The Influence of Water Saturation on Permeability of Low-permeability Sandstone

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• 作者：Yan Zhao^a ; Lu Xia^a ; Qian Zhang^b ; Qingchun Yu^a ; ^{yuqch@cugb.edu.cn}
• 关键词：sequestration ; supercritical CO2 ; breakthrough pressure ; absolute permeability ; effective permeability
• 刊名：Procedia Earth and Planetary Science
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：17
• 期：Complete
• 页码：861-864
• 全文大小：202 K
• 卷排序：17

文摘

Sequestration of CO2 in a suitable geological repository is a function of permeability, which is affected by water saturation, pressure and temperature. In this study, breakthrough experiments using CO2 were conducted on three sandstone cores, using varying degrees of water saturation at 40°C and pressures of >8 MPa. Results show that absolute CO2 permeability decreases significantly with increasing temperature and pressure, and increasing the degree of water saturation in the cores leads to an increase in gas breakthrough pressure. Also, higher water saturation and breakthrough pressure resulted in a decrease in the scCO2 effective permeability.