For confidentiality reasons I don't have any interesting examples of synthetic seismograms.  I am therefore showing an example of the importance of careful log scrutiny before synthetics and time depth curves are generated from sonic logs and checkshot surveys.

The SynTool™ display shows how the sonic log, when calibrated with the checkshots, has a dramatic kink [arrowed], not seen in the raw log.

The SynTool™ user can opt to generate the synthetic seismogram from the raw sonic to avoid this problem affecting the calculated synthetic seismogram, but what about the derived time depth curve?

The velocity log [here produced by VELIT™] reveals how the calibration induced kink in the sonic log shows itself as a velocity break [arrowed] in the middle of the stratigraphic unit.

Errors will occur if this velocity log is input to calculate V0,k, perhaps for velocity modelling purposes, for that stratigraphic interval.

The second SynTool™ display shows how this distortion caused by one checkshot can be reduced [arrowed] by using a different calibration method within the SynTool program.