Remove the moveout of azimuth anisotropy based on difference

Abstract

Due to the fast development of seismic exploration, azimuth anisotropy greatly attracts geophysicists’ attention; especially wide azimuth acquisition is extensively applied in recent years. It is well known that the traveling time variation with azimuth is main exhibition in seismic record due to the media anisotropy which enhances the difficulty of processing and influencing the identity of the small structure. In order to remove the effects of the azimuth anisotropy (traveling time), some geophysicists have carried out a great deal of research work and have already obtained obvious achievement, such as Lehmann et al.,1 removed azimuth moveout by velocity analysis based on azimuth gather. Tsvankin et al.,2 introduced coefficient of anisotropy in conventional velocity analysis. Alkhalifah et al (1998) introduced azimuth moveout (AMO) correction as a single operator to correct for azimuth variations (and dip) in homogeneous isotropic media. Rosales et al.,3 extended AMO operator to converted wave field. James4 removed the azimuth moveout by converted wave splitting estimation. In this paper, we introduce a new methoddifference to eliminate the azimuth moveout, this method is effective to improve the effect of azimuth anisotropy, more important it is easy to implement.