Time Domain Full Waveform Inversion Method Based on Wavefield Local Correlation Time Shift
A full-waveform inversion, time-domain technology, applied in seismic exploration imaging, time-domain full-waveform inversion, and time-domain full-waveform inversion based on the local correlation time shift of the wave field, can solve problems such as poor computational stability, and achieve The effect of improved matching and fewer cycle skips
Inactive Publication Date: 2019-11-22
JILIN UNIV
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Problems solved by technology
The above methods either rely on the assistance of other technical means or have poor calculation stability, and have some shortcomings in calculation efficiency or inversion results
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Embodiment 1
[0086] According to the exploration requirements, Parallel Computing Toolbox and MATLAB Distributed Computing Server (R2016b) were installed under the Windows 10 Professional Edition system to build the MATLAB parallel platform.
[0087] Full waveform inversion test with missing low frequency information using Marmousi. real model ( Figure 4) and a linearly increasing initial model ( Figure 5 ).
[0088] Table 1. Full waveform inversion test parameters with missing low frequency information
[0089] grid size grid distance Line length vertical depth Fluc Bandwidth 69×192 12.5m 2400m 862.5m 20Hz 11~20Hz
[0090] The grid size of the model is 69×192, the grid spacing is 12.5, the lateral distance is 2400m, and the vertical depth is 862.5m. The seismic wave velocity ranges from 1500m / s to 4000m / s in the model. The grid point is a geophone, and the interval between the geophones is 12.5m, and a total of 12 seismic sources are excited. The ...
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The invention relates to a time-domain full-waveform inversion method based on local correlation time shift of a wave field. On the basis of sliding time window time-shift correction, simulation and observation records are cut off by a time window; time shifting is carried out on the simulation record based on the position with the maximum value of simulation and observation record correlation, sothat the correlation degree is increased; and correlated time shifting is carried out on the waveform in a next time window along the sampling time shaft moving window until all sampling points are covered by time window movement to complete waveform time-shift correction of all simulation records, so that the simulation and observation record matching degree is increased. Because of the displacement of the waveform of the simulation record, phase information of all sampling points is close to the observation record but corresponding amplitude information is not corrected; and the global cross-correlation objective function depending on the amplitude information little is used for carrying out full-waveform inversion so as to reduce the influence on the inversion by the amplitude error. According to the invention, under the circumstance that the computing efficiency is not reduced, occurrence of the cycle skipping problem in full-waveform inversion is reduced and the inversion precision is improved.
Description
technical field [0001] The invention belongs to the technical field of seismic exploration, and relates to a seismic exploration imaging method, in particular to a time-domain full-waveform inversion method, in particular to a time-domain full-waveform inversion method based on local correlation time shift of wave fields. Background technique [0002] The field of petroleum exploration and development has shifted from shallow oil and gas reservoirs to deep oil and gas reservoirs in complex structural geological regions. Due to its shallow exploration depth, outdated construction methods and low exploration precision, the traditional seismic exploration method can no longer meet the needs of today's petroleum energy exploration and development. As a result, many emerging industrial technologies and exploration methods were gradually developed. As a high-precision inversion method of underground medium parameters, full waveform inversion has become a hot topic in the field of...
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IPC IPC(8): G01V1/30G01V1/36
CPCG01V1/303G01V1/36G01V2210/6222
Inventor 董士琦韩立国胡勇张盼尹语晨陈瑞鼎
Owner JILIN UNIV