Surface observation microseism speed model correcting method based on amplitude stack
A technology of velocity model and correction method, applied in seismology, geophysical measurement, seismic signal processing, etc., can solve the problems of inaccuracy of velocity model correction, affecting perforation positioning accuracy, indistinguishable maximum value and maximum value, etc. Achieve the effect of correcting the speed model, good positioning effect, and suppressing noise interference
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[0094] The present invention will be clearly and completely described below in conjunction with the accompanying drawings and simulated formation models. The specific implementation steps are as follows:
[0095] a. If figure 2 As shown, the formation model and the schematic diagram of the perforation forward modeling process, the ground acquisition stations are arranged in a star shape, with 6 survey lines in total, 16 geophones for each survey line, and a total of 96 channels. The observed value of first arrival time difference in the model calculation is obtained by forward modeling ray tracing calculation of the true value of the formation model, using 10 Hz Lake wavelet to describe the waveform, and the maximum amplitude of each wavelet is 1. Define the three-dimensional coordinates of the perforation point as X s =236m,Y s =-158m, Z s =-947m, and define a sufficiently large three-dimensional target area with the perforation point as the center.
[0096] b. Divide t...
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