A computing method of shale permeability based on pore structures

被引：16

作者：

Sun, Hai ^{[1
,2
]}

Yao, Jun ^{[1
]}

Zhang, Lei ^{[1
]}

Wang, Chen-Chen ^{[1
]}

Sun, Zhi-Xue ^{[1
]}

Yan, Yong-Ping ^{[3
]}

Pang, Peng ^{[3
]}

机构：

[1] School of Petroleum Engineering in China University of Petroleum

[2] School of Geosciences in China University of Petroleum

[3] Oil and Gas Technology Research Institute of Changqing Oilfield Company

来源：

Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2014年 / 38卷 / 02期

关键词：

Digital rock; Lattice Boltzmann method; Markov chain Monte Carlo method; Permeability; Shale gas;

D O I：

10.3969/j.issn.1673-5005.2014.02.014

中图分类号：

学科分类号：

摘要：

A modified Darcy' s law with apparent permeability is used to describe the gas transport mechanisms in tight shale rocks, and the apparent permeability can be correlated to the intrinsic permeability and porosity of the rocks, which are difficult to measure using conventional experimental methods. A new computing method for the intrinsic permeability, porosity and apparent permeability of shale was proposed based on the data obtained from pore structure images. Firstly, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to analyze the mineral compositions and pore structures of a shale rock sample. Then a 3D digital rock was constructed using the Markov chain Monte Carlo (MCMC) method, and the rock' s parameters, such as intrinsic permeability and porosity, were calculated using the lattice Boltzmann method (LBM). Finally, a model of the correlation between the intrinsic permeability and porosity of the shale rock was established, and the apparent permeability was calculated. The results show that the main pores in the shale matrix can be classified as nano-micro pores. The apparent permeability is found, when the Knudsen number is less than 0.01, to be equal to the intrinsic permeability, and the Darcy's law can be used. When the Knudsen number is higher than 0.01, the Darcy's law cannot be used, and the higher the Knudsen number and the smaller the intrinsic permeability and pressure, the bigger the deviation between the apparent permeability and the intrinsic permeability.

引用

页码：92 / 98

页数：6

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