Hi Everyone -
I am writing to ask a favor. Do you have any small (fit into an e-mail or you might have a DropBox link) SEG-Y rev1 and rev2 datasets?
I am working on a YouTube video about importing from SEG-Y to SU ... and ... exporting from SU to SEG-Y. I am asking for these datasets so I can test "segyread" as I prepare the video and accompanying PDF documentation.
(My YouTube channel is "Seismic Rocks" and my web site is www.SeismicRocks.com)
I am pretty sure SU cannot handle an input SEG-Y file that has multiple trace headers (rev2). I don't see any parameters in "segyread" for handling multiple trace headers; although I admit, my C code knowledge is rusty.
However, I think SU might be able to import a rev1 file, a SEG-Y file that has one or more 3200-byte text blocks after the 400-byte binary header and before the first 240-byte trace header (see the attached figure). The reason I think this import might work is because "segyread" has parameter xfile (file to store extended text block), a parameter that appears similar to parameters hfile and bfile.
I would be grateful if you can send me small SEG-Y rev1 and rev2 files to test for my video.
Thank you!David. . . . . . . . . . . . . .
Note: Information relevant to rev1 is in the 400-byte binary header:
The SEG-Y document counts bytes in the 400-byte binary header as a continuation of the 3200-byte text header. That means the first four bytes of the binary header are numbered 3201-3204 in the document. Below, I put that numbering first, then numbering that starts at 1 (one) in square brackets ([ ]).
bytes 3501-3502 [301-302]: SEG-Y format revision number.
bytes 3505-3506 [305-306]: Number of 3200-byte extended textual file header records following the binary header. . . . . . . . . . . . . .
Hi,
first of all, best wishes to everybody. We are living hard times, both
with the pandemic and in the seismic business (which impacts academics,
too).
Actually, the SU wiki has been out of order a few days, following a
dokuwiki upgrade (incompatible plugins). It's fixed and the wiki is now
online again.
I remind you that a live community of SU users needs a live wiki (or
equivalent). A live wiki needs authors.
So, feel free to ask an account to feed the wiki with case studies,
tutorials and other interesting material !
D.
PS. Please don't use the cwp mailing list anymore it's not maintained
and new users subscribe to seisunix(a)mailman.seismic-unix.org). It may be
useful to remove this address from your address books to avoid automatic
completion.
Le 04/01/2021 à 14:48, Halitim Bachir a écrit :
> Hi Dominique,
> I could not access the wiki.seismic-unix.org
> <http://wiki.seismic-unix.org> , any idea ?
> Thanks
>
>
> _______________________________________________
> seisunix mailing list
> seisunix(a)mailman.mines.edu
> https://mailman.mines.edu/mailman/listinfo/seisunix
> Unsubscribe: seisunix-unsubscribe(a)mailman.mines.edu
--
|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|
|Off: +33 559 407 423|Cell: +33 660 861 391|xmpp: dominique(a)rousset.nom.fr|
Good afternoon SU users
Just a reminder that if you are an academic institution youcan get a free academic license to Reveal for teaching and pure research.
What has this to do with Seismic Unix?
You can drop SU into Reveal and use all our tools with theSU tools, all in the same flow – the best of both.
Our academic licenses are free – get in touch if you areinterested and I would be happy to show you.
We have 30+ academic institutions using it around the worldbut would like to offer it to more – and I know this group has many academicsin.
Thanks
Aaron Lockwood
alockwood(a)shearwatergeo.com
Reveal Seismic Software // Shearwater GeoServices
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Reveal Seismic Software // Shearwater GeoServices
Shearwater Reveal provides time and depth processing and imaging for both land and marine environments from with...
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Hello everyone
I would like to apply a derivative to a signal. I made a test with a
simple cosine (created with suvibro) applying suop op=diff ... but I
didn't get a sine. Why? thanks in advance
-- luca
Hi,
I would build a command line in a text file and read it with the par=
option (common to all SU tools)
I assume that the shotnumbers are ep and strictly positive.
1) transform the column file into a line (shot numbers separated by a
comma) using
paste -sd , <columnshotfile >lineshotfile
add the accept= option at the beginning of the line (with a text editor
or script)
2) use
suwind key=ep max=0 par=lineshotfile <allshots.su >selectedshots.su
D.
Le 11/10/2020 à 08:51, Fateh Bouchaala a écrit :
>
> Dear all,
>
>
>
> With suwind command, I want to accept only some shots listed in a one
> column file (I have many files). How can I make suwind read directly
> from the file.
>
> I tried “suwind <sufile.su key=tracf max=0 accept=$file” however, it
> only reads the first shot’s id.
>
>
>
> I appreciate if you can help me.
>
>
>
> Dr. Fateh Bouchaala
>
> Assistant Professor
>
> Earth Science
>
> P O Box 127788, , UAE
>
> T +971 2 675 168
>
> F +971 2 447 2442
>
> fateh.bouchaala(a)ku.ac.ae
>
> ku.ac.ae
>
>
>
>
--
|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|
|Off: +33 559 407 423|Cell: +33 660 861 391|xmpp: dominique(a)rousset.nom.fr|
Dear all:
I have a file with crosscorrelation traces and I want to pick the times at the crosscorrelation peaks, one per trace.
Is there a program in SU that will allow me to do that? I know/guess a few programs do that internally for other things but I need one that gives me the times as output.
Thanks for any help
Gabriel
*******************************************
Gabriel Perez
Senior Geophysicist
+1-281-840-3766
gabrielperezpinilla(a)yahoo.com
Linkedin profile: www.linkedin.com/in/gabrielperezgeo
Hello all
About my Zero offset synthetic VSP data, I thought something but I am not
sure about the effect of this issue. If I get rid of the first three traces
from the data before picking arrivals (deleting or killing), and continuing
next process steps, that give rise to any effect for results? If not so,
How should I write for getting rid of these three traces?
I added my screenshot (plus signs denotes picking)
Thank you
Best
Erdi
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 everyone
John has set up a new 44 minor release of Seismic Unix (R19). Thank you
John !
It is available at https://wiki.seismic-unix.org
Enjoy SU
D.
--
|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|
|Off: +33 559 407 423|Cell: +33 660 861 391|xmpp: dominique(a)rousset.nom.fr|
There are a few bug fixes. I have put in a few epidemiological modeling codes in regard to our current situation with the Coronavirus. These items may be of interest for those teaching ordinary differential equations. Also, this modeling approach could be modified for oil and gas field production modeling.
John Stockwell
Visit: https://wiki.Seismic-Unix.org
The new home of Seismic Un*x
