1. A lattice-Boltzmann study of permeability-porosity relationships and mineral precipitation patterns in fractured porous media
- Author
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Andrea Parmigiani, Mehrdad Ahkami, Xiang-Zhao Kong, Paolo Roberto Di Palma, and Martin O. Saar
- Subjects
Materials science ,Advection ,Lattice Boltzmann methods ,Soil science ,010103 numerical & computational mathematics ,Thermal diffusivity ,01 natural sciences ,Computer Science Applications ,Reaction rate ,Computational Mathematics ,Permeability (earth sciences) ,Computational Theory and Mathematics ,Fluid dynamics ,0101 mathematics ,Computers in Earth Sciences ,Porous medium ,Porosity - Abstract
Mineral precipitation can drastically alter a reservoir’s ability to transmit mass and energy during various engineering/natural subsurface processes, such as geothermal energy extraction and geological carbon dioxide sequestration. However, it is still challenging to explain the relationships among permeability, porosity, and precipitation patterns in reservoirs, particularly in fracture-dominated reservoirs. Here, we investigate the pore-scale behavior of single-species mineral precipitation reactions in a fractured porous medium, using a phase field lattice-Boltzmann method. Parallel to the main flow direction, the medium is divided into two halves, one with a low-permeability matrix and one with a high-permeability matrix. Each matrix contains one flow-through and one dead-end fracture. A wide range of species diffusivity and reaction rates is explored to cover regimes from advection- to diffusion-dominated, and from transport- to reaction-limited. By employing the ratio of the Damkohler (Da) and the Peclet (Pe) number, four distinct precipitation patterns can be identified, namely (1) no precipitation (Da/Pe 100), (3) fracture isolation (1 1), and (4) diffusive precipitation (1 < Da/Pe
- Published
- 2020