[Seisunix] Zero Offset VSP help

Dominique ROUSSET dominique.rousset at univ-pau.fr
Wed Aug 26 10:57:55 CEST 2020


Hi,
do you mean convert a t(z) function to a Vrms(t) function ?
This is the job of the velconv tool. Need to interpolate your FB picks
using unisam before.

D.

Le 25/08/2020 à 14:35, Ty Collins a écrit :
> Anyone use SU to pick the first breaks and to review Stacking
> Velocity? Can it be done in SU? I usually get data sorted then migrate
> into a 3rd party software to determine stacking velocity. Anyone doing
> this is SU?
>
> ------------------------------------------------------------------------
> *From:* Seisunix <seisunix-bounces at mailman.seismic-unix.org> on behalf
> of Dominique ROUSSET <dominique.rousset at univ-pau.fr>
> *Sent:* Tuesday, August 25, 2020 2:50 AM
> *To:* seisunix at mailman.seismic-unix.org
> <seisunix at mailman.seismic-unix.org>
> *Subject:* Re: [Seisunix] Zero Offset VSP help
>  
> Hi,
> just a few suggestions :
> - check the output data for each step to find where it fails.
> - print the FK amplitude spectrum to check your filter parameters (why
> do you use 3 parameters for the filter ? slopes=-something,+something
> amps=0,1 should be ok to keep positive slopes. Before and after FK
> filtering.
> - use suxwigb key=gelev (or the parameter describing geophone depth)
> to produce well labeled plots of the seismic data in T-Z domain
> instead of suximage
> - I prefer to pick the first breaks before FK (or zero phase F) filtering
>
> Hope it helps
>
> D.
>
> Le 25/08/2020 à 01:35, Erdi Apatay a écrit :
>> Hello All
>>
>> I have a script I am using for Zero Offset VSP processing. First of
>> all, my first three traces looked cut so I rejected them. After
>> getting rejected file, I filtered out the downgoing wavefield by
>> sudipfilt. Then, I picked arrivals on the zero amplitude line
>> corresponding to picking amplitudes. Then, I converted those arrival
>> times (seconds) to milliseconds and saving them in a txt.file. After
>> that, txt file is converted from ascii to binary format. Finally, I
>> am adding those time values to the traces by sustatic command.
>> At this point, however, when I try to plot the flattened upgoings,
>> the script plots just a so narrow part as follows:
>> fkfiltflat.PNG
>>
>> Can you help me with this issue? I tried to change a lot of things
>> but I could not get whole flattened upgoings. 
>>
>>  If you would like to check my script, I added here.
>>
>> Thank you
>> Erdi
>>
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> -- 
> |Dominique Rousset           LFCR UMR5150 / E2S UPPA / Dpt des géosciences| 
> |Univ. Pau et des Pays de l'Adour BP 1155       F-64013 Pau Cedex - France|
> |mailto:dominique.rousset at univ-pau.fr jami:drousset http://lfc.univ-pau.fr|
> |Off: +33 559 407 423|Cell: +33 660 861 391|xmpp: dominique at rousset.nom.fr| <mailto:dominique at rousset.nom.fr|>

-- 
|Dominique Rousset           LFCR UMR5150 / E2S UPPA / Dpt des géosciences| 
|Univ. Pau et des Pays de l'Adour BP 1155       F-64013 Pau Cedex - France|
|mailto:dominique.rousset at univ-pau.fr jami:drousset http://lfc.univ-pau.fr|
|Off: +33 559 407 423|Cell: +33 660 861 391|xmpp: dominique at rousset.nom.fr|

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