| Abstract |
This work focuses on microscale transport behavior of binary mixtures in the context of CO2 and H2 storage in shale gas formations. To this end, a multiple relaxation time lattice Boltzmann (LB) model is implemented to simulate microscale transport behavior. In the LB model, a combined boundary scheme of bounce-back and specular reflection is used to model fluid-wall interactions and slippage effect, and a regularization algorithm is used to obtain accurate solutions for complex geometries. The binary LB model is validated using the Kramer problem and pseudobinary flows in slit and irregular nanopores. Subsequently, pressure-driven flows of CH4−CO2 and CH4−H2 binary mixtures are investigated in slit nanopores and irregular porous media under various pressure and composition conditions. The impact of simulation conditions on fluid velocity, mass flux, apparent permeability, Péclet number, and pressure drop is comprehensively examined. The dynamics of CO2 and H2 displacing CH4 in nanoconfined spaces are studied. The results point to different displacement mechanisms between CO2 and H2 due to their different molecular properties. In summary, this work provides deep insights relevant to subsurface storage of CO2 and H2 in shale gas reservoirs. |
, Saman A. Aryana 
