Simulation and Analysis of Long-Term CO₂ Trapping for the Shenhua CCS Demonstration Project in the Ordos Basin

Table 1

Mineral composition of formations [25–27] and possible secondary minerals used in the simulations.

Minerals of formations	Mineral modelled	Chemical composition	Volume fraction (vol.%)
			Liujiagou	Shiqianfeng	Shihezi
Primary minerals
Quartz	Quartz	SiO2	27	65	66
Alkali-feldspar	K-feldspar	KAlSi3O8	14	9	0
Plagioclase	Oligoclase	Ca0.2Na0.8Al1.2Si2.8O8	24	16	6
Illite	Illite	K0.6Mg0.25Al1.8(Al0.5Si3.5O10)(OH)2	17	4.5	18.5
Kaolinite	Kaolinite	Al2Si2O5(OH)4	6	0	0
Chlorite	Chlorite	Mg2.5Fe2.5Al2Si3O10(OH)8	8.5	0	0
Smectite	Smectite-Na	Na0.290Mg0.26Al1.77Si3.97O10(OH)2	1.75	1.25	1.75
	Smectite-Ca	Ca0.145Mg0.26Al1.77Si3.97O10(OH)2	1.75	1.25	1.75
Calcite	Calcite	CaCO3	0	3	3
Dolomite	Dolomite	CaMg(CO3)2	0	0	3
Secondary minerals
	Magnesite	MgCO3
	Albite	NaAlSi3O8
	Siderite	FeCO3
	Ankerite	CaMg0.3Fe0.7(CO3)2
	Dawsonite	NaAlCO3(OH)2
	Hematite	Fe2O3
	Halite	NaCl
	Anhydrite	CaSO4