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: [image: 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
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
Seisunix mailing list Seisunix@mailman.seismic-unix.org https://mailman.seismic-unix.org/listinfo/seisunix
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@mailman.seismic-unix.org on behalf of Dominique ROUSSET dominique.rousset@univ-pau.fr Sent: Tuesday, August 25, 2020 2:50 AM To: seisunix@mailman.seismic-unix.org seisunix@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
_______________________________________________ Seisunix mailing list Seisunix@mailman.seismic-unix.orgmailto:Seisunix@mailman.seismic-unix.org https://mailman.seismic-unix.org/listinfo/seisunix
-- |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@univ-pau.fr jami:drousset http://lfc.univ-pau.fr%7C |Off: +33 559 407 423|Cell: +33 660 861 391|xmpp: dominique@rousset.nom.fr|mailto:dominique@rousset.nom.fr|
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@mailman.seismic-unix.org on behalf of Dominique ROUSSET dominique.rousset@univ-pau.fr *Sent:* Tuesday, August 25, 2020 2:50 AM *To:* seisunix@mailman.seismic-unix.org seisunix@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
Seisunix mailing list Seisunix@mailman.seismic-unix.org mailto:Seisunix@mailman.seismic-unix.org https://mailman.seismic-unix.org/listinfo/seisunix
-- |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@univ-pau.fr jami:drousset http://lfc.univ-pau.fr%7C |Off: +33 559 407 423|Cell: +33 660 861 391|xmpp: dominique@rousset.nom.fr| mailto:dominique@rousset.nom.fr|
seisunix@mailman.seismic-unix.org
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Dominique ROUSSET -
Erdi Apatay -
Ty Collins