Research Article
Evaluation of CO2-Fluid-Rock Interaction in Enhanced Geothermal Systems: Field-Scale Geochemical Simulations
Table 3
Chemical composition and initial volume fractions of primary and secondary minerals for geochemical simulations of the St. John’s CO2 field site.
| Mineral | Chemical composition | Initial volume fraction of minerals |
| Primary | Quartz | SiO2 | 0.475 | Oligoclase | Na0.77Ca0.23Al1.23Si2.77O8 | 0.280 | K-Feldspar | KAlSi3O8 | 0.200 | | KFe3AlSi3O10(OH)2 | 0.0075 | | KAlMg3Si3O10(OH)2 | 0.0075 | Muscovite | KAl3Si3O10(OH)2 | 0.025 |
| Secondary | Calcite | CaCO3 | 0.0 | Magnesite | MgCO3 | 0.0 | Illite | (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] | 0.0 | Smectite | K0.04Ca0.5(Al2.8Fe0.53Mg0.7)(Si7.65Al0.35)O20(OH)4 | 0.0 | Kaolinite | Al2Si2O5(OH)4 | 0.0 | Chlorite | Mg2.5Fe2.5Al2Si3O10(OH)8 | 0.0 | Albite | NaAlSi3O8 | 0.0 | Hematite | Fe2O3 | 0.0 | Dolomite | CaMg(CO3)2 | 0.0 | Ankerite | CaMg0.3Fe0.7(CO3)2 | 0.0 | Dawsonite | NaAlCO3(OH)2 | 0.0 | Siderite | FeCO3 | 0.0 |
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Biotite is assumed as 50% of Annite and 50% of Phlogopite.
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