See also
interpretation technologies
rock physics
computer mapping
depth conversion

Use of the SynTool™ synthetic seismogram package.

Being brought up to date

Example 1. Being careful with calibrated logs!

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?

SynTool™ Display
Calibrated and raw sonic logs

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.

Velocity Log

Syntool™ Display: Reduction of the distortion caused by checkshot calibration.