Full waveform inversion gradient pretreatment method based on model smoothing algorithm

A technology of full waveform inversion and smoothing algorithm, applied in seismic signal processing, geophysical measurement, measuring devices, etc., can solve problems such as interference gradient preprocessing accuracy, reduce the influence of reflected waves and multiple waves, improve accuracy, The effect of enhancing the effect

Active Publication Date: 2018-04-10
OCEAN UNIV OF CHINA
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Problems solved by technology

Theoretically, it is more accurate to use the energy of the transmitted wave field as a correction factor for geometric diffusion and illumination imbalance. In addition to the transmitted wave energy, it also contains a large number of reflected waves / multiple waves. The energy of reflected waves / multiple waves will interfere with the accuracy of gradient preprocessing

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  • Full waveform inversion gradient pretreatment method based on model smoothing algorithm
  • Full waveform inversion gradient pretreatment method based on model smoothing algorithm
  • Full waveform inversion gradient pretreatment method based on model smoothing algorithm

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Embodiment Construction

[0029] The OverThrust model is used here (see the OverThrust speed model image 3 ) for specific implementation. The OverThrust model is a well-known model for testing the accuracy of seismic data processing and inversion methods. The model is 10,000m long horizontally and 2325m deep vertically.

[0030] Based on the OverThrust model, a total of 521 shot seismic records are simulated and used as the inversion observed seismic records by using the full array observation method. The shot collection records that each shot is received by 521 channels, the shot interval and the track interval are both 25m, and the shot point depth and the receiving point depth are both 25m.

[0031] The initial model for full waveform inversion is as Figure 4 Shown, set forth in detail the concrete implementation process of the present invention below:

[0032] (1) Enter the gradient value g of the last iteration i-1 (x) (i is the current iteration number), speed model M n , seismic wavelet w...

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Abstract

The invention provides a full waveform inversion gradient pretreatment method based on a model smoothing algorithm and belongs to the field of seismic waveform inversion. The method comprises the following steps: in each iterative inversion, to begin with, carrying out smoothing on a velocity model obtained through iteration; then, based on the smoothed velocity model, carrying out simulation through acoustic wave equation finite difference simulation technology to obtain positive time wave field energy of shot point source wavelets and inverse time wave field energy with actual seismic records being disturbance; and finally, carrying out gradient pretreatment by utilizing the positive time wave field energy and the inverse time wave field energy. Model experiment results show that the method can effectively reduce the influence of reflected waves and multiple waves in wave field energy calculation; gradient pretreatment precision is improved; and full waveform inversion effect is improved obviously.

Description

technical field [0001] The invention belongs to the field of seismic waveform inversion, in particular to a gradient preprocessing method for full waveform inversion based on a model smoothing algorithm. Background technique [0002] In the 1980s, Tarantola et al. first proposed a time-domain full waveform inversion method based on the least square theory. This method makes full use of the travel time, amplitude, and phase information of the measured seismic records to reconstruct the velocity structure of the underground medium. The accuracy of an ideal observation system can reach the order of wavelength, so full waveform inversion is considered to be an important method that can further improve the oil and gas exploration capabilities of seismic exploration, and is expected to play an important role in future oil and gas exploration. [0003] The full waveform inversion uses the least square functional of the error between the theoretical seismic record and the actual sei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
CPCG01V1/36G01V2210/66
Inventor 宋鹏解闯夏冬明谭军李金山姜秀萍赵波张超张洪洋张锐埼李嘉音
Owner OCEAN UNIV OF CHINA
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