| Περίληψη: | This study investigates the capability and suitability of the South-East Mesohellenic Trough sandstone formations as a potential reservoir for CO2 storage in response to the emerging climate change issues, by promoting environmentally friendly mineral sequestration applications. For achieving this goal, sandstones were collected in order to evaluate their petrographic and mineral chemistry characteristics, their geochemical properties, as well as to examine their petrophysical and gas adsorption properties through tests. Various sandstones were tested and classified into three district groups. Their mineral classification and modal composition revealed specific crystal phases that hold the potential to react with injected CO2 and to develop newly formed minerals such as calcite, dolomite and clay mineral in stable state. Gas adsorption results seem to be more encouraging for for the some of the sandsone groups identified (Group I and II).. UCS, Ei and v testings revealed that they highly depend upon the participating mineral phases as well on other parameters such as their porosity values, textural features and participation of matrix material. All measured values are above those dictated by international standards to safely perform CO2 storage practices. Possibly the most promising site to be considered for pilot CO2 storage testings is that of Oxinia(Pent.) locality, since it additionally holds the geological advantage of being overlaid by an impermeable caprock formation. A third group of sandstones (Group III) from the Meteora site should not be considered for any CO2 storage scenarios due to their particular mineral composition (e.g. high amount of calcite, low modal participation of CO2 reactive mineral phases) but also taking into account the cultural heritage of Meteora that prohibits any such scenario.
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