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Permeability (earth sciences)
About: Permeability (earth sciences) is a research topic. Over the lifetime, 15424 publications have been published within this topic receiving 288535 citations.
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TL;DR: Simulation of two-phase flow in a porous medium, which is represented by random, isotropic two- and three-dimensional networks containing up to 80 000 interconnected pore spaces, shows that the displacements are compact with a fractal interface between the fluids.
Abstract: We simulate two-phase flow in a porous medium, which is represented by random, isotropic two- and three-dimensional networks containing up to 80 000 interconnected pore spaces. The simulations are sufficiently large that macroscopic properties of the flow may be determined. For unstable viscous floods, we show that the displacements are compact with a fractal interface between the fluids. The fractal dimension is found as a function of viscosity ratio. For invasion percolation, where the displacement is controlled by capillary forces, and for viscous fingering, we calculate relative permeabilities in an averaged two-phase Darcy equation, which we show are functions of mean saturation. The relative permeabilities also depend on flow rate, which means that the two-phase Darcy equation is nonlinear, even with microscopic linear Poiseuille flow.
138 citations
TL;DR: In this article, the authors used power law fracture length and fracture permeability distributions to model the equivalent permeability of two-dimensional (2D) discrete fracture networks by using numerical simulations and theoretical arguments.
Abstract: [1] Field observations have revealed that the diffusion properties of fractured materials are strongly influenced by the presence of fractures. Using power law fracture length and fracture permeability distributions currently observed on natural fractured networks, we model the equivalent permeability of two-dimensional (2D) discrete fracture networks by using numerical simulations and theoretical arguments. We first give the dependence of the network equivalent permeability, obtained at the scale of the network, on the characteristic power law exponents of the fracture length and fracture permeability distributions. We especially show that the equivalent permeability depends simply on the geometrical mean of the local fracture permeability distribution. Such networks are characterized by an increase of permeability with scale without limitations, provided that the fracture length and fracture permeability distributions are broad enough. Although a correlation length cannot be systematically defined, the flow structure is still characterized by simple properties. The flow is either extremely channeled in one dominant path or distributed in several separated structures. We show finally that the observed scale effects and flow structure are very different from the one obtained in the lognormal fracture permeability distribution case.
138 citations
TL;DR: In this paper, the authors evaluate physical and mechanical properties of pervious concrete including density, strength, porosity, and permeability, and the relationship between properties dependent on coarse aggregate size.
138 citations
Book•
31 Jul 1993
TL;DR: In this article, the authors present a model of fluid flow in a single discontinuity and quantify the percolation properties of the fluid flow through a given discontinuity in a rock.
Abstract: Rock and rock mass permeability. Rock discontinuity characterization. Fluid flow in a single discontinuity. Connectivity, scale effects and percolation theory. Permeability and depth in rock masses. Numerical methods of modelling flow. Index.
138 citations
TL;DR: In this article, the porosity and permeability models used for reservoir and geomechanical coupled simulation have been established in order to simulate the influence of these alterations in predicting or evaluating coalbed methane (CBM) production.
137 citations