多尺度多孔介质有效气体输运参数的分形特征

徐鹏; 李翠红; 柳海成; 邱淑霞; 郁伯铭

doi:10.3799/dqkx.2017.104

Volume 42 Issue 8

Aug. 2017

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Xu Peng, Li Cuihong, Liu Haicheng, Qiu Shuxia, Yu Boming, 2017. Fractal Features of the Effective Gas Transport Coefficient for Multiscale Porous Media. Earth Science, 42(8): 1373-1378. doi: 10.3799/dqkx.2017.104

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Xu Peng, Li Cuihong, Liu Haicheng, Qiu Shuxia, Yu Boming, 2017. Fractal Features of the Effective Gas Transport Coefficient for Multiscale Porous Media. Earth Science, 42(8): 1373-1378. doi: 10.3799/dqkx.2017.104

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Fractal Features of the Effective Gas Transport Coefficient for Multiscale Porous Media

doi: 10.3799/dqkx.2017.104

1.
College of Science, China Jiliang University, Hangzhou 310018, China
2.
School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China

Received Date: 2017-02-15
Publish Date: 2017-08-15

Abstract

Abstract

The pore structures and connections in unconventional oil and gas resources are very complex, the size of which may vary several orders of magnitude from millimeter to nanometer. And gas transport process depends on both microstructure characteristics and gas properties in the multiscale porous media. As gas transport in multiscale porous media may involve multiple transport mechanisms such as no-slip and slip flow, transition flow, Knudsen and molecular diffusion, it is difficult to characterize the gas transport with continuum theory. Since it has been proven that natural pore structures indicate fractal scaling laws, fractal geometry is employed in this study to model the multiscale pore structures. The fractal dimensions are introduced to characterize the pore size distribution and tortuous flow path, and a mesoscopic model is developed to study the gas transport in multiscale porous media. The effective permeability and diffusion coefficient of multiscale porous media are derived and presented, and the effect of microstructures and gas properties on the equivalent transport properties is also discussed. This study may be helpful for the development of seepage theory and understanding the output mechanisms of unconventional oil and gas reservoirs.
- porous media,
- multiscale,
- fractal,
- gas transport,
- permeability,
- diffusion coefficient,
- petroleum geology

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References(25)

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