Analytical Solutions for Pore-Fluid Flow Focusing Within Inclined Elliptic Inclusions in Pore-Fluid-Saturated Porous Rocks: Solutions Derived in an Elliptical Coordinate System |
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Authors: | Chongbin Zhao B E Hobbs A Ord Shenglin Peng Liangming Liu and H B Mühlhaus |
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Institution: | (1) Computational Geosciences Research Centre, Central South University, Changsha, Hunan, China;(2) CSIRO Division of Exploration and Mining, P. O. Box 1130, Bentley, WA, 6102, Australia |
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Abstract: | Exact analytical solutions have been derived rigorously for the pore-fluid velocity, pore-fluid-flow focusing factor, stream
function and excess pore-fluid pressure around and within a buried inclined elliptic inclusion in pore-fluid-saturated porous
rocks. The geometric characteristics of the buried inclined elliptic inclusion are represented by the aspect ratio and dip
angle of the inclusion, while the hydrodynamic characteristic is represented by the permeability ratio of the elliptic inclusion
to its surrounding rock. Since an elliptic inclusion of any aspect ratio can be used to approximately represent geological
faults and cracks, the present analytical solutions can be used to investigate the pore-fluid-flow patterns around buried
faults and cracks within the crust of the Earth. Therefore, the present analytical solution not only provides a better understanding
of the physics behind the pore-fluid-flow focusing problem around and within buried faults and cracks, but also provides a
valuable benchmark solution for validating any numerical method in dealing with this kind of pore-fluid-flow focusing problem.
The pore-fluid-flow focusing factor of a buried elliptic inclusion is demonstrated to be dependent on the aspect ratio, the
permeability ratio and the dip angle. |
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Keywords: | theoretical analysis analytical solution pore-fluid flow buried inclined elliptic inclusion |
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