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

[Paul de Groot]

Hi Gery,

There are several tools in OpendTect to make life easier:

   1. 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).
   2. 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.
   3. 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 Groot
President
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
>
>
>
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