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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 size, interparticle porosity, 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 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.
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.