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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 63 (1979)

Issue: 9. (September)

First Page: 1602

Last Page: 1602

Title: Smackover Reservoir--Interpretation Case Study of Water Saturations Versus Production: ABSTRACT

Author(s): J. Guillotte, J. Schrank, E. R. Hunt

Article Type: Meeting abstract


Predicting the initial production from wells drilled in certain Smackover reservoirs is often difficult. Production history from the field, core analyses, and log data have not always proved to be helpful.

The Smackover reservoirs for which interpretation is difficult fall into two categories. The first is oolitic limestone characterized by low resistivity, moderate porosity, and reasonable permeability. High water saturation (Sw) calculated from logs does not necessarily preclude hydrocarbon production. The second is oomoldic limestone typically having high resistivity, very high porosity, and low permeability. Although log interpretation indicates low water saturation, no hydrocarbons are produced.

Cores from these reservoirs were studied to evaluate the relations now employed for understanding and predicting production. The investigation included determination of the "m" and "n" exponents (commonly known as the cementation and saturation exponents in Archie's equation), evaluation of the microporosity by scanning-electron microscopy, and laboratory determination of density, porosity, and permeability.

Results of the rock physics investigation support the empirical relations established, provide data for improved interpretation, and can be expanded to include other Smackover reservoirs within the same diagenetic facies.

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Copyright 1997 American Association of Petroleum Geologists