• 责任者：Sun Wenbo (Lab. for Integration of Geology and Geophysics ; China University of Petroleum ; Beijing 102249 ; China) ; Sun Zandong
• 刊名：Chinese Journal of Geophysics
• 出版年：2010
• 卷期：53(9)
• 关键词：伪谱法 ; pseudo-spectral methods ; 深度偏移 ; depth migration
• 页码：p.2196-2203
• 图表：10 illus., 17 refs.
• 分类号：1600
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

This paper mainly introduces VSP reverse time migration (RTM), based on the pseudo-spectra method to solve the two-way wave equations. RTM is a well known imaging method which takes advantage of all the wave phenomena to image complex structures.  In this paper, to remove the wraparound noise caused by the periodic boundary conditions imposed by the Fourier transform, we adopt an efficient technique which is called antiperiodic extension. The diffractor model test shows that VSP RTM introduces migration artifacts in the vicinity of the well. The authors compare the RTM image from the full VSP data with the image from its up-going wave component only, and the authors confirm that the first break and down-going wave are both imaged at the locations of shots and receivers. The graben model and the semicircular model are well imaged by VSP RTM.