WYKORZYSTANIE CHEMIZMU WÓD GŁĘBOKICH POZIOMÓW WODONOŚNYCH NIŻU POLSKIEGO NA WSTĘPNYM ETAPIE OCENY ICH PRZYDATNOŚCI DO LOKOWANIA DWUTLENKU WĘGLA

Abstract

THE USE OF CHEMISTRY OF DEEP AQUIFERS IN THE POLISH LOWLANDS AS AN INDICATOR OF THEIR SUITABILITY FOR STORAGE OF CARBON DIOXIDE IN THE PRELIMINARY STUDIESAbstract. A detailed study of site hydrogeology, hydraulic properties of formations, and identification of all potential leakage pathways must be performed during an analysis of suitability for carbon dioxide storage. Prior these investigations, a preliminary hydrogeochemical analysts might be carried out, based on investigations of the geochemical maturity of groundwater and isolation of aquifers, measured by TDS, Na/Cl arid Cl/Br ratios. Six types of groundwater, according to the degree of geochemical maturity and isolation, have been identified in the Polish Lowlands; from the modem freshwaters that contact with meteoric waters (types 1 and 2), to the oldest, stagnant, highly mineralized brines (types 5 and 6). The Carboniferous, Permian, Triasslc and Jurassic aquifers, between 290 and 4907 m depth, contain waters of 0.5-458.4 g/l TDS. The geochemical maturity of waters depends on the depth, presence of impermeable caprock, distance from the outcrops and presence of faults and fractures. The waters in the Jurassic reservoirs are of different types, from types 1 and 2, which are not suitable for CO2 storage, to types 3 and 4, which are more suitable. The Triassic reservoirs are mostly of types 4 and 6, which are more suitable for CO2 storage. The most suitable for CO2 storage are the Permian aquifers of types 4 to 6.