| Autor: |
Jianfeng Zhang, Linong Liu |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Chinese Journal of Geophysics. 54:844-855 |
| ISSN: |
0898-9591 |
| DOI: |
10.1002/cjg2.1667 |
| Popis: |
Based on the 3-D dispersion equation for the transversely isotropic media with a vertical symmetry axis (VTI), we proposed one-way operators in the wavenumber-space domain such that the terms that contain spatial coordinates and the terms that contain wavenumbers are separated. The coefficients in one-way operators are determined using an optimization scheme for more accurately matching to the exact phase-shift operator with a wide-angle. The resulting 3-D VTI wave equation prestack migration algorithm can accommodate a wide range of anisotropy rather than the weak anisotropy. For its practical aspects, we also present a frequency-dependent varying-step depth extrapolation scheme for reducing the computational cost of wavefield depth extrapolation and an anti-alias one-way propagator aiming at imaging the steep dipping structures with 3-D sparsely sampling dataset in 3-D VTI media. The proposed 3-D VTI wave equation prestack migration scheme is demonstrated by SEG 2-D Hess VTI dataset and a 3-D migration impulse response with its layout resulting from the 3-D field data. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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