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- Description: This chart is used to determine the apparent resistivity of the mud filtrate (Rmfa) from measurements from the EPT Electromagnetic Propagation Tool. The porosity of the formation (φEPT) can also be estimated. Porosity and mud filtrate resistivity values are used in determining the water saturation. Enter the chart with the known attenuation and propagation time (tpl). The intersection of those values identifies Rmfa and φEPT from the two sets of curves. This chart is characterized for a sandstone formation at a temperature of 150°F [60°C].
- Source: © Log Interpretation Chartbook (2009), Schlumberger
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