THE PRESTACK TIME MIGRATION TECHNOLOGY AND ITS APPLICATION
CUI Ru-guo1, Qin Tian1, Ling Xun2, Jia Ming-cheng2, DUAN Yun-qing1
1. Geo-detection Laboratary, Ministry of Education, China University of Geosciences, Beijing 100083, China;
2. Research Institute of Exploration and Development, Xinjiang Branch Company of Petro China, Karamay 834000, China
The zero-offset (z0) section is an important achievement in seismic reflection imaging. The differences between the common midpoint (CMP) and the common reflection point (CRP) are discussed on the basis of the dome-like reflector model. In usual seismic data processing, we cannot get the correct z0 sections if oblique layers are imaged. However, the prestack time migration technique using CRP stacking can help us to obtain the correct z0 sections. This paper discusses the key steps in the application of such prestack time migration techniques as seismic data preprocessing, construction of migration-velocity field and CRP gather processing after migration. The processing effects are demonstrated with real data.
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