect of Reservoir Heterogeneity on CO 2 Flooding in Tight Oil Reservoirs," Energies, MDPI, vol. 15(9), pages 1-21, April.
    2. Weizhu Zeng & Zhiguang Song, 2022. "Influences of Clay Mineral and Organic Matter on Nanoscale Pore Structures of the Cretaceous Lacustrine Shales in the Songliao Basin, Northeast China," Energies, MDPI, vol. 15(19), pages 1-16, September.
    3. Ivica Pavičić & Zlatko Briševac & Anja Vrbaški & Tonći Grgasović & Željko Duić & Deni Šijak & Ivan Dragičević, 2021. "Geometric and Fractal Characterization of Pore Systems in the Upper Triassic Dolomites Based on Image Processing Techniques (Example from Žumberak Mts, NW Croatia)," Sustainability, MDPI, vol. 13(14), pages 1-18, July.
    4. Yi Shu & Yanran Xu & Shu Jiang & Linhao Zhang & Xiang Zhao & Zhejun Pan & Tomasz P. Blach & Liangwei Sun & Liangfei Bai & Qinhong Hu & Mengdi Sun, 2020. "Effect of Particle Size on Pore Characteristics of Organic-Rich Shales: Investigations from Small-Angle Neutron Scattering (SANS) and Fluid Intrusion Techniques," Energies, MDPI, vol. 13(22), pages 1-23, November.

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