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Improvements in seismic data acquisition and processing techniques make it possible to observe geologically significant information in seismic records which has not been evident in the past. New types of measurements help in locating and analyzing geologic features, including some hydrocarbon accumulations. Analysis of a seismic trace as a component of an analytic signal permits the transformation to polar coordinates and the measurement of quantities called “reflection strength” and “ instantaneous phase.” These, plus several other quantities derived from them, are called attribute measurements and can be coded by color on seismic sections. Such color displays permit an interpreter to associate measurements and changes in measurements with structural and other features in the seismic data. They thus facilitate identification of interrelations among measurements. A series of examples shows how such analysis and display helps in locating and understanding faults, unconformities, pinchouts, prograding deposition, seismic sequence boundaries, hydrocarbon accumulations, and Stratigraphic and other variations which might be misinterpreted as hydrocarbon accumulations.

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