Full-waveform inversion method based on seismic record integral

A full-waveform inversion and seismic recording technology, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve the problems of inversion falling into local extremum, lack of low-frequency seismic data, inversion failure, etc. , high reliability, simple calculation effect

Inactive Publication Date: 2017-12-22
OCEAN UNIV OF CHINA
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Problems solved by technology

[0004] Aiming at the above defects in the prior art, the present invention proposes a new full waveform inversion method based on seismic record integration, which s

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  • Full-waveform inversion method based on seismic record integral
  • Full-waveform inversion method based on seismic record integral
  • Full-waveform inversion method based on seismic record integral

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Embodiment 1

[0093] In the following, the present invention will be explained and illustrated through theoretical model tests in conjunction with specific implementation methods.

[0094] In order to further illustrate the realization idea and process of this method and prove the effectiveness of the method, the marmousi2 model is used to test and compare with the results of conventional full waveform inversion.

[0095] S1: Use the marmousi2 model as the true velocity model. The true speed model has a width of 3048m and a depth of 9216m. A square grid is used for discretization, and the grid size is 24m.

[0096] S2: Observation system: 48 shot points and 383 receiver points are evenly distributed on the surface. The sampling time of seismic records is 4.4s, and the sampling interval is 2ms.

[0097] S3: by the real speed model (see figure 2 ) and the Reich wavelet with a source function of 10 Hz, through the regular grid acoustic wave equation of the 2nd order in time and 12th order...

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Abstract

The invention, which belongs to the technical field of underground medium speed model inversion of seismic exploration, relates to a full-waveform inversion method based on a seismic record integral. The method comprises: an observed seismic record is obtained, denoising processing is carried out, and a seismic wavelet is extracted; a simulated seismic record is calculated; time-domain integrating processing is carried out on the observed seismic record after denoising and the simulated seismic record; difference processing is carried out two groups of data after integrating to form a back transmission source, and a back transmission wave field; a forward transmission wave field is calculated; a gradient is calculated; a conjugate gradient is calculated; according to a linear searching method, a step length of iterative updating is calculated; a model correction value is calculated and a speed model is updated; and whether the updated model meets a given condition is determined; if so, a result is outputted; and if not, the updated speed model is used as a new initial speed model and calculation is started again. Therefore, a problem that the inversion is trapped into a local limit value problem because of lack of low frequency seismic data and thus inversion fails during full waveform inversion is solved.

Description

technical field [0001] The invention relates to a full waveform inversion method based on seismic record integration, and belongs to the technical field of inversion of underground medium velocity models. Background technique [0002] Full waveform inversion was first proposed by Tarantola (1984) in the 1980s. However, due to the limitations of computer computing power and field data quality, this method was not widely used until the end of the 20th century. In recent years, full waveform inversion has developed rapidly, and has been gradually applied to marine seismic data, onshore seismic data, crosswell seismic data and time-lapse seismic data. [0003] Although full waveform inversion has made great progress in the application of synthetic data and real data, the method still faces many theoretical and practical challenges (Zhu and Fomel, 2016). Cycle jumping is one of the most important challenges. The main reason for the period jump is that the initial velocity mode...

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Application Information

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IPC IPC(8): G01V1/36
CPCG01V1/364G01V2210/324
Inventor 张建中杨华臣王娟马飞
Owner OCEAN UNIV OF CHINA
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