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- Title
Characterizing the Impact of Fractured Caprock Heterogeneity on Supercritical CO2 Injection.
- Authors
Hyman, Jeffrey D.; Jiménez-Martínez, Joaquin; Gable, Carl W.; Stauffer, Philip H.; Pawar, Rajesh J.
- Abstract
We present a set of multiphase flow simulations where supercritical CO 2 (scCO 2 ) displaces water at hydrostatic conditions within three-dimensional discrete fracture networks that represent paths for potential leakage through caprock above CO 2 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 scCO 2 through these caprock formations. In one scenario, intrinsic fracture permeabilities are varied stochastically within a fixed network structure. In another scenario, we generate multiple 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 scCO 2 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 .
- Subjects
SUPERCRITICAL carbon dioxide; MULTIPHASE flow; FLOW simulations; SURFACE area; HETEROGENEITY; POLYWATER
- Publication
Transport in Porous Media, 2020, Vol 131, Issue 3, p935
- ISSN
0169-3913
- Publication type
Article
- DOI
10.1007/s11242-019-01372-1