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 | |