Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (1): 148-153.doi: 10.12108/yxyqc.20220115

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Least-squares reverse time migration in visco-acoustic medium based on GPU parallel acceleration and its application

ZHANG Meng   

  1. Geophysical Research Institute, Sinopec Shengli Oilfield Company, Dongying 257022, Shandong, China
  • Received:2021-06-07 Revised:2021-09-02 Online:2022-01-01 Published:2022-01-21

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Abstract: Conventional reverse time migration(RTM) algorithm is easy to produce strong low-frequency noise in shallow imaging, which cannot eliminate the absorption attenuation effect of earth medium. Based on the generalized standard linear solid model, the visco-acoustic wave equation was established, GPU acceleration was carried out in the two core algorithms of Born forward and gradient calculation, and the implementation process of leastsquares reverse time migration algorithm in visco-acoustic medium was proposed. The method was applied to a 3D data in the exploration area of Shengli Oilfield. The results show that the calculation efficiency and migration imaging quality are improved effectively. The comparison with conventional acoustic least-squares reverse time migration was carried out. The results show that this method is of great significance to improve the imaging accuracy of deep reservoirs, realize true amplitude imaging, and explore lithologic reservoirs.

Key words: GPU parallel acceleration, visco-acoustic medium, least-squares reverse time migration, wave equation

CLC Number: 

  • P631.4
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