Preconditioned visco-acoustic least-squares reverse time migration integrated with point spread function
YAO Zhen'an1, SUN Chengyu2, YU Zhichao3, MA Zhen2
1. Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology, Nanchang, Jiangxi 330013, China; 2. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 3. Institute of Oil & Gas, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Abstract：In conventional visco-acoustic least-squares reverse time migration (Q-LSRTM),the adjoint Q propagators used for backward propagating residual data are also attenuative.Thus,the inverted images from Q-LSRTM are often observed to have lower resolution.To increase the resolution of Q-LSRTM,a preconditioned visco-acoustic least-square reverse time migration is put forward in this paper.The preconditioner is built with viscoa-coustic deblurring filters based on visco-acoustic point spread function.Model tests show that the preconditioned Q-LSRTM can produce images with higher resolution and more balanced amplitudes with faster convergence rate.With sensitivity tests of migration Q model,as the same case of Q-LSRTM,preconditioned Q-LSRTM also need a fairly accurate estimation of migration Q model in order to obtain noticeable improvements in the image quality,meanwhile a fairly accurate velocity model is also needed.
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