Topic:
Unable to save a calibrated sonic log in Tools > Velocity Survey.

Description:
Attempt to save a calibrated sonic log in Tools > Velocity Survey.
Receive error message:   No log class of SONIC.


 

Solution:
Use an edited checkshot as the time/depth relationship in the synthetic panel
and it will do the sonic calibration on the fly. It uses the Linear 
calibration method rather than a point to point calibration.  

  1.) Select the checkshot in Define > Time/Depth... and toggle the 
      relationship to checkshot or preferred checkshot, dependent on what
      checkshot you want to use.

  2.) Make sure the checkshots are properly edited before using them to do
      the pseudo calibration in Tools > Velocity Survey... by editting out
      any "bad" checkshots so they do not create a reflection coefficient 
      where there should not be one.  
 
  3.) Calibrate.     
      Look at the results of the calibrated and uncalibrated logs plotted
      over each other.
   
  4.) Save Data... to save the edited checkshots and make them the preferred
      DVT since the calibrated sonic curve cannot be saved at this point.
  
  5.) Redisplay the synthetics panel using the edited checkshot in 
      the DVT panel. 


If you use the above workaround it should give you the same results as if
you used a calibrated log, minus any above the top of log calibration that
may have occurred in a normal calibration sequence.


RESOLUTION:  Fixed in GeoFrame 3.6
 

 



Last Modified on: 16-AUG-99