Carbon sequestration

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Carbon sequestration refers to ways and methods by which the carbon dioxide is trapped and stored into the geological reservoirs. During underground CO2 storage operations in deep reservoirs, the CO2 can be trapped in three main ways (Bachu et al., 1994): as ‘free’ CO2, most likely as a supercritical phase (physical trapping) dissolved in formation water (hydrodynamic trapping) precipitated in carbonate phases such as calcite (mineral trapping)