Abstract
Abstract Threshold pressure P c th , a parameter controlling rock's sealing performance in cases of CO 2 geological sequestration, was studied in a supercritical CO 2 –water system under conditions of 1000 m depth. To provide a constraint to the variation range of rocks’ P c th , the correlation between P c th and permeability, k , was examined using sintered compacts composed of mono- and bi-dispersed spherical silica particles. The Knudsen number estimated for supercritical CO 2 at 1000 m depth indicated that CO 2 transmuted into a non-continuum at k P c th is applicable in this situation.
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