Feasibility of nonhyperbolic moveout inversion in transversely isotropic media
- Colorado School of Mines, Golden, CO (United States)
Inversion of reflection traveltimes in anisotropic media can provide estimates of anisotropic coefficients required for seismic processing and lithology discrimination. Nonhyperbolic P-wave moveout for transverse isotropy with a vertical symmetry axis (VTI media) is controlled by the parameter {eta} (or, alternatively, by the horizontal velocity V{sub hor}), which is also responsible for the influence of anisotropy on all time-processing steps, including dip-moveout (DMO) correction and time migration. Here, the authors recast the nonhyperbolic moveout equation, originally developed by Tsvankin and Thomsen, as a function of V{sub hor} and normal-moveout (NMO) velocity V{sub nmo} and introduce a correction factor in the denominator that increases the accuracy at intermediate offsets. Then they apply this equation to obtain V{sub hor} and {eta} from nonhyperbolic semblance analysis on long common midpoint (CMP) spreads and study the accuracy and stability of the inversion procedure.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 619626
- Journal Information:
- Geophysics, Journal Name: Geophysics Journal Issue: 3 Vol. 63; ISSN GPYSA7; ISSN 0016-8033
- Country of Publication:
- United States
- Language:
- English
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