Simulation of diagenesis and permeability variation in two-dimensional rock structure |
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| Authors: | S Sadhukhan T Dutta S Tarafdar |
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| Institution: | Condensed Matter Physics Research Centre, Physics Department, Jadavpur University, Kolkata 700032;, India. E-mail: Physics Department, St. Xavier's College, Kolkata 700016;, India |
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| Abstract: | A model is suggested to simulate the physical aspect of diagenesis in porous rocks. A bidisperse ballistic deposition model with relaxation of deposited grains is used to generate the porous structure. Sedimentation and erosion are allowed to restructure the pore space as a fluid flows through the rock. The effect of this restructuring of the pore space on permeability is studied. The Navier–Stokes equation is solved numerically by the finite difference method to determine the pressure and velocity distributions in the pore space. We find that though deposition is the dominant process in our model of diagenesis, reducing the porosity, the permeability may increase dramatically in some cases. These are when the erosion takes place at a single narrow constriction in the pore channel. |
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| Keywords: | diagenesis permeability porous medium sedimentary rock |
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