Integrate traveltime tomography with SD

[Kristina Kucinskaite]

Dear OpendTect team,

I would like to try calculating thickness of layers based on the λ/4 principle.

I have (1) 2D seismic profiles decomposed using CWT and (2) p-wave velocity models from the same 2D profiles. 

I can get p-wave velocity models in segy format. 

What would be the best approach to do this (using maths attribute ect.)? 

Would love to hear your suggestions?

Best regards,

Kristina

[Paul de Groot]

Hi Kristina,

Nice problem. Please see the attached presentation to see how this can be done in OpendTect. Note, that the example only has 3 spectral components. You can extend this to as many components as you need. Each time compare two examples and output the frequency of the one with the highest amplitude, compare the result with the next component, until you have found the dominant frequency. I recommend using an interval velocity volume in the tuning thickness attribute.

Good luck and best regards,

Paul.

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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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[Kristina Kucinskaite]

Thank you Paul! I appreciate your help. So far I have been able to produce dominant frequency images (see attached image). 

However, the velocity models that I have, are in segy format. This is because they are computed from inversion software.

I am able to import the velocity models as segy profiles in OpendTect, but I cannot use it in attribute analysis, since it is treated as a different dataset.

Is there any workaround for this?

Best regards,

Kristina

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[Mark Crawford]

Hi Kristina,

Paul has asked me to reply to you.... this is a tricky problem for a number of reasons.

I'll reply to you separately via the support channel - I have a number of questions that may be best dealt with without an audience (to begin with, at least).

Once we have a resolution, we can publish the method & results on this thread.

Kind regards,

Mark

Mark Crawford

Support Manager

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

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