The design of optimized broadband vibroseis sweeps
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There is currently much work being done to improve the low-frequency content of land vibroseis data. Although techniques exist for designing sweeps that can extend the bandwidth down to as low as 1 Hz, the inclusion of these frequencies comes at considerable cost, either in the time taken to acquire a sweep or in the reduction of the total sweep energy. We describe the limitations on vibrator performance and how those limitations can be overcome using specialized sweep-design techniques. Perhaps more importantly, we describe how such sweeps can be optimized in terms of maximizing their energy content and verifying their performance.
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Strahan, A.; Burnett, A.; Caneiro, Joao; Doyle, M.; O'Sullivan, Peter; Goodman, C. (2011)Objective: The spinopelvic kinematics of sweep and scull have yet to be investigated, despite evidence suggesting that sweep rowing may be provocative for low back pain (LBP). The aim of this study was to determine whether ...
Dean, Timothy; Tulett, J.; Lane, D.; Puckett, M.; Vermeer, P.; MacDonald, S.; Iranpour, K. (2015)© 2015 SEG.The use of pseudorandom sweeps has received periodic attention over the last 45 years. Previous testing has indicated that hydraulic vibrators may struggle to transmit such sweeps due to their rapid variation ...
Dean, Tim; Iranpour, K.; Clark, M.; Poole, A. (2016)A significant drawback of the use of hydraulic vibrators as the source for land seismic surveys is the contamination of their transmitted signal with harmonics. The variphase technique involves transmitting multiple sweeps ...