Effect of Bedding Plane on the Permeability Evolution of Typical Sedimentary Rocks Under Triaxial Compression
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TECHNICAL NOTE
Effect of Bedding Plane on the Permeability Evolution of Typical Sedimentary Rocks Under Triaxial Compression Yingchun Li1 · Chuangzhou Wu2,3 · Bo‑An Jang2 Received: 11 November 2019 / Accepted: 11 July 2020 © Springer-Verlag GmbH Austria, part of Springer Nature 2020
Keyword Sedimentary rocks · Bedding plane · Permeability evolution · Anisotropy List of symbols A Constant of the Lorentz function k Permeability k0 Initial permeability L Specimen length P1 Pressure in upstream reservoir Pf Final pressure ΔP Magnitude of step increase in pressure pwd Pore pressure of downstream pwu Pore pressure of upstream R2 Determination of coefficient S Cross-sectional area of specimen t Time V1 Volume of upstream reservoir V2 Volume of downstream reservoir w Constant of the Lorentz function 𝛼 Constant in equation 𝛽 Fluid compressibility 𝜀1 Axial strain p 𝜀1 Axial strain at peak stress σini Initial seating stress σ1 Axial stress σ3 Confining pressure σd Differential stress σp Peak stress 𝜇 Fluid viscosity
* Chuangzhou Wu [email protected] 1
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
2
Department of Geophysics, Kangwon National University, Chuncheon 24341, Republic of Korea
3
Ocean College, Zhejiang University, Zhoushan 316021, China
1 Introduction The hydro-mechanical properties of rocks are crucial to many geo-engineering edifices in the fields of mining, civil, deep geological repository, and conventional/unconventional reservoir exploitation (Gensterblum et al. 2015; Ma 2015; Ji et al. 2020). Adequate understanding of the permeability of rocks under different geological settings accommodates effective pursuits of these activities. For example, groundwater inflow seriously threatens the stability and regular operation of underground tunnels (Perazzelli and Anagnostou 2014; Yang et al. 2014; Pan and Dias 2018; Ma et al. 2019). Also, in the facet of petroleum engineering, predicting the permeability variation of rocks subjected to loadings is prerequisite for hydraulic stimulation. The water flow highly depends on the hydraulic and mechanical properties of the rock masses due to the coupling between permeability and in situ stress. Sedimentary rocks that are commonly encountered underground usually contain geological discontinuities, such as bedding planes. The presence of these bedding planes that are strongly anisotropic affects the hydromechanical characteristics of the sedimentary rocks. Considerable interests have emphasized the permeability of sedimentary rocks in the original states and under certain loading conditions, such as shale (Bhandari et al. 2015; Mokhtari and Tutuncu 2015; Li et al. 2017, 2019b, 2020; Wu et al. 2017, 2018, 2019b; Cui et al. 2018), sandstone (Zhu and Wong 1997; Zhu et al. 1997; Li et al. 1997; Clavaud et al. 2008; Dong et al. 2010; Baud et al. 2012; Alam et al. 2014; Chen et al. 2017; Wang et al. 2018; Baizhanov et al. 2019), limestone (Han et al. 2016; Meng et al. 2019)
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