地震学报2011，Vol.33Issue(2)：209-218,10.DOI:10.3969/j.issn.0253-3782.2011.02.008
VTI介质中准P波方程叠前逆时深度偏移
Prestack reverse-time depth migration of quasi-P wave equations in VTI media
摘要
Abstract
On the basis of first-order quasi-P wave equations in transversely isotropic media with a vertical symmetry axis (VTI), high-order finite-difference schemes in staggered-grid for reverse-time extrapolation were derived. The stability condition and the perfectly matched layer (PML) absorbing boundary condition for the equations were also provided. Prestack reverse-time depth migration of quasi-P wave equations in VTI media using maximum amplitude method of down-going wave-field and normalized cross-correlation imaging conditions was carried out. Numerical experiments of anisotropic Marmousi model show that prestack reverse-time depth migration of quasi-P wave equations in VTI media has no dip restriction or lateral velocity variation restriction, and has good imaging effect for complex models. Reverse-time migration imaging condition using normalized cross-correlation has better imaging ability. Additionally,the contrast between the imaging results of anisotropic and isotropic reversetime migration profiles proves that theoretically better imaging results can be obtained using anisotropic migration scheme for P-wave data acquired in anisotropic regions.关键词
VTI介质/准P波方程/逆时偏移/有限差分/边界条件/成像条件/Marmousi模型Key words
VTI media/ quasi-P wave equations/ reverse-time migration/ finite difference/ boundary condition/ imaging condition/ Marmousi model分类
天文与地球科学引用本文复制引用
韩令贺,何兵寿,张会星..VTI介质中准P波方程叠前逆时深度偏移[J].地震学报,2011,33(2):209-218,10.基金项目
国家自然科学基金项目(40804021)、国家自然科学重点基金项目(40839901)、国家重点基础研究发展计划(973)项目(2009CB219603)和国家高技术研究发展计划(863)项目(2008AA092302)资助. （40804021）
