Granny Creek oil field is located in Southern West Virginia in the Appalachian Basin. It has been producing from the Big Injun formation. Primary production was initiated in the 1920's and continued until early 1970's. Around the mid 70's, new wells were drilled and a waterflood project was started which is still in progress. During the course of the waterflood project, some problems were encountered. These problems included, inconsistency in sweep efficiency in adjacent patterns, and high injection pressure.

In this field often two adjacent five spot patterns with similar injection to pore volume ratios exhibit totally different oil and water production rates. While water does not breakthrough in some patterns for months, other patterns experience instantaneous water breakthrough. Unusually high injection pressure is observed almost throughout the field, and yet some injection wells exhibit normal injection pressures.

Presented in this paper is a summary of approaches, methodologies, results and conclusions that have been reached during the performance evaluation of this waterflood project. With the aid of reservoir simulation studies, some major heterogeneities were characterized and modeled for this field. Interpretations of seismic studies were used to confirm the orientation of such heterogeneities in the field.

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