Seismic Datum Adjustments

If the source project has a SRD A seismic reference datum (SRD) is the elevation (with respect to MSL) at which the seismic travel time equals zero. (Seismic Reference Datum) that is different from the Petrel SRD A seismic reference datum (SRD) is the elevation (with respect to MSL) at which the seismic travel time equals zero. then the following data types will be shifted during import:

• Checkshots
• 2d seismic data sets (time domain)
• 3d seismic volumes (time domain)

• Seismic horizons (time domain)

In order to know how much to shift the time values by you are prompted to supply a replacement velocity. This should be the linear average velocity for the interval between the two SRDs.

A default replacement velocity can be specified in the Match Merge Option settings. The default value will be used and the replacement velocity window will not appear during import.