[OpendTect_Users] Time-to-depth 2D horizons conversion with well sonic information

Fri May 3 10:30:18 CEST 2013

Hi Paul,

Thanks a lot for such good info, sorry for asking this but why this is not in the docs? I haven't found it. I do have the licenses for the plugins of version 4, they work with the 4.3 though. Bert and Jan as always were very helpful with that (as all of you of course), they provided me the licenses last year. Now I'm updating the current OD version (very cool interface by the way) and will see if the licenses work with it. So, I will test things here and will post some questions if they don't work.

Thanks again, keep the great work up!!

Best regards,

Gery

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Piensa en el medio ambiente - mantenlo en la pantalla. NO lo imprimas si NO es necesario.
Think green - keep it on the screen. Do NOT print if it is NOT necessary.
Denken Sie an die Umwelt - bewahren Sie es auf dem Bildschirm. Drucken Sie es NICHT, wenn es NICHT notwendig ist.

Date: Thu, 2 May 2013 18:04:11 +0200
Subject: Re: [OpendTect_Users] Time-to-depth 2D horizons conversion with well sonic information
From: paul.degroot at dgbes.com
To: gamejihou at hotmail.com
CC: users at opendtect.org

Hi Gery,
There are several tools in OpendTect to make life easier:There is an extensive Rock-physics library integrated in the "Manage Well" utility. Press on "Create..." and then on the little icon on the right-hand side of the first line. This will open the Rock-Physics window. Chose Velocity -> Velocity from Sonic. Press OK to generate a Velocity log in the units that you want (m/s).
In the Volume Builder you can build a velocity model that you can then use to convert any data from time-to depth. This can be done on-the-fly, or in batch. You want to use the option "horizon-based painter" several times. The velocities (or gradients) you can get from the velocity log that you have calculated. This step you need to do in a spreadsheet. 
Alternatively, if you have a HorizonCube (you need a commercial license for this) you can interpolate the well data along the horizons of the HorizonCube to create the velocity model.Good luck and best regards,

Paul.-- 
Paul de GrootPresident 
dGB Earth Sciences, Nijverheidstraat 11-2, 7511 JM Enschede, The Netherlands.Tel. +31 53 43 15 155, Fax +31 53 43 15 104.
paul.degroot at dgbes.com, www.dgbes.com, www.opendtect.org.

On Mon, Apr 29, 2013 at 2:35 PM, Gery . <gamejihou at hotmail.com> wrote:

Dear all,

I've read this post several times (http://lists.opendtect.org/pipermail/users/2011-July/000511.html) and played around with OD to do what I need but didn't find the way to do it. So please I would appreciate if someone has an easy way to do this with OD v4.3 or the current OD version.

This is the problem: I have a 2D seismic line in TWT and well sonic information in us/ft. After drawing some 2D horizons, I want to convert them to depth in meters. If I were use the procedure explained in the post mentioned above, I would need to provide manually the velocity for every horizon. This probably would not be a pain because I have only 8 horizons. However, I would need first to pick manually the sonic velocity for every horizon depth (probably using the 2D log viewer or some awk/grep/tail/etc trick in the LAS file) and then convert it to m/s (using this website http://home.online.no/~helgnil/calc1_4e.html or using just the conversion factor in shell/excel/etc).

So, I was wondering if it is possible to automagically assign to the desired horizon the corresponding well sonic velocity (in m/s) and then make the time-to-depth conversion, would it be possible?

I would appreciate some ideas, I mean, to avoid doing this manually, thank you.

Best regards,

Gery

__________________________________________________________________________________________
Piensa en el medio ambiente - mantenlo en la pantalla. NO lo imprimas si NO es necesario.

Think green - keep it on the screen. Do NOT print if it is NOT necessary.
Denken Sie an die Umwelt - bewahren Sie es auf dem Bildschirm. Drucken Sie es NICHT, wenn es NICHT notwendig ist.

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