Numerical Investigation into the Impact of CO₂-Water-Rock Interactions on CO₂ Injectivity at the Shenhua CCS Demonstration Project, China

Table 2

Mineralogical compositions of the three formations, initial mineral volume fractions introduced in the model, and possible secondary mineral phases used in the simulations.

Mineral	Chemical composition	Volume fraction (%)
		Liujiagou	Shiqianfeng	Shihezi
Primary
Quartz	SiO2	27	65	66
K-feldspar	KAlSi3O8	14	9	—
Oligoclase	Ca0.2Na0.8Al1.2Si2.8O8	24	16	6
Calcite	CaCO3	—	3	3
Dolomite	CaMg(CO3)2	—	—	3
Illite	K0.6Mg0.25Al1.8(Al0.5Si3.5O10)(OH)2	17	4.5	18.5
Kaolinite	Al2Si2O5(OH)4	6	—	—
Chlorite	Mg2.5Fe2.5Al2Si3O10(OH)8	8.5	—	—
Na-smectite	Na0.290Mg0.26Al1.77Si3.97O10(OH)2	1.75	1.25	1.75
Ca-smectite	Ca0.145Mg0.26Al1.77Si3.97O10(OH)2	1.75	1.25	1.75
Total		100	100	100
Secondary:
Magnesite	MgCO3
Albite~low	NaAlSi3O8
Siderite	FeCO3
Ankerite	CaMg0.3Fe0.7(CO3)2
Dawsonite	NaAlCO3(OH)2
Hematite	Fe2O3
Halite	NaCl
Anhydrite	CaSO4