Image-based modeling of gas adsorption and deformation in porous media

Scientific Reports
Sahar BakhshianKristian Jessen

Abstract

Understanding adsorption of CO2 in porous formations is crucial to its sequestration in geological formations. We describe a model for adsorption of CO2 and the deformation that it induces in a sandstone formation over wide ranges of temperature and pressure. The model couples the thermodynamics of sorption with elastic deformation of the solid. Finite-element computations are then used in order to compute CO2 adsorption isotherms along with the induced strain in the formation. We also compute the Darcy permeability of the porous medium using the lattice-Boltzmann method. All the computations are carried out with a three-dimensional image of a core sample from Mt. Simon sandstone, the target porous formation for a pilot CO2 sequestration project that is currently being carried out by Illinois State Geological Survey. Thus, no assumptions are made regarding the shape and sizes of the pore throats and pore bodies. The computed CO2 sorption isotherm at 195 K is in excellent agreement with our experimental data. The computed permeability is also in good agreement with the measurement. As a further test we also compute the sorption isotherm of N2 in the same formation at 77.3 K, and show that it is also in good agreement with our ex...Continue Reading

References

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Citations

Nov 22, 2020·The Journal of Chemical Physics·A L KolesnikovG Y Gor
Oct 20, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·A L KolesnikovG Y Gor

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Methods Mentioned

BETA
x-ray diffraction

Software Mentioned

Seg3D
Cleaver

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