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
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[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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