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Band-limited Green's Function Filtered Multiscale Full Waveform Inversion Method

A technology of full waveform inversion and Green's function, which is applied in measurement devices, instruments, scientific instruments, etc., can solve problems such as cycle skipping, and achieve the effects of reducing nonlinearity, saving time, and alleviating the phenomenon of cycle skipping.

Inactive Publication Date: 2018-06-08
JILIN UNIV
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Problems solved by technology

However, the actually collected seismic data often do not contain low-frequency information below 5 Hz. Even if the high-frequency components in the seismic data are filtered out by low-pass filtering to obtain a relatively flat seismic waveform, when the initial model is poor, the Scaling strategy still suffers from cycle skipping problem

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  • Band-limited Green's Function Filtered Multiscale Full Waveform Inversion Method
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  • Band-limited Green's Function Filtered Multiscale Full Waveform Inversion Method

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Embodiment 1

[0123] The test model parameters are as follows:

[0124] Based on the two-dimensional time-domain constant-density acoustic wave equation, the invented band-limited Green's function filter multi-scale full waveform inversion method is tested. The Marmousi model is thinned out. The horizontal and vertical size of the test model grid is 69×192, the model grid spacing is 12.5m, the horizontal distance is 2.4km, and the vertical distance is 0.8625km. The focal depth is 50m, a total of 20 shots are evenly distributed on the surface. The depth of the geophones is 12.5m, and there are 192 geophones in total, that is, one geophone for each grid. The source of the seismic source is the Reker wavelet with a main frequency of 22Hz, the sampling interval is 0.001s, and the total time sampling length is 2.5s. In this paper, the horizontal linear model is used as the initial velocity model of FWI, and the velocity ranges from 1.5km / s to 4km / s

[0125] The parameters of parallel full wav...

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Abstract

The invention relates to a band-limit Green function filtering multi-scale full-waveform inversion method, and the method comprises the steps: carrying out the filtering of seismic data through the Green function of an initial speed model; processing solved gradient through a precondition gradient method, and enabling the method provided by the invention to be able to obtain the macroscopic information of the model at the initial stage of inversion; adjusting a precondition gradient coefficient when the speed model gradually approaches a real speed model, and enabling the method provided by the invention to be able to gradually depict the detail information of the speed model; finally combining with a minute gun parallel inversion strategy, making the most of advantages of computer multi-thread parallelism, and speeding up the full-waveform inversion. From the point of a testing result of the method, the method can effectively alleviate the cycle wave jump of full-waveform inversion under the condition that an initial model is not good when the low-frequency part of seismic data is lost.

Description

technical field [0001] The invention relates to an underground imaging method for seismic exploration, in particular to a band-limited Green's function filter full-waveform inversion method for realizing multi-scale full-waveform inversion using a gradient preconditioning method. Background technique: [0002] The full waveform inversion method is a process of continuously using simulated data to fit the actual data, and finally finds a velocity model that minimizes the square of the residual error of the data. It has the advantages of high imaging precision, accurate inversion model parameters, and good imaging effect of complex structures. In order to meet the requirements of high-precision imaging in seismic exploration, full waveform inversion has developed rapidly and has become a research hotspot in the field of geophysics today. In the 1980s, Tarantola (1984) proposed the time-domain FWI method, and obtained the gradient of the objective function through the adjoint ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
CPCG01V1/282G01V1/345G01V2210/74
Inventor 胡勇韩立国葛奇鑫陈瑞鼎董士琦
Owner JILIN UNIV
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