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Effect of supercritical CO2as the organic solvent on cap rock sealing performance for underground storage

Authors
Journal
Energy
0360-5442
Publisher
Elsevier
Publication Date
Volume
30
Identifiers
DOI: 10.1016/j.energy.2003.10.025

Abstract

Abstract Supercritical CO 2 fluid is capable of extracting organic matter from rocks. Although the sealing performance of cap rock is essential for CO 2 underground storage, typical cap rock such as shale or mudstone usually contains organic matter. To determine how well cap rocks can seal supercritical CO 2, cap rock samples from the Nagaoka injection test site were treated with supercritical CO 2, and then the porosity and pore radius distribution of the samples were measured by mercury porosimetry. The results showed that the pore radius distributions slightly shifted to a larger size after treatment, while the porosity and permeability changed less than 1%.

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