Visco-acoustic Wave Equation Migration

Conventional migration methods have been being limited in its imaging ability due to without consideration of absorption and dispersion of subsurface medium. Thus it is difficult for them to very precisely image subsurface structures. Also the amplitude of image can not correctly indicate the changes of lithological and physical properties. In this paper, seismic absorption and dispersion is considered when a migration extrapolation operator is computed, and also compensated during the wave extrapolation. extrapolation operator is obtained by a nonlinear optimization along with a linear optimization. With this method, the operator can be of stability and accuracy. The processing on numerical models and field seismic data show that, in comparison with traditional acoustic wave migration algorithms, the migration with absorption compensation algorithm can get more correct and accurate subsurface image.