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Time Domain Full Waveform Inversion Method Based on Amplitude Incremental Coding

A technology of full waveform inversion and incremental coding, applied in the field of time domain full waveform inversion based on amplitude incremental coding, which can solve problems such as poor calculation stability, reduce dependence, increase calculation time, and alleviate cycle skipping. Effect

Inactive Publication Date: 2021-06-22
JILIN UNIV
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Problems solved by technology

However, the above method has the problems of relying on the assistance of other technical means and poor calculation stability, and has some shortcomings in calculation efficiency or inversion results

Method used

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  • Time Domain Full Waveform Inversion Method Based on Amplitude Incremental Coding
  • Time Domain Full Waveform Inversion Method Based on Amplitude Incremental Coding
  • Time Domain Full Waveform Inversion Method Based on Amplitude Incremental Coding

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Experimental program
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Embodiment 1

[0092] According to the exploration requirements, Parallel Computing Toolbox and MATLAB Distributed Computing Server (R2016b) were installed under the Windows 10 Professional Edition system to build the MATLAB parallel platform.

[0093] Full waveform inversion test with missing low frequency information using Marmousi. real model ( Figure 4 ) and a linearly increasing initial model ( Figure 5 ).

[0094] Table 1. Full waveform inversion test parameters with missing low frequency information

[0095] grid size grid distance Line length vertical depth Bandwidth 69×192 12.5m 2400m 862.5m full band

[0096] The grid size of the model is 69×192, the grid spacing is 12.5, the lateral distance is 2400m, and the vertical depth is 862.5m. The seismic wave velocity ranges from 1500m / s to 4000m / s in the model. The grid point is a geophone, and the interval between the geophones is 12.5m, and a total of 12 seismic sources are excited. The seismic sou...

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Abstract

The present invention proposes a time-domain full-waveform inversion method based on amplitude incremental coding. By performing amplitude incremental coding on each sampling point of the simulated data and observation data and adding the amplitude polarity as a constraint, the same Data with different amplitude increments at time points; after encoding, construct a zero-setting matrix, multiply the matrix by the simulated data to set the data that causes cycle jumps to zero, thereby reducing the influence of this part of the data on the gradient; a part of the data After zeroing, the amplitude information of the original data is destroyed; in order to reduce the dependence of the inversion on the amplitude information and highlight the role of the phase information, a global cross-correlation objective function is used. The difference between this method and the traditional method lies in the encoding calculation and zeroing calculation of the simulated data and observation data, while the encoding calculation is simply matrix addition, subtraction, multiplication and division, which will not significantly increase the calculation time of the full waveform inversion. Comparing with the traditional full waveform inversion, the calculation efficiency is not reduced.

Description

technical field [0001] The invention relates to a seismic exploration imaging method, in particular to a time domain full waveform inversion method based on amplitude incremental coding. Background technique [0002] With the increasing demand for oil and mineral resources in the country's economic construction, the focus of mining and oil exploration has gradually shifted to the deep, and efforts have been made to find out the mineral resources in the second depth space, which poses a challenge to the accuracy of seismic inversion imaging. higher requirement. Aiming at this problem, constructing the seismic wave velocity field of the target area with active source full waveform inversion method is a good solution at present. The full waveform inversion method makes full use of the kinematics and dynamics information of seismic waves in the process of recovering the subsurface velocity field. It has the advantages of high imaging precision for complex structures, and can we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/303G01V2210/6222
Inventor 董士琦韩立国张盼陈瑞鼎尹语晨
Owner JILIN UNIV
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