He Bing-shou1, Zhang Hui-xing1, Wei Xiu-cheng2, Chen Mei-nian1
1. Ministry of Education Key Lab of Submarine Geosciences and Prospecting Techniques,Ocean University of China, Qingdao City, Shandong Province, 266100, China;
2. Research Institute of Petroleum Exploration & Development,Sinopec,Beijing City,100083,China
Abstract：Imaging condition is one of the important factors which affect the performance and effects of wave equation pre-stack reverse-time depth migration. From the point of view in structure imaging, the application effects which the different imaging condition calculation algorithms applied to the two-way acoustic wave equation pre-stack reverse-time depth migration were studied in this paper. The modeling tests show that for any given imaging conditions, the strong interlayer reflection will be generated for two-way acoustic wave equation pre-stack reverse-time depth migration, the interlayer reflection will deteriorate imaging effects for the shallow layers, if applying wave field normalized cross-correlation imaging condition, the influence for the interlayer reflection will be weaker. For the imaging effects of deep structures, the imaging condition which is based on wave field cross-correlation reverse-time migration is better than the imaging condition which are derived from solution of eikonal equation, it is believed that the normalized cross-correlation imaging condition could compensate the energy for the deep strata while it is being used to migrate the seismic wave. Under the same circumstance, better imaging effects can be achieved by applying the normalized cross-correlation imaging condition.
