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- W2552306163 abstract "Summary Anis otropy in subsurface geological models is primarily caused by two factors: Sedimentation in shale/sand layers and fractures. The sedimentation factor is mainly modeled by Vertical Transverse Isotropy (VTI), whereas the fractures are modeled by a Horizontal Transversely Isotropic medium (HTI). In this paper we study hyperbolic and non-hyperbolic normal reflection moveout for a package of HTI/VTI layers, considering arbitrary azimuthal orientation of the symmetry axis at each HTI layer. We consider a local 1D medium, whose properties change vertically, with flat interfaces between the layers. In this case, the horizontal slowness is preserved; thus, the azimuth of the phase velocity is the same for all layers of the package. In general, however, the azimuth of the ray velocity differs from the azimuth of the phase velocity. The ray azimuth depends on the layer properties and may be different for each layer. In this case, the use of the Dix equation requires projection of the moveout velocity of each layer on the phase plane. We derive an accurate equation for hyperbolic and high-order terms of the normal moveout, relating the traveltime to the surface offset, or alternatively, to the subsurface reflection angle. We relate the azimuth of the surface offset to its magnitude (or to the reflection angle), considering short and long offsets. We compare the derived approximations with analytical ray tracing." @default.
- W2552306163 created "2016-11-30" @default.
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- W2552306163 date "2009-01-01" @default.
- W2552306163 modified "2023-09-25" @default.
- W2552306163 title "Moveout approximation for HTI / VTI layered media" @default.
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- W2552306163 doi "https://doi.org/10.1190/1.3255435" @default.
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