Estimation of In-Situ Groundwater Conditions Based on Geochemical Equilibrium Simulations

Journal of Sustainable Development of Energy, Water and Environment Systems
Volume 2, Issue 1, pp 15-29
Toshiyuki Hokari1 , Teruki Iwatsuki2, Takanori Kunimaru2
1 Shimizu Corporation, Institute of Technology, Japan
2 Tono Geoscientific Research Unit, Japan Atomic Energy Agency, Japan

This paper presents a means of estimating in-situ groundwater pH and oxidation-redox potential (ORP), two very important parameters for species migration analysis in safety assessments for radioactive waste disposal or carbon dioxide sequestration. The method was applied to a pumping test in a deep borehole drilled in a tertiary formation in Japan for validation. The following application examples are presented: when applied to several other pumping tests at the same site, it could estimate distributions of the in-situ groundwater pH and ORP; applied to multiple points selected in the groundwater database of Japan, it could help estimate the in-situ redox reaction governing the groundwater conditions in some areas.

Keywords: Groundwater, Water conditions, In-situ, pH; Oxidation-redox potential (ORP), Geochemical calculation, Mineral-water interaction

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