Table 2 Key geological indicators for storage-site suitability (Chadwick et al., 2008)
From: Potential for deep geological sequestration of CO2 in Switzerland: a first appraisal
Storage capacity | Positive indicators | Cautionary indicators |
|---|---|---|
Total storage capacity | Total capacity of reservoir estimated to be much larger than the total amount produced from the CO2 source | Total capacity of reservoir estimated to be similar to or less than the total amount produced from the CO2 source |
Reservoir properties | ||
 Depth (pressure) | 1,000–2,500 m | <800 m or >2,500 m |
 Thickness (net) | >50 m | <20 m |
 Porosity | >20% | <10% |
 Permeability | >300 mD | <10–100 mD |
 Salinity | >100 g L−1 | <30 g L−1 |
Caprock properties | ||
 Lateral continuity | Unfaulted | Laterally variable, faults |
 Thickness | >100 m | <20 m |
 Capillary entry pressure | Much greater than buoyancy force of maximum predicted CO2 column height | Similar to buoyancy force of maximum predicted CO2 column height |