Abstract
Abstract We have been constructing a database named “Formation-water database” by accumulating chemical compositions of groundwater in deep aquifers in Japan. The study aims to evaluate potential for solubility trapping of deep groundwater for geological CO 2 storage in Japan. The formation water of reservoir depth is found to be generally dilute in composition; regional average values of TDS are at about 1/5 to 3/5 of the seawater. The dilute composition of deep groundwater indicates its high potential in CO 2 solubility trapping (in average, more than 90% solubility as compared to pure water).
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