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Exploration for stratigraphic traps is feasible using seismic methods. In the future, the seismograph will play a vital role in oil and gas discoveries through its deliberate use in the search for such traps. The location of stratigraphic traps is accomplished in a given petroliferous area after structural closures have been found, and the percentage of stratigraphic traps to structures should approach parity in many such areas. Thus, there are many such traps yet to be found where closed structural traps predominate.
A direct approach to finding wedgeouts by the seismic method is fraught with difficulties, but progress is being made in resolution of reflection data. Indirect approaches in which seismic data are used to provide the structural framework for the filling-in of geologic data are far more promising, and have been used successfully. Indirect approaches have been used to locate truncated formations, onlap wedges, extent of broad lenses, and channels. Delineation of reefs by seismic methods has proved very successful.
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