This crossplot is used to determine a BUCKLE number from water saturation - porosity data sets. Typically core data are used. Each line represents a constant BUCKLE (bulk volume water) number and the value of each line is displayed as a label.
Start by inputting porosity-water saturation data series, (green, blue and orange cells). Each data series allows for an unlimited number or rows of data, and cut and paste functionality is available. Review how the data plot and assign a BUCKLE number to be used for petrophysical work.
Buckles, R. S.,”Correlating and Averaging Connate Water Saturation Data.” The Journal of Canadian Petroleum Technology Volume 4, Issue 1, January 1965: 42-52.
Morris, R.L., and Biggs, W.P., "Using Log-Derived Values Of Water Saturation And Porosity." SPWLA Eighth Annual Logging Symposium, June 12-14, 1967.