Capillary seals for trapping carbon dioxide (CO2) in underground reservoirs
T.A. Meckel, The University of Texas at Austin, USA
Pore -scale capillary processes within geologic reservoirs and seals influence buoyancy-driven fluid migration. This chapter reviews these processes and considers their relevance to CO2 sequestration. The ability of membrane seals in water/brine -wet rocks to retard buoyant fluid migration (including CO2) relates to the capillary pressures and pore throat diameters of the seal rock. An attempt is made here to calculate anticipated ambient capillary pressures in the lowest portions of the seal, using existing laboratory data on the petrophysical properties of the CO2-brine-reservoir system as the basis ...