| Title | Experimental and Theoretical Studies on CO2 Sequestration into Geothermal Fields |
|---|---|
| Authors | Ueda, A., Kato, K., Ohsumi, T., Yajima, T., Kaieda ,H., Ito, H., Savage, D., Metcalfe, R. and Takase, H. |
| Year | 2005 |
| Conference | World Geothermal Congress |
| Keywords | CO2 sequestration geothermal calcite |
| Abstract | Experiments on CO2-water-rock interaction at hydrothermal temperatures have been performed to investigate dissolution and precipitation phenomena, including Ca extraction from rocks that might occur during CO2 sequestration into geothermal fields. The rock samples, granodiorites from the Ogachi hot/dry rock field and labradorite, were reacted in distilled water with and without CO2 being present. The results indicate that Ca concentration in the solutions increases quickly within 2 days and become constant for 15 days. The concentration of Ca in the solutions reacted with CO2 is 50mg/L higher than those without CO2 (with N2 gas). These results indicate that Ca can be released from rocks (silicates) easily and might be removed as CaCO3 and/or CaSO4 during CO2 sequestration into geothermal fields. |