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The Grayburg reservoir of the Foster - South Cowden field has been produced since 1938 and water-flooded since 1962. Production had declined to near abandonment level at the start of this project. The initial approach to construction of the flow model was conventional. Logs and cores provided the basis for a geological model. Production data was assembled and validated as were the few measured pressures taken early in the fields history. Production testing of all wells was initiated with new equipment to provide accurate current production data. Pressure transient testing of all wells was initiated to provide accurate current pressures. History matching pressures and water cuts validated the flow model and the flow model has since guided field operation, subject to the limits imposed by the spacing of the well data which was one reliable well log per 32 acres of reservoir. At this scale compartmentalization, heterogenialy, of the reservoir was obvious, requiring the use of 3-D seismic to define porosity in the area between wells. The 3-D seismic data set was reprocessed to retain high frequencies, thereby improving vertical resolution to the range of 50 feet. Seismic traces sample areas are 110 by 110 feet (bin size). Seismic inversion model traces exhibit a high degree of correlation to the well log data and a correlation was developed between seismic velocities and porosity for each geologic zone. The correlation was used to develop porosity maps for each zone used in the flow model. The resulting flow model was validated through the history matching process and used to guide the redevelopment of the waterflood. P. 115

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