Reverse-Time Migration of Converted S-Waves of Varying Densities  

作　　者：TONG Siyou CHEN Ming ZHOU Huawei LI Linwei XU Xiugang WU Zhiqiang 

机构地区：[1]Key Laboratory of Submarine Geosciences and Prospecting Techniques,MOE,Ocean University of China,Qingdao 266100,China [2]Function Laboratory of Marine Geo-Resource Evaluation and Exploration Technology,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266200,China [3]Department of Earth and Atmospheric Sciences,University of Houston,Houston TX77004,USA [4]Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266100,China

出　　处：《Journal of Ocean University of China》2019年第5期1093-1097,共5页中国海洋大学学报（英文版）

基　　金：supported by the National Science and Technology Major Project (No. 2016ZX05027-002);the National Natural Science Foundation of China (No. 41230 318);Qingdao National Laboratory for Marine Science and Technology Innovation Project of Ao-Shan (No. 2015ASKJ03)

摘　　要：Ocean-Bottom Node(OBN)acquisitions provide both non-converted and converted reflection energy.There is a clear advantage to independently imaging both P-and S-waves,as they provide more information collectively than either does alone.In many conventional converted-wave pre-stack migration algorithms,density is treated as a constant,which is not the real-life case on earth.S-wave velocity and density information is crucial for hydrocarbon detection because it helps in the identification of porefilling fluids.In this paper,we focused on the effect of density on imaging,and developed a method of reverse-time migration(RTM)on converted s-waves of varying densities(VD-RTMCS).Phase correction was required prior to pre-stack migration to avoid constructive interference between data from adjacent sources.Synthetic data examples showed that when density variations were included,image profiles showed advantages in signal-to-noise ratio,vertical resolution and imaging of complex structures.Ocean-Bottom Node(OBN) acquisitions provide both non-converted and converted reflection energy. There is a clear advantage to independently imaging both P-and S-waves, as they provide more information collectively than either does alone. In many conventional converted-wave pre-stack migration algorithms, density is treated as a constant, which is not the real-life case on earth. S-wave velocity and density information is crucial for hydrocarbon detection because it helps in the identification of porefilling fluids. In this paper, we focused on the effect of density on imaging, and developed a method of reverse-time migration(RTM) on converted s-waves of varying densities(VD-RTMCS). Phase correction was required prior to pre-stack migration to avoid constructive interference between data from adjacent sources. Synthetic data examples showed that when density variations were included, image profiles showed advantages in signal-to-noise ratio, vertical resolution and imaging of complex structures.

关 键 词：density MIGRATION OBN converted-wave 

分 类 号：P[天文地球]