Full elastic waveform inversion in Laplace-Fourier domain based on time domain weighting
LIU Zhangju1,2,3,4, TONG Siyou1,2, FANG Yunfeng5, JIA Junlian6
1. Key Lab of Submarine Geosciences and Prospecting Techniques, MOE, Ocean University of China, Qingdao, Shandong 266100, China; 2. Functional Laboratory for Marine Mineral Resources Assessment and Prospecting, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266061, China; 3. School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang 310027, Chian; 4. Key laboratory of Submarine Geosciences, Second Institute of Oceanography, Ministry of Natural Resoures, Hangzhou, Zhejiang 310012, China; 5. BGP Recearch & Development Center, CNPC, Zhuozhou, Hebei 072751, China; 6. Geophysical Research Institute, BGP, CNPC, Zhuozhou, Hebei 072751, China
Abstract：Full elastic waveform inversion is a strong nonlinear problem and easy to fall into the local minimum due to strong dependence on the precision of the initial model or the low-frequency component of seismic record, which lead to failed inversion. In this study, we set up full elastic waveform inversion in Laplace-Fourier domain based on time domain weighting. This method reduces the dependence of full waveform inversion on low-frequency components by introducing a Laplace atte-nuation factor into the full waveform inversion in time-Fourier domain, and forms time-Laplace-frequency domain elastic inversion with the advantages of three domains by combining the advantages of time domain and frequency domain. And finally the negative effect of the Laplace attenuation factor is eliminated by the flexible form of weighting seismic records in time domain. Application to model data has proved that, in the absence of low-frequency components, this method can obtain more accurate inversion results with low dependence on the initial model.