A seismic analysis using Stratimagic was performed on Sonat's Beargrass 3-D seismic survey located in the prolific reef trend of East Texas. Fifteen seismic anomalies had been identified and drilled during 1996-97. Production characteristics of these individual reefs varied widely indicating pervasive reservoir heterogeneity. Conventional seismic attribute analysis, although useful in delineating the distribution of reefal buildups was unsuccessful as a tool for characterizing differences in reservoir performance. Stratimagic facies maps were used to classify the trace shape of the reef interval into 15 different categories. Modifying the color palette to highlight reefs with a trace shape similar to the highly successful Fountain #1 anomaly gave a good correlation between high-rate and low-rate anomalies. This analysis quickly and accurately begins to characterize the differences between individual stratigraphic reservoir bodies that can be used for both future field development and as a tool for trend exploration before drilling.

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