North Sea Offshore Saline Aquifers
Jurassic sandstones 1 000–2 500 m below seabed trap CO₂ under caprock. Sleipner (since ’96) and Snøhvit prove safe, long-term injection.
Capacity: 0.4 Gt CO₂
Readiness: High
Icelandic Basalt Carbonation (Carbfix)
Basalt at Þeistareykir and Hellisheiði reacts with CO₂-rich water, mineralizing >95% in <2 yrs. Scale-up to 0.05 Gt under development.
Capacity: 0.05 Gt CO₂
Readiness: Medium
Netherlands Depleted Gas Fields
Groningen, Schoonebeek and other fields offer proven seals, infrastructure and pipelines. Pilots are validating pressure management and monitoring.
Capacity: 0.15 Gt CO₂
Readiness: Emerging