[OpendTect_Users] Calculating sonic logs using neural nets
Jerome Coggins
jlc at cogginsgeosciences.com
Wed Jul 27 20:33:49 CEST 2011
Alex,
I have a few suggestions in addition to those already given.
1. Create the sonic for each lith separately.
2. Keep pay and wet sands separate.
3. Often a sonic-density cross plot per lith and fluid it the best approach. GGG is a global trend - your own local trend should be much better.
Regards,
Jerry Coggins
Sent from my iPad
On Jul 27, 2011, at 10:35 AM, users-request at opendtect.org wrote:
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> Today's Topics:
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> 1. Well logs and neural networks. (Alex Antunes)
> 2. Re: Well logs and neural networks. (Gordon, Andres Cesar)
> 3. Re: Well logs and neural networks. (Christopher P. Ross)
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>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 27 Jul 2011 12:13:58 -0200
> From: "Alex Antunes" <alex at geologia.ufrn.br>
> Subject: [OpendTect_Users] Well logs and neural networks.
> To: users at opendtect.org
> Message-ID: <20110727140912.M65064 at geologia.ufrn.br>
> Content-Type: text/plain; charset=iso-8859-1
>
> Hello everybody,
>
> I'm needing to compute a sonic log in a well that doesn't have it, but I don't
> want to use the Gardner's approximation.
>
> I think that this is possible to perform by using the neural networks in
> OpendTect, using a sonic log plus a set of other logs from a reference well,
> but I didn't find any tip on it in the OD documentation.
>
> Does anyone know how to do it?
>
> Regards,
>
> Alex Antunes.
>
> Prof. Alex Francisco Antunes
> Geologia Estrutural e Interpreta??o S?smica
> Laborat?rio de Geologia e Geof?sica de Petr?leo
> Depto. Geologia - Prog. P?s-Grad. Geodin?mica e Geof?sica / UFRN
>
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 27 Jul 2011 11:42:29 -0300
> From: "Gordon, Andres Cesar" <Andres.Gordon at ElPaso.com>
> Subject: Re: [OpendTect_Users] Well logs and neural networks.
> To: Alex Antunes <alex at geologia.ufrn.br>, "users at opendtect.org"
> <users at opendtect.org>
> Message-ID:
> <5A61807A68DC26418832DC56F8E35C9B18906F331F at CORRIOEXS671M.corp.epec.com>
>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi Alex, I did in the past and work very fine for me but you need several wells in the area and several logs.
> You need to have a neural network software and you need to train the network using several logs in wells that you have sonic (for example, SP, GR, DENSITY, NPHI, PEF, SONIC, RESISTIVITIES) and all the existing logs that are present in all the wells. After training the network, you can apply the found relationship to the unknown well. If you have many wells to train and several logs in those wells this methodology works fine
> Regards
> Andres
>
>
> -----Original Message-----
> From: users-bounces at opendtect.org [mailto:users-bounces at opendtect.org] On Behalf Of Alex Antunes
> Sent: quarta-feira, 27 de julho de 2011 11:14
> To: users at opendtect.org
> Subject: [OpendTect_Users] Well logs and neural networks.
>
> Hello everybody,
>
> I'm needing to compute a sonic log in a well that doesn't have it, but I don't want to use the Gardner's approximation.
>
> I think that this is possible to perform by using the neural networks in OpendTect, using a sonic log plus a set of other logs from a reference well, but I didn't find any tip on it in the OD documentation.
>
> Does anyone know how to do it?
>
> Regards,
>
> Alex Antunes.
>
> Prof. Alex Francisco Antunes
> Geologia Estrutural e Interpreta??o S?smica Laborat?rio de Geologia e Geof?sica de Petr?leo Depto. Geologia - Prog. P?s-Grad. Geodin?mica e Geof?sica / UFRN
>
>
>
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> ------------------------------
>
> Message: 3
> Date: Wed, 27 Jul 2011 10:33:14 -0500
> From: "Christopher P. Ross" <cross at crossqi.com>
> Subject: Re: [OpendTect_Users] Well logs and neural networks.
> To: "Gordon, Andres Cesar" <Andres.Gordon at ElPaso.com>
> Cc: "users at opendtect.org" <users at opendtect.org>
> Message-ID: <4E302FBA.6040906 at crossqi.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi Alex,
>
> As Andres has said, the way to do this is with multiple wells. I am not
> sure if OpendTect will do this, but I do this all the time with other
> software when I am missing key logs or log intervals and I have
> sufficient wells with sufficient logs acquired.
>
> Chris
>
> On 7/27/2011 9:42 AM, Gordon, Andres Cesar wrote:
>> Hi Alex, I did in the past and work very fine for me but you need several wells in the area and several logs.
>> You need to have a neural network software and you need to train the network using several logs in wells that you have sonic (for example, SP, GR, DENSITY, NPHI, PEF, SONIC, RESISTIVITIES) and all the existing logs that are present in all the wells. After training the network, you can apply the found relationship to the unknown well. If you have many wells to train and several logs in those wells this methodology works fine
>> Regards
>> Andres
>>
>>
>> -----Original Message-----
>> From: users-bounces at opendtect.org [mailto:users-bounces at opendtect.org] On Behalf Of Alex Antunes
>> Sent: quarta-feira, 27 de julho de 2011 11:14
>> To: users at opendtect.org
>> Subject: [OpendTect_Users] Well logs and neural networks.
>>
>> Hello everybody,
>>
>> I'm needing to compute a sonic log in a well that doesn't have it, but I don't want to use the Gardner's approximation.
>>
>> I think that this is possible to perform by using the neural networks in OpendTect, using a sonic log plus a set of other logs from a reference well, but I didn't find any tip on it in the OD documentation.
>>
>> Does anyone know how to do it?
>>
>> Regards,
>>
>> Alex Antunes.
>>
>> Prof. Alex Francisco Antunes
>> Geologia Estrutural e Interpreta??o S?smica Laborat?rio de Geologia e Geof?sica de Petr?leo Depto. Geologia - Prog. P?s-Grad. Geodin?mica e Geof?sica / UFRN
>>
>>
>>
>> _______________________________________________
>> Users mailing list
>> Users at opendtect.org
>> http://lists.opendtect.org/mailman/listinfo/users
>> ******************************************************************
>> THIS E-MAIL AND ANY MATERIALS TRANSMITTED WITH IT MAY CONTAIN CONFIDENTIAL OR PROPRIETARY MATERIAL FOR THE SOLE USE OF THE INTENDED RECIPIENT. ANY REVIEW, USE, DISTRIBUTION OR DISCLOSURE BY OTHERS IS STRICTLY PROHIBITED. IF YOU ARE NOT THE INTENDED RECIPIENT, OR AUTHORIZED TO RECEIVE THE INFORMATION FROM THE RECIPIENT, PLEASE NOTIFY THE SENDER BY REPLY E-MAIL AND DELETE ALL COPIES OF THIS MESSAGE.
>> ******************************************************************
>>
>>
>>
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>> Users mailing list
>> Users at opendtect.org
>> http://lists.opendtect.org/mailman/listinfo/users
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>
> --
>
> Cross QI Cross QI Cross QI Christopher P. Ross
> 830.896.7656
>
> /"Survivors seem to function best, when peril is at hand." (J. Buffett,
> 2004) /
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