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A reflection full waveform inversion method based on common imaging point gathers

A common imaging point gather and full waveform inversion technology, applied in seismology, instruments, measuring devices, etc., can solve problems such as difficult to ensure the accuracy of dynamic characteristics, achieve accurate two-way illumination compensation, and reduce calculation time , calculate the effect of stability

Active Publication Date: 2022-07-19
TONGJI UNIV
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Problems solved by technology

This method does not require interactive picking, and the calculation amount is the same as that of FWI, but it requires prior information of high wave number of the model, and it is difficult to ensure the accuracy of dynamic characteristics by using demigration to synthesize reflection data

Method used

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  • A reflection full waveform inversion method based on common imaging point gathers
  • A reflection full waveform inversion method based on common imaging point gathers
  • A reflection full waveform inversion method based on common imaging point gathers

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Embodiment 1

[0069] In this embodiment, the two-dimensional inclusion model is used as the real model (such as Figure 4 shown), the model has a total of 401 × 201 grids, the grid spacing is 10 m × 10 m, and the minimum and maximum speed are 2000 m / s and 2500 m / s respectively. A total of 201 shots were performed, the shot points were evenly distributed at a depth of 10 meters underground, the distance between the shots was 20 meters, the first shot was at 0 meters in the horizontal position, and the detection points were evenly distributed on the surface at intervals of 10 meters, and the maximum offset distance of each shot was The initial model is a uniform background model of 2000 m / s. During the inversion process, the frequency domain data of 2-22 Hz is divided into 100 frequencies at intervals of 0.2 Hz, and the inversion results like Figure 5 shown. Referring to the real model, it can be found that the reflection full waveform inversion method based on the common imaging point gat...

Embodiment 2

[0082] In this embodiment, the two-dimensional Overthrust theoretical model is used as the real model (such as Image 6 shown), the model has a total of 801 × 187 grids, the grid spacing is 25 m × 25 m, and the minimum and maximum speed are 2300 m / s and 6500 m / s respectively. A total of 401 shots were played, the shot points were evenly distributed at a depth of 25 meters underground, the distance between the shots was 50 meters, the first shot was at 0 meters in the horizontal position, and the detection points were evenly distributed on the surface at 25 meters intervals. The maximum offset is limited to 4000 meters, the minimum offset is 0 meters, and the initial model is the real model Gaussian smoothing result (such as Figure 7 In the inversion process, the frequency domain data of 2-22 Hz is divided into 100 frequencies at intervals of 0.2 Hz, and the inversion results are as follows Figure 8 As shown, it can be seen that the present invention basically accurately rec...

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Abstract

The invention relates to a reflection full waveform inversion method based on common imaging point gathers and imaging domain migration velocity analysis, comprising the following steps: 1) preprocessing original seismic data; 2) preprocessing the preprocessed seismic data Fourier transform to obtain the frequency domain reflecto shot record d(ω, s, g), where ω is the circular frequency, s is the position of the shot point, and g is the position of the detection point; 3) The tomography method is used to establish the initial velocity model , and set the inversion parameters, including the coordinates and number of imaging points, frequency range and frequency interval; 4) Perform the full-waveform inversion of the acoustic wave equation in the frequency domain to obtain the final velocity profile. Compared with the prior art, the present invention has the advantages of fully automatic without interaction, high inversion accuracy, good convergence effect, and simple implementation.

Description

technical field [0001] The invention relates to the field of exploration seismology velocity modeling, in particular to a reflection full waveform inversion method based on common imaging point gathers. Background technique [0002] Seismic migration imaging is to obtain the structural characteristics of the earth's interior by relocating the seismic data observed on the surface to the location where it was generated. The exploration seismic observation system using the active source realizes multiple coverage of the subsurface imaging points through rolling acquisition, which has considerable redundancy, and then in the imaging process, the common imaging point gathers of the same imaging location can be extracted from the data of different offset pairs. (CIG). [0003] As early as the 1980s, Al-Yahya (1989) proposed that "regardless of the subsurface structure, if the macroscopic velocity field is correct, the event axis of the common imaging point gathers obtained after ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30G01V1/28
CPCG01V1/303G01V1/282G01V2210/6222
Inventor 刘玉柱明怡斌李华伍正杨涛
Owner TONGJI UNIV
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