Traveltime inversion method of single-frequency waveform in time domain independent of source wavelet

A source wavelet and time domain technology, applied in seismology, seismic signal processing, measuring devices, etc., can solve problems such as error update, mismatch between observation records and simulated records, unknown source function, etc., to achieve simple changes and avoid phases Mismatch issues, effects of mitigating cycle skipping

Inactive Publication Date: 2018-06-26
JILIN UNIV
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Problems solved by technology

[0004] The source wavelet is an important parameter in the process of full waveform inversion. A small error will cause a mismatch between the observation record and the simulation record, and even cause the entire inversion to be updated in the wrong direction.
However, in actual seismic data, the source function is often unknown, which becomes another huge challenge for full waveform inversion

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  • Traveltime inversion method of single-frequency waveform in time domain independent of source wavelet
  • Traveltime inversion method of single-frequency waveform in time domain independent of source wavelet
  • Traveltime inversion method of single-frequency waveform in time domain independent of source wavelet

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Embodiment 1

[0150] According to the exploration requirements, MATLAB2013a was installed under Windows 7 ultimate system, and the seismic data processing software Crews toolkit based on MATLAB language was installed.

[0151] The present invention utilizes Marmousi for testing, and Marmousi has complex structure, fine bedding and deep oil reservoir structure, and is very suitable for theoretical method testing. The original Marmousi model is relatively large. Considering hardware memory and calculation time factors, the present invention thins out the original model, and uses the thinned Marmousi model to test the time-domain single-frequency waveform traveltime inversion method independent of the source wavelet. real model ( Figure 12 left) and the linearly increasing initial model ( Figure 12 right).

[0152] The model parameters are as follows:

[0153] Table 1: Test parameters (time domain) of the time-domain single-frequency waveform traveltime inversion method independent of the s...

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Abstract

The invention relates to a time-domain single frequency waveform travel time inversion method independent of source wavelets. In view of the cycle skip phenomenon in full waveform inversion due to theloss of low-frequency components in seismic data, wave equation travel time inversion is carried out based on time-domain single frequency waveform, and a high-precision initial velocity model is constructed for conventional full waveform inversion, in order to solve the problem of cycle skip and obtain a high-precision full waveform inversion result. The invention aims to reduce the dependence of full waveform inversion on low-frequency components, avoid waveform mismatch caused by inaccurate source wavelets, and provide more technical support for full waveform inversion in practical application. The method greatly alleviates the cycle skip phenomenon in the full waveform inversion process, improves the inversion accuracy, and provides a high-precision initial velocity model for conventional full waveform inversion. The influence brought about by inaccurate source wavelets can be avoided while the problem of cycle skip in full waveform inversion is solved.

Description

technical field [0001] The invention relates to a data processing method for seismic exploration, in particular using travel time difference information of a single-frequency waveform for inversion, and using phase correction technology to eliminate the influence of seismic source wavelet inaccuracy on the inversion process. The entire calculation process adopts the parallel strategy of separate shots, the purpose is to speed up the process of the travel time inversion of the entire wave equation. Background technique: [0002] The full waveform inversion of seismic exploration is to obtain the underground medium information according to the information of the collected seismic wave waveform. Traditional techniques such as migration velocity analysis and traveltime tomography can only obtain macroscopic velocity fields, but cannot obtain high-precision velocity models. With the development of the petroleum industry and the deepening of exploration and development, oil and g...

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G01V1/28
CPCG01V1/282
Inventor胡勇韩立国常傲董士琦陈瑞鼎
OwnerJILIN UNIV