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Two phase (water and supercritical CO2) residence times close to and further away from injectors depend on heterogeneous flow fields and mineral reactions. Residence times are here shown to be sufficiently long for fast reactions like carbonate dissolution or salt precipitation to occur fairly close to the injection well, while slower reactions like silicate dissolution may be sufficiently fast only in far-field locations. Significant poroperm changes in the near-well area are thus only likely to be observed in sediments with a considerable carbonate content, and in sediments with very saline formation waters. Sufficient proton comsumption for pressure dissipation will only occur at a considerable distance from the injection point, but since pressure transfer is fast, mineral induced pressure dissipation is likely to affect injection rate in storages with a significant content of immature mineral components. CO2 storage filling patterns will thus rely on both fast and slow reactions. The impact of fast reactions is to modify porosity and permeability in the near-well zone, while slow reactions in the far-field zone have an influence on injectivity and flow directions through their feedback on CO2 partial pressure, and they may be important pressure reducers

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Temporal and spatial scale for mineral reactions in the nearwell zone of CO2 injectors — Implications for flow paths, storage filling pattern, pressure dissipation and leakage risk