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Up to this point, all our discussions were based on the premise that the seismic data to be interpreted had been suitably corrected to a flat and horizontal surface which, in each case, serves as a datum plane and below which the medium is one of constant seismic velocity. It is our present purpose to discuss the needs for corrections to the raw data and the various types of corrections which may be used.

Corrections to data are applied in order to reduce the problems to situations which in each case approximate as closely as possible the ideal from the theoretical standpoint and the solutions to which will yield results which, in turn, it is hoped will approximate “reality” from the practical standpoint. Experience alone shows that this goal is reasonably well realized in petroleum exploration seismology, for there is no laboratory for testing the over-all results except that of the years of successful experience.

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