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Effect of in-situ Stress Alterations on Flow through Faults and Fractures in the Cap Rock

Author: Antropov, A. · Lavrov, A. · Orlic, B.
Type:article
Date:2017
Publisher: Elsevier Ltd
Source:Energy Procedia, Dixon, T.Laloui, L.Twinning, S., 13th International Conference on Greenhouse Gas Control Technologies, GHGT 2016. 14 November 2016 through 18 November 2016, 114, 3193-3201
Identifier: 781350
doi: doi:10.1016/j.egypro.2017.03.1449
Keywords: Geosciences · Cap rock · CO2 · Coupled model · Fracture · Geomechanics · Leakage · Permeability · Geological Survey Netherlands · 2015 Energy · 2017 Geo · AG - Applied Geosciences · ELSS - Earth, Life and Social Sciences

Abstract

Cap-rock integrity is of paramount importance during injection and subsequent long-term storage of CO2 in the subsurface. Preexisting (natural) and man-induced fractures in the cap rock represent potential flow paths out of the storage formation. In this study, a first-order semi-analytical model of flow through a vertical fracture penetrating cap rock is constructed taking the stressdependent fracture permeability into account. The model is then applied to study the effects of in-situ stress normal to fracture on the flow rate through the fracture. The flow rate increases nonlinearly with the reservoir pressure, which is due to a combined effect of nonlinear fracture deformation law and the cubic law governing the flow rate.