Summary Vibrator excitation is a cost-effective, high-quality, and environmentally friendly way to achieve a high-density, wide-azimuth seismic acquisition. However, since its excitation band is limited by mechanical properties, it is very challenging to get broadband seismic data using traditional vibrators and vibrator sweep signal design methods [ 1 – 3 ]. Moreover, the large sidelobes of sweep signal autocorrelation wavelets are associated with strong noise, which may degrade the quality of acquired data. According to a literature review, the industry has achieved certain research findings on improving vibrator excitation. For the use of conventional vibrators, nonlinear low-frequency sweep signals have gradually been popularized and employed. However, since the optimal combination of wavelet morphology, low-frequency energy, and bandwidth is not achieved, there is still an opportunity for improvement in data quality. Therefore, using the Riker wavelet, a damped Riker wavelet with very small wavelet side lobes and a broad frequency bandwidth was developed. In addition, the nonlinear sweep signals were designed by combining this wavelet with the low-frequency sweep signal design principle. Comparative data analysis indicated that the sweep signals designed by this method have a better excitation effect. 

Broadband Sweep Signal of Vibrator Design Technology Based on Damped Ricker Wavelet

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Broadband Sweep Signal of Vibrator Design Technology Based on Damped Ricker Wavelet