Problematic Petrophysical Characteristics of the Smackover at Bayou Middle Fork Field, Claiborne Parish, Louisiana, by James R. Turner, Pages 95 - 106
from:
East Texas Geological Society Publication: The Jurassic of East Texas, Edited by Mark W. Presley
Copyright 1984 by East Texas Geological Society. All rights reserved.

Problematic Petrophysical Characteristics of the Smackover at Bayou Middle Fork Field, Claiborne Parish, Louisiana

James R. Turner
Pruet Oil Company,
206 Beck Bldg,
Shreveport, Louisiana 71101

ABSTRACT

Values of irreducible water saturation calculated from conventional electric and porosity logs at Bayou Middle Fork Field are often greater than 60%. Mercury injection curves reveal that the irreducible water saturation averages about 40%. Scanning electron micrographs show oolitic grains that have been recrystallized and have rough irregular surfaces as well as intercrystalline porosity within the particles. Water adheres to these grain surfaces and occupies some of the intercrystalline porosity in productive zones, causing the calculated water saturations to read too high. Application of the Archie equation, the Guillote technique, and the Rocky Mountain technique each provide a different suite of water saturations.