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.
