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

Table 5

The changes in abundance of mineral dissolution and precipitation after 10,000 years.

Minerals modelled	Chemical composition	Mineral dissolution (↑) and precipitation (↓)
		Liujiagou		Shiqianfeng		Shihezi
		−5 m	−55 m	−5 m	−55 m	−5 m	−55 m
Primary minerals
Quartz	SiO2	↓	↓	↓	↓	↓	↓
K-feldspar	KAlSi3O8	↓	↑	↓	↑	↓	↓
Oligoclase	Ca0.2Na0.8Al1.2Si2.8O8	↑	↑	↑	↑	↑	↑
Illite	K0.6Mg0.25Al1.8(Al0.5Si3.5O10)(OH)2	↑	↓	↑	↓	↓	↓
Kaolinite	Al2Si2O5(OH)4	↑	↓	↓	↓	/	/
Chlorite	Mg2.5Fe2.5Al2Si3O10(OH)8	↑	↑	/	/	/	/
Smectite-Na	Na0.290Mg0.26Al1.77Si3.97O10(OH)2	↓	↓	↓	↓	↓	↓
Smectite-Ca	Ca0.145Mg0.26Al1.77Si3.97O10(OH)2	↑	↑	↑	↑	↑	↑
Calcite	CaCO3	↓0.83%	↓0.84%	↓0.81%	↓0.79%	↓1.68%	↓1.69%
Dolomite	CaMg(CO3)2	/	/	/	/	↑	↑
Secondary minerals
Albite	NaAlSi3O8	↓	↓	↓	↓	↑	↑
Ankerite	CaMg0.3Fe0.7(CO3)2	/	/	/	/	/	/
Dawsonite	NaAlCO3(OH)2	↓1.30%	/	↓2.35%	↓0.43%	↓1.42%	↓1.15%
Siderite	FeCO3	↓0.45%	↓0.16%	/	/	/	/
Magnesite	MgCO3	/	/	/	/	↓0.04%	↓0.03%

Note. ↓ represents mineral precipitation; ↑ represents mineral dissolution; represents nonexistent; data beside and is the volume fraction changes of minerals.