non-linear Vibroseis sweeps

Oil and natural gas exploration -- geology and geophysics
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Michael_Seman
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non-linear Vibroseis sweeps

Post by Michael_Seman »

I came across a survey that used a "parabolic" sweep. I recall dB/octave sweeps were fairly common, to boost high frequencies. There was also a dB/Hz sweep, but it had phase locking issues due to the severe rate of change of frequencies. In recent years I have seen people advocating low-dwell sweeps rather than the high-dwell sweeps that were popular before. And there are some peddling adaptive sweeps that are customised for a particular target. I presume they are made by a piecewise-linear table, as many vibrator electronics have this option. It would get interesting for 4D surveys, when one has to recreate what was used before, hope they provide adequte details in the survey reports.
I am curious though, how does minimum-phase conversion go when tinkering with the spectrum like this?

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