A numerical simulation model was developed to simulate flow profiles and fluid flow in COMSOL Multiphysics. In this studies laminar flow models was developed to explicitly quantify the flow behavior of CO2 gas through dual solid media (coal matrix and fracture). Although CO2-enhanced coal bed methane (ECBM) recovery has been comprehensively investigated, the impact of coal matrix-fracture interactions on the evolution of coal permeability under in-situ conditions is still unclear. Due to post-lithogenetic fracturing or weathering, coal matrix can contain complex dual porosity structure, which makes it difficult to identify the fluid flow behavior through it. A study on the control exerted by fracture and fault networks on fluid flow, and in particular on CO2 leakage, should be based upon a representation of discrete fracture networks (DFN) that is as close as possible to that observed in the field. Carbon capture and storage (CCS) projects require an accurate evaluation of the sealing potential of faults and highly fractured zones to minimize the potential for CO2 leakage.
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