Well ties to seismic data establish the fundamental link between geology as we measure it in a well bore and the seismic expression of geology that we work with as interpreters. This tutorial presents an example of tying a well to time-processed seismic data using a blocked sonic log for a case in which neither a vertical seismic profile, a synthetic seismogram, nor a check-shot survey is available. The described procedure requires only pencil and paper to quickly produce an acceptable well tie.

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