9 Apr
2023
9 Apr
'23
6:27 a.m.
Hi,
Greetings! I am working on marine multichannel seismic data. To see structural features, I
need to plot twt vs distance plot for last 56 km of the line. It is a very long line and I
want to observe only the feaures of last 56 km. However, I am struggling a lot to set x
axis values. I typed
suwind < 5thshot.su tmin=0 tmax=4 j=600 | sugain jon=5 | sufilter f=0,5,10,20
amps=0.,0.,1.,1., | supsimage perc=99 > 5th.ps
It has given me the image of th whole line. Whereasm I am expecting an image like the
image I have attached. Please help me out with making such an image. Thanks.
11 Apr
11 Apr
1:21 p.m.
Dear Elora,
I suggest you can try to find out CDP range of the profile what you want to
plot out (min=1 max=600 for example).
Then you can switch to Generic Mapping
Tool (GMT) or other software calculating
distances and plotting true distance frame.
Yi-Ching
從我的iPhone傳送
Elora Afrin <elora.afrin(a)students.tamuk.edu> 於
2023年4月11日 21:03 寫道：
Hi,
Greetings! I am working on marine multichannel seismic data. To see structural features,
I need to plot twt vs distance plot for last 56 km of the line. It is a very long line and
I want to observe only the feaures of last 56 km. However, I am struggling a lot to set x
axis values. I typed
suwind < 5thshot.su tmin=0 tmax=4 j=600 | sugain jon=5 | sufilter f=0,5,10,20
amps=0.,0.,1.,1., | supsimage perc=99 > 5th.ps
It has given me the image of th whole line. Whereasm I am expecting an image like the
image I have attached. Please help me out with making such an image. Thanks.
<sample image.PNG>
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5:02 p.m.
Dear Elora
I suggest to select the near offset trace from every shot record and plot
them side by side
On Tue, Apr 11, 2023 at 2:02 PM Elora Afrin <elora.afrin(a)students.tamuk.edu>
wrote:
Hi,
Greetings! I am working on marine multichannel seismic data. To see
structural features, I need to plot twt vs distance plot for last 56 km of
the line. It is a very long line and I want to observe only the feaures of
last 56 km. However, I am struggling a lot to set x axis values. I typed
suwind < 5thshot.su tmin=0 tmax=4 j=600 | sugain jon=5 | sufilter
f=0,5,10,20 amps=0.,0.,1.,1., | supsimage perc=99 > 5th.ps
It has given me the image of th whole line. Whereasm I am expecting an
image like the image I have attached. Please help me out with making such
an image. Thanks.
_______________________________________________
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6:49 p.m.
Use surange to get the range of headers.
Then use key and min keywords to limit the traces.
Also check your filter settings. Should amps be 0,1,1,0 instead perhaps?
gdr
On Tue, 11 Apr 2023, 21:02 Elora Afrin, <elora.afrin(a)students.tamuk.edu>
wrote:
Hi,
Greetings! I am working on marine multichannel seismic data. To see
structural features, I need to plot twt vs distance plot for last 56 km of
the line. It is a very long line and I want to observe only the feaures of
last 56 km. However, I am struggling a lot to set x axis values. I typed
suwind < 5thshot.su tmin=0 tmax=4 j=600 | sugain jon=5 | sufilter
f=0,5,10,20 amps=0.,0.,1.,1., | supsimage perc=99 > 5th.ps
It has given me the image of th whole line. Whereasm I am expecting an
image like the image I have attached. Please help me out with making such
an image. Thanks.
_______________________________________________
Seisunix mailing list -- seisunix(a)mailman.seismic-unix.org
To unsubscribe send an email to seisunix-leave(a)mailman.seismic-unix.org
12 Apr
12 Apr
12:10 a.m.
Hi Elora -
Riding on the back of Glenn's message, please know that, in addition to selecting time
(tmin, tmax), suwind can select traces, too:
| key=tracl Key header word to window on (see segy.h) |
|
| min=LONG_MIN min value of key header word to pass |
|
max=LONG_MAX max value of key header word to pass
|
|
|
Use surange to get the overall picture of your trace keys and use sugethw or sudumptrace
to get details of specific keys.
Also, Excel or LibreOffice Calc could be used for quick plots after extracting columns
from your .su files.
You might post the output from surange so we might give more informed advice.
David
. . . . . . . . . . . . . .
On Tuesday, April 11, 2023 at 12:50:29 PM MDT, Glenn Reynolds
<gdreynolds(a)gmail.com> wrote:
Use surange to get the range of headers.
Then use key and min keywords to limit the traces.
Also check your filter settings. Should amps be 0,1,1,0 instead perhaps?
gdr
On Tue, 11 Apr 2023, 21:02 Elora Afrin, <elora.afrin(a)students.tamuk.edu> wrote:
Hi,Greetings! I am working on marine multichannel seismic data. To see structural
features, I need to plot twt vs distance plot for last 56 km of the line. It is a very
long line and I want to observe only the feaures of last 56 km. However, I am struggling a
lot to set x axis values. I typed suwind < 5thshot.su tmin=0 tmax=4 j=600 | sugain
jon=5 | sufilter f=0,5,10,20 amps=0.,0.,1.,1., | supsimage perc=99 > 5th.ps
It has given me the image of th whole line. Whereasm I am expecting an image like the
image I have attached. Please help me out with making such an image.
Thanks._______________________________________________
Seisunix mailing list -- seisunix(a)mailman.seismic-unix.org
To unsubscribe send an email to seisunix-leave(a)mailman.seismic-unix.org
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13 Apr
13 Apr
9:05 p.m.
Hi Elora,
I don't really understand what you want to do.
- If you really want to see "structural features" you should compute a
stacked section first. This is quite a job if you are a beginner.
- If you want to get a quick look at the prominent geological features
of the area, you can extract a near offset section (suwind key=offset
min= max=) and perform some basic processing (filtering, gain).
At first glance, some parameters of your data look inconsistent/strange :
- 2356 CMP seems to be small for more than 100 km of seismic line (more
than 40 m cdp spacing)
- 40 m of CDP spacing means 80 m between hydrophones => more that 50 km
of max offset with 636 channels (not common) but surange says 126 km
This may be ok for wide angle reflection/refraction with OBS but strange
for vertical reflection with a streamer. What is the kind of your data ?
Try to run suazimuth offset=1 to check the offset values.
Regarding the sufilter command,
sufilter f=0,5,10,20 amps=0,0,1,1 is equivalent to f=5,10 amps=0,1 i.e.
a low cut filter. Is it what you want to do ?
By the way, as a teacher myself, I believe that your problems are beyond
the use of SU. Maybe you should spend some time with a good seismic
textbook or discussing with your supervisor/teacher. Sorry if I'm wrong.
Enjoy SU !
D.
PS : please, avoid 4 or 6 MB pictures to send just some plain text
information, big messages require manual intervention on the list
server. Copy/paste text instead.
Le 11/04/2023 à 20:49, Glenn Reynolds a écrit :
Use surange to get the range of headers.
Then use key and min keywords to limit the traces.
Also check your filter settings. Should amps be 0,1,1,0 instead perhaps?
gdr
On Tue, 11 Apr 2023, 21:02 Elora Afrin,
<elora.afrin(a)students.tamuk.edu> wrote:
Hi,
Greetings! I am working on marine multichannel seismic data. To
see structural features, I need to plot twt vs distance plot for
last 56 km of the line. It is a very long line and I want to
observe only the feaures of last 56 km. However, I am struggling a
lot to set x axis values. I typed
suwind < 5thshot.su <http://5thshot.su> tmin=0 tmax=4 j=600 |
sugain jon=5 | sufilter f=0,5,10,20 amps=0.,0.,1.,1., | supsimage
perc=99 > 5th.ps <http://5th.ps>
It has given me the image of th whole line. Whereasm I am
expecting an image like the image I have attached. Please help me
out with making such an image. Thanks.
_______________________________________________
Seisunix mailing list -- seisunix(a)mailman.seismic-unix.org
To unsubscribe send an email to
seisunix-leave(a)mailman.seismic-unix.org
_______________________________________________
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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@univ-pau.fr http://lfc.univ-pau.fr|
| Off: +33 559 407 423 Cell: +33 660 861 391 |
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5 comments
6 participants
participants (6)
-
David Forel -
Dominique ROUSSET -
Elora Afrin -
Glenn Reynolds -
Halitim Bachir -
Yi-Ching Yeh