Subsurface Fluid Injection and Energy Storage
Open Access

Table 6

Initial mineral volume fractions and possible secondary mineral phases used in the simulations [31].

Mineral classification Mineral name Chemical composition Reservoirs (volume fraction) Caprock (volume fraction)
Clay minerals Illite K0.6Mg0.25Al1.8(Al0.5Si3.5O10)(OH)2 0.15 0.653
Kaolinite Al2Si2O5(OH) 0.03 0.0111
Smectite-Ca Ca0.145Mg0.26Al1.77Si3.97O10(OH)2 0 0.0696
Chlorite Mg2.5Fe2.5Al2Si3O10(OH)8 0.10 0.064
Non-clay mineral Quartz SiO2 0.35 0.08
K-feldspar KAlSi3O8 0.20 0.028
Albite NaAlSi3O8 0 0.032
Anhydrite CaSO4 0 0.04
Calcite CaCO3 0.10 0.008
Pyrite FeS2 0 0.004
Oligoclase CaNa4Al6Si14O40 0.05 0
Hematite Fe2O3 0.005 0
Siderite FeCO3 0 0
Ankerite CaMg0.3Fe0.7(CO3)2 0 0
Dawsonite NaAlCO3(OH)2 0 0
Magnesite MgCO3 0 0
Dolomite CaMg(CO3)2 0 0
Halite NaCl 0 0

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