Fast 3-D seismic modeling and prestack depth migration using generalized screen methods. Final report for period January 1, 1998 - December 31, 2000

Toksoz, M. Nafi

Massachusetts Institute of Technology, Cambridge, MA (United States)

关键词: 99 General And Miscellaneous//Mathematics, Computing, And Information Science;    Backscattering;    Simulation;    Stability;    Velocity;   

DOI  :  10.2172/771245
RP-ID  :  NONE
RP-ID  :  FG02-98ER14846
RP-ID  :  771245

美国|英语

来源: UNT Digital Library

【 摘 要 】

Completed a theoretical analysis of phase screen propagators to answer several critical questions: the existence of a singularity in the Green's function for the case of a zero vertical wavenumber, the stability and accuracy of such propagators, and the effects of backscattering for large contrast heterogeneous media. The theory is based on separating the wavefield into forescattering and backscattering parts. The approach is robust and appropriate for earth structures with high velocity contrast. This theory also resolves the apparent singularity problem that has persisted in generalized screen propagator formulations. With this formulation we studied the effects of the commonly used approximations as a function of the degree of velocity contrast in the media.