Evaluation of CO₂-Fluid-Rock Interaction in Enhanced Geothermal Systems: Field-Scale Geochemical Simulations

Table 4

Kinetic rate parameters of primary and secondary minerals and reactive surface area for the geochemical simulations of the St. John’s CO₂ research site.

Mineral	Neutral mechanism		Acid mechanism			Base mechanism			Reactive surface area
									(cm^2/g)
Primary
Quartz	−13.99	87.7	—	—	—	—	—	—	9.8
Oligoclase	−11.84	69.8	−9.67	65.0	0.457	—	—	—	9.8
K-feldspar	−12.41	38.0	−10.06	51.7	0.500	−21.2	94.1	−0.823	9.8
	−12.55	22.0	−9.84	22.0	0.525	—	—	—	9.8
Phlogopite	−12.40	29.0	—	—	—	—	—	—	9.8
Muscovite	−13.55	22.0	−11.85	22.0	0.370	−14.55	22.0	−0.220	151.6
Secondary
Calcite	−5.81	23.5	−0.30	14.4	1.000	—	—	—	9.8
Magnesite	−9.34	23.5	−6.38	14.4	1.000	—	—	—	9.8
	−13.55	22.0	−11.85	22.0	0.370	−14.55	22.0	−0.220	151.6
Smectite	−12.78	35.0	−10.98	23.6	0.340	−16.52	58.9	−0.400	151.6
Kaolinite	−13.16	22.2	−11.31	65.9	0.777	−17.05	17.9	−0.472	151.6
Chlorite	−12.52	88.0	−11.11	88.0	0.500	—	—	—	9.8
Albite	−12.56	69.8	−10.16	65.0	0.457	−15.6	71.0	−0.572	9.8
Hematite	−14.60	66.2	−9.39	66.2	1.000	—	—	—	9.8
Dolomite	−7.53	52.2	−3.19	36.1	0.500	−5.11	34.8	0.500	9.8
	−7.53	52.2	−3.19	36.1	0.500	−5.11	34.8	0.500	9.8
Dawsonite	−7.00	62.8	—	—	—	—	—	—	9.8
Siderite	−8.90	62.8	−3.19	36.1	0.500	—	—	—	9.8

Note. Kinetic rate parameters from Palandri and Kharaka [16]; log k: kinetic rate constant k at 25°C (mol/m²/s); : activation energy (KJ/mol); : power term with respect to H⁺; set to Biotite; set to Muscovite; set to Dolomite.