In Hungary the most abundant potential storage formations are saline aquifers with sandstone reservoir and clayey caprock. Present work is focused on the mineralogy of core samples and their expectable geochemical reactions for the effect of scCO2. From the potential reservoir rock samples thin sections were analyzed by optical microscopy as well as SEM-BSE. XRD measurements were also performed, and subsequently geochemical models were run (PHREEQC 3.0, LLNL database). The preliminary results of the model show dissolution of calcite and also plagioclase, K-feldspar, ankerite. Furthermore, intense dolomite, kaolinite precipitation and minor quartz formation is predicted. On the caprock samples XRD analysis has been carried out, which shows the most significant presence of quartz and muscovite in these samples. We found minor amounts of clinochlore, albite, kaolinite, microcline, illite, dolomite and calcite. The caprock samples have been micronized for batch reactions. The scCO2 treatments are going at 130 bar and 180 °C in simplified artificial pore water. The micronized caprock samples have about a 0.5 m2 g-1 specific surface area at the beginning of treatments. We experienced the increase of Na-, K- and Mg-ion concentration and the decrease of Ca-ion concentration in the solution for the effect of scCO2.


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