Title :
Prestack reverse-time migration of acoustic wave equations in VTI media
Author :
Linghe, Han ; Bingshou, He
Author_Institution :
Coll. of Marine Geosci., Ocean Univ. of China, Qingdao, China
Abstract :
Based on the first-order acoustic wave equations in vertical transversely isotropic (VTI) media [1], high-order finite-difference schemes for reverse-time extrapolation and the perfectly matched layer (PML) absorbing boundary condition for the equations are derived. Prestack reverse-time depth migration of acoustic wave equations in VTI media using excitation-time imaging condition by maximum amplitude criteria and normalized cross-correlation imaging condition is carried out. Numerical experiments of anisotropic Marmousi model show that prestack reverse-time depth migration of acoustic wave equations in VTI media has good imaging effect on complex models with steep dips and strong lateral velocity variation. Reverse-time migration imaging condition using normalized cross-correlation has better imaging effect. Additionally, the contrast between anisotropic and isotropic reverse-time migration profiles proves that better imaging results can be obtained using anisotropic migration algorithms for P-wave data acquired in anisotropic regions.
Keywords :
acoustic waves; finite difference methods; geophysical techniques; seismic waves; seismology; P-wave data; absorbing boundary condition; anisotropic Marmousi model; anisotropic migration algorithms; anisotropic regions; anisotropic reverse-time migration profile; excitation-time imaging condition; first-order acoustic wave equations; high-order finite-difference schemes; lateral velocity variation; maximum amplitude criteria; normalized cross-correlation imaging condition; perfectly matched layer; prestack reverse-time depth migration; quasiP wave equations; reverse-time extrapolation; reverse-time migration imaging condition; vertical transversely isotropic media; Acoustic waves; Equations; Geophysics; Imaging; Mathematical model; Media; Propagation; Marmousi model; VTI media; boundary condition; finite-difference; imaging condition; quasi-P wave equations; reverse-time migration;
Conference_Titel :
Geoscience and Remote Sensing (IITA-GRS), 2010 Second IITA International Conference on
Conference_Location :
Qingdao
Print_ISBN :
978-1-4244-8514-7
DOI :
10.1109/IITA-GRS.2010.5603265