The effect of anisotropy on the Young's moduli and Poisson's ratios of shales
The effect of anisotropy on the Young's moduli and Poisson's ratios of shales
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DOI：
10.1111/j.1365-2478.2012.01130.x
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发表时间：
2013-03
影响因子：
2.6
通讯作者：
C. Sayers
中科院分区：
文献类型：
--
作者：
C. Sayers
杨氏模量和泊松比是地质力学应用所必需的，例如水力压裂设计、井筒稳定性和岩石破坏分析、原地应力测定以及储层和围岩对孔隙压力和应力变化的响应评估。页岩通常是各向异性的，忽略页岩各向异性的模型可能无法正确描述地质力学行为。页岩中的各向异性是由各向异性粘土颗粒、干酪根包裹体、微裂纹、低纵横比孔隙和分层的部分排列造成的。对于页岩，平行于层理E1测得的杨氏模量通常大于垂直于层理E3测得的杨氏模量。但是，垂直于层理施加的应力和平行于层理测量的应变对应的泊松比ν31可以大于、等于或小于平行于层理施加的应力和平行于层理测量的应变对应的泊松比ν12。
Young's modulus and Poisson's ratio are required for geomechanics applications such as hydraulic fracture design, analysis of wellbore stability and rock failure, determination of in situ stress and assessment of the response of reservoirs and surrounding rocks to changes in pore pressure and stress. Shales are usually anisotropic and models that neglect shale anisotropy may fail to describe geomechanical behaviour correctly. Anisotropy in shales results from a partial alignment of anisotropic clay particles, kerogen inclusions, microcracks, low‐aspect ratio pores and layering. For shales, the Young's modulus measured parallel to bedding E1 is usually greater than the Young's modulus measured perpendicular to bedding E3. However, the Poisson's ratio ν31 corresponding to stress applied perpendicular to bedding and strain measured parallel to bedding can be greater than, equal to, or less than the Poisson's ratio ν12 for stress applied parallel to bedding and strain measured parallel to bedding.