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《Chinese Journal of Geophysics》 2007-05
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Rapid method for acoustic wave-equation WTW inversion of crosshole seismic data

DING Ji-Cai~(1,2),CHANG Xu~1,LIU Yi-Ke~1,ZHAO Wei~21 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China2 Technology Research Dept,CNOOC Research Center,Beijing 100027,China  
WTW inversion is a hybrid inversion method of wave-equation traveltime inversion(WT) and waveform inversion.Wave function is used to calculate the traveltime and its derivative(perturbation of traveltime with respect to velocity) in WT inversion.Unlike traditional ray-based travetime inversion,WT has many advantages.No ray tracing or traveltime picking and no high frequency assumption are necessary,and a good result can be reached while starting model is far from real model.Comparing with waveform inversion,WT has low resolution.Complementary to WT,waveform inversion has high resolution,but easily sticks in local minima when the starting model is far from real model.So WTW is a good hybrid inversion method.Traditional WTW is to first reconstruct the smooth characters of model with WT inversion being primary and then reconstruct the detailed characters of model with waveform inversion being primary.But the computation time and memory space used for this method are twice that of WT inversion or waveform inversion.So a simplified method is used actually.That is to first use WT singly and then waveform inversion singly.The disadvantage of the simplified method is that there is no link between the WT and the waveform inversions,and the benefit of each method cannot be utilized to compliment the other method during iterations.This paper proposes a new method to implement WTW inversion with a computation time and memory space comparable to those of WT or waveform inversion.The model calculation of the new method shows a better convergence.
【Fund】: 国家自然科学基金项目(40474020 40474021)资助
【CateGory Index】: P631.44
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