The use of pseudorandom sweeps to reduce interference noise in simultaneous Vibroseis surveys

Hayan Nasreddin; Timothy Dean; Kambiz Iranpour

doi:10.1071/ASEG2012ab256

ISSN: 2202-0586
E-ISSN:

oa The use of pseudorandom sweeps to reduce interference noise in simultaneous Vibroseis surveys
Authors Hayan Nasreddin^a, Timothy Dean^b and Kambiz Iranpour^c
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^a Curtin University, Perth, – WA, [email protected] ^b WesternGeco, Perth, – WA, [email protected] ^c WesternGeco, Oslo, – Norway, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2012, Issue ASEG2012 - 22nd Geophysical Conference, Dec 2012, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2012ab256
- Published online: 01 Dec 2012

Abstract

Summary

The cost of land seismic surveys is largely reliant on the total acquisition time. If the total acquisition time itself is limited then we may need to compromise the parameters used for the survey and thus the quality of the data acquired may be reduced. To overcome the productivity limitations associated with conventional Vibroseis acquisition, simultaneous shooting, where fleets of vibrators sweep at different locations at the same time, has been employed. Such methods typically require that the number of sweeps acquired at each source position is equal to the number of fleets, thus reducing any increase in productivity. Despite the use of such methods the data may still contain significant levels of noise contamination.

In this study we describe a new technique for generating sets of pseudorandom sweeps with cross-correlation attributes tailored to reduce interference noise. By using both synthetic and real data examples we show that such sweeps can significantly reduce the interference noise inherent in simultaneous shooting and thus have the potential to dramatically increase Vibroseis productivity without significantly affecting data quality.

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References

Bagaini, C., 2008, Low-frequency vibroseis data with maximum displacement sweeps: The Leading Edge, 27, 582-591`
Bagaini, C., 2010, Acquisition and processing of simultaneous vibroseis data: Geophysical Prospecting, 58, 81-100.
Bouska, J., 2010, Distance separated simultaneous sweeping, for fast, clean, vibroseis acquisition: Geophysical Prospecting, 58, 123-153.
Burger, P., & Baliguet, P., 1992, New vibrator control concept offers industrial use of pseudorandom sweeps in populated areas: 62nd Ann. Internat. Mtg. Soc. Explor. Geophys., 11, 687-689.
Cunningham, A. B., 1979, Some alternate vibrator signals: Geophysics, 44, 1901-1921.
Dean, T., Kristiansen, P., & Vermeer, P. L., 2010, High Productivity without Compromise - The Relationship between Productivity Quality and Vibroseis Group Size: 72nd EAGE Conference & Exhibition.
Goupillaud, P. L., 1976, Signal design in the “vibroseis” technique: Geophysics, 41, 1291-1304.
Howe, D., Foster, M., Allen, T., Taylor, B., & Jack, I., 2008, Independent Simultaneous Sweeping - a method to increase the productivity of land seismic crews: 78th Ann. Internat. Mtg. Soc. Explor. Geophys., 2826-2830.
Iranpour, K., Eriksson, S., & Hoerline, C. (2009). Generating sweep sequences: U. S. Patent 2009/0052278 A1
Krohn, C. E., & Johnson, M. L., 2003, High Fidelity Vibratory Seismic (HFVS) I: Enhanced data quality: 73rd Ann. Internat. Mtg. Soc. Explor. Geophys., 43-46.
Rozemond, H. J., 1996, Slip-sweep acquisition: 66th Ann. Internat. Mtg. Soc. Explor. Geophys, 64-67.
Sallas, J. J., Gibson, J. B., Lin, F., Winter, O., Montgomery, B., & Nagarajappa, P., 2008, Broadband Vibroseis using simultaneous pseudorandom sweeps: 78th Ann. Internat. Mtg. Soc. Explor. Geophys, 100-104.

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Article Type: Research Article

Keyword(s): Pseudorandom; simultaneous; sweep; Vibroseis

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