Geologic carbon storage is required for achieving negative CO2 emissions
to deal with the climate crisis. The classical concept of CO2 storage
consists in injecting CO2 in geological formations at depths greater
than 800 m, where CO2 becomes a dense fluid, minimizing storage volume.
Yet, CO2 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 CO2 in supercritical reservoirs
to reduce the buoyancy-driven leakage risk. Supercritical reservoirs are
found at drilling-reachable depth in volcanic areas, where high pressure
(p>21.8 MPa) and temperature (T>374 ºC) imply
CO2 is denser than water. We estimate that a CO2 storage capacity in the
range of 50-500 Mt yr-1 could be achieved for every 100 injection wells.
Carbon storage in supercritical reservoirs is an appealing alternative
to the traditional approach.