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→Rock fabric and petrophysical property relationships
===Rock fabric and petrophysical property relationships===
===Rock fabric and petrophysical property relationships===
The rock fabric elements important to petrophysical properties are particle [[Grain size|size]], [[interparticle porosity]], [[separate vugs|separate vug]] porosity, and the presence or absence of touching vugs. These elements can be identified and quantified by microscopic examination of [[Overview of routine core analysis|core]] material and related to petrophysical properties measured on the same material.
The rock fabric elements important to petrophysical properties are particle [[Grain sizes|size]], [[interparticle porosity]], [[separate vugs|separate vug]] porosity, and the presence or absence of [[touching vugs]]. These elements can be identified and quantified by microscopic examination of [[Overview of routine core analysis|core]] material and related to petrophysical properties measured on the same material.
In nonvuggy carbonates, [[permeability]] and [[Capillary pressure|capillary properties]] are a function of interparticle porosity and particle size. The addition of separate vug porosity to a carbonate reservoir rock increases [[Reservoir quality|storage capacity]], but has little effect on permeability. Separate vug porosity, however, has a large effect on the [[Calculating Sw from the Archie equation|Archie ''m'' factor]] used in water saturation calculations from wireline logs and on the acoustic transit time. Touching vug pore systems dominate [[Fundamentals of fluid flow|fluid flow]] and override the effects of interparticle porosity, particle size, and separate vug porosity.
In nonvuggy carbonates, [[permeability]] and [[Capillary pressure|capillary properties]] are a function of interparticle porosity and particle size. The addition of separate vug porosity to a carbonate reservoir rock increases [[Reservoir quality|storage capacity]], but has little effect on permeability. Separate vug porosity, however, has a large effect on the [[Calculating Sw from the Archie equation|Archie ''m'' factor]] used in water saturation calculations from wireline logs and on the acoustic transit time. Touching vug pore systems dominate [[Fundamentals of fluid flow|fluid flow]] and override the effects of interparticle porosity, particle size, and separate vug porosity.