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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Estimation of Interparticle and Separate-Vug Porosities from Resistivity and Total-Porosity Logs
Abstract
Porosity types other than interparticle porosity are common among carbonate rocks. Traditional methods of estimating hydrocarbon reserves are sensitive to these varying porosity types. In the case of vuggy or moldic porosity, sonic tools are commonly relied upon to differentiate vuggy porosity from interparticle porosity.
Unfortunately, because the sonic tool is typically considered an auxiliary tool in many logging situations, this type of measurement is commonly lacking in field studies. It has been noted, however, that the resistivity log also tends to ignore vuggy porosity in much the same way sonic logs do. Because resistivity logs are more common than sonic logs, a method of determining different porosity types using resistivity logs would be beneficial.
This paper introduces a method for differentiating interparticle and separate-vug porosity using two resistivity logs with differing depths of investigation, along with a total-porosity log. Examples are provided to show the effectiveness of the technique compared with the more traditional methods using the sonic log.
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