Research Article
A Geochemical Model of Fluids and Mineral Interactions for Deep Hydrocarbon Reservoirs
(a) Ions, minerals, and gases involved in CO2-CH4-brine-carbonate systems |
| Cations | Anions | Neutral ions | Minerals and gases |
| H+ | OH− | H2O | Aragonite | Ca2+ | | CH4 | Calcite | | | CO2 | Dolomite | CaOH+ | Cl− | (CO2)2 | Halite | Mg2+ | | CaCO3 | CH4 (g) | | | H2 | CO2 (g) | MgOH+ | | MgCO3 | H2 (g) | Na+ | | NaHCO3 | H2O (g) | | | NaOH | O2 (g) | | | O2 | |
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(b) Ions, minerals, and gases involved in CO2-CH4-brine-sulfate systems |
| Cations | Anions | Neutral ions | Minerals and gases |
| H+ | OH− | H2O | Anhydrite | Ba2+ | | BaSO4 | Aragonite | | | BaCO3 | Barite | BaOH+ | | NaHCO3 | Calcite | | Cl− | CaCO3 | Dolomite | | | (CO2)2 | Gypsum | Ca2+ | HS− | MgCO3 | Halite | | S2− | CaSO4 | Sulfur | CaOH+ | | MgSO4 | Witherite | Mg2+ | | NaOH | H2 (g) | MgOH+ | | O2 | H2O (g) | Na+ | | H2S | H2S (g) | | | H2 | O2 (g) | | | CH4 | CH4 (g) | | | CO2 | CO2 (g) |
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