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Appl. Sci. 2017, 7(6), 572; doi:10.3390/app7060572

The Use of the Surface Roughness Value to Quantify the Extent of Supercritical CO2 Involved Geochemical Reaction at a CO2 Sequestration Site

1
Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea
2
Department of Earth Environmental Sciences, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Korea
3
Department of Architectural Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Korea
4
Department of Energy Resources Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Jose Augusto Paixao Coelho
Received: 21 April 2017 / Revised: 18 May 2017 / Accepted: 22 May 2017 / Published: 2 June 2017
(This article belongs to the Special Issue The Applications of Supercritical Carbon Dioxide)
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Abstract

Changes in the physical properties of the supercritical CO2 (scCO2) reservoir rock is one of the most important factors in controlling the storage safety at a scCO2 sequestration site. According to recent studies, it is probable that geochemical reactions influence changes in the rock properties after a CO2 injection in the subsurface, but quantitative data that reveal the interrelationship of the factors involved and the parameters needed to evaluate the extent of scCO2-rock-groundwater reactions have not yet been presented. In this study, the potential for employing the surface roughness value (SRRMS) to quantify the extent of the scCO2 involved reaction was evaluated by lab-scale experiments. For a total of 150 days of a simulation of the scCO2-sandstone-groundwater reaction at 100 bar and 50 °C, the trends in changes in the physical rock properties, pH change, and cation concentration change followed similar logarithmic patterns that were significantly correlated with the logarithmic increase in the SRRMS value. These findings suggest that changes in surface roughness can quantify the extent of the geochemical weathering process and can be used to evaluate leakage safety due to the progressive changes in rock properties at scCO2 storage sites. View Full-Text
Keywords: CO2 sequestration; CO2 reservoir rock; leakage safety; scCO2-water-rock reaction; surface roughness value; supercritical CO2 CO2 sequestration; CO2 reservoir rock; leakage safety; scCO2-water-rock reaction; surface roughness value; supercritical CO2
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Park, J.; Baek, K.; Lee, M.; Chung, C.-W.; Wang, S. The Use of the Surface Roughness Value to Quantify the Extent of Supercritical CO2 Involved Geochemical Reaction at a CO2 Sequestration Site. Appl. Sci. 2017, 7, 572.

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