Abstract:Seismic migration imaging is an important component to seismic data processing. The author and his colleagues have devoted to study project migration imaging since 1994,which includes 3-D(2-D) pre-stack (post-stack) depth (time) domain project migration etc. In this paper we mainly describe the principle and implementation method for post-stack 3-D project time migration.The proposed method is on the basis of famous Fourier projection theorem.After processing of 3-D seismic data volume by making horizontal time slice along time axis and Radon projection,we obtained a series of 2-D radial sections. Using Radon interpolation and then reverse projection for these sections,the purpose of 3-D migration finally can be achieved.Compared with one-pass migration method,the project migration showed a result having improvement in ration of signal to noise for all sections,obviously improving the continuity of events and the accuracy of imaging in local area.This paper also discused about the migration aperture in seismic data processing. The application of some methods,such as project migration method with complete observation angle based on tomography theory and pre-stack migration method with double-square-root operator in source-offset domain, needs not select migration aperture.Author points out that such point of view as "there is necessary to consider the effect of migration aperture in all migration method.”is not correct,and moreover,this opinion is not of benefit to developing of migration method in the future.
吴律. 三维叠后投影时间偏移——兼与牟永光商榷偏移孔径问题[J]. 石油地球物理勘探, 2004, 39(3): 359-365.
Wu lü. 3-D Prestack project time migration-discussion about migration aperture with Mr. Mu Yongguang. OGP, 2004, 39(3): 359-365.