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Chen A.-P.,Sichuan Petroleum Geophysical Prospecting Company | Zou W.,Sichuan Petroleum Geophysical Prospecting Company | He G.-M.,Sichuan Petroleum Geophysical Prospecting Company | Li Y.-L.,Sichuan Petroleum Geophysical Prospecting Company | And 2 more authors.
Wutan Huatan Jisuan Jishu | Year: 2014

The initial velocity model is primary given in first-arrival seismic tomography, the quality of tomography inversion, convergence and convergence speed are effected mostly by the initial velocity model. An automatically building initial velocity model using first-arrivals has been proposed with near-surface velocity fields tomographic inversion in the paper. Assuming that the first-arrivals are consist of the direct waves and refraction waves, then the initial velocity model is directly calculated by refraction method, which can be realized automatically by program without factitious interfere. The method is applied to the theory model and actual data, then the iterative tomography technique is applied to obtain actual velocity model based on the initial velocity model. The results show that the method is effective with quickly convergence, and the inversion results are consist with real velocity model.

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