Research on Key Technologies for Converted-Wave Seismic Data Processing
DOI:
https://doi.org/10.54097/0mgph644Keywords:
Converted wave, Static correction, OVT domain, VTI media, pre-stack time migrationAbstract
Compared with the processing technology of P-wave seismic data, there are still many challenges in the processing of converted-wave seismic data: The initial arrival of the conversion wave cannot be effectively and accurately picked up, and due to the difficulty in establishing an accurate near-surface model of the transverse wave, the calculation of the static correction amount of the conversion wave is difficult, The conventional conversion wave velocity analysis method relies on the establishment of the longitudinal wave velocity model, which is inefficient, Meanwhile, its accuracy is doubly affected by the longitudinal wave velocity and the transverse wave velocity. The conversion wave velocity has multiple solutions, which affects the imaging effect of seismic data.in the light of of the problems above, This paper proposes the multi-information fusion conversion wave static correction technology, the integrated Offset velocity modeling, and the OVT domain (Offset Vector Tile)VTI(Vertical Transverse Isotropy) prestack time offset technology, Through the processing of actual data: The static correction quantity calculated by variable coefficient static correction has higher accuracy than that calculated by constant coefficient static correction, Regularization processing in the OVT domain can effectively reduce the acquisition footprints of the conversion wave data and restore the missing areas of the data, making the amplitude distribution more uniform, Integrated velocity modeling can achieve the interactive update of the four parameters of the conversion wave, effectively improving the processing efficiency and accuracy of the pre-stack time offset of the conversion wave.
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