[OpendTect_Users] Phase of the data

[Paul de Groot]

Dear Yoon keun,

The current development version OpendTect 4.3.1 supports a "Rotate phase"
option under the "Instantaneous" attributes. You can apply different phase
shifts to your seismic data and visually check the best match with a
reflectivity log. Attached is a low resolution image of a phase-rotated
seismic section that I compare with the reflectivity log (a high-resolution
image where you can read the text labels can be retrieved here:
ftp://ftp.dgbes.com/pub/Phase_Rotation.png ).

The well log display in this image is made with a new feature in 4.3.1. I
used the "Create log cube ..." option under the well menu. in this case a
5x5 traces cube around the well track was created and stored as a seismic
file. This new file was then displayed as a new attribute layer on inline
442.

Note 1: If you don't have a reflectivity log you can now create one from
available AI (or sonic & density) logs using the new Rock Physics module in
OpendTect. Go to "Manage Wells" and press "Create" to start the Rock
Physics module.

Note 2: In the current version you cannot use the "Evaluate Attribute"
option to compute N different phase rotations with say steps of 10 degrees.
This feature will be available in the next patch release.

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 Wed, May 23, 2012 at 5:33 AM, Yoon keun <geophysics.lab.md at gmail.com>wrote:

> Dear all,
>
> You may know how important is to know the phase of  the data you have
> prior to any further processing. Thus, I would like to ask how can one
> determine the phase of the data (esp. ) in the area of interest in
> OpendTect. I tried to do this by extracting a wavelet in my area of
> interest and just look at wavelet properties to know its spectrum and
> phase. I found that the phase (which is my objective) should be set in the
> extraction option's window !!!.
>  I believe there exist other ways to determine the data phase I don t
> know. I would be very grateful to anyone who has any comment or suggestion.
>
> Sincerely,
>
> Yoon
> Chonnam University
> Gwangju South Korea
>
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*
*
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