Depth-varying Frequency Domain VSP Wavefield Deconvolution: Method and Application

Vertica seismic profiling (VSP) is a seismic exploration technique in which often features the receivers placed along the wellbore while the sources located at the surface. VSP signals include up/down-going P-waves, S-waves as well as converted-waves, scattering waves, multiple waves, etc. The suppression of VSP multiples is a crucial task in VSP data processing. the effectiveness of VSP multiple wave suppression directly affects the ability to identify thin reservoirs. it is necessary to study methods that can completely suppress VSP multiple waves. This abstract proposes a frequency domain depth-varying deconvolution method. By extracting wavelets at different depths in VSP data, frequency-domain wavelet shaping is achieved. The new method effectively suppresses multiples at various VSP depths, demonstrating superior suppression effectiveness compared to traditional approaches. The new deconvolution VSP records are free of multiples, which is more conducive to multiple identification and high-precision downhole imaging. Through the study of VSP frequency domain depth-varying deconvolution method, effective suppression of VSP multiple waves has been achieved, and ideal results have been obtained by processing simulated and actual VSP records. The frequency domain depth-varying VSP deconvolution method can effectively suppress VSP multiple waves, with better results than time-domain deconvolution.