Reactive Transport Modeling of CO2-Brine–Rock Interaction on Long-Term CO2 Sequestration in Shihezi Formation

Carbon Capture and Storage (CCS) is attracting increasing scientific attention. Although experiments can explore the chemical process of CO2 sequestration, they are limited in time. geological storage will last hundreds thousands years, even much longer, so numerical simulation method used to conduct kinetic batch modeling reactive transport modeling. The geochemical tool—TOUGHREACT—is imitate CO2-brine–rock interactions at Shihezi Formation Ordos basin. mechanisms interaction their effects on reservoir discussed, especially change structure properties. K-feldspar albite dissolve as main primary minerals. However, calcite quartz first precipitate last. In addition, siderite ankerite also appear precipitation Mineral dissolution alter formation petrophysical parameters, such porosity permeability, which play significant roles environments. rate may be small, it an ideal way storage. Regardless what minerals precipitate, improve CO2. between rock brine with dissolved promote amount mineralization CO2, called mineral trapping, has a positive effect long-term feasibility