A Joint Velocity Analysis Method Based on Multi-component Data Based on P-S Wave Matching

Abstract

The invention provides a multi-component data joint velocity analysis method based on longitudinal and shear wave matching, which belongs to the field of geophysical exploration data processing. The method utilizes the unified reflected wave time-distance equation of the longitudinal and transverse wave fields to simultaneously perform multi-parameter velocity analysis in the longitudinal and converted wave fields, and utilizes the synchronous comparison of the longitudinal and converted wave gathers to realize the synchronous comparison of the velocity trends between the longitudinal and transverse waves; Using the marker horizon, the relatively accurate vertical velocity ratio of the longitudinal and transverse waves is estimated synchronously, and through section compression, using the principle of consistent depth, the cycle velocity iteration is used to obtain the accurate longitudinal and transverse wave velocity field. By using the invention, the converted wave seismic data can be accurately processed, and a seismic section with high resolution, high fidelity, high signal-to-noise ratio and can clearly reflect the change characteristics of structure and lithology is obtained.

Description

technical field [0001] The invention belongs to the field of geophysical exploration data processing, and in particular relates to a multi-component data joint velocity analysis method based on longitudinal and shear wave matching. Background technique [0002] With the rapid development of multi-component exploration technology, multi-wave (that is, the data containing P-wave and converted wave, usually Z represents P-wave, X, Y represents converted wave), multi-component seismic exploration technology has been widely used in gas cloud imaging, hydrocarbon detection, fluid Lithology prediction and fracture detection methods have been applied, and have gradually played an irreplaceable role in structural imaging, lithology parameter extraction, and oil and gas reservoir identification. [0003] Due to the asymmetry of the converted wave ray path, the converted wave processing flow is different from that of conventional longitudinal wave data. Conventional converted wave vel...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a multi-component data joint velocity analysis method based on P-S wave matching, which solves the problem of the asymmetry of the converted wave propagation path and the increase of the offset length of the three-component acquisition arrangement. and other factors make the velocity analysis of converted wave data more difficult and the accuracy of imaging decrease.

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