Schlumberger

Technical Paper: Establishing the Limits of Vibrator Performance - Experiments with Pseudorandom Sweeps

Society: SEG
Paper Number: 2012-221
Presentation Date: 2012
 

Abstract

Many methods have been developed over the last 50 years to generate pseudorandom sweeps for vibroseis sweeps, some of which have never before been tested. I give an overview of the different generation methods and their relative advantages and disadvantages. Tests showed that vibrators can struggle to emit some of these sweeps, particularly if they contain segments of the same polarity, sudden changes in instantaneous frequency, or small amplitude/high-frequency fluctuations. Although use of pseudorandom sweeps was initially promoted to improve the shape of the autocorrelation wavelet the most promising use is to reduce interference in simultaneous surveys.

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