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(a)mailman.seismic-unix.org> on behalf of Dominique
ROUSSET <dominique.rousset(a)univ-pau.fr>
Sent: Tuesday, August 25, 2020 2:50 AM
To: seisunix(a)mailman.seismic-unix.org <seisunix(a)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|
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