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Table 5 Geochemical model for reaction of cement, sandstone and shale with CO2 and Na, Ca, Mg chloride brines.

From: Experimental Study of Cement - Sandstone/Shale - Brine - CO2Interactions

Cement Hydration
Phase Mass Balance Log K 95°C Log SI 95°C
Portlandite Ca(OH)2 + 2H+ Ca2+ + 2H2O 18.30 0.04 ± 0.04
Psuedowollastonite CaSiO3+ 2H+ SiO2 + Ca2+ + H2O 10.97 0.3 ± 1.3
Brucite Mg(OH)2 + 2H+ Mg2+ + 2H2O 12.65 0.7 ± 0.1
1Hydrotalcite Mg4Al2 O7(OH)2:10H2O + 14H+ 2Al3+ + 4Mg2+ + 17H2O 53.67 2.8 ± 0.2
1Fe-Hydrogarnet Ca3Fe2(OH)12 + 12H+ 3Ca2+ + 2Fe3+ + 12H2O 68.50 -3.4 ± 2.7
Anhydrite CaSO4 Ca2+ + SO42- -5.08 -0.3 ± 0.1
Cement, Sandstone, and Shale Carbonation
Phase Mass Balance Log K 95°C
Albite NaAlSi3O8 + 4H+ Al3+ + Na+ + 2H2O + 3SiO2 0.46
1Amorphous Al(OH)3 Al(OH)3 +3H+ Al3+ + 3H2O 5.42
1Amorphous Fe(OH) 3 Fe(OH)3 +3H+ Fe3+ + 3H2O 2.86
Boehmite AlO(OH) + 3H+ Al3+ + 2H2O 3.75
Calcite CaCO3 + H+ Ca2+ + HCO3- 0.85
Chalcedony SiO2 SiO2,aq -2.88
Dolomite CaMg(CO3)2 + 2H+ Ca2+ + Mg2+ + 2HCO3- 1.41
Ripedolite 14Å Mg3Fe2Al2Si3O10(OH)8 +16 H+ 2Al3+ + 3SiO2,aq + 3Mg2+ + 2Fe2+ + 12H2O 41.45
Illite K 0.6Mg0.25 Al2.3Si3.5O10(OH)2 + 8H+ 0.25Mg2+ + 0.6K+ + 2.3Al3+ + 3.5SiO2 + 5H2O 2.56
Kaolinite Al2Si2O5(OH)4 + 6 H+ 2 Al3+ + 2 SiO2 + 5 H2O 1.35
Magnesite MgCO3 + H+ Mg2+ + HCO3- 0.71
Quartz SiO2 SiO2,aq -3.10
Siderite FeCO3 + H+ Fe2+ + HCO3- -1.40
Smectite (Ca-Beidellite) Ca0.165Al2.33Si3.67O10(OH)2 + 7.32H+ + 0.165Ca2+ + 2.33Al3+ + 4.66H2O + 3.67SiO2 -0.62
  1. Unless otherwise noted the values are estimated from SUPCRT92 [35]; 1 values from CEMDATA [36].