Impact of SO₂ on Alteration of Reservoir Rock with Ca-Deficient Conditions and Poor Buffering Capacity under a CO₂ Geologic Storage Condition

Table 3

Dissolution equations of minerals used in this study.

	Dissolution equations	(25°C)
Albite	NaAlSi3O8 + 4H^+ = Al^3+ + Na + H2O + 3SiO2
Anorthite	CaAl2(SiO4)2 + 8H^+ = Ca^2+ + 2Al^3+ + 2SiO2 + 4H2O
Clinochlore-14A	Mg5Al2Si3O10(OH)8 + 16H^+ = 2Al^3+ + 3SiO2 + 5Mg^2+ + 12H2O
Daphnite-14A	Fe5AlAlSi3O10(OH)8 + 16H^+ = 2Al^3+ + 3SiO2 + 5Fe^2+ + 12H2O
Illite	K0.6Mg0.25Al1.8Al0.5Si3.5O10(OH)2 + 8H^+ = 0.25Mg^2+ + 0.6K^+ + 2.3Al^3+ + 3.5SiO2 + 5H2O
Kaolinite	Al2Si2O5(OH)4 + 6H^+ = 2Al^3+ + 2SiO2 + 5H2O
K-feldspar	KAlSi3O8 + 4H^+ = Al^3+ + K^+ + 2H2O + 3SiO2
Montmorillonite-Mg	Mg.495Al1.67Si4O10(OH)2 + 6H^+ = 0.495Mg^2+ + 1.67Al^3+ + 4H2O + 4SiO2
Pyrite	FeS2 + H2O = 0.25H^+ + 0.25 + Fe^2+ + 1.75HS^-
Quartz	SiO2 = SiO2