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2021 Vol. 27, No. 1
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JIA Suogang, WAN Youyu, WANG Qian, LIU Shiduo, LIU Youming, WANG Zhicheng, YE Yu, QI Chunyan. 2021. Research on the micro-scale method for testing the mechanical anisotropy of shale. Journal of Geomechanics, 27(1): 10-18. doi: 10.12090/j.issn.1006-6616.2021.27.01.002
Citation: JIA Suogang, WAN Youyu, WANG Qian, LIU Shiduo, LIU Youming, WANG Zhicheng, YE Yu, QI Chunyan. 2021. Research on the micro-scale method for testing the mechanical anisotropy of shale. Journal of Geomechanics, 27(1): 10-18. doi: 10.12090/j.issn.1006-6616.2021.27.01.002
shu

Research on the micro-scale method for testing the mechanical anisotropy of shale

  • 1.

    Petrochina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China

  • 2.

    CNPC Engineering Technology R&D Company Limited, Beijing 102206, China

  • 3.

    Beijing Huamei Inc. CNPC, Beijing 100028, China

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Received Date:  12 December 2019
Revised Date:  31 October 2020
Publish Date:  28 February 2021
    Abstract

  • The mechanical anisotropy of shale is an important basic parameter for the study of in-situ stress, sidewall stability and hydraulic fracture propagation. In view of the limitations and low success rate for sample preparation in macro-scale tests, we chose clastic rocks and fragmentized blocks which were easily found as the subjects for micro-scale tests, and used continuous stiffness measurements to carry out the nano-indentation tests on the shale samples with horizontal bedding and vertical bedding. The test data were analyzed on three main mineral matrices which were identified by the classification rule of hardness. And the hardness and young's modulus of the shale clay matrix were calculated by contact stiffness measurements and the fracture toughness by energy method. The test results proved the reasonability and convenience of the classification rule of hardness in processing nano-indentation data. Shale clay matrix is anisotropic at the nano-scale while the mechanical parameters at the nano-scale are related to the bedding direction. The anisotropy of each mechanical parameter varies in intensity. The anisotropy of young's modulus is weak, while that of fracture toughness is strong. The fracture toughness with horizontal bedding is 80% of that with vertical bedding.

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