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Hi all,

I am having trouble with understanding my seismic polarity. Several of my vintages that I use seem to be phaseshifted 180 degrees. I know several (two) types of colouring (negative and positive) conventions are used. The Shell convention and the SEG or something. Are they processed differently or is a simple phase shift in order??

And how does the input wiggle relate to this polarity (zero phased??). I have had this in university, but can;t seem to remember the details. Any documents/explanation on this would be very much appreciated.

Thanks,

Carl

I believe this is what you're looking for. The Shell and SEG polarity conventions can indeed be quite confusing. Let me know if this helped!