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.