Multiples influence on structure imaging in reverse time migration
Ye Yueming1, Guo Qingxin1, Sun Xiaodong2, Zhuang Xijin1, Zhao Changlei1, Qian Jin3
1. Hangzhou Research Institute of Geology, PetroChina, Hangzhou, Zhejiang 310023, China; 2. College of Geo-resources and Information, China University of Petroleum (East China), Qingdao, Shandong 266555, China; 3. Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong 266071, China
Abstract：Reverse time migration can theoretically image seismic multiples. However, these multiples are always suppressed from seismic data before reverse time migration. In order to solve the problem, we first discuss the extrapolation process of multiples in reverse time migration. Then we divide the imaging conditions into three parts: imaging of real structure, low-frequency noise in non-structure area, and artifacts. According three models tests, we conclude that reverse time migration can image interval multiples and surface-related multiples, but we still need to suppress multiples before reverse time migration in real data processing to avoid artifacts caused by multiples.
