P-wave to S-wave Velocity Ratio Scanning Method Based on the Sinc Interpolation and Correlation Spectrum

doi:10.11885/j.issn.1674-5086.2018.01.11.01

Abstract

Abstract: In the multi-component seismic technique, accurate extraction of the P-wave to S-wave velocity ratio (γ) is an important step in multi-component data processing, inversion, and interpretation. As the wave impedance ratio for the same underground layer is the same, the reflected P-wave and reflected converted wave are interrelated at this layer. The P-wave to S-wave velocity ratio and time ratio can be mutually converted. In the P-wave to S-wave velocity ratio scanning method based on the sinc interpolation algorithm and correlation coefficient spectrum analysis, a series is set, and the sinc interpolation algorithm is used to cross-correlate the stretched P-wave with the converted wave. When the cross-correlation coefficient reaches its maximum value, the corresponding ratio can be obtained. The effectiveness, accuracy, and practicality of this method are verified through testing with both theoretical and actual data.

Key words: multi-component seismic technique, converted wave, P-wave to S-wave velocity ratio, sinc interpolation, crosscorrelation coefficient

CLC Number:

TE132

WANG Jian, WU Bo, XU Tianji. P-wave to S-wave Velocity Ratio Scanning Method Based on the Sinc Interpolation and Correlation Spectrum[J]. 西南石油大学学报(自然科学版), 2019, 41(1): 85-90.

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