--> Abstract: The George & Stiles Method of Determining Porosity Cutoffs: A Computer Program, by K. C. Powers and J. J. Reeves; #91004 (1991)

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The George & Stiles Method of Determining Porosity Cutoffs: A Computer Program

POWERS, KATHLEEN C., and JAMES J. REEVES, University of Texas of the Permian Basin, Odessa, TX

Determination of porosity cutoffs useful in oil reservoir volumetrics has posed a problem in reservoirs with poorly developed permeability to porosity relationships.

This is especially common in the oil fields of the Permian basin.

In 1977, George & Stiles developed a new method for determining porosity cutoffs that does not require a high correlation between permeability and porosity in cored samples. This method is being used at Chevron and other oil companies in fields that have poor permeability to porosity relationships.

It was this author's attempt, through both synthetic modeling and real data analysis, to compare the George & Stiles method with traditional least squares analysis and quantify which method performed most accurately.

An IBM-PC graphics program was developed to quickly analyze these data and provide graphical representations of the analyses.

In addition, a modification was made to the original George & Stiles equations that greatly improves the accuracy of the method.

 

AAPG Search and Discovery Article #91004 © 1991 AAPG Annual Convention Dallas, Texas, April 7-10, 1991 (2009)