importing multiple 3D surveys with different footprints

[Douglas Paton]

Hi there, I am guessing this question might have been asked somewhere before but I can't seem to find it in the discussion group. I am looking to have a single session or project with 3 seismic volumes plus some 2D data so I can interpret across them (they overlap spatially a little but have different footprints). I am not sure if I can do this or have to interpret in separate projects and then merge the interp? Any suggestions would be welcome. (I also have some 2D ties but they seem to come in quite easily)

Douglas

[Paul de Groot]

Hi Doug,

You can load multiple volumes with different vintages into a single survey. All volumes are mapped to the inline - crossline grid defined in the Survey setup window The only thing you need to ensure is that all volumes fit inside the defined inline - crossline grid. You load the first volume in the default way (on inlines - crosslines). All subsequent volumes are loaded on X,Y coordinates. These volumes are remapped to the nearest inline-crossline position. For details, please see the User doc Chapter 4.3.11.1.1 SEG-Y Wizard (bottom of the page).

Data specific options:

3D (pre- and poststack) data positioning can be based either on Inline/Crossline or X/Y coordinates of each trace:

• Use I/C (default): positioning of imported data is based on Inline/Crossline numbers, (X,Y) coordinates are therefore calculated from a survey setup.
• Use (X,Y): positioning of imported data is based on (X,Y) coordinates, Inline/Crossline numbers are therefore calculated from a survey setup. If Coordinate Reference System (CRS) is defined for the survey, CRS conversion will be available in the import window.

Best regards,

Paul.

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Paul de Groot

Geoscience Manager

-----------------------------------------------------------------------------------------------------------------------   dGB Earth Sciences
Phone: +31 53 4315155 E-mail: paul.d...@dgbes.com Internet: dgbes.com

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On Sat, May 8, 2021 at 8:57 PM Douglas Paton <dougla...@gmail.com> wrote:

Hi there, I am guessing this question might have been asked somewhere before but I can't seem to find it in the discussion group. I am looking to have a single session or project with 3 seismic volumes plus some 2D data so I can interpret across them (they overlap spatially a little but have different footprints). I am not sure if I can do this or have to interpret in separate projects and then merge the interp? Any suggestions would be welcome. (I also have some 2D ties but they seem to come in quite easily)

Douglas

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[Greg Samways]

Hi All,

 

I am looking forward to the answer to this one too!  My understanding was that it could be done, as long as all the data are in the same coordinate system.  But I never managed it!

 

Greg

 

Dr. Greg Samways – Geologist Adinvenio - Director   Email: gregs...@adinvenio.com Phone: +33 555 78 54 20 | Mobile: +33 641 91 26 74   SARL Adinvenio, 3 Joffreny, 87230 Bussiere Galant, France www.adinvenio.com  www.geolumina.org

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[Andrei Sinelnikov]

Dear users,

I have managed to load several surveys into one project by doing following (as suggested by OpendTect support couple of years ago):

Create separate OpendTect surveys - one per 3D cube. Open the main one (which shall cover the whole area of all intended surveys), and then you can import the 3D cubes from other surveys into this big one by using the 'From other survey' option under Import CBVS cube. This option will perform a transformation (if necessary) on the imported cube to the correct one for the survey into which it is being imported. If you noticed that the survey transformations differ slightly, then we recommend using Nearest trace algorithm. If the differences are big, it's better to opt for Sinc interpolation. Coordinate system of all surveys was the same, so I am not sure if it can do transformation in this case though. And be aware that Inline - x-line will be re-numbered.

Hope that helps.

Andrei

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[Douglas Paton]

Thanks Paul and everybody (sorry for slow response), as Andrei noted it needed the the footprint of the all of the survey in the first instance and then everything went in ok (although 2D lines out with this AOI can be imported). I did notice that on one survey which had a significant rotation to footprint it came through as being quite pixelated when viewed and also be aware that not only do Il-XL lines get renumbered,  for the volume with a different footprint rotation then IL-XL have a different orientation compared to initial volume as they are set by the new survey orientation.

Douglas

[Bandurao Naik]

Dear Sir

As of now there is no way to import more than one volume in OpenDtect. Even if we do as suggested by earlier user, the inline/xline will be renumbered for other volumes.

SBR Naik

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