Filling in gaps without including areas lacking seismic data (undefined values)

[Carlos Amorim]

Hello everyone.

I'm working with a seismic cube and when drawing a horizon, I needed to fill in gaps using the Gridding tool. Currently, the filling includes areas without seismic data (undefined value). How can I fill only the areas with seismic data? Attached are screenshots to help clarify my question.

Thank you.

[José Olaya]

Dear Carlos,

There are options to interpolate 3D data in post-stack domain, I am not sure if Opendtect has any.

Otherwise, I will recommend reprocessing the data from field records, current state of the art 5D algorithms will allow you to interpolate data before migration then you will have the benefits of improving seismic imaging.

Cheers

Jose

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[Friso Brouwer]

For a simple case, with the non data area outside a continious data volume, like your image suggests, you can use a polygon to constrain the gridding area, or alternatively copy the horizon gridded over the survey area using a polygon to restrict the copy area.

If there are many holes inside the data volume itself the most convenient way to trim extraneous gridding is to use the attribute engine to 'delete' non seismic positions.

Cheers,

Friso

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[Paul de Groot]

There are even simpler methods to do what you want to do:

1. Convex hull option in the scope parameter of horizon gridding only grids inside the area with data;
   
2. Holes only (my personal favorite) checks for holes in the interpretation and grids holes smaller than a user-defined radius.

My personal favorite algorithm for gridding mapped horizons is "Continuous curvature" with a tension of 0.95.

@José Olaya: OpendTect Machine Learning library of pre-trained models contains two powerful models for interpolating holes / missing seismic traces: 

One model is trained to do just this. The other is trained to create super-resolution in the spatial direction (halving the bin-size).

Best regards,

Paul.

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Op za 14 feb 2026, 07:13 schreef Friso Brouwer <fr...@i3geo.com>:

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