Improved Density Log Lithology Identification Using a Borehole-Compensated Photoelectric Factor


G.L. Moake, W.E. Schultz,

28th Annual SPWLA Symposium
in London, England June 29 – July 2, 1987



A photoelectric factor (Pe) measurement is now commonly available with density tools. By aiding in lithology identification, Pe information provides better estimates of matrix densities, thereby improving porosity interpretation from density logs. Pe measurements, however, are adversely affected by borehole rugosity and mudcake. In order to minimize these effects, a borehole compensation method has been developed that yields improved Pe accuracy in non-barite muds.