Every seismic interpretation project needs to begin with an attempt to tie seismic reflectors to geologic units via synthetic seismograms. However, the synthetics normally do not tie character-wise to the seismic, and require stretching (occasionally squeezing). Check-shot surveys are frequently used in an effort to determine the amount of stretch necessary. However, the time-depth relationships from check shots usually differ by alarming amounts from the time-depth relationships from sonics. There is usually no discernible pattern to the mismatches. The interpreter knows that both check shots and compressional acoustic (sonic) logs are subject to error, so there is no way to...

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