Problematical petrophysical characteristics of Smackover at Bayou Middle Fork field, Claiborne Parish, Louisiana

Conference · Thu Sep 01 04:00:00 EDT 1983 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:6827933

Turner, J R

Values of irreducible water saturation calculated from conventional electric and porosity logs at Bayou Middle Fork field are commonly greater than 60%. Mercury injection curves reveal that the true 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. Application of the Archie equation, the Guillotte et al technique, and the Rocky Mountain technique provides a different suite of water saturations. Archie water saturations average about 75% when density-neutron porosity values are used. When core corrected porosity is used, the Archie saturation averages about 60%. The Guillotte et al technique employs a variable textural parameter which is dependent on porosity and permeability. Mean water saturation with this method averages about 49%, which is in better agreement with the mercury injection data. The Rocky Mountain ratio yields water saturations that are too high until the porosity balance technique is applied. Since R/sub t//sub a/ is assumed to read too low due to the excess immobile water, the Rocky Mountain derived porosities are too low. When R/sub t//sub a/ is increased to balance the porosity the water saturation averages about 43%, using z = .025. When the Rocky Mountain R/sub t//sub a/ is used in the Archie equation, water saturations more consistent with the mercury injection data result. In addition the difference between the observed R/sub t//sub a/ and the Rocky Mountain derived R/sub t//sub a/ can be plotted as a function of porosity.

• Research Organization: Pruet Oil Co., Shreveport, LA
• OSTI ID: 6827933
• Report Number(s): CONF-8310301-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 67:9
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
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& Exploration
ELECTRIC LOGGING
ELECTRON MICROSCOPY
EQUATIONS
FEDERAL REGION VI
LOUISIANA
MICROSCOPY
NORTH AMERICA
PERMEABILITY
POROSITY
RESERVOIR ROCK
SATURATION
SCANNING ELECTRON MICROSCOPY
TEXTURE
USA
WATER SATURATION
WELL LOGGING