Wang Zheng1,2, Yang Kai3, Dong Shuili2, Jin Xiang-long1,4,5, Fang Nianqiao1
1. China University of Geosciences (Beijing), Beijing 100083, China;
2. China Oilfield Services Limited, Tianjin 300451, China;
3. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;
4. Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou, Zhejiang 310012, China;
5. Second Institute of Oceangraphy, State Oceanic Administration, Hangzhou, Zhejiang 310012, China
Abstract：The common-reflection-surface stack combined with output imaging scheme (CRS-OIS) is a novel technique to implement CRS stack based on a unified Kirchhoff imaging approach. It is a better option than conventional CRS stack to deal with conflicting dip problems. However, we think the CRS-OIS can do more in this aspect. In this paper, we propose a work-flow to handle dip discrimination phenomenon based on a cascaded implementation of prestack time migration, CRS-OIS and prestack time demigration. Firstly, a common offset prestack time migration is implemented. Then, a CRS-OIS is applied to the time-migrated common offset gather. Afterwards, a prestack time demigration is performed to reconstruct each unmigrated common offset gather, it is confirmed that this method can give a better solution after modeling data and field data processing test.
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