Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (5): 1530-1538.doi: 10.13278/j.cnki.jjuese.201505302

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Viscoacoustic Gaussian Beam Prestack Depth Migration

Wu Juan1,2, Chen Xiaohong1,2, Bai Min1,2   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
    2. National Engineering Laboratory for Offshore Oil Exploration, China University of Petroleum, Beijing 102249, China
  • Received:2014-12-22 Published:2015-09-26

Abstract:

Gaussian beam migration is an effective and efficient depth migration method with its accuracy comparable to the wave equation migration and its flexibility comparable to Kirchhoff migration. The viscoacoustic prestack depth migration is of practical significance because it considers the viscosity of the subsurface media. Gaussian beam migration is used to perform seismic data compensation for frequency dependent absorption and dispersion. Gaussian beam prestack depth migration algorithms that operate on common-shot gathers are presented to derive expressions about attenuation and compensation which correct amplitude attenuation and phase distortion caused by Q in order to realize Gaussian beam prestack depth migration. The numerical modeling suggests that the viscoacoustic Gaussian beam prestack depth migration have a higher imaging resolution than the acoustic Gaussian beam prestack depth when the viscosity of the subsurface is considered.

Key words: Gaussian beam, attenuation and compensation, viscoacoustic, Green function, prestack depth migration

CLC Number: 

  • P631.4

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