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Multi-domain Frequency Division Parallel Multi-scale Full Waveform Inversion Method

A full-waveform inversion and multi-scale technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problem of wasting a lot of time, and achieve the effects of alleviating cycle skipping, improving computing efficiency, and saving time

Inactive Publication Date: 2017-03-08
JILIN UNIV
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Problems solved by technology

When it is found that the current frequency information is unreliable, then change to a slightly higher frequency to perform Laplace-Fourier domain full waveform inversion, so that in the process of trying to calculate different frequencies, it may waste a lot of time to find the most reliable frequency information time

Method used

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  • Multi-domain Frequency Division Parallel Multi-scale Full Waveform Inversion Method

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Embodiment 1

[0123] According to the exploration requirements, the line toolbox and the computing software distributed computing engine (R2013a) were installed under the Windows 7 flagship system, and the parallel platform of the computing software was built.

[0124] The velocity model is used for testing. Due to the large size of the original velocity model and the limited hardware equipment, the original model is thinned, and the thinned velocity model is used for full waveform inversion testing. real model (with figure 2 ) and the time-domain empirical mode decomposition full-waveform inversion results ( image 3 (right)).

[0125] The model parameters are as follows:

[0126] Table 1 Multi-domain frequency division parallel multi-scale full waveform inversion test parameters

[0127] model size grid spacing Lateral distance vertical depth speed range start frequency frequency band 128*384 50m 19.2km 6.4km 1.5-4km / s 5Hz 5-12Hz

[0128] The ...

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Abstract

The invention relates to a multi-domain frequency-division parallel multi-scale full-waveform inversion method. A smooth initial model is established by using time-domain empirical mode decomposition full-waveform inversion; a high-precision initial model is established by using frequency-division parallel Laplace-Fourier-domain full-waveform inversion; and then an underground high-precision speed model is established again by using frequency-division parallel frequency-domain multi-scale full-waveform inversion. During the whole process, a dynamic random coding strategy is employed, so that the inversion rate is accelerated and the crosstalk noises inside a super gun can be suppressed. According to the invention, multi-domain combined inversion, frequency-division parallel and dynamic random focus coding strategies are used during the underground speed inversion process. Under the circumstances of low frequency deficiency and poor initial models, the smooth initial model is established by using time-domain empirical mode decomposition full-waveform inversion, so that the full-waveform inversion cycle skipping phenomenon is avoided. And during the inversion process, the master-slave parallel calculation method is used, so that the calculation efficiency of full-waveform inversion is improved substantially and the inversion precision is enhanced.

Description

technical field [0001] The invention relates to an underground imaging for seismic exploration, in particular to a frequency division parallel and multi-domain multi-scale inversion method, and uses a dynamic random source coding strategy to perform full waveform inversion. Background technique: [0002] With the development of petroleum industry and the deepening of exploration and development, the exploration difficulty gradually increases from the stage of structural exploration to the stage of lithologic exploration. To meet this requirement, full waveform inversion has developed rapidly and has become a research hotspot in today's geophysical field. In the 1980s, Tarantola proposed the time-domain full-waveform inversion method, and the derivation of the objective function to the model parameters was obtained by the cross-correlation operation of the residual back-propagation wave field and the normal wave field, thus avoiding the need to obtain the model parameters. J...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
CPCG01V1/362G01V2210/30
Inventor 胡勇韩立国张盼张凤蛟蔡中正
Owner JILIN UNIV
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