Vatmin

[M T]

Is there a way to create a horizon that snaps to the maximum negative amplitude sample between two other horizons?

The inputs would be Horizon A and Horizon B, and the output would be Horizon C that is located between the two. Horizon C would be snapped to the largest negative amplitude between the two. 

I see that there is a way to do this with a time/distance gate above and below a certain horizon, but that's not quite what I'm after.

This would be useful when looking for amplitude anomalies within a seismic stratigraphic sequence.

Thanks,

Mike

[Paul de Groot]

Hi Mike,

In the commercial version you could create a model-driven proportional HorizonCube between the two mapped horizons. This requires a Pro license + HorizonCube plugin. Alternatively, this could be done by tracking all three horizons simultaneously with the Inversion+ tracker. This tracker combines inversion-based flattening of the dip field with snapping to an event. Moreover, the algorithm ensures that simultaneously tracked horizons never cross each other. This tool is supported in the dip-steering plugin of OpendTect Pro.

However, what you want to do can also be done in OpendTect, the community version. It's a bit more laborious but here is how:

1. Define three attributes: 
1. Hortop and Horbase are of type "Horizon" and return the Z value of top and base horizons, respectively
2. Hortopshifted is of type "Mathematics" with this equation: Hortop + (Horbase - Hortop)/2
2. Apply attribute Hortopshifted to the top horizon and save as "horizon data"
3. Export the top horizon with the saved Hortopshifted horizon data attribute
4. Import the exported horizon with Hortopshifted as Z value
5. Snap the imported horizon to the event using the snapping tool in the tree menu.

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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