摘要：Shales are generally anisotropic, which are characterized by low velocity in the bedding normal direction because of the presence of clay minerals, micro-cracks and kerogen. The anisotropy greatly influences the SRV (stimulated reservoir volume) fracturing of shale reservoirs during hydraulic fracturing. In this study, cylindrical shalesamples were cored from the outcrops of two types of shale (Lujiaping and Longmaxi group) along the bedding-parallel and bedding-normal direction. Surfaces of all the samples were rectified and polished to 10μm to ensure parallelism and minimum friction during testing. The velocity and permeability measurements of two types of shale were evaluated. Also the stress sensitivity coefficient of velocities and permeability were carried out. Our results showed that: (1) Longmaxi shale samples are much more anisotropic than Lujiaping shale samples. (2) Elastic velocity anisotropy is in good agreement with the permeability anisotropy. (3) Elastic velocities, permeability and elastic stress sensitivity are orientation-dependent. Nevertheless, the stress sensitivity parameters of permeability are orientation-independent. (4) For Longmaxi shale samples, the permeability of bedding-parallel samples is larger than that of bedding-normal samples. However, the elastic stress sensitivity is in opposite direction. This is influenced by the lamination of Longmaxi shales.
Copyright 2019 ARMA, American Rock Mechanics Association.

发表日期：2019-01-01

期刊分区（SCI为中科院分区）：无

收录情况：EI（工程索引）

发表期刊名称：53rd U.S. Rock Mechanics/Geomechanics Symposium

通讯作者：吴珊,陈浩东,王剑波

第一作者：王小琼,葛洪魁

论文类型：会议论文

论文概要：王小琼,吴珊,葛洪魁,陈浩东,王剑波，Experimental study on the anisotropy of shale with wave velocity and permeability，53rd U.S. Rock Mechanics/Geomechanics Symposium，2019，

论文题目：Experimental study on the anisotropy of shale with wave velocity and permeability