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Physical property changes of sandstones in Korea derived from the supercritical CO2-sandstone-groundwater geochemical reaction under CO2 sequestration condition

  • Park, Jinyoung (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Baek, Kyoungbae (Department of Earth Environmental Sciences, Pukyong National University) ;
  • Lee, Minhee (Department of Earth Environmental Sciences, Pukyong National University) ;
  • Wang, Sookyun (Department of Energy Resources Engineering, Pukyong National University)
  • Received : 2013.04.09
  • Accepted : 2014.07.07
  • Published : 2015.06.30

Abstract

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 $CO_2$ under sequestration conditions. To simulate the sub-surface storage condition (100 bar and $50^{\circ}C$), the high pressurized stainless cell and chamber were used and the supercritical $CO_2$ 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 $CO_2$-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 $CO_2$ 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 ($K_1$) of sandstones, calculated by using the loss of sandstone mass during the reaction time was $0.0000846day^{-1}$. The $K_1$ values will be useful for estimating the dissolution process of sandstones originated from the supercritical $CO_2$-sandstone-groundwater reaction while the $CO_2$ was injected into the sub-surface.

Keywords

Acknowledgement

Supported by : Korea CCS R&D Center (KCRC)

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