Capturing and storing CO₂Principle behind CO₂ injection

At the storage location, the liquid CO₂ is injected to a depth of about 1,000 metres. Because of the pressure at this depth, it is 500 times denser here than as a gas at the earth’s surface and therefore makes full use of the storage volume. Storage occurs either physically (CO₂ is prevented from escaping by the pressure and cap rock) or chemically (new mineral formation). Once the injection is completed, the expansion of the CO₂ underground is secured with anti-leak sealing (right-hand image) and continually monitored.