A method for extracting angle-domain common-image gathers based on local plane wave decomposition
Li Haiqiang1,2, Yang Guoquan1,2, Li Zhenchun1,2, Zhang Kai1,2, RanYang3
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Laboratory for Marine Mineral Resources, National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China; 3. Logging & Testing Services, Daqing Oilfield Company, PetroChina, Daqing, Heilongjiang 163000, China
Abstract:With the development of high precision seismic exploration and GPU technology,the prestack reverse-time migration (RTM) becomes a routine nowadays.The reverse-time migration shows great superiority in dealing with complex velocity models without limits of tilt angle.As an important output of reverse-time migration,the angle-domain common-image gather (ADCIG) can provide velocity information and amplitude information for velocity analysis and analysis of amplitude variation with angle of incidence (AVA).In this paper,we propose a method for extracting angle-domain common-image gathers from reverse-time migration.First the source wavefield and receiver wavefield are decomposed into local angle-domain components,and then angle-domain cross-correlation imaging conditions are used to angle-domain common-image gathers.The proposed method has good adaptability to complex structures.Finally,model and field data tests prove the effectiveness and feasibility of the proposed method.
李海强, 杨国权, 李振春, 张凯, 冉扬. 基于局部平面波分解的逆时偏移角道集提取方法[J]. 石油地球物理勘探, 2017, 52(6): 1177-1183.
Li Haiqiang, Yang Guoquan, Li Zhenchun, Zhang Kai, RanYang. A method for extracting angle-domain common-image gathers based on local plane wave decomposition. Oil Geophysical Prospecting, 2017, 52(6): 1177-1183.
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