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Migration in complex geological areas 
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Joined: Fri Feb 22, 2013 1:53 pm
Posts: 2
Post Migration in complex geological areas
Hello, I am new to processing and interpretation of seismic data. So I was wondering what is the best migration method to be applied during the processing when we are looking for subsalt reflections? I know prestack depth migration algorithms are a must when subsalt imaging is required, but which PSDM method gave you best results in practice? Also I would like to know if there is a PSTM algorithm except Kirchoff migration that can be used to get better subsalt image quality.

NOTE: I am working on a 2D survey if that is relevant.


Fri Feb 22, 2013 2:00 pm

Joined: Fri Mar 16, 2012 1:34 pm
Posts: 1
Post Re: Migration in complex geological areas
Buenas soy procesador sismico con un poco de experiencia y te puedo decir que en produccion la que mas se usa es la PSTM (Kichooff) si el dato esta en 2D, lo que si te recomiendo que tienes que acondiccionar el dato previamente antes de hacer la migracion en cuanto a la conservacion de amplitudes sismicas y usar por ejemplo una secuencia como si fueras a hacer AVO.


Thu Oct 03, 2013 3:36 pm

Joined: Sat Jun 30, 2012 1:08 pm
Posts: 8
Post Re: Migration in complex geological areas
Sorry got up late.
But still replying as it may benefit you next time.
If the structure is complex like salt ..., best is PSDM.
best module available are Reverse time/ shot / Beam or CRAM / Kirchhoff. Arranged according to decreasing cost and decreasing quality.
Usually Kirchhoff is good enough.
happy time ahead in the wonderland of Seismic
Rajesh


Thu Feb 13, 2014 1:09 pm

Joined: Sat Feb 15, 2014 7:33 am
Posts: 31
Post Re: Migration in complex geological areas
While Rajesh is totally correct, I think its worth commenting that there are some hybrid pre-stack time/depth migrations that might give a "good enough" solution depending on what you are after.

These are usually Kirchhoff pre-stack time migrations that use more sophisticated approaches to developing an operator which is asymmetric and varies with the (RMS) velocity of the output location - its a better approximation than a standard Kirchhoff preSTM but one that runs many times faster than a standard preSDM.

In general, things like preSDM obey the "80/20" rule - in that 80% of the time/cost is in getting the last 20% of image improvement. Hybrid PreSTM/DM routines can get you to the "80%" solution for 20% of the time/cost.


Sat Feb 15, 2014 7:43 am

Joined: Sat Jun 30, 2012 1:08 pm
Posts: 8
Post Re: Migration in complex geological areas
Yes well said. The 80-20 rule amply defines the situation.
In short any algorithm that accounts for ray bending/ multi path will do.
Thanks


Sat Feb 15, 2014 1:06 pm
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