Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (5): 133-142.doi: 10.12108/yxyqc.20200514

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Preconditioning elastic least-squares reverse time migration

LIU Mengli, XU Xingrong, WANG Xiaowei, HU Shuhua, LIU Jintao   

  1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China
  • Received:2019-12-24 Revised:2020-02-28 Online:2020-10-01 Published:2020-08-08

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Abstract: Compared to P-wave seismic exploration,multi-wave seismic exploration can attain more information of underground medium. Elastic reverse time migration is a more accurate method for imaging. Leastsquares inverse time migration(LSRTM)treats the migration imaging as an inversion problem in the sense of least squares, which is a correction of the migration imaging process and results, and can provide reflectance images with higher resolution for lithologic reservoir estimation,which has become the trend of imaging method. Based on the establishment of a linear first-order velocity-stress elastic wave equation,the application of adjoint state method helped to reconstruct the reverse-time migration algorithm,and by introducing the theory of leastsquares and using the inverse of approximate Hessian matrix to precondition the gradient,preconditioning elastic least-squares reverse time migration(P-ELSRTM)was implemented. The numerical tests on SEG/EAGE 2-D salt dome model show that compared with the conventional elastic least-squares reverse time migration(ELSRTM), P-ELSRTM can image with higher resolution,better amplitude preservation and faster convergence. In addition,P-ELSRTM is more adaptable to seismic data with random noise.

Key words: least-squares migration, elastic reverse time migration, amplitude preservation

CLC Number: 

  • P631.4
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