Pseudorelief Attribute

[Alex Francisco Antunes]

Hi,

It's nice to see that the Pseudorelief Attribute is now an official part of the OpendTect list of attributes. This makes OpendTect even better. In order to better understand how this fantastic attribute works and to get better results from it, I'd suggest two things:

(1) to include the work from Bulhões & Amorin (2005) (that firstly showed the usage of the attribute) and the paper from Vernengo & Trinchero (2015) (that goes deeper into the applications of the Pseudorelief attribute) in the reference list as seen for another attributes in OpendTec (e.g. Texture Attributes). Both papers can be found in ResearcheGate portal and the full citations are at the end of this message;

 

(2) To insert an option in the attribute window to permit the user to control the time gate, so that one can control de degree of vertical smoothing of the results.

The references mentioned are:

Bulhões, E. M., and Amorin, W. 2005. Princípio da sismocamada elementar e sua aplicação à técnica de volume de amplitudes (TecVa): Ninth International Congress of the Brazilian Geophysical Society (in Portuguese).

Vernengo, L., and Trinchero, E. 2015. Application of amplitude volume technique attributes, their variations, and impact. The Leading Edge, 34 (10), 1246-1253.

Best regards,

Alex Antunes.

________________________________________

Associate Professor

Geology Department

Universidade Federal do Rio Grande do Norte

[Paul de Groot]

Thanks Alex.

Claire Pierard (cc-ed) is hereby, as product-owner of the attributes part of OpendTect, requested to have the time-window control implemented.

I am afraid that I do not understand

​your

 other suggestion (the Bulhões and Amorin paper is in Portuguese).

​ 

Best regards,

Paul.

-- 

Paul de Groot

President

______________________________

dGB Earth Sciences
Phone:	+31 53 4315155
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[Alex Francisco Antunes]

Hi Paul,

Thank you for replying.

Here goes a translation to English of the title of Bulhões & Amorin (2005)’s paper:

"Principle of the elementary seismo-layer and its application to the amplitude volume technique (TecVa)”.

I can try to translate the whole paper to English if you want, but it’ll take some time.

Best regards,

Alex.

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[ptarso...@pq.cnpq.br]

Hello Paulo

he's referring to the TecVa attribute, invented a long long time ago (1990
decade) by
Elvio Bulhoes, a Petrobras geophysicist, and revealed to the community in two
congress papers (in portuguese), the original one in 1999, and the
aforementioned 2005 paper.

As I'm a newbie in your new attribute I don't know if they match.
I'm sending attached the 2005 paper, although it is in Portuguese, you can
follow the equations and most important see the results. The google translator
will generate an odd translation of the text, but still comprehensible.

Hope I could help, have a great new year.
Paulo T. L. Menezes

Quoting Paul de Groot <paul.d...@dgbes.com>:

> Thanks Alex.
>
> Claire Pierard (cc-ed) is hereby, as product-owner of the attributes part
> of OpendTect, requested to have the time-window control implemented.
>
> I am afraid that I do not understand
> ​your
> other suggestion (the Bulhões and Amorin paper is in Portuguese).
> ​
>
> Best regards,
>
> Paul.
>
>
> --

> *Paul de Groot*
> *President**______________________________*
>
> *dGB Earth Sciences*

> Phone: +31 53 4315155
> E-mail: paul.d...@dgbes.com
> Internet: dgbes.com & opendtect.org
>

> <http://opendtect.org/> SEG Distinguished Achievement Award 2016
> <http://opendtect.org/>
> *______________________________*

> > email to users+un...@opendtect.org.

> > To post to this group, send email to us...@opendtect.org.
> > Visit this group at https://groups.google.com/a/opendtect.org/group/users/
> > .
> > To view this discussion on the web visit https://groups.google.com/a/
> > opendtect.org/d/msgid/users/f2e1cd4e-b02c-4d49-80d4-32f07242d25d%40Spark
> >
>

<https://groups.google.com/a/opendtect.org/d/msgid/users/f2e1cd4e-b02c-4d49-80d4-32f07242d25d%40Spark?utm_medium=email&utm_source=footer>
> > .

> > For more options, visit https://groups.google.com/a/opendtect.org/d/optout
> > .
> >
>

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[Paul de Groot]

Thank you Paulo and Alex. I see that OpendTect's pseudo-relief with time-window control is equivalent to TecVa. So, the only thing we need to do is to add the time-window control.

Best regards,

Paul.

-- 

Paul de Groot

President

______________________________

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

 SEG Distinguished Achievement Award 2016

______________________________

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[SP2ONG-Waldek (sp2ong)]

Hi,

I use an attribute that is called "Pseudo Relief" in Opendtect but I always have to additionally perform a 180 rotation to have it as I use outside of Opendtect. Looking at the Opendtect sources it looks like it is after the Hilbert transformation a rotation of +90 degrees is applied. According to various descriptions it should rather be -90 degrees and now I understand why I have to additionally perform a 180 degree rotation attribute after the "Pseudo Relief" attribute

See the OpenDtect sources where is the line of code is where the application is 90 degrees and not -90 degrees
https://github.com/OpendTect/OpendTect/blob/2a6ceedc9fe2b75e0d6449acef4b7f6444b0a9af/src/uiAttributes/uireliefattrib.cc#L219

and the descriptions of TecVA, which in Opendtect is called "Pseudo Relief"

https://www.researchgate.net/publication/357457810_Modeling_of_reservoir_properties_using_seismic_attributes_and_evaluation_of_well_logs_a_case_study_in_Bauna_and_Piracaba_Oil_Fields_Santos_Basin_Brazil
https://help.dugeo.com/m/faq/l/742732-calculate-a-pseudo-relief-attribute-tecva

in which the authors state that a rotation of -90 degrees is used, not 90 degrees.
Of course, this is a small thing, but using -90 degrees of rotation we have exactly the same result as shown in the publications

Regards

Waldek

[Nanne Hemstra]

Dear Waldek,

Thank you for pointing out that our Pseudo Relief attribute applies a +90 degrees phase rotation, whereas the technical article recommends a -90 degrees rotation.

We've made the required changes to our code: https://github.com/OpendTect/OpendTect/commit/513380a37a29db5470e05fc1ff605a62d4f0c965

Best regards,

Nanne

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