Batch-type laboratory reactivity experiments and mo delling of hydrogeochemical interactions of a granite-scCO2-water system were conducted at 100 °C and 10 MPa in order to evaluate the geochemical and mineralogical responses of the granite to long-term reaction. The laboratory reactivity tests were conducted for a to t l duration of 70 days, and the continued hydrogeochemical interactions for up to 210 days we re determined by geochemical simulations. The reacted granite powder and the res idual solutions were subjected to several analytical techniques, including inductively-couple d plasma optical emission spectrometry (ICP-OES), X-ray diffraction (XRD), scanning electr on microscopy (SEM) and pH measurements, in order to characterise the mineralo gic l interactions. | Turkish Journal of Earth Sciences 30 TÜ İ Research Article Harcourt granite scCO2 water interaction a laboratory study of reactivity and modelling of hydrogeochemical processes Badulla Liyanage AVANTHI ISAKA Ranjith Pathegama GAMAGE Received Accepted Published Online Final Version Abstract Key words 1. Introduction lume Ré et al. 2014 . The min AVANTHI ISAKA and GAMAGE Turkish J Earth Sci Figure 1. Strategy of CO2 sequestration in geothermal reservoirs modified after Ueda et al. 2005 . storage of CO2 in deep earth during energy extraction from calcite. Further the precipitation of aluminium silicates hot dry rocks. and calcium-aluminosilicates as secondary precipitants A significant part of research has been carried out confirms the fixation of CO2 in a hydrothermal system recently to investigate the water-rock interactions of CO2- with CO2 and granite Liu et al. 2003 . In addition it has based geothermal reservoirs. In order to simulate deep been identified that the effect of CO2 is quite small at geological conditions researchers have focused on the 350 C and hence moderate temperatures of 150 250 C injection of CO2 in the supercritical state into their have been pinpointed as favourable for the capture of CO2 experimental systems since the critical point is C Suto et al. 2007 . In addition a study by Ueda et al. and MPa Span and Wagner 1996 . Ré et al. 2014 2005 revealed that the calcium from granitic silicates conducted hydrothermal experiments to evaluate the can easily be removed as Ca CO3 CaSO4 or CO2 during CO2 geochemistry and the mineralogical response of granite sequestration in geothermal reservoirs. Moreover exposed to water with and without the presence of Remoroza et al. 2015 concluded that the increase in the supercritical CO2 sc CO2 at 250 C and 25 45 MPa. The H2O content of a CO2-rock hydrothermal system causes study reveals that metastable smectite precipitation takes increased mineral dissolution and the formation of pits place in .
