Denoising Analysis and Processing Methods of Distributed Acoustic Sensing (DAS) Vertical Seismic Profiling (VSP) Data

Vertical Seismic Profiling (VSP) using Distributed Acoustic Sensing (DAS) technique has become a significant development direction for the borehole seismic survey because of its advantages of full-well coverage, high density, high efficiency, low cost, high temperature and high pressure resistance. This section of the book has mainly discussed DAS-VSP data denoising methods, analyzing the noise difference of data sets collected by different coupling methods of optical fiber cable and different optical cable structures in the well. It has also discussed the methods of subtracting the inverse coupling noise and eliminating the ringing noise, suppressing the random noise in the F-X domain, and improving the signal-to-noise (SRN) ratio by traces group combination. This paper proposed some denoising methods, which will greatly reduce the cable resonance interference and random interference noise. By applying these techniques, we were able to reduce DAS-VSP interference and significantly improve the SNR of the data while maintaining effective seismic wave integrity.