How to carry out 3D horizon mapping on 2D window

[Abdulganiyu ABDULAI]

Hello,

Recently started using OpendTect and I am curious about the software's capabilities in working with GPR data. The software loads the 2D data quite alright but for some reason I can not add horizons in 3D and carry out some attribute extractions like amplitude or even work the volume builder. Kind guidance will much appreciated.

Warm regards.

Abdulai Abdulganiyu

[Hesham Refayee]

Hello Abdulai,

Yes, OpendTect does support the import of GPR data with the DTZ format. Regarding your question about 3D horizons, could you clarify if you have already imported the horizons but are unable to display them in the main menu of OpendTect?

Best regards

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Hesham Refayee

Senior Geoscientist

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[Abdulganiyu ABDULAI]

Hello Hesham,

Thank you for your email, the GPR data was imported in SEG-Y format in the 2D survey type. 

I successfully tracked horizons in 2D but trying to do so in 3D, I get the error "3D tracking cannot handle picks on 2D lines". Is there a way to track 3D horizons on 2D? I must be missing something or I am doing it all wrong.

Looking forward to hearing from you

Warm regards

Abdulganiyu Abdulai

[Hesham Refayee]

Hello Abdulai,

You need a 3D cube to track a horizon in a 3D.

Sent from my iPhone

On Jun 10, 2025, at 9:00 AM, Abdulganiyu ABDULAI <nysc...@geoterrainltd.com> wrote:



[Abdulganiyu ABDULAI]

Hello Hesham,

Thanks for your swift response once again, I would like to know if it is possible to create a 3D cube with GPR data and track horizons within the 3D cube on the 2D GPR line.

Because the purpose of this exercise is to attempt attribute extraction like amplitude on the loaded 2D GPR lines and on the interpreted horizons in OpendTect.

Please kindly assist

Warm regards 

Abduganiyu Abdulai

[Paul de Groot]

Allow me to clarify a bit further. OpendTect makes a distinction between 2D and 3D data. You can track 2D horizons and apply various other 2D tools only on 2D data. The same is true for 3D data and 3D tools. 

If you have 2D data, interpret 2D horizons and when you are done, use a gridding algorithm to convert the 2D horizon to a 3D horizon.

Best regards,

Paul.

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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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Op di 10 jun 2025 17:39 schreef Hesham Refayee <hesham....@dgbes.com>:

To view this discussion visit https://groups.google.com/a/opendtect.org/d/msgid/users/08CE6CE9-D006-48C9-9C64-D620D7C2E9E4%40dgbes.com.

[Abdulganiyu ABDULAI]

Thank you for the clarification, we have already mapped the horizon on the 2D GPR lines and gridded it into a 3D horizon using a seperate algorithm. My question right now is are there available 2D tools in OpendTect that will enable me to carry out amplitude extraction on the 3D gridded horizon based on the loaded 2D GPR lines.

An example of what we want to achieve is attached below.

[MICK]

I would try loading the 2d data as a 3D volume using the xy cords to locate the traces. You will have to create a 3D grid with the inline and cross line values to match your data.

The process for doing this has been described in this group many times in the past.

To view this discussion visit https://groups.google.com/a/opendtect.org/d/msgid/users/CAL04DrfQLwYQTOu71LsXUD%2B79OWO4ADoZCZ_pG%3D3TpVKFZC1qw%40mail.gmail.com.