Abstract
Global CO2 storage capacity of saline aquifers is much greater than other alternative reservoirs, but suitability of a potential site must be investigated carefully. Saline aquifers that have sandstone as reservoir rock at a depth greater than 800 m below the ground surface are ideal reservoirs for injection and storage of CO2, provided a good cap-rock exists to act as the seal. The geochemical maturity and geomechanical characteristics of the reservoirs are of prime importance. Highly mineralized brine present in a typical saline aquifer has been found to enhance the process of mineral trapping of CO2 through rock-brine-CO2 interaction. The challenge though is that CO2 thus stored, should not escape or leak from the reservoir under any circumstance. In this chapter, a comprehensive study of various CO2 trapping mechanisms in a saline aquifer is presented. A brief review of previous works is also presented to highlight the immense storage potential of the suitable aquifers. Injected CO2 in such a reservoir may be stored as structural/stratigraphic trapping, diffusion/solubility trapping, residual trapping, and mineral trapping/ mineralization.
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Shukla Potdar, R., Vishal, V. (2016). Trapping Mechanism of CO2 Storage in Deep Saline Aquifers: Brief Review. In: Vishal, V., Singh, T. (eds) Geologic Carbon Sequestration. Springer, Cham. https://doi.org/10.1007/978-3-319-27019-7_3
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DOI: https://doi.org/10.1007/978-3-319-27019-7_3
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