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http://dx.doi.org/10.9719/EEG.2013.46.3.221

Study on the Geochemical Weathering Process of Sandstones and Mudstones in Pohang Basin at CO2 Storage Condition  

Park, Jinyoung (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources)
Lee, Minhee (Department of Earth Environmental Sciences, Pukyong National University)
Wang, Sookyun (Department of Energy Resources Engineering, Pukyong National University)
Publication Information
Economic and Environmental Geology / v.46, no.3, 2013 , pp. 221-234 More about this Journal
Abstract
Laboratory experiments for the reaction with supercritical $CO_2$ under the $CO_2$ sequestration condition were performed to investigate the mineralogical and geochemical weathering process of the sandstones and mudstones in the Pohang basin. To simulate the supercritical $CO_2$-rock-groundwater reaction, rock samples used in the experiment were pulverized and the high pressurized cell (200 ml of capacity) was filled with 100 ml of groundwater and 30 g of powdered rock samples. The void space of the high pressurized cell was saturated with the supercritical $CO_2$ and maintained at 100 bar and $50^{\circ}C$ for 60 days. The changes of mineralogical and geochemical properties of rocks were measured by using XRD (X-Ray Diffractometer) and BET (Brunauer-Emmett-Teller). Concentrations of dissolved cations in groundwater were also measured for 60 days of the supercritical $CO_2$-rock-groundwater reaction. Results of XRD analyses indicated that the proportion of plagioclase and K-feldspar in the sandstone decreased and the proportion of illite, pyrite and smectite increased during the reaction. In the case of mudstone, the proportion of illite and kaolinite and cabonate-fluorapatite increased during the reaction. Concentration of $Ca^{2+}$ and $Na^+$ dissolved in groundwater increased during the reaction, suggesting that calcite and feldspars of the sandstone and mudstone would be significantly dissolved when it contacts with supercritical $CO_2$ and groundwater at $CO_2$ sequestration sites in Pohang basin. The average specific surface area of sandstone and mudstone using BET analysis increased from $27.3m^2/g$ and $19.6m^2/g$ to $28.6m^2/g$ and $26.6m^2/g$, respectively, and the average size of micro scale void spaces for the sandstone and mudstone decreased over 60 days reaction, resulting in the increase of micro pore spaces of rocks by the dissolution. Results suggested that the injection of supercritical $CO_2$ in Pohang basin would affect the physical property change of rocks and also $CO_2$ storage capacity in Pohang basin.
Keywords
$CO_2$ injection; $CO_2$ sequestration; supercritical $CO_2$; Pohang basin; geochemical weathering;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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