--> ABSTRACT: The Integration of Pore Measurements into Log Analysis Pattern Recognition Procedures: Methods and Examples, by J. H. Dobeton, W. J. Guy, and W. L. Watney; #91021 (2010)

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The Integration of Pore Measurements into Log Analysis Pattern Recognition Procedures: Methods and Examples

DOVETON, JOHN H.; WILLARD J. GUY; and W. LYNN WATNEY

Recent advances in nuclear magnetic resonance logging have revolutionized the industry's ability to characterize zone productivity through the distinction of bound water in micropores from free fluids in macropores. The developments have also stimulated renewed interest in pore-throat size distributions from core capillary pressure data that have been recorded for many yearn. Even where neither NMR nor capillary pressure measurements are available, both the concepts of pore/pore throat size distribution and numerical data as analog can be used to enhance interpretations from older log combinations on crossplots.

The crossplot of resistivity and porosity on logarithmic scales (the "Pickett plot") is a powerful graphic medium to interrelate a host of reservoir properties. Although the plot is most commonly used to evaluate formation water resistivity and the values of Archie equation constants, its primary value as a pattern recognition device for complex reservoirs was the major reason for its introduction by Pickett. The plot represents a map transformation from input resistivity-porosity axes to fluid saturation-porosity coordinates. Therefore, properties linked with saturation and porosity can be mapped as trends, such as permeability, capillary pressure, pore and pore-throat size, while crossplotted zones can be differentiated between separate petrofacies and flow units. This methodology of petrofacies analysis therefore closely integrates geological aspects of pore properties with reservoir engineering concerns of performance.

AAPG Search and Discovery Article #91021©1997 AAPG Annual Convention, Dallas, Texas.