Overburden
Seal
Sequestration
Formation
Geographically extensive
Low permeability and high capillary entry pressure
Stable and sealed faults and fractures
High mechanical strength
Deeper than 800 m
Not a source of drinking water (TDS>10,000 ppm)
Satisfactory permeability
Sufficient sequestration volume
Hydrologically isolated from drinking water
aquifers
Large with open boundaries