TONG Siyou , 1 , 2 , CHEN Ming 1 , ZHOU Huawei 3 , LI Linwei 1 , XU Xiugang 1 , WU Zhiqiang 2 , 4
24 August 2019
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 pore-filling 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.
The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).