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Characterizing the Impact of Fractured Caprock Heterogeneity on Supercritical CO2 Injection
- Journal Article
We present a set of multiphase flow simulations where supercritical CO2 (scCO2) displaces water at hydrostatic conditions within three-dimensional discrete fracture networks that represent paths for potential leakage through caprock above CO2 storage reservoirs. The simulations are performed to characterize and compare the relative impact of hydraulic and structural heterogeneity in fractured media on the initial movement of scCO2 through these caprock formations. In one scenario, intrinsic fracture permeabilities are varied stochastically within a fixed network structure. In another scenario, we generatemultiple independent, identically distributed network realizations with varying fracture network densities to explore a wide range of geometric and topological configurations. Analysis of the simulations indicates that network structure, specifically connectivity and the presence of hanging fractures, plays a larger role in controlling the displacement of water by scCO2 than variations in local hydraulic properties. We identify active surface area of the network as a single-phase feature that could provide a lower bound on the percentage of the network surface area reached by scCO(2). Show more
Journal / seriesTransport in Porous Media
Pages / Article No.
SubjectDiscrete fracture networks; Multiphase flow; Active surface area; Carbon sequestration; Fractured porous media
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