Find DHIs with Optical Stacking

TIPS & TRICKS
Find DHIs with Optical Stacking

When you’re looking for DHI’s, sometimes a simple tool can get surprisingly good results. In the right structure, optical stacking will highlight flat spots and contacts.

This workflow generates an optical stack by averaging samples in a direction. It works in time or depth, but it’s best done in depth to avoid velocity effects from shallower intervals.

  1. In the Control Panel > Process tab, click the blue "+" button and add a Volume Smoothing process.
  2. Type a name e.g. "Optical Stack (inline)".
  3. Select the Volume to stack.
  4. Spatial distance in the IL direction (changing CL): 0 metres
    • Note: stacking in IL direction changes CL.
  5. Spatial distance in the CL direction (changing IL): 1000 metres
    • Note: stacking in CL direction changes IL.
  6. Vertical smoothing radius: 0 ms

Optical stacking in any direction

By creating an arbitrary 3D survey, we can optically stack in any direction. We use Volume Resample to project the original data onto a rotated survey. We then follow the same process as above.

  1. Draw an arbline in the direction you wish to stack
  2. Create a dummy 3D survey using survey configuration.  
    • Match the orientation to the arbline direction.
  3. Open Volume resampling.
    • Resample stack data to new rotated 3D survey.
    • Choose stack data and new rotated 3D survey.
  4. Add resampled volume as input to volume smoothing process and follow workflow above.

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