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The plot above illustrates the effect of separate-vug porosity on air permeability. On the left side, grainstones with separate-vug (Svug) porosity in the form of grain molds plot to the right of the grainstone field in proportion to the volume of separate-vug porosity. Dolograinstones (right) with separate vugs in the form of intragranular microporosity plot to the right of the grainstone field.
Intragrain microporosity in an ooid grainstone results in high porosity and low permeability because it is located within the ooids and is poorly interconnected. In addition, the intergrain pore spaces have been greatly reduced in size by calcite isopachous and equant-spar cement.
Interparticle Pore Space Classification | Petrophysics of IPS Data and Classes | Vuggy Pore Space Classification | Petrophysics of VPS Data |
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