Modeling gas-rock-water interactions in carbon dioxide storage capacity assessment: a case study of Jurassic sandstones in Poland

This paper presents the results of the modeling of gas-rock-water interactions for reservoir formation of one of potential geological carbon dioxide storage sites in the Polish Lowlands (Chabowo Anticline). The modeling performed with the use of a geochemical simulator was preceded by mineralogic-petrographical and petrophysical analysis of sandstones sampled together with pore water at the depths of 856-857 and 1,240-1,241 m. The study focused on determining the changes in rock matrix and reservoir parameters that take place as a result of carbon dioxide injection, and on the assessment of the formation suitability for carbon dioxide storage. The results have shown that in the analyzed gas-rock-water systems, in the modeled period of 20,000 years, the minerals able to trap carbon dioxide are calcite and dolomite. Mineral-trapping capacity of carbon dioxide, calculated for the sandstones considered, equals to 9.19 and 12.0 kg per one cubic meter of the formation.