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Rapid quasi-newton method-based full-waveform inversion method

A technology of full waveform inversion and quasi-Newton method, applied in the field of full waveform inversion based on fast quasi-Newton method, can solve problems such as the limitations of full waveform inversion technology, and achieve the effect of improving the convergence speed and reducing the amount of calculation.

Inactive Publication Date: 2019-07-26
SICHUAN INST OF GEOLOGICAL ENG INVESTIGATION
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Problems solved by technology

Although the quasi-Newton method avoids the direct calculation of the Hessian matrix and effectively reduces the time and memory consumption, due to the limitation of computing resources, the full waveform inversion technology is always limited to the application in the two-dimensional case

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[0028] In order to make the purpose, steps and features of the present invention clearer, the embodiments and applications of the present invention will be described in detail below in conjunction with the accompanying drawings. The descriptive information provided in the specific embodiments and applications is only an example for explaining the present invention, and should not be used as a limitation of the present invention. Various extensions and combinations of the embodiments described herein will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the invention.

[0029] figure 1 It is a flow chart of frequency domain multi-scale acoustic wave full waveform inversion according to the present invention. Such as figure 1 As shown, a full waveform inversion method based on the fast quasi-Newton method in the embodiment of the present inventi...

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Abstract

The invention discloses a rapid quasi-newton method-based full-waveform inversion method, belongs to the technical field of seismic exploration speed modeling, and aims at improving the convergence rate of a quasi-newton method so as to improve the calculation efficiency of seismic full-wave inversion and reduce the calculated amount. The method comprises the steps of defining a group of weightingcoefficient sequences to construct a parameter model iterative formula; importing a middle iterative parameter model and calculating a quasi-newton iterative direction and an optimum step length on the basis of the parameter model; and updating an original parameter model and the middle iterative parameter model by utilizing weighting coefficients, the iterative direction and the optimum step length. According to the method, calculation is carried out to obtain parameter models closest to optimum solutions, and the parameter models are used for the calculation of the next iteration directionand optimum step length, so that the convergence rates of target functions are improved. In the iterative calculation of each time, more calculated amount is not added in the method, and only a smallamount of multiplication and addition with relatively low complexity are carried out, so that the calculated amount of the full-waveform inversion is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration velocity modeling, and relates to a full waveform inversion method based on a fast quasi-Newton method. Background technique [0002] Theoretically, the full waveform inversion technology has the ability to reveal the geological structure and reservoir parameters under complex geological conditions, and the full waveform inversion in the frequency domain can realize high-precision parameter modeling by using only a few discrete frequency data. For the solution of the full waveform inversion problem, the nonlinear local optimization algorithm is mainly used, namely the gradient method and the Newton method. Even though the gradient method is simple in structure and easy to implement, it only uses gradient information in the calculation process and has first-order convergence. The Newton-like method considers the gradient information of the objective function and the Hessian matrix at t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/28
CPCG01V1/282G01V1/303G01V2210/6222G01V2210/66
Inventor 刘伟安世泽夏波陈全邓在刚周佩华朱春名张小红李彬冯连军李文滔
Owner SICHUAN INST OF GEOLOGICAL ENG INVESTIGATION
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