more depth to time business

[Brian Brennan]

Good afternoon all. 

TGIF to you all. 

Sorry to bother you all with this again, but  I'm still on this depth to time conversion business. Thought I had it worked out but I guess I don't.

Probably repeating myself - apologies for that, but here is what I've done and what I want to do:

I have an OD depth project. Into that project I've loaded amplitude seismic and an interval velocity volume. Both look as they should. I used the velocity volume to create a velocity model.  Seemed to work fine, though I don't know how to  view it or if that is possible in OD.

 - I imported a depth horizon picked on a grid of lines and traces from another application. 

 - Used the Processing - Time-Depth Conversion - Horizon function to convert from depth to time. Seemed to work but I can't look at it in this project. 

 - I exported the resulting horizon.

 - I  imported it back into  my other application.

It looks like the export file has every line/trace from the survey and, not surprisingly, most of the traces have crazy low values which are probably effectively null values. Is there a way to convert depth to time and only get the live line/trace data that I imported, or does the conversion create a surface?

Thanks again. Have a good weekend.

--

Brian Brennan

Geophysicist

337-258-3641

email: BrianDB...@gmail.com

website: Third Wave Geophysics.com

[Paul de Groot]

Hi Brian,

A velocity volume can be displayed as any other seismic attribute volume. A velocity model can be visualized by adding a Volume Builder display element to the object in the tree. Select the saved Volume Builder Processing workflow (Add ->Volume Builder Attribute in the tree).

Regarding the second question, how to display the depth-to-time converted horizon in OpendTect, assuming you have a Pro license, you can do the following: 

1. If your velocity volume is an interval volume, convert it to an average volume (Processing->Create Seismic Output->Velocity Conversion ... menu)
2. Instead of using the Horizon - Time-Depth Conversion option, use the Horizon Mathematics option (Processing->Horizon Mathematics ... menu)
3. Define the formula and output the result as a new horizon (not horizon data).

I hope this helps. 

Best regards,

Paul.

--

Paul de Groot

Special Adviser

-----------------------------------------------------------------------------------------------------------------------   dGB Earth Sciences
Phone: +31 53 4315155 E-mail: paul.d...@dgbes.com Internet: dgbes.com

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