Abstract
Stratigraphic trap production in the Cottonwood Creek field is controlled by loss in porosity and facies change in the “E” zone of the Phosphoria dolomite. The edge of the field was delineated on the seismic records through loss in amplitude of the high‐frequency “E” zone reflection due to thinning and decrease in velocity contrast of the “E” zone. Variable‐area cross‐sections show vividly this stratigraphic change. This study indicates that present techniques of magnetic tape recording and processing coupled with synthetic seismograms and the attendant filter theory approach to the seismic method have increased the capability of the seismic method to find stratigraphic traps.
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