In order to reduce CO2 emissions into the atmosphere, the geological storage by capturing from major stationary sources and injecting it into suitable deep rock formations provides a powerful way. The technologies concerning the sequestration of CO2 are relatively mature, even if some problems - related to environment, health, security, legal aspects and public acceptance - are still open. The sequestration, confinement and trapping of acid gas, share a large set of materials, both natural and engineered, and complex phenomena. For performance and safety purposes, the persistence of initial sealing function as to be ensured over time, as the cap rock (usually clay materials) and foreigner anthropogenic materials will undergo physicochemical interactions and may lead to irreversible transformations. The storage behaviour is an issue to be evaluated versus time ahead (100 – 1000 years), and the long-term reliability of confinement has to be anticipated with sufficient accuracy

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