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자료유형
학술저널
저자정보
박진영 (한국지질자원연구원 석유해저연구본부) 백경배 (부경대학교) 이민희 (부경대학교) 왕수균 (부경대학교)
저널정보
한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.19 No.2
발행연도
2015.1
수록면
313 - 324 (12page)

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Laboratory experiments and calculation of the dissolution constant were performed to investigate the physical property changes of sandstones in Korea resulting from the geochemical reaction of CO2 under sequestration conditions. To simulate the sub-surface storage condition (100 bar and 50 °C), the high pressurized stainless cell and chamber were used and the supercritical CO2 fluid was injected into the cell (or the chamber) by the syringe pump and the pressure regulator. Sandstone slabs and cores were used for the experiments of the supercritical CO2-sandstone‒groundwater reaction. Results of SEM/EDS and SPM analyses showed that the surface roughness of the slab increased and the precipitation of calcite, halite, and Ca-rich silicate minerals on the sandstone slab occurred during 60 days reaction, suggesting the geochemical weathering process, as a result of CO2 injection, directly leads to property changes of sandstones in a short time. The average porosity of sandstone cores as increased 8.8% with the corresponding decreases in the dry density, P and S wave velocity, dynamic Young’s modulus, and the uniaxial compression strength, indicating that the trend of property changes for the sandstone was well fitted to the first-order reaction curve. The average first-order dissolution constant (K1) of sandstones, calculated by using the loss of sandstone mass during the reaction time was 0.0000846 day‒1. The K1 values will be useful for estimating the dissolution process of sandstones originated from the supercritical CO2-sandstone‒groundwater reaction while the CO2 was injected into the sub-surface.

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