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A Pickett Plot is a double logarithmic plot of resistivity versus porosity.
To add a Pickett Plot, select Options>Pickett Plot. Here, add the cementation, saturation, tortuosity, and water resistivity coefficients at formation temperature.
The Pickett Plot Overlay displays up to 3 water saturation lines based on the Archie water saturation equation:
Log(RT) = -M*Log(PHI) + Log(A*Rw) - N*Log(Sw)
Constants are supplied for M, N, A, and Rw. Up to 3 Sw values can be specified. Each Sw value produces a separate line on the cross plot.
The cross plot must have a Resistivity curve as the X axis and a Porosity curve as the Y axis. Both axes must be log 10 scale. Typically the Porosity is scaled from 0.01 to 1.0 and Resistivity is scaled from 0.1 to 1000.
The Pickett Plot can have up to three water lines. By default, the 100% water saturation line is added. To change these water saturation lines, enter in the desired percentage (in decimal values from 0 to 1) and toggle the relevant lines button to the left.
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