Approximation of scattering in fine layering by first-order binary scattering
- Univ. of Hamburg (Germany)
Seismic scattering in elastic fine layering can be interpreted in terms of binary scattering which allows a transmitted wavefield to be associated to direct transmission and binary scattering of first and second order. Binary scattering considers transformation by conversion or redirection, respectively, between two wavefields. At very large wavelengths, however, this behavior abruptly changes. Very strong first and second order wavefields predominantly cancel each other with amplitudes exceeding by far the input amplitude. Here a separation of the scattered wavefield obviously violates the physical nature of wave propagation. This can be regarded as another aspect of finely layered media behaving like homogeneous transversely isotropic media without scattering attenuation at very large wavelengths. In synthetic models, the boundary between this region of homogeneous wave propagation and the validity region of scattering field separation is well described by an empirical relation. It defines a limiting ratio of the spatial correlation length of the medium and the wavelength. Comparison to spatial correlation lengths from log data finds seismic wavelengths predominantly in the validity region of scattering field separation.
- OSTI ID:
- 89745
- Report Number(s):
- CONF-941015--
- Country of Publication:
- United States
- Language:
- English
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