A method and device for pre-stack anisotropy inversion of VTI medium

The formula for the longitudinal wave reflection coefficient of VTI medium derived by Bayesian theory and Rüger approximation equation, combined with convolution theory and the maximum a posteriori probability principle, solves the problem that conventional methods cannot be adapted to VTI medium inversion, and realizes direct inversion of formation properties and improves inversion accuracy.

CN117805906BActive Publication Date: 2026-06-09CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2022-09-30
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing conventional pre-stack seismic inversion methods cannot meet the requirements for geophysical inversion and quantitative interpretation of shale reservoirs, especially for VTI media with horizontal bedding characteristics. These methods have many inversion parameters and poor sensitivity, making them difficult to adapt to actual pre-seismic inversion needs.

Method used

The inversion is performed using a pre-defined expression for the P-wave reflection coefficient of VTI medium based on Bayesian theory, which reduces the number of parameters to be inverted. By acquiring pre-stack seismic data, the formula for the P-wave reflection coefficient of VTI medium derived from the Rüger approximation equation and Thomsen parameters is used. Combined with convolution theory and the maximum a posteriori probability principle, an inversion objective function is constructed and iteratively solved to output the inversion results.

Benefits of technology

It achieves the reduction of parameters to be inverted while ensuring accuracy, and directly inverts stratigraphic properties, which is applicable to actual pre-earthquake inversion and improves the accuracy and efficiency of inversion.

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Abstract

The application discloses a pre-stack anisotropy inversion method and device of VTI medium, electronic equipment and storage medium, and the method comprises the steps of obtaining pre-stack seismic data of a target work area; based on the Bayesian theory and the pre-stack seismic data, the to-be-inverted parameters in the preset expression of the VTI medium P-wave reflection coefficient are inverted, and the pre-stack anisotropy inversion of the VTI medium is realized; wherein the preset expression of the VTI medium P-wave reflection coefficient comprises three to-be-inverted parameters related to the P-wave velocity or the S-wave velocity. While ensuring the accuracy of the original formula, the number of to-be-inverted parameters is reduced, and the formation property can be directly inverted, instead of the gradient change between formations, so that the method can be better applied to actual pre-stack inversion of earthquakes.
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