Method and device for enhancing transverse wave seismic data quality

Abstract

The invention discloses a method and device for enhancing the quality of transverse wave seismic data. The method comprises steps of carrying out the odd polynomial fitting of the converted transversewave seismic amplitude of each converted transverse wave pre-stack seismic trace set through employing elimination fitting, and determining an odd polynomial for the fitting of the converted transverse wave seismic amplitude; determining the converted transverse wave seismic amplitude of the near-geophone offset seismic trace according to the odd polynomial fitting the converted transverse wave seismic amplitude and the incident angle of the reflection point of the near-geophone offset seismic trace; and determining the converted shear wave seismic amplitude after wave mixing according to theconverted shear wave seismic amplitude of the near geophone offset seismic trace, the converted shear wave seismic amplitude and the wave mixing weight parameter. The odd polynomials related to the reflection characteristics of the converted transverse wave seismic signals are adopted for gradual fitting, the obtained fitted converted transverse wave seismic amplitude signal-to-noise ratio is high, the converted transverse wave seismic amplitude of the near geophone offset seismic channel is determined according to the odd polynomials, the near geophone offset seismic signals can be effectively enhanced, and the near geophone offset seismic performance is improved; the near geophone offset seismic data quality is improved.

Description

Technical field[0001]The present invention relates to the technical field of seismic data processing, in particular to a method and device for enhancing the quality of transverse wave seismic data.Background technique[0002]This section is intended to provide background or context for the embodiments of the invention stated in the claims. The description here is not recognized as prior art just because it is included in this section.[0003]Compared with the P-wave pre-stack inversion alone, the P-wave joint inversion adds the shear-wave seismic data. Based on the AVO amplitude characteristics of the P-wave and P-wave prestack, the lithological information obtained is more reliable. Because longitudinal waves are comprehensively affected by pore fluid and rock mass, transverse waves are mainly affected by the interaction of rock structures. The joint inversion of P-wave and P-wave can improve the inversion accuracy of S-wave impedance and density, which is helpful to improve the reliab...

AI Technical Summary

Problems solved by technology

If the quality of the converted shear wave near the offset is not improved, the joint inversion with the converted shear wave directly will seriously affect the reliability of the pre-stack joint inversion

[0005] Although existing denoising methods such as polynomial fitting can improve the signal-to-noise ratio of prestack inversion data to a certain extent, this method ignores the true AVO amplitude characteristics of converted shear waves, disturbing the seismic reflection amplitude with offset or Variations in incident angle feature, reducing amplitude fidelity

[0006] Therefore, there is a problem of low quality in the near-offset range in existing converted shear wave seismic data

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