[Seisunix] VSP Processing
jxchamberlain at candg.me.uk
Thu Aug 6 10:22:02 CEST 2020
Erdi - from your image it looks like you are generating the synthetic
data using a zero-phase wavelet but are then picking using a first-break
approach (assuming that the arrow represents the pick on the 4th trace).
I would suggest either picking on a peak using a threshold or modelling
using a minimum phase wavelet. As Rob says, you could shift the data
down with sushift but I suspect that the modelling has not created any
data before T=0 so this might not work.
Another alternative would be to set a negative start time in the
modelling if this is an option.
On 06/08/20 06:59, rob at xsgeo.com wrote:
> I would use sushift to delay the traces and then subtract the delay
> from the subsequent picks generated by sufbpickw
> *From:*Seisunix <seisunix-bounces at mailman.seismic-unix.org> *On Behalf
> Of *Erdi Apatay
> *Sent:* Wednesday, 5 August, 2020 11:30 PM
> *To:* seisunix at mailman.seismic-unix.org
> *Subject:* [Seisunix] VSP Processing
> Hello All
> I am trying to pick firstÂ break arrivals in Zero Offset VSP on the
> CrewesÂ toolbox and another software. My problem is that I start
> picking from 4th trace because I cannot see the first three traces
> when I look at my data, which results in wrong velocities.
> My data is passive zero-offset VSP data, utilizing ambient noise
> sources. I created this by using a modeling code.
> I added one of my data and the problem's screenshot
> Can I fix this on Seismic Unix?
> Seisunix mailing list
> Seisunix at mailman.seismic-unix.org
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Seisunix