[OpendTect_Developers] Get seismic in well position

[Fernando Bordignon]

Arnaud, thanks for your reply. I ended up finding the uiWellLogExtractGrp
at the crossplot window. That did the trick, at least for now.The use of
deviated wells is an interesting next step, I most certainly will take a
look at it. The other ideas of stacked traces inside a stepout and
laterally filtered seismic are a natural evolution for our code, thanks
again for the tips.

We are working on a Bayesian approach for wavelet extraction and seismic
inversion, these last days we were implementing our routines as a plugin
for OD.

Regards,
Fernando.




On Wed, Feb 12, 2014 at 5:25 AM, Arnaud Huck <arnaud.huck at dgbes.com> wrote:

>  Dear Fernando,
>
> An alternate way to do this would be to define a volume statistics
> attribute in your code, that will take care of extracting the relevant data
> in a given stepout, and return you the stacked trace. Put your track
> geometry in a datapointset, set the correct attribute definition and then
> call the function
>
> Executor* Attrib::EngineMan::getTableExtractor( DataPointSet& datapointset,
>                                         const Attrib::DescSet& descset,
>                                         BufferString& errmsg, int firstcol,
>                                         bool needprep )
>
>
> that will compute the attribute values for all points (samples) of the
> datapointset. The attribute would need to be defined like in
> plugins/uiGapDecon/uigapdeconattrib.cc  (createVolStatsDesc function).
>
> Note 1: There is a already a class that samples the track, such that you
> would get the positions along the track at a fixed sampling rate
> (wellextractdata.h I believe). That would handle deviated wells also, not
> only vertical wells.
>
> Note 2: The synthetic-to-seismic tie module already does such wavelet
> extraction using a Wiener-Levinson deconvolution, although without the
> lateral trace averaging. In some way, it is equivalent to input the raw
> seismic data and perform the trace averaging in the code, or input a
> laterally filtered seismic to be extracted at the nearest trace location.
> Have a look at WellAttrib for the existing code.
>
> Best regards,
> Arnaud Huck.
>
> -- Chief Geophysicist
> -- dGB Earth Sciences
> -- Nijverheidstraat 11-2, 7511 JM Enschede, The Netherlands
> -- mailto: arnaud.huck at dgbes.com, http://www.dgbes.com
> -- Tel: +31 53 4315155 , Fax: +31 53 4315104
>
> Le 06/02/2014 18:00, Fernando Bordignon wrote :
>
> Hi, I'm developing a wavelet extraction plugin based on well logs and
> seismic amplitude, so I need to collect the nearest trace to the well
> track. My track is vertical.
>
>  I was thinking in creating a SelData by computing a small square of
> traces (say 3x3 or 4x4) that I expect to be at the well position. Then I
> would get the traces by a SeisTrcReader limited by this SelData. With the
> SeisTrcInfos in hand I cal get the coordinates and calculate the one that
> is the nearest to the well coordinates. There are any other ways to do it?
>
>
>  Thanks,
> Fernando Bordignon
>
>
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