3D sound wave equation arbitrary-domain multi-scale full-waveform inversion method and 3D sound wave equation arbitrary-domain multi-scale full-waveform inversion device

Abstract

The invention relates to a 3D sound wave equation arbitrary-domain multi-scale full-waveform inversion method and a 3D sound wave equation arbitrary-domain multi-scale full-waveform inversion device. The method comprises the following steps: giving an actual acquired wave field of a target area, and determining the size of a discrete model; determining the calculation accuracy and efficiency according to the size of the discrete model, using the accuracy and efficiency to determine a forward modeling method, and determining the search direction by use of the forward modeling method and wave field transform between different domains; determining the scale of full-waveform inversion; determining an initial velocity model of the target area; for each scale of full-waveform inversion, iterating and updating the velocity of the initial velocity model based on the search direction until iteration stopping conditions are satisfied; and after iteration is stopped, outputting a velocity model, which is the result of full-waveform inversion.

Description

technical field [0001] The invention relates to the technical field of seismic imaging, in particular to a method and device for inverting a three-dimensional acoustic wave equation in an arbitrary domain and multi-scale full waveform. Background technique [0002] Multiscale full waveform inversion of 3D acoustic wave equation is an effective seismic imaging method, which can be performed in time domain, frequency domain and Laplace-Fourier domain. This method starts with a simple initial model and directly uses the received seismic data to directly obtain quantitative information about the parameters of the subsurface medium. The basis of this method is the forward modeling of the three-dimensional acoustic wave equation. Because the gradient calculation and step size selection in inversion are all realized through forward modeling. The accuracy and efficiency of forward modeling directly affect the accuracy and efficiency of multi-scale full waveform inversion of 3D aco...

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Problems solved by technology

[0005] The main purpose of the embodiments of the present invention is to propose a method and device for inversion of three-dimensional acoustic wave equations in arbitrary domains and multi-scale full waveforms, to solve the problem of the low precision of the forward algorithm used in the multi-scale full waveform inversion of three-dimensional acoustic wave equations and the The problem of low efficiency of the optimization method

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