CCP gather fast extraction based on non-hyperbolic time correction
Yang Zhen1,2, Lu Jun3, Wang Chengxiang4, Wang Yun3
1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Multi-wave and Multi-component Group, State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences(Beijing), Beijing 100083, China; 4. Research and Development Center, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China
Abstract：One of the key points of CCP stack imaging is CCP gather extraction and its velocity analysis.With the binning method,we propose in this paper a converted-wave CCP gather fast extraction based on the accurate time-offset curve equation of converted-wave.In order to solve the asymmetry problem of CCP gathers,we correct non-hyperbolic CCP gathers with virtual sources and virtual receivers.After the correction,we obtain CCP ga-thers which show characteristics of hyperbolic time-offset curves.Thus,the velocity analysis,dynamic correction,and converted-wave stacking can be done with conventional longitudinal-wave processing system.In order to verify the accuracy of the proposed method,we test respectively the CCP gather exaction and the non-hyperbolic correction on both the model and real data.The results show that the energy of the corrected CCP gathers is more concentrated in the velocity analysis and the corrected CCP gathers are more horizontal after the normal moveout correction,which proves the correctness and the precision of the proposed method.
杨震, 芦俊, 王成祥, 王赟. 利用非双曲时距校正快速抽取CCP道集[J]. 石油地球物理勘探, 2018, 53(4): 659-665.
Yang Zhen, Lu Jun, Wang Chengxiang, Wang Yun. CCP gather fast extraction based on non-hyperbolic time correction. Oil Geophysical Prospecting, 2018, 53(4): 659-665.
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