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A full waveform inversion method and system based on non-monotonic search technology

A full-waveform inversion, non-monotonic technology, applied in the field of full-waveform inversion methods and systems, can solve problems such as unfavorable inversion global convergence, reducing inversion calculation efficiency and accuracy, and destroying the global convergence properties of inversion optimization methods. , to achieve good inversion results and ensure the effect of global convergence

Inactive Publication Date: 2021-08-10
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Although this type of method can also make the inversion converge, forcing the objective function to decrease successively will destroy the global convergence property of the inversion optimization method, and when the inversion falls into the vicinity of the local minimum, small step size and zigzag phenomenon will appear , reducing the computational efficiency and accuracy of the inversion, and the gradual decrease of the objective function is not conducive to protecting the global convergence of the inversion

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  • A full waveform inversion method and system based on non-monotonic search technology
  • A full waveform inversion method and system based on non-monotonic search technology
  • A full waveform inversion method and system based on non-monotonic search technology

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Embodiment approach

[0106] As an implementation, the speed model determination module 3 of the present invention specifically includes:

[0107] The simulated wave field data determination unit is used to solve the acoustic wave equation according to the initial velocity model by using the finite difference method, and calculate the simulated wave field data of the kth iteration of the jth frequency group.

[0108] An objective function value construction unit, configured to construct an objective function value according to the seismic observation data and the simulated wavefield data.

[0109] The gradient calculation unit is used to calculate the gradient according to the simulated wave field data by using the adjoint state method.

[0110] The search direction construction unit is configured to use the limited memory quasi-Newton method to construct the search direction according to the gradient.

[0111] The step size determination unit is configured to use the non-monotone search technique...

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Abstract

The purpose of the present invention is to provide a full waveform inversion method and system based on non-monotonic search technology. The method includes: firstly divide the multi-scale inversion frequency into N frequency groups according to the set frequency group range; secondly, use non-monotonic search technology In combination with the initial step size, determine the velocity model of the next iteration corresponding to the jth frequency group according to the seismic observation data and the initial velocity model; then judge whether j is greater than N; if j is greater than N, then set the next iteration corresponding to the jth frequency group The velocity model of the second iteration is output as the optimal velocity model; finally, seismic imaging is performed based on the optimal velocity model. The invention combines the non-monotonic search technology with the initial step size to determine the step size. This method can not only obtain high-precision inversion results under the premise of ensuring the inversion calculation efficiency; To a certain extent, the global convergence of the inversion is guaranteed, and better inversion results are obtained.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a full waveform inversion method and system based on non-monotonic search technology. Background technique [0002] Full waveform inversion (FWI) comprehensively utilizes the full wave information in the seismic wave field, and quantitatively corrects the initial model by fitting the actual observed wave field and the predicted wave field, so as to reconstruct the parameter model of the underground medium such as velocity and density. It can provide rich elastic parameter information such as high-precision compressional and shear wave velocity and density for seismic exploration and exploration of the earth's internal structure. [0003] Full waveform inversion is generally a nonlinear data fitting process, which is repeated iteratively until the objective function formed by the observed data and the synthetic seismic data is small enough. First of all, it is necessa...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36G01V1/18G01V1/30
CPCG01V1/181G01V1/303G01V1/36
Inventor 马晓娜梁光河薛国强秦克章李志远冯海新
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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