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The Study of Least-Squares Migration Method Based on Split-Step DSR

Huang Jianping1，Xue Zhiguang1，Bu Changcheng2，Li Zhenchun1，Wang Changbo2, Gao Guochao1，Cao Xiaoli1， Li Guolei2   

  1. 1.School of Geosciences，China University of Petroleum，Qingdao266580，Shandong, China;
    2.Shengli Geophysical Research Institute, SINOPEC，Dongying257022, Shandong, China
  • Received:2013-06-30 Online:2014-01-26 Published:2014-01-26

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Abstract:

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.

Key words: least-squares migration, split-step DSR, conjugate gradient, imaging resolution

CLC Number: 

  • P631.4
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