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Gravitational trapping of carbon dioxide in deep sea sediments: Permeability, buoyancy, and geomechanical analysis
Author(s) -
Levine J. S.,
Matter J. M.,
Goldberg D.,
Cook A.,
Lackner K. S.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl031560
Subject(s) - geology , seafloor spreading , geothermal gradient , permeability (electromagnetism) , buoyancy , porosity , deep sea , trapping , carbon dioxide , pore water pressure , seabed , petrology , oceanography , geophysics , geotechnical engineering , ecology , physics , membrane , biology , quantum mechanics , genetics
Liquid carbon dioxide injected in deep‐sea sediments at km depths and near freezing temperatures is denser than surrounding pore water and will be trapped by gravitational forces. Storage capacity for CO 2 in such formations below the ocean floor is shown to vary with seafloor depth, geothermal gradient, porosity, and pore water salinity. The formation permeability, or the successful engineering of such permeability through hydraulic fracturing, will determine the capacity for gravitational trapping in deep‐sea geological formations. We conclude that most ocean sediments at appropriate depth will lack the required permeability and that conventional hydraulic fracturing would only be possible in carefully selected sites.