Coherence Seismic attribute and Spectral Decomposition

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Samuel Correa

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May 4, 2018, 4:13:21 PM5/4/18
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Hi,

I'm working with some 3-D Volumes at the Campos Basin, offshore Brasil and I'd like to make a 3-D horizon with the Coherence Attribute. So, can you help me to do this using OpendTect and solve this simple question? and my second question is: What's the better time-gate to do a Spectral Decomposition? Are there in literature some specific time-gate?

Thanks for your attention.

Kind Regards,
Geol. Samuel Correa
Programa de Pós-Graduação em Geociências - UFRGS
Área de Concentração em Estratigrafia
cel. (55) 98109-0561

Alessandro Menichino

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May 5, 2018, 12:19:26 AM5/5/18
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Hi Samuel,
I don’t have opendtect with me now. 
1) once that you create the attribute you can choose what to display on the horizon. 
2) I guess you mean the frequency that you what to display, no, you have to do a spectral analysis and choose the frequency. The time gate if you what to choose a particular depth (time) where to perform the special deconvolution. 

Kind regards
Alessandro

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Alessandro Menichino
Geophysical Consultant
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Emrah Can

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May 7, 2018, 3:27:11 AM5/7/18
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Samuel,

At least you may have an idea from a similar discussion posted at the Kingdom forum:

And, this paper may also give you some good insight:
Fracture Detection Interpretation Beyond Conventional Seismic Approaches
by Gary Jones and Rocky Roden, AAPG Poster Presentation (2012
http://www.searchanddiscovery.com/pdfz/documents/2012/41035jones/ndx_jones.pdf.html

Regards,
Emrah


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Arnaud Huck

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May 7, 2018, 3:49:26 AM5/7/18
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Dear All, Samuel,

Kindly find below the menu path for making a map from an attribute applied on a horizon:
Processing --> Create Horizon Output --> Attributes

That being said I would recommend you to ask yourself a few questions before doing that:

1- Is the interpretation snapped on a given seismic event, is it required by the attribute that has to be applied? If it is required but not already handled, considering snapping your interpretation first (if only to produce better attribute maps). You can do that from the Horizon right-click menu Tools --> Snapping

2- Does the interpretation have many holes that you do not want to display on the map: You may want to grid the interpretation before applying the attribute (Tools->Gridding). Or maybe you prefer to do that on the created map itself, because your seismic dataset has many holes?

3- Do you want the map to reflect your attribute only a the Z location of the interpretation, or would you rather have it (averaged) over a small time gate? In that case you need to use the Stratal Amplitude module (Processing --> Create Horizon Output --> Stratal Amplitude): A Z offset "Top: -4", "Bottom: 4" corresponds to a time gate [-4, 4] from an attribute definition (both relative to the actual interpretation pick, not the nearest sample).

4- Finally, because you do not want to waste your time: Is the input dataset pre-loaded in memory, provided that you have enough RAM to use that functionality (warning: only applies to on-the-fly calculations): menu Survey --> Pre-load --> Seismics?

Best regards,

Arnaud Huck
Chief Geophysicist
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Samuel Correa

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Jul 14, 2018, 1:50:48 AM7/14/18
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Hi Dear Huck,

Well, I have a simple question. What is the correspondent attribute to Envelope and RMS Amplitude of the Petrel in OpendTect. 
For example, according to the discussion that I having with my friends, the Similarity attribute in OpendTect is correspondent to Coherence in Petrel.
I await your contact.

Kind Regards, 

Geolist Samuel Correa
​
Graduation Program in Geoscience - UFRGS

Petroleum Geology Program

Alessandro

Skype: alessandro.menichino

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Il giorno 04 mag 2018, alle ore 22:34, Samuel Correa <scorre...@gmail.com> ha scritto:

Hi,

I'm working with some 3-D Volumes at the Campos Basin, offshore Brasil and I'd like to make a 3-D horizon with the Coherence Attribute. So, can you help me to do this using OpendTect and solve this simple question? and my second question is: What's the better time-gate to do a Spectral Decomposition? Are there in literature some specific time-gate?

Thanks for your attention.

Kind Regards,
Geol. Samuel Correa
Programa de Pós-Graduação em Geociências - UFRGS
Área de Concentração em Estratigrafia
cel. (55) 98109-0561
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MICK

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Jul 14, 2018, 3:51:02 AM7/14/18
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Whilst I’m not an expert at Petrel I would say the corresponding attributes in OD are called the same name.

There is an excellent attributes chart on the OD website.

Alessandro

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Il giorno 04 mag 2018, alle ore 22:34, Samuel Correa <scorre...@gmail.com> ha scritto:

Hi,

 

I'm working with some 3-D Volumes at the Campos Basin, offshore Brasil and I'd like to make a 3-D horizon with the Coherence Attribute. So, can you help me to do this using OpendTect and solve this simple question? and my second question is: What's the better time-gate to do a Spectral Decomposition? Are there in literature some specific time-gate?

 

Thanks for your attention.

 

Kind Regards,

Geol. Samuel Correa

Programa de Pós-Graduação em Geociências - UFRGS

Área de Concentração em Estratigrafia

cel. (55) 98109-0561

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chinmoy kumar

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Jul 14, 2018, 4:50:43 AM7/14/18
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Dear Samuel,
The correspondent attributes are:
Instaneous Amplitude which belongs to the set of instaneous attributes in OpendTect. It is same as the envelope you compute in Petrel. It is also sometimes called as the reflection strength.
For RMS amplitude you can compute using the volume statistics of Opendtect, where you take the amplitude data volume as your input and compute the statistics as RMS.

Regards,
Priyadarshi

Paul de Groot

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Jul 14, 2018, 4:57:57 AM7/14/18
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The OpendTect Attribute Matrix Mick Micenko refers to can be found here. For some reason there is currently no link from the dGB website to this Matrix but this will be restored shortly.

Best regards,

Paul.



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Il giorno 04 mag 2018, alle ore 22:34, Samuel Correa <scorre...@gmail.com> ha scritto:

Hi,

 

I'm working with some 3-D Volumes at the Campos Basin, offshore Brasil and I'd like to make a 3-D horizon with the Coherence Attribute. So, can you help me to do this using OpendTect and solve this simple question? and my second question is: What's the better time-gate to do a Spectral Decomposition? Are there in literature some specific time-gate?

 

Thanks for your attention.

 

Kind Regards,

Geol. Samuel Correa

Programa de Pós-Graduação em Geociências - UFRGS

Área de Concentração em Estratigrafia

cel. (55) 98109-0561

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Samuel Correa

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Jul 24, 2018, 1:59:04 AM7/24/18
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Hi Again,

So what's happen is that I don't know what's the best Scope and Algorithm for Grid my interpreted horizon in OpendTect. For example, this horizon was mapped sistematically in a regular grid of 25 x 25 (crossline x inline), but the final solution of my gridding processing is
a very irregular surface, that looks like with thousand of spikes and this result is not coherent, abolutelly. Please, I don't find in the OpendTect Training Manual and "How-To Instructions" what's the better algorithm and how or when I should use this one or those one.
I'd like that you can help me with my problem.

Kind Regards,

Geolist Samuel Correa
​
Graduation Program in Geoscience - UFRGS

Petroleum Geology Program

Priyadarshi


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Paul de Groot

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Jul 24, 2018, 4:42:46 AM7/24/18
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Hi Samuel,

Here is a personal ranking of gridding algorithms in OpendTect with some comments:
  1. Dip-Steered (you need to create a (dip-)steering cube you must have a dip-steering license). The advantage is that the grid is based on seismic evidence.
  2. Radial Basis Functions (is only available for gridding sparse data such as well markers; you need a Pro license).
  3. Continuous curvature: use the tension parameter to get a smooth looking grid.
  4. Triangulation: will work nicely with 25 x 25 line interpretation but deteriorates when points are sparse / distances are large.
  5. Inverse distance: the center of your 25 x 25 line interpretation will be the average of all points, hence the resulting grid appears to have ridges (along the interpreted lines) and valleys (in between).
  6. Extension: this option is used to create strip maps for 2D interpretations.
Best regards,

Paul.  

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Samuel Correa

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Jul 24, 2018, 10:19:40 PM7/24/18
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Hi Paul,

The great advantage is that I have the Academic License in the OpendTect, because I'm working with the OpendTect in my Master dissertation.
Thank's for you give me these steps, they was very important to me. Doing the gridding surface with triangulation Algorithm was terrible, and the final result of this surface is not precise. But in this time, doing exactly the same surface with
the dip steering algorithm, the result was completely different, more robust and with much more details at the surface, like channels and faults.

Again, thanks for your atention.
 
There' are some incongruences in the surface, but I think that I can improve this detail (please, see the figure attached where is the turdibite channel)

Kind Regards,

Geolist Samuel Correa
​
Graduation Program in Geoscience - UFRGS

Petroleum Geology Program

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Mike Cline

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Jul 25, 2018, 4:23:45 PM7/25/18
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Samuel,

Your interpretation artifacts are fairly common.

You could try these suggestions, located in Horizon>Tools, to fix them (save your output as a new horizon):

1) Horizon Snapping (eg. Event = nearest Peak, or Trough, and Search gate = +10/-10ms)

2) Horizon Filtering (eg. Filter Stepout = inl: 3, crl: 3)

You may need to experiment with the parameters, or cascade the results (cascaded smoothing, with small stepouts, sometimes works better than with one large stepout).

Good luck.



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Samuel Correa

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Jul 27, 2018, 12:51:40 PM7/27/18
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Hi Mike, thanks for your tips. 


    Dear Chinmoy Kumar, I'd like to talk a little bit more about the Seismic Attribute, and specifically, about the RMS Amplitude, Envelope and AVT.
So, how you can see in the images, the RMS Amplitude and Envelope of the seismic trace, when calculated in the OpendTect, have negative values, and for me, this is impossible because
the mathematic operations involved are fundamentally squares and modules, basically, don't should exist negative numbers. However, when I calculated the same attributes in the Petrel,
the result was that I expected, just positive values for RMS Amplitude and Envelope. Observe that the Cosine Phase and Instantaneous Phase have exactly the same response when
the attribute is calculated. I suspect that the setting that I'm using is the correct (see the figure Attributes _1).
Another interesting question that I have is: differently than we have in the literature about the AVT attribute, commonly composed by RMS Amplitude when applied the RMS Energy like input attribute,
the final result is much better than the RMS Amplitude (see figure Attributes_2). Perhaps because the RMS Amplitude is a smoothed signal caused by the root square?
So in this sense, the AVT could be composed by RMS Amplitude, Envelope, RMS Energy...I don't know if there are other.

Kind Regards,


Geolist Samuel Correa
​
Graduation Program in Geoscience - UFRGS

Petroleum Geology Program

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From: Samuel Correa <scorre...@gmail.com>
Date: Fri, 27 Jul 2018 13:18:53 -0300
Message-ID: <CABo0+pf9ncCyaVw7Tyu6uAZCShvRfPVyukyE=yNrNrc...@mail.gmail.com>

Subject: Re: [OpendTect_Users] Coherence Seismic attribute and Spectral Decomposition
To: us...@opendtect.org
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 Attribute_2.png
<https://drive.google.com/file/d/1-jfejJy0-qQUAlatPufmD7taFdfpt6-d/view?usp=
=3Ddrive_web>
Hi Mike, thanks for your tips.


    Dear Chinmoy Kumar, I'd like to talk a little bit more about the
Seismic Attribute, and specifically, about the RMS Amplitude, Envelope and
AVT.
So, how you can see in the images, the RMS Amplitude and Envelope of the
seismic trace, when calculated in the OpendTect, have negative values, and
for me, this is impossible because
the mathematic operations involved are fundamentally squares and modules,
basically, don't should exist negative numbers. However, when I calculated
the same attributes in the Petrel,
the result was that I expected, just positive values for RMS Amplitude and
Envelope. Observe that the Cosine Phase and Instantaneous Phase have
exactly the same response when
the attribute is calculated. I suspect that the setting that I'm using is
the correct (see the figure Attribute _1).
Another interesting question that I have is: differently than we have in
the literature about the AVT attribute, commonly composed by RMS Amplitude
when applied the RMS Energy like input attribute,
the final result is much better than the RMS Amplitude (see figure
Attribute_2). Perhaps because the RMS Amplitude is a smoothed signal caused
by the root square?
So in this sense, the AVT could be composed by RMS Amplitude, Envelope, RMS
Energy...I don't know if there are other.

Kind Regards,

IMPORTANT: The images were exported in high resolution (300 dpi), and they
have a big extension. I decided to do with this resolution to have a good
seismic visualization.

*Geolist **Samuel Correa*
=E2=80=8B
Graduation Program in Geoscience - UFRGS

Petroleum Geology Program
Phone: +55 (55) 98109-0561

On Wed, Jul 25, 2018 at 5:00 PM, Mike Cline <mi...@txresources.com> wrote:

> Samuel,
>
> Your interpretation artifacts are fairly common.
>
> You could try these suggestions, located in Horizon>Tools, to fix them (s=
ave

> your output as a new horizon):
>
> 1) Horizon Snapping (eg. Event =3D nearest Peak, or Trough, and Search ga=
te
> =3D +10/-10ms)
>
> 2) Horizon Filtering (eg. Filter Stepout =3D inl: 3, crl: 3)

>
> You may need to experiment with the parameters, or cascade the results
> (cascaded smoothing, with small stepouts, sometimes works better than wit=
h

> one large stepout).
>
> Good luck.
>
>
> W. Michael "Mike" Cline
> Consulting Geophysicist
> T/X Resources
> "Combining Technology with Petroleum Exploration Since 1985"
>
> Bus:  (713) 665-5449
> Info:  Brochure
> <http://www.txresources.com/W_Michael_Cline-TX_Resources_Brochure.pdf>,
> LinkedIn <https://www.linkedin.com/in/txresources>, Website
> <http://www.txresources.com>, and Blog
> <http://www.txresources.com/rocks2digits/>

>
> On 7/24/2018 2:57 PM, Samuel Correa wrote:
>
> Hi Paul,
>
> The great advantage is that I have the Academic License in the OpendTect,
> because I'm working with the OpendTect in my Master dissertation.
> Thank's for you give me these steps, they was very important to me. Doing
> the gridding surface with triangulation Algorithm was terrible, and the
> final result of this surface is not precise. But in this time, doing
> exactly the same surface with
> the dip steering algorithm, the result was completely different, more
> robust and with much more details at the surface, like channels and
> faults.
>
> Again, thanks for your atention.
>
> There' are some incongruences in the surface, but I think that I can
> improve this detail (please, see the figure attached where is the turdibi=
te
> channel)
>
> Kind Regards,
>
> *Geolist **Samuel Correa*
> =E2=80=8B

> Graduation Program in Geoscience - UFRGS
>
> Petroleum Geology Program
> Phone: +55 (55) 98109-0561
>
> On Tue, Jul 24, 2
----- Message truncated -----

Attributes_1.png
Attributes_2.png

Friso Brouwer

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Jul 27, 2018, 5:13:40 PM7/27/18
to us...@opendtect.org
Samuel,

Re. Petrel and OpendTect not giving the same results, w OpendTect apparently giving erroneous negative numbers as output - I quickly ran a test and I can not reproduce your outcomes in the latest version and the F3 dataset you have used as well. Is it possible to double check the colorbar and numerical ranges of the wiggle traces your display and include these in you images. Another easy way to verify the numerical range of an attribute is to use the histogram that can be accessed in the OpendTect tree. 

Re. the difference in your VTA attribute, I suspect you can attribute (no pun intended) that to the step-out setting in your volume statistics attribute, which involves a 'trace mixing' in a 3x3 box that causes the final output to be smoothed. Set the stepout to 0,0 and the output should be the same.

Cheers,

Friso



Friso Brouwer

Geophysical Consultant

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From: Samuel Correa <scorre...@gmail.com>
Date: Fri, 27 Jul 2018 13:18:53 -0300
Message-ID: <CABo0+pf9ncCyaVw7Tyu6uAZCShvRfPVyukyE=yNrNrcuK8-PQQ@mail.gmail.com>

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Samuel Correa

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Aug 12, 2018, 4:04:52 AM8/12/18
to us...@opendtect.org
Hi again,


My new question now is: How to remove footprints in a 3-D horizon in OpendTect (see FIGURE 1)?

Best Regards,

Geologist Samuel Correa
​
Graduation Program in Geoscience - UFRGS

Petroleum Geology Program
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FIGURE 1.png

Paul de Groot

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Aug 12, 2018, 4:14:48 AM8/12/18
to us...@opendtect.org
Hi Samuel,

Footprints can be removed with MGS-Destriping, a plugin by Estimages. MGS-Destriping uses a patented technique based on Factorial Kriging. It works on a slice-by-slice basis.

Commercial users can rent MGS-Destriping from the Pro-Store. Academic users have access through the Academic license program. 

Best regards,

Paul.


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Phone:+31 53 4315155
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Samuel Correa

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Aug 14, 2018, 3:11:54 AM8/14/18
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Hi Paul, 

I have the academic License, but I don't get complete this processing yet. I applied all steps, following rigorously the PDF's tips, but my final result looks like the original Seismic (FIGURE 1). I've created the Energy attribute (-200,200ms), and exported like a new 3-D Seismic Volume, named by RMS400, exactly like the PDF. The image with the artifacts doesn't are generated too. I'd like that you help me to solve this question.

Again, thanks a lot.

Kind Regards,

Geologist Samuel Correa
​
Graduation Program in Geoscience - UFRGS

Petroleum Geology Program

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FIGURE 1.png

Paul de Groot

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Aug 16, 2018, 6:04:40 AM8/16/18
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Hi Samuel,

I received this suggestion from Estimages:

If the plugin is used on the RMS400 volume, then only this volume will be destriped. No destriping will be run on other volumes, especially the seismic one. It may be the cause of the issue, if the Z-slice shown in the screenshot represents the seismic.

To have the seismic destriped, the user should select that volume and launch the process with the "Amplitudes" data option enabled.

I hope this helps. Best regards,

Paul.



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______________________________

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