Anisotropic Wave Field Decoupling via Elastic Parameter Transformation
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Solution Overview
Problem
Current methods for wave field separation in anisotropic media require numerous Fourier transforms, leading to high calculation costs and inefficiencies in decomposing P-wave and S-wave fields.
Innovation Solution
A method that transforms Thomsen parameters into initial elastic parameters, followed by S-wave and P-wave velocity separation processing, allowing for the substitution of target elastic parameters into an anisotropic model to avoid inverse Fourier transforms and simplify the decomposition process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wave field separation method with wavenumber domain is used in anisotropic medium, then the wave field can be separated by calculating polarization direction and projecting wave field, but the calculation cost becomes huge due to requiring a large number of Fourier transforms
Solution Approach 1:
The patent changes the parameter representation from Thomsen parameters to equivalent elastic parameters (EEPs), which allows the wave field separation to be performed using modified isotropic decomposition techniques. This parameter transformation enables the use of simpler decomposition methods that avoid extensive Fourier transforms while maintaining separation accuracy in anisotropic media
Solution Approach 2:
The patent replaces the traditional wavenumber domain Fourier transform-based separation method with a time-domain elastic parameter decomposition method. By substituting the mechanical computation approach (Fourier transforms) with an equivalent parameter-based method, the calculation efficiency is significantly improved while avoiding the harmful computational burden
2Ease of manufacture
If isotropic wave field separation methods are used, then the decomposition process is simple, but these methods are not applicable to anisotropic medium where polarization direction is not parallel or perpendicular to propagation direction
Solution Approach 1:
The patent transforms the anisotropic medium problem into an equivalent isotropic problem by changing the elastic parameters to EEPs. This parameter substitution allows simple isotropic decomposition methods to be applied to anisotropic media, achieving both simplicity and adaptability simultaneously
Solution Approach 2:
The patent introduces equivalent elastic parameters (EEPs) as an intermediary between the anisotropic Thomsen parameters and the isotropic decomposition methods. This intermediary transformation enables the bridge between simple isotropic methods and complex anisotropic applications, allowing the use of simple decomposition algorithms while handling anisotropic wave propagation correctly
Data Source
AI summary
This disclosure relates to the technical field of exploration geophysics, in particular to a method, a device, and a computer device for decoupling anisotropic elastic wave. The method includes: determining a set of Thomsen parameters included in an anisotropic model based on a received to-be-decomposed wave field decomposition request; transforming the set of Thomsen parameters to obtain a set of initial elastic parameters; performing S-wave and P-wave velocities separation processing for the set of initial elastic parameters to obtain a set of target P-wave elastic parameters and a set of target S-wave elastic parameters; and substituting those into the anisotropic model to process the to-be-decomposed wave field and obtain a target P-wave matrix and a target S-wave matrix. The process of decomposing S-wave and P-wave fields is simplified and the calculation cost is reduced according to the embodiments of this disclosure.