Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2017, Vol. 28 ›› Issue (11): 163 doi: 10.1007/s41365-017-0317-5

• NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH • Previous Articles     Next Articles

Investigating microstructure of Longmaxi shale in Shizhu area, Sichuan Basin, by optical microscopy, scanning electron microscopy and micro-computed tomography

Yu Wang 1,2 Li-Hua Wang 1,2 Jian-Qiang Wang 1,2 Zheng Jiang 1,2 Chan Jin 1,2 Yan-Fei Wang 3   

  1. 1 Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2 Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
    3 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
  • Contact: Li-Hua Wang E-mail:lhwang@sinap.ac.cn
  • Supported by:

    This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB1002010), the Major Program for the Fundamental Research of Shanghai Committee of Science and Technology (No. 12JC1410400) and the National Natural Science Foundation of China for Distinguished Young Scholars (No. 41325016).

Yu Wang, Li-Hua Wang, Jian-Qiang Wang, Zheng Jiang, Chan Jin, Yan-Fei Wang. Investigating microstructure of Longmaxi shale in Shizhu area, Sichuan Basin, by optical microscopy, scanning electron microscopy and micro-computed tomography.Nuclear Science and Techniques, 2017, 28(11): 163     doi: 10.1007/s41365-017-0317-5

Abstract:

Microstructure of shale formation is the key to understanding its petrophysical and chemical properties. Optical microscopy, scanning electron microscopy and micro-computed tomography (μ-CT) have been combined for characterization of microstructure of Longmaxi (LMX) shale from Shizhu area, Sichan Basin. The results indicate that laminated LMX shale consists of mineral matrix-rich layers and organic matter (OM)-rich layers at micrometer scale in two and three dimensions. Mineral matrix layers, mainly consisting of interparticle pores and intraplatelet pores, are approximately parallel to the bedding plane. Pyrite-rich layer, mainly containing intercrystalline pores, shows a strong preferred orientation parallel to the bedding plane. OM-rich layer, mainly containing OM pores, seems to be discontinuous. In addition, intercrystalline pores are enriched in some layers, while OM pores are distributed irregularly in matrix layers. This vertical heterogeneity of pore microscopic structures in LMX shale is of great importance to understand its petrophysical and chemical properties.

Key words: Micro-computed tomography, Pore microstructure, Heterogeneity, Matrix layers, Longmaxi shale