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The AAPG/Datapages Combined Publications Database

Williston Basin Symposium

Abstract

NDGS/SKGS-AAPG

North Dakota Geological Society & Saskatchewan Geological Society: First International Williston Basin Symposium, October 9-12, 1956

Pages 141 - 148

NEW LOGGING APPROACHES FOR EVALUATIONS OF CARBONATE RESERVOIRS

B. M. McVICAR, Schlumberger Well Surveying Corporation, Houston, Texas
J. L. HEATH, Schlumberger Well Surveying Corporation, Houston, Texas
R. P. ALGER, Schlumberger Well Surveying Corporation, Houston, Texas

ABSTRACT

Carbonate reservoirs in different parts of the Williston Basin may be of several petrophysical types. These variations, plus differences in the viscosity of the oil, greatly affect the efficiency of flushing during invasion by mud filtrate. The combined use of a neutron and a microresistivity device will indicate the degree of flushing.

If the flushing is efficient, saturation interpretation is based on the MicroLaterolog - Laterolog combination.

If the flushing is inefficient saturation interpretation based on the neutron - Laterolog combination is indicated.

A basic term in these saturation determinations is Rw. Suggestions are made which will result in better evaluation of Rw from the SP even when Gyp-base mud is used.

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