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Sinking CO₂ in Supercritical Reservoirs.

ABSTRACT: 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°C) 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.

SUBMITTER: Parisio F

PROVIDER: S-EPMC7780548 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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Sinking CO2 in Supercritical Reservoirs.

Parisio Francesco F Vilarrasa Victor V

Geophysical research letters 20201129 23

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 th ...[more]

PMID: 33424049

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