[OpendTect_Users] Interval Velocity Conversion

[Colin Hawke]

Thanks. I didn't really explain the issue very well as I think it is impossible to do this workflow in a 3D OD "Time" project - this is a large project where all my seismic data and interpretation resides. So I've made a duplicate empty 3D OD project that is in "Depth" and has the exactly the sampling the depth SEGY file has (0-10000m in 5m depth steps). I think I can then do the depth->time conversion in this new "Depth" OD project and export the Velocity model in time and import to the "Time" project. I think it should work - I wasn't thinking laterally enough and was trying to do it all from the time domain.

Cheers, Colin

From: micenko at bigpond.com
To: colinhawke at hotmail.co.uk; users at opendtect.org
Date: Wed, 25 Apr 2012 18:54:53 +0800
Subject: Re: [OpendTect_Users] Interval Velocity Conversion

Hi ColinI would use the time-depth conversion option (Section 7.1.3 in the manual) for doing this. Without the velocity model builder plugin you can still make velocity volumes and do depth conversions. Without going into the full details the way I do it is: -          Import velocity functions-          Use volume builder to grid the functions and make a 3D volume-          Make an average velocity volume and / or interval velocity volume-          Time-depth conversion You already have a velocity volume so all you need is the last step. Mick PS you may need lots of RAMFrom: users-bounces at opendtect.org [mailto:users-bounces at opendtect.org] On Behalf Of Colin Hawke
Sent: Wednesday, 25 April 2012 6:25 PM
To: OPENDTECT USERS
Subject: [OpendTect_Users] Interval Velocity Conversion Dear Users,

I have been given a 3D PSDM Interval Velocity volume in SEGY format in depth with 5m sampling. I need this velocity model in two-way-time with 4ms sampling. Is there a way of converting from Depth to Time in Opendtect without using the Velocity Modelling plug-in (I don't have this plug-in)? I'm quite familiar with OD but can't seem to work this out.

Any help appreciated.

Thanks 

Colin Hawke 
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