This crossplot allows the user to quickly calculate Hunt-Raymer sonic porosity, tied to a compressional sonic slowness value, using custom matrix and fluid compressional slowness values.
Inputs are highlighted in yellow and the custom sonic porosity output is in green.
For reference, sonic porosity functions using sandstone, limestone and dolomite matrix compressional slowness values are presented (orange, blue and purple lines). The data point associated with the custom inputs is plotted on the crossplot.
Raymer, L.L., Hunt, E.R. and Gardner, J.S., "An Improved Sonic Transit Time to Porosity Transform." SPWLA Twenty-First Annual Symposium, 1980, Transaction Paper P: 1-12.