Pore-scale simulation of miscible viscous fingering with dissolution reaction in porous media

Global climate change is happening but may be mitigated by the technology of geological carbon dioxide ( CO 2) sequestration. To gain comprehensive insights into this approach, we perform pore-scale simulations displacement between two miscible fluids in porous media using a new multiple-relaxation-time lattice Boltzmann model. This study marks first attempt to investigate viscous fingering dynamics displacement, considering coexistence viscosity contrast and dissolution reaction. Simulation results capture different patterns that depend on (Damköhler number Da), diffusion (Peclet Pe), (viscosity ratio R). From unstable flows, found delay onset, slow down propagation, inhibit or reinforce late-stage intensity. In with stable contrasts, features phenomena when fast enough. addition, conduct parametric assess impact Pe, R, Da. The suggest increasing Pe R destabilizes fingering, Da suppresses gradually intensifies fingering. Finally, for every fixed Da, determine phase boundary regimes Pe–R plane. A unified scaling law developed approximate lines obtained under values. By comparing reactive nonreactive cases, classify four distinct regimes: stable, unstable, unstable. These are helpful understanding predicting stability during 2 sequestration, which importance pre-evaluation storage efficiency safety.