ATTACKING THE PROBLEMS OF THE SYNTHETIC SEISMOGRAM

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Abstract
The four problems considered are the definition and simulation of the filtering effects which occur in the earth between the explosive and the case of the geophone, the problem of errors in the time scale of the synthetic record, the simulation of multiple reflection effects, and the difficulty of finding a representative comparison trace on the field record. A partial solution to the first of these is offered by Siran, examples of whose operation are presented. A method of assessing allowable errors in the time scale is discussed. Multiple reflections may be introduced by the preparation of multiple‐corrected reflection‐coefficient logs on a digital computer such as the IBM 709. The particular problems of multiple reflections from the base of the weathered layer (including “ghost” reflections) are discussed. The preparation of a “composite” trace is shown to be a partial solution to the problem of the comparison with the field record.