Abstract
Three methodological considerations critical to the use of mercury porosimetry for reservoir characterization are the analytical pressure ranges which should be covered, sampling density, and the effects of variation in sample weight. Of these, the analytical pressure range is most likely to be inappropriately scaled. Mercury porosimetry analyses should be carried out to very high pressures for two reasons: first, although mercury-air capillary pressure corresponding to subsurface conditions at a given depth varies greatly depending on fluid densities, viscosities, and interfacial tensions, and on rock wettability, hydrostatic gradients yield capillary pressures equivalent to 10,000 PSIA (Hg-air) at 4,600 feet (1.4 km) or less. To evaluate the range of conditions likely to be encountered at subsurface depths where hydrocarbon production is economically feasible, mercury porosimetry should attain pressures of at least 10,000 PSIA. Second, substantial amounts of mercury intrusion occur at capillary pressures greater than 10,000 PSIA (Hg-air): up to 41% in the studied samples.
Published Version
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