Hi Manabu - I have a YouTube channel (Seismic Rocks LLC) ( https://www.youtube.com/channel/UCp66KhTgHf1V6KfEfH2OnnQ ) that has a video about importing SEG-Y files that require "remap":-  "Seismic Unix: Complicated SEG-Y Import" -  https://www.youtube.com/watch?v=1rHnxz5EkwI

Note that the description that goes with the video includes a link to a PDF of the same information. Regards, David . . . . . . . . . . . . . .

On Thursday, October 20, 2022 at 03:31:26 AM MDT, tanahashi.m@gmail.com wrote:

Dear Dominique,

Thank you for the reply to my question.

As  you suggested, I have to remap the inline and cross line numbers at #189-192 and #193-196 to the unused integer keyword.

I was also personally informed from my friend in Japan how to remap  trace header words during segyread.

segyread tape=Source3D.sgy remap=swdep,gwdep byte=189l,193l | suresamp rf=0.5|segyhdrs | segywrite tape=Output3D.sgy

The time resampled SGY data with inline and cross line numbers on #61-64 and #65-68 was obtained.

It is good enough to load resampled data into my interpretation system.

Thank you very much again.

Best regards,

Manabu Tanahashi

Tsukuba, Japan

From: Dominique ROUSSET dominique.rousset@univ-pau.fr Sent: Thursday, October 20, 2022 5:35 PM To: seisunix@mailman.seismic-unix.org Subject: [Seisunix] Re: How to handle trace header information?

Hi, In the SU format, the bytes you use for inline and cross line numbers are allocated to SU use (see sukeyword -o ; d2 and f2 are floats in SU). Bytes # 189-192 and # 193-196 are inline/crossline numbers in segy rev1 for 3D post stack data. SU is not 3D fully capable and  segywrite does not use them for segy rev0 output.

I tried this simple test.

suplane | sushw key=d2,f2 a=3,4  | segyhdrs | segywrite tape=plane.segy segyread tape=plane.segy | surange

tracl    1 32 (1 - 32) tracr    1 32 (1 - 32) offset   400 ns       64 dt       4000 d2       0.000000 f2       0.000000

:-(

I don't see any solution at the user level without modifying segywrite to introduce header remapping à la segyread.

Within SU, I suggest that you use other keywords to store the inline and cross line numbers (such as swdep/gwdep, 4 bytes integers) and apply header remapping to read the data in other software. Anyway, using bytes # 189-196 in SU will complicate data display.

suplane | sushw key=swdep,gwdep a=3,4  | segyhdrs | segywrite tape=plane.segy segyread tape=plane.segy | surange

tracl    1 32 (1 - 32) tracr    1 32 (1 - 32) offset   400 swdep    3 gwdep    4 ns       64 dt       4000

D.

Le 20/10/2022 à 01:35, tanahashi.m@gmail.com a écrit :

Dear all,

I have performed a time resample of some 500ns sampled 3D seismic data to 1ms intervals using the suresamp command as shown below, but was unable to transcribe the 189-192 bytes of the Inline and the 192-196 bytes of the crossline numbers.

segyread tape=Source3D.sgy|suresamp rf=0.5|segyhdrs|segywrite tape=Output3D_1ms.sgy

I solved this problem by using the ASCII input/output function for trace header on SeiSee, a free Windows software, to write out the header information of the original file and then write it into the header of the output file.

Is there a way to transcribe inline and crossline numbers using the SU function?

Manabu Tanahashi

Tsukuba, Japan

_______________________________________________Seisunix mailing list -- seisunix@mailman.seismic-unix.orgTo unsubscribe send an email to seisunix-leave@mailman.seismic-unix.org

-- |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%7C%7C%C2%A0%C2%A0 Off: +33 559 407 423                         Cell: +33 660 861 391    |_______________________________________________ Seisunix mailing list -- seisunix@mailman.seismic-unix.org To unsubscribe send an email to seisunix-leave@mailman.seismic-unix.org

Hi Manabu - I apologize for my late response ...

Thank you for your kind note.  The goal of my writings and YouTubes is to make something clear.  I am very glad I could do that for you regarding SEG-Y and SU trace header byte locations.

Regards, David . . . . . . . . . . . . . .

On Sunday, October 23, 2022 at 04:30:54 PM MDT, tanahashi.m@gmail.com wrote:

Dear David, Seismic Rocks, LLC

Thank you for the information on your lecture movies about Seismic Unix on youtube channel.  I now understand the meaning of #180 and beyond in the SEG-Y trace headers and how to identify and handle it.

Best regards,

Manabu Tanahashi

Tsukuba, Japan

From: David Forel davidforel@yahoo.com Sent: Saturday, October 22, 2022 3:12 AM To: seisunix@mailman.seismic-unix.org; dominique.rousset@univ-pau.fr; tanahashi.m@gmail.com Subject: Re: [Seisunix] Re: How to handle trace header information?

Hi Manabu -

I have a YouTube channel (Seismic Rocks LLC) ( https://www.youtube.com/channel/UCp66KhTgHf1V6KfEfH2OnnQ ) that has a video about importing SEG-Y files that require "remap":

-  "Seismic Unix: Complicated SEG-Y Import"

-  https://www.youtube.com/watch?v=1rHnxz5EkwI

Note that the description that goes with the video includes a link to a PDF of the same information.

Regards, David

. . . . . . . . . . . . . .

On Thursday, October 20, 2022 at 03:31:26 AM MDT, tanahashi.m@gmail.com wrote:

Dear Dominique,

Thank you for the reply to my question.

As  you suggested, I have to remap the inline and cross line numbers at #189-192 and #193-196 to the unused integer keyword.

I was also personally informed from my friend in Japan how to remap  trace header words during segyread.

segyread tape=Source3D.sgy remap=swdep,gwdep byte=189l,193l | suresamp rf=0.5|segyhdrs | segywrite tape=Output3D.sgy

The time resampled SGY data with inline and cross line numbers on #61-64 and #65-68 was obtained.

It is good enough to load resampled data into my interpretation system.

Thank you very much again.

Best regards,

Manabu Tanahashi

Tsukuba, Japan

From: Dominique ROUSSET dominique.rousset@univ-pau.fr Sent: Thursday, October 20, 2022 5:35 PM To: seisunix@mailman.seismic-unix.org Subject: [Seisunix] Re: How to handle trace header information?

Hi, In the SU format, the bytes you use for inline and cross line numbers are allocated to SU use (see sukeyword -o ; d2 and f2 are floats in SU). Bytes # 189-192 and # 193-196 are inline/crossline numbers in segy rev1 for 3D post stack data. SU is not 3D fully capable and  segywrite does not use them for segy rev0 output.

I tried this simple test.

suplane | sushw key=d2,f2 a=3,4  | segyhdrs | segywrite tape=plane.segy segyread tape=plane.segy | surange

tracl    1 32 (1 - 32) tracr    1 32 (1 - 32) offset   400 ns       64 dt       4000 d2       0.000000 f2       0.000000

:-(

I don't see any solution at the user level without modifying segywrite to introduce header remapping à la segyread.

Within SU, I suggest that you use other keywords to store the inline and cross line numbers (such as swdep/gwdep, 4 bytes integers) and apply header remapping to read the data in other software. Anyway, using bytes # 189-196 in SU will complicate data display.

suplane | sushw key=swdep,gwdep a=3,4  | segyhdrs | segywrite tape=plane.segy segyread tape=plane.segy | surange

tracl    1 32 (1 - 32) tracr    1 32 (1 - 32) offset   400 swdep    3 gwdep    4 ns       64 dt       4000

D.

Le 20/10/2022 à 01:35, tanahashi.m@gmail.com a écrit :

Dear all,

I have performed a time resample of some 500ns sampled 3D seismic data to 1ms intervals using the suresamp command as shown below, but was unable to transcribe the 189-192 bytes of the Inline and the 192-196 bytes of the crossline numbers.

segyread tape=Source3D.sgy|suresamp rf=0.5|segyhdrs|segywrite tape=Output3D_1ms.sgy

I solved this problem by using the ASCII input/output function for trace header on SeiSee, a free Windows software, to write out the header information of the original file and then write it into the header of the output file.

Is there a way to transcribe inline and crossline numbers using the SU function?

Manabu Tanahashi

Tsukuba, Japan

_______________________________________________Seisunix mailing list -- seisunix@mailman.seismic-unix.orgTo unsubscribe send an email to seisunix-leave@mailman.seismic-unix.org

-- |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%7C%7C%C2%A0%C2%A0 Off: +33 559 407 423                         Cell: +33 660 861 391    | _______________________________________________ Seisunix mailing list -- seisunix@mailman.seismic-unix.org To unsubscribe send an email to seisunix-leave@mailman.seismic-unix.org