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| | Abstract | | Multilateral approach beyond the conventional CMP stack was applied to the multi-scale, multi-mode seismic data for extraction of deep crustal reflectors through the reconstruction of velocity heterogeneity. In order to build high-resolution velocity structure, we developed a processing workflow based on the hybrid approach of reflection velocity analysis and turning-ray tomography followed by full-waveform inversion. The uncertainty of the tomography solutions was estimated using a nonlinear Monte Carlo approach with randomized initial models, and the velocity structure of sedimentary basin was constrained by the short-wavelength structural heterogeneity estimated by the combination of CRS(Common reflection Surfaces)-driven velocity attribute and full-waveform inversion. We evaluated the relation between reconstructed velocity heterogeneity and the resolution of deep reflection patterns using typical multi-scale deep reflection data acquired in the northeast Japan. |
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