piégeage physique

CONT: Le piégeage physique, qui bloque la remontée du CO[indice 2], est assuré par une couche de schiste argileux, appelée chapeau ou couverture, située au-dessus du réservoir. Les forces capillaires qui retiennent le gaz dans les espaces interstitiels de la formation peuvent aussi contribuer au piégeage physique.

CONT: It is considered that in a suitable storage site, CO[subscript 2] will be stored by physical or geochemical trapping or a combination of both. Physical trapping includes: stratigraphic trapping, when the CO[subscript 2] is held below a low-permeability seal (cap rock); structural trapping, where CO[subscript 2] is trapped by physical structures such as those formed by faults and folds of the rock; or hydrodynamic trapping in saline formations, where fluids migrate very slowly and the buoyant CO[subscript 2] migrates upwards to the top of the formation.