Open AccessAnisotropic migration weight for amplitude‐preserving migration and sensitivity analysis
Author(s) -
Kiyashchenko D.,
Kashtan B.,
Plessix R.E.
Publication year - 2004
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.2004.02242.x
Subject(s) - amplitude , anisotropy , isotropy , offset (computer science) , azimuth , seismic migration , mathematical analysis , geology , mathematics , geometry , physics , optics , geophysics , computer science , programming language
SUMMARY An amplitude‐preserving anisotropic migration formula is derived in this paper. The migration is viewed as a weighted diffraction stack and the migration weights are estimated with the stationary phase theorem. To obtain a formula easy to implement, the weights are written in terms of quantities computable along the rays. A sensitivity analysis is then carried out to show that, in the vertical transverse isotropic case, the amplitude‐preserving migration is mainly governed by two parameters: the anisotropic NMO velocity and the parameter η. These parameters can be estimated from the data with a velocity (background) analysis. Therefore, it is possible to use this amplitude‐preserving anisotropic migration to recover the correct amplitudes versus offset or azimuth in the migrated image.