Acoustic multiscale full waveform inversion of time domain based on FCG

Abstract

Summary Full waveform inversion(FWI) reconstructs the structure of stratum using the parameters of seismic wave field kinematic and dynamic, like amplitude, travel time and phase, to get high precision and high resolution velocity model. The accuracy of inversion an be order of magnitude as the wavelength. And it is an advanced method to improve the accuracy of seismic velocity modeling and migration. The FWI has many methods, the steepest descent method, the conjugate gradient method, Gauss Newton method, etc…In this paper, a fast conjugate gradient method (FCG) is applied to the full waveform inversion of multi - scale time domain acoustic wave, which is greatly reduce computation time compared with the traditional conjugate gradient method. And last, the paper uses complex Marmousi model to test the method showed the effective of the method.