Partial Angle Stack Generation

[gor...@multi-physics.com]

Hello!

 

Is there a workflow to generate partial angle stacks in OpendTect from offset gathers and interval velocities? I see an angle mute option, but can’t seem to find a way to stack the muted gathers into an angle stack.

 

Thank you.

 

Gorka

 

 

 

Gorka Garcia Leiceaga, gor...@multi-physics.com

Senior Geophysicist

Multi-Physics Technologies

Tel: +1 713 561 3831; Cell: +1 832 273 3966

 

[Paul de Groot]

Hi Gorka,

The workflow you are looking for is available under "Pre-stack" attributes. You can convert offset gathers to angle gathers and optionally apply pre-processing steps such as mutes, scaling, or super-gathers. From there, you can define the angle range and set the Calculation type to "Statistics" (to output stack, median, min, max, etc.) or "AVO attributes" (for Intercept, Gradient, or derivatives).

Please note that while you can generate these outputs in the community version of OpendTect, angles are computed using a basic ray tracer. For higher-quality results, OpendTect Pro features a commercial-grade ray tracer.

Best regards,

Paul.

--

Paul de Groot

Special Adviser

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

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[gor...@multi-physics.com]

Hi Paul,

 

Thank you for your response.

 

I tried creating a near stack on a 87 km2 prestack volume, and the estimated time to complete was 14 days!

 

I will look into this further and cut the volume to 4 seconds instead of 5 second TWT since there is not data below 4 seconds.

 

Thanks again.

 

Gorka

 

From: Paul de Groot <paul.d...@dgbes.com>
Sent: Thursday, January 22, 2026 2:32 PM
To: us...@opendtect.org
Subject: Re: [OpendTect_Users] Partial Angle Stack Generation

 

Hi Gorka,

 

The workflow you are looking for is available under "Pre-stack" attributes. You can convert offset gathers to angle gathers and optionally apply pre-processing steps such as mutes, scaling, or super-gathers. From there, you can define the angle range and set the Calculation type to "Statistics" (to output stack, median, min, max, etc.) or "AVO attributes" (for Intercept, Gradient, or derivatives).

 

Please note that while you can generate these outputs in the community version of OpendTect, angles are computed using a basic ray tracer. For higher-quality results, OpendTect Pro features a commercial-grade ray tracer.

 

Best regards,

 

Paul.

 

--

Paul de Groot

Special Adviser

To view this discussion visit https://groups.google.com/a/opendtect.org/d/msgid/users/CABuvx8EmjWu%2BCC6g7kULzwY8BvWWsSnZCmy1pzBbx-08%3DzfZAg%40mail.gmail.com.

[Mark Crawford]

Hi Gorka,

All of our attributes are capable of being processed via both Distributed Computing and via a Cluster.

The relevant documentation can be found here: https://doc.opendtect.org/7.0.0/doc/od_userdoc/Default.htm#processing/batch_processing.htm

You'll have to choose the method depending on the resources you may have available, but Cluster processing is the most efficient method by some degree.

Let me add a note about Cluster processing: 

The most efficient method is to set up a group of Linux processing nodes, with a cluster work manager like SLURM.

Only such setup can make full usage of the parallelization for the heavy processing of attributes  

Set up the SLURM service the usual way and make sure the daemon is running on the client machines.

When you choose the Cluster Processing option in OpendTect (for instance, 'Create SteeringCube' or 'Create Single-Volume Attribute'), it will ask you for the command to submit a job, e.g. sbatch, srun etc along with all the command line arguments.

I hope this helps - please get back to us if you need any further information.

You may also want to take a look at Raman's post on this from just over a year ago: https://www.linkedin.com/posts/marieke-van-hout-de-groot-2034a315_opendtect-clustercomputing-spectraldecomposition-activity-7237412972153774080-9-GJ/

Kind regards,

Mark

Mark Crawford

Support Manager

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

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To view this discussion visit https://groups.google.com/a/opendtect.org/d/msgid/users/00b701dc8bdf%24a1cae9b0%24e560bd10%24%40multi-physics.com.