A Geochemical Model of Fluids and Mineral Interactions for Deep Hydrocarbon Reservoirs

Table 5

(a) Ions, minerals, and gases involved in CO₂-CH₄-brine-carbonate systems

Cations	Anions	Neutral ions	Minerals and gases
H^+	OH^−	H2O	Aragonite
Ca^2+		CH4	Calcite
		CO2	Dolomite
CaOH^+	Cl^−	(CO2)2	Halite
Mg^2+		CaCO3	CH4 (g)
		H2	CO2 (g)
MgOH^+		MgCO3	H2 (g)
Na^+		NaHCO3	H2O (g)
		NaOH	O2 (g)
		O2

(b) Ions, minerals, and gases involved in CO₂-CH₄-brine-sulfate systems

Cations	Anions	Neutral ions	Minerals and gases
H^+	OH^−	H2O	Anhydrite
Ba^2+		BaSO4	Aragonite
		BaCO3	Barite
BaOH^+		NaHCO3	Calcite
	Cl^−	CaCO3	Dolomite
		(CO2)2	Gypsum
Ca^2+	HS^−	MgCO3	Halite
	S^2−	CaSO4	Sulfur
CaOH^+		MgSO4	Witherite
Mg^2+		NaOH	H2 (g)
MgOH^+		O2	H2O (g)
Na^+		H2S	H2S (g)
		H2	O2 (g)
		CH4	CH4 (g)
		CO2	CO2 (g)