[Users] Chimney cube

[Friso Brouwer]

Dear Akuruchai,

"frequency wash-out ratio (RMS)" is not the final output attribute. The 
purpose of the NN Chimneycube attribute set is to have multiple 
attributes available that can serve as input for a neural network (NN), 
one of the OpendTect plug-ins. Basically the combination of attributes 
and a neural network make sure that different aspects of gas chimneys 
(verticality, chaotic reflectors, incoherency between traces, low S/N 
ratio,  bias in the frequency spectra) are detected.  This results in a 
better picture of the object "gas chimney".

The workflow is as follows. You as a user pick (using 2 picksets) 
positive and negative examples for the feature "chimney". Then the NN is 
trained using the these multiple attributes , which are extracted at the 
picked locations (together with the user defined answer "chimney" or 
"not chimney"). Once the NN is trained on these known points the NN can 
be applied on the rest of the seismic volume for QC and to create a 
stored volume in "process seismics". More information can be found from 
this pages:

http://www2.dgb-group.com/nn_doc.html
and
http://www2.dgb-group.com/rel/html/dgb/c892.htm#LINK-MAKE.CHIMNEYCUBE

I hope this answers your question.

Kind regards,

-- 
Friso GC Brouwer
Chief Geophysicist

dGB-USA
One Sugar Creek Center Boulevard
Suite 935
Sugar Land, TX, 77478

Tel 281 240-3939 (main)
Tel 281 240-6957 (direct)
Fax 281 240-3944
e-mail friso.brouwer at dgb-group.com
http://www.dgb-group.com





Akaruchai Nochaiwong wrote:
>
> Dear All,
>
>  
>
> I am working on Chimney cube using OpendTect. I found the attribute 
> set as show in picture below.
>
>  
>
> In my understanding, the frequency wash-out ratio (RMS) should be the 
> final cube. Can anybody help me explain which one (in this attribute 
> set) is the final cube for gas chimney detection?
>
>  
>
> Thank you in advance.
>
>  
>
> Best regards,
>
> Akaruchai N.
>
> Geophysicist, Thailand.
>
>  
>
> ------------------------------------------------------------------------
>
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