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《Journal of Jilin University(Earth Science Edition)》 2014-01
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The Study of Least-Squares Migration Method Based on Split-Step DSR

Huang Jianping;Xue Zhiguang;Bu Changcheng;Li Zhenchun;Wang Changbo;Gao Guochao;Cao Xiaoli;Li Guolei;School of Geosciences,China University of Petroleum;Shengli Geophysical Research Institute,SINOPEC;Shengli Geophysical Research Institute.SINOPEC;  
In order to adapt for the exploration and development of complex structures and lithologic hydrocarbon reservoirs,least-squares migration method applying inversion is proposed.In this paper, based on the basic theory of least-squares migration(LSM),we deduced the forward propagator and its adjoint of back propagator,and then LSM based on split-step DSR was implemented.We tested this algorithm via four layers and SEG/EAGE Marmousi velocity model.The image results demonstrate that LSM has not only a high image resolution for the complex media,in addition,there will be a better image quality than conventional migration method after several iterations of conjugate gradient method for some local regions in the follow aspects:1)the image resolution is highly improved;2)A better imaging energy compensation for the deeper part of the model.
【Fund】: 国家自然科学基金项目(41104069 41274124);; 国家“973”计划项目(2014CB239006);; 山东省自然科学基金项目(ZR2011DQ016);; 中央高校基本科研业务费专项基金项目(R1401005A)
【CateGory Index】: P631.4
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