Ground-roll attenuation using polarization characteristics of complex vector seismic data

Abstract

As the primary source of noise in multicomponent seismic data, ground roll substantially contaminates the effective signals and reduces the signal-to-noise ratio of the seismic data. Therefore, ground-roll attenuation is an essential step in multicomponent seismic data processing. In this study, we develop a method to attenuate ground roll using a filtering method that preserves the polarization characteristics of the multicomponent seismic data. In this method, radial and vertical components of the multicomponent seismic data are combined into complex vector seismic data and then transformed from the t- x domain into the [Formula: see text]- f- v domain using S- and Radon transforms. The reciprocal ellipticity is calculated in the [Formula: see text]- f- v domain, and a polarization filter is designed according to the parameters of time, frequency, apparent velocity, and reciprocal ellipticity. Through polarization filtering, the ground roll of the multicomponent seismic data can be effectively attenuated. After performing the inverse Radon and S-transforms, the radial and vertical components of seismic data are obtained in the t- x domain without the ground roll. Tests on synthetic and field seismic data indicate that our method effectively attenuates the ground roll from the multicomponent data, providing better results than the established conventional methods.