Specify a depth that is above the top of the log so that the synthetic is pushed deeper. For Kingdom users, the datum is imported from Kingdom and applies to the entire project, so instead of changing the datum itself, change the time at a given depth point, which inserts the appropriate velocities in the log section added.

Specify a depth point on the sonic log to tie to time zero on the seismic section. The range from the top of the well to the new datum must be greater than zero.

Correlate the depth point tie to time using the top of the sonic log as time zero.

Type a time that's greater than zero.

Select the time units and time measurement system to use when making the tie. The units shown in the boxes above reflect the current selection.

Select the depth units to use when making the tie. The units shown in the boxes above reflect the current selection.