Abstract

Seismic data from the Paradox basin, southeast Utah, exhibit amplitude anomalies associated with the presence of Pennsylvanian algal mound reservoirs. An experimental line over the Patterson and Nancy fields shows amplitude reductions corresponding to reservoir mound facies. Amplitude reduction is due to the lateral facies change from intermound evaporite‐dominated facies to the carbonate algal mound facies. Porosity in the mound facies accentuates the amplitude reduction but the influence of porosity is minor compared to the effect of the lateral lithologic change. Recurrent movement on basement faults during the Pennsylvanian may have controlled the location of these mounds.

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