Matched sweep method for seismic vibrators

作者：Wang Zhong Ren^*; Gao Jian; Lin Jun

来源：Chinese Journal of Geophysics, 2010, 53(11): 2754-2759.

DOI：10.3969/j.issn.0001-5733.2010.11.024

• Seismic vibrator
• Matched sweeping
• Side-lobe effect
• Correlation noises
• Seismic numerical simulation

Seismic response of conventional seismic vibrator driven by Chirp sweeping signals has the shortcomings of high side lobes and low resolution When binary pseudorandom coded signals are used as seismic vibrator drive signals, there are serious correlation noises in seismic response section, reducing the signal-noise ratio The matched sweep method for seismic vibrator put forward in this paper utilizes sine carrier signal modulated by matched pseudorandom sequence pair as seismic vibrator drive signal to sweep and excite, getting two matched original seismic records After the two matched original seismic records are decoded, they are stacked to the final integration decoded seismic section There are indications from results of seismic numerical simulation that the method basically does not have side-lobe effect of the conventional Chirp sweep case, which has effectively avoided correlation noises in m-sequence coded sweeping cases, and the final integration decoded seismic section can compare favorably with shot assembly records of pulse sources

• 出版日期2010-11
• 单位吉林大学