Topic:
How do I adjust log curve posting in time along my wellpaths?

Description:
I have wellpaths displaying on my seismic, and I have curve data loaded.

I have a good marker on my sonic log, and I know where it should be positioned on my seismic, but it is shifted.  

Solution:
1) In DataManager > Wells > Wells, select your well, and then click on 'Log
   Header' button.

2) Select your sonic log from the 'Select Log Name' dialog box, and then click 
   'Create DVT from sonic'.  Note the name of the DVT created (it should be
   ).

 *Note: This process integrates the us/ft values into ft/sec values, and
  creates a Time/Depth/Velocity relationship (DVT) for the log.  In this
  process, the velocity for the first sample in the log is used for the 
  constant velocity from the top of log to the Seismic Datum.  This assumption
  will invariably cause the log to be positioned incorrectly.

3) In DataManager > Well + T/D, select the well, and associate it with the 
   newly created DVT.

4) Display the well with the sonic log, and make note of the time position
   of your marker on the sonic log.

5) Calculate the shift required for the sonic log marker to line up with the
   seismic event (shifting the marker down requires a positive shift, shifting
   it up requires a negative shift).

6) Open Synthetics, and in File > Well > Well list, select the well.

7) In Mode > Synthetics, select your sonic log, enter your calculated shift
   under Bulk shift (msec), and the click Apply.

8) In File > Save > Synthetic data, select 'Synthetic 1' in the 'Synthetic
   class' dialog box, and type in a class name in the 'Name field for Synthetic
   classes'.  Then, under DVT Operations, toggle on 'Create New DVT', and
   toggle on 'Yes' under Preferred DVT, check to make sure the bulk shift is
   what you specified, and click 'Save Synthetic Class'.

 The log displayed in the seismic window will now be shifted by the amount 
 specified in Synthetics.  If you want to refine the shift, follow steps 6
 through 8 again using the new value (if you change your shift from 83 to 88
 msec, you must specify 88 msec the second time around, and not just the 
 5 msec difference between 83 and 88).



Last Modified on: 12-AUG-98