This crossplot is used to identify rock mineralogy by comparing apparent matrix volumetric photoelectric factor to apparent matrix grain density.
Input cells are in yellow. Enter the average photoelectric factor, bulk density, and apparent neutron density crossplot porosity for the zone of interest.
Outputs are in green and include apparent matrix volumetric photoelectric factor and apparent matrix grain density. The associated data point is plotted on the crossplot.
Schlumberger's Industry Publication, "Log Interpretation Charts." Chart CP-21 from 2000 Edition.