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Mechanical Property Measurements and Fracture Propagation Analysis of Longmaxi Shale by Micro-CT Uniaxial Compression

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  • Minyue Zhou

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institution of Earth Science, Chinese Academy of Science, Beijing 100029, China
    College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Yifei Zhang

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institution of Earth Science, Chinese Academy of Science, Beijing 100029, China
    College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Runqing Zhou

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institution of Earth Science, Chinese Academy of Science, Beijing 100029, China)

  • Jin Hao

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institution of Earth Science, Chinese Academy of Science, Beijing 100029, China)

  • Jijin Yang

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institution of Earth Science, Chinese Academy of Science, Beijing 100029, China
    College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China)

Abstract

The mechanical properties and fracture propagation of Longmaxi shale loading under uniaxial compression were measured using eight cylindrical shale specimens (4 mm in diameter and 8 mm in height), with the bedding plane oriented at 0° and 90° to the axial loading direction, respectively, by micro computed tomography (micro-CT). Based on the reconstructed three-dimensional (3-D) CT images of cracks, different stages of the crack growth process in the 0° and 90° orientation specimen were revealed. The initial crack generally occurred at relatively smaller loading force in the 0° bedding direction specimen, mainly in the form of tensile splitting along weak bedding planes. Shear sliding fractures were dominant in the specimens oriented at 90°, with a small number of parallel cracks occurring on the bedding plane. The average thickness and volume of cracks in the 90° specimen is higher than those for the specimen oriented at 0°. The geometrical characterization of fractures segmented from CT scan binary images shows that a specific surface area correlates with tortuosity at the different load stages of each specimen. The 3-D box-counting dimension (BCD) calculations can accurately reflect crack evolution law in the shale. The results indicate that the cracks have a more complex pattern and rough surface at an orientation of 90°, due to crossed secondary cracks and shear failure.

Suggested Citation

  • Minyue Zhou & Yifei Zhang & Runqing Zhou & Jin Hao & Jijin Yang, 2018. "Mechanical Property Measurements and Fracture Propagation Analysis of Longmaxi Shale by Micro-CT Uniaxial Compression," Energies, MDPI, vol. 11(6), pages 1-18, May.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1409-:d:149954
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    References listed on IDEAS

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    1. Xiao Li & Yongting Duan & Shouding Li & Runqing Zhou, 2017. "Study on the Progressive Failure Characteristics of Longmaxi Shale under Uniaxial Compression Conditions by X-ray Micro-Computed Tomography," Energies, MDPI, vol. 10(3), pages 1-13, March.
    2. Hiroaki Yaritani & Jun Matsushima, 2014. "Analysis of the Energy Balance of Shale Gas Development," Energies, MDPI, vol. 7(4), pages 1-21, April.
    3. Yusong Wu & Xiao Li & Jianming He & Bo Zheng, 2016. "Mechanical Properties of Longmaxi Black Organic-Rich Shale Samples from South China under Uniaxial and Triaxial Compression States," Energies, MDPI, vol. 9(12), pages 1-24, December.
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    Cited by:

    1. Youqing Chen & Makoto Naoi & Yuto Tomonaga & Takashi Akai & Hiroyuki Tanaka & Sunao Takagi & Tsuyoshi Ishida, 2018. "Method for Visualizing Fractures Induced by Laboratory-Based Hydraulic Fracturing and Its Application to Shale Samples," Energies, MDPI, vol. 11(8), pages 1-14, July.
    2. Xiangxiang Zhang & Jianguo Wang & Feng Gao & Xiaolin Wang, 2018. "Numerical Study of Fracture Network Evolution during Nitrogen Fracturing Processes in Shale Reservoirs," Energies, MDPI, vol. 11(10), pages 1-22, September.

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