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Characterization of Mineral Dissolution in Fracture-Pore Type Rocks Using the Lattice Boltzmann Method.

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Mineral dissolution in fractured-pore rocks impacts subsurface applications. This study models rock structures to predict permeability changes, crucial for engineering design.

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Area of Science:

  • Geosciences
  • Computational modeling
  • Geochemistry

Background:

  • Mineral dissolution in fractured-pore rocks is vital for petroleum extraction, geothermal energy, and carbon sequestration.
  • Understanding geometric topology and permeability evolution is key for scaling research and engineering design.

Purpose of the Study:

  • To develop a model for synthetic fracture-pore rock structures with varying matrix heterogeneity.
  • To simulate mineral dissolution and quantify permeability evolution under different conditions.

Main Methods:

  • Integrated a linear Boolean model with a self-affine rough surface approach.
  • Employed the dual-distribution function lattice Boltzmann method for simulations.
  • Analyzed mineral dissolution across a spectrum of Péclet (Pe) and Damköhler (Da) numbers.

Main Results:

  • Mechanical aperture and reactive surface area are mainly controlled by the Da number.
  • Increased matrix heterogeneity causes nonlinear permeability changes under high Pe and Da conditions.
  • A predictive diagram for permeability evolution was developed.

Conclusions:

  • The study provides insights into permeability evolution during mineral dissolution in heterogeneous fractured-pore rocks.
  • The findings are essential for optimizing subsurface applications like CO2 sequestration and geothermal energy extraction.