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slimgroup / ImageGather.jl

Image gather tools
https://slimgroup.github.io/ImageGather.jl/
MIT License
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Foundamental questions about the package #5

Open kerim371 opened 1 year ago

kerim371 commented 1 year ago

Hi,

I'm getting interested in this package and don't have enough understanding how it works.

In seismic after migration we usually want to get migrated common offset or common angle gathers to make some postprocessing or AVO/AVA analisys. It seems JUDI's RTM can only result in stacked image, it is unable to get prestack migrated gathers. I guess this package tries to fix that: it allows to compute RTM while getting prestack migrated gathers right?

If so is it possible to get migrated common angle gathers for further AVA analisys?

mloubout commented 1 year ago

You can get a for gather by taking a radon transform if the offset gathers.

kerim371 commented 1 year ago

Right, thank you!

kerim371 commented 1 year ago

@mloubout is there a way to save data to disk in segy without storing all the computed data in RAM? In example I can only see storing result of computation in memory (var CIG).

mloubout commented 1 year ago

Image gather aren't easy to save as segy as they don't really have a segy structure so if you want to save them that way you may have to organize the traces yourself then write it to segy. At the moment yes, like for the standard RTM, there isn't a default segy writer for the result.