Sinking CO in Supercritical Reservoirs.

Geologic carbon storage is required for achieving negative CO emissions to deal with the climate crisis. The classical concept of CO storage consists in injecting CO in geological formations at depths greater than 800 m, where CO becomes a dense fluid, minimizing storage volume. Yet CO has a density lower than the resident brine and tends to float, challenging the widespread deployment of geologic carbon storage. Here, we propose for the first time to store CO in supercritical reservoirs to reduce the buoyancy-driven leakage risk. Supercritical reservoirs are found at drilling-reachable depth in volcanic areas, where high pressure ( > 21.8 MPa) and temperature ( > 374°C) imply CO is denser than water. We estimate that a CO storage capacity in the range of 50-500 Mt yr could be achieved for every 100 injection wells. Carbon storage in supercritical reservoirs is an appealing alternative to the traditional approach.