Fowler DMO and time migration in transversely isotropic media
- Colorado School of Mines, Golden, CO (United States)
The main advantage of Fowler`s (1984) isotropic dip-moveout (DMO) method is the ability to perform velocity analysis along with the DMO removal. Here, the authors devise a Fowler-type DMO algorithm for transversely isotropic media using the analytic expression for normal-moveout velocity given by Tsvankin (1994). Alkhalifah and Tsvankin (1994) have shown that in transversely isotropic media with a vertical axis of symmetry (VTI), the P-wave normal-moveout (NMO) velocity as a function of ray parameter can be fully described by the zero-dip NMO velocity V{sub nmo}(0) and the anisotropic parameter {eta}. In their extension of Fowler DMO, resampling in the frequency-wavenumber domain makes it possible to obtain the values of V{sub nmo}(0) and {eta} by inspecting zero-offset panels for different pairs of the two parameters. Synthetic examples demonstrate that the isotropic Fowler DMO technique fails to generate an accurate zero-offset section and obtain the zero-dip NMO velocity for non-elliptical VTI models. In contrast, the anisotropic algorithm allows one to find the values of the parameters V{sub nmo}(0) and {eta}, and correct for the influence of transverse isotropy in the DMO processing.
- DOE Contract Number:
- FG02-89ER14079
- OSTI ID:
- 89733
- Report Number(s):
- CONF-941015--
- Country of Publication:
- United States
- Language:
- English
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