A method utilizing a reflected wave velocity information retrieval low wavenumber component

Information retrieval using the reflection wave velocity low wavenumber component, comprising: 1) establishing an initial velocity model, and depth migration reflection coefficient; 2) using reverse offset obtaining operator information from the reflected wave background velocity field ; 3) calculating a reflected wave travel time difference correction method using the moving picture; 4) calculated along the source path and obtaining a reflected wave, the reflected wave will be accompanied by the source along a path back propagation, to give multi-shot gradient; 5) determines the step size and the update rate field; 6) repeat 1) to 5) steps, the final result obtained by determining the inversion iteration convergence conditions. The present invention can utilize a smooth velocity field obtained anti-offset analog reflected wave, the reflected wave path to construct the background velocity field inversion, provide good initial velocity model of full waveform inversion, the reflected wave travel time difference is obtained Discard manual pick-up process, to avoid falling into local extreme value and improve the stability of the inversion, seismic exploration can achieve automation speed the modeling process.