Xinjiang Petroleum Geology

Xinjiang Petroleum Geology ›› 2010, Vol. 31 ›› Issue (6): 654-656.

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Simultaneous Imaging of Ray Tomography and Wave Equation

XIONG Gao-jun1,2, XIAO You-jun1, PENG Geng-xin1, HE Zhen-hua3, WANG Xu-ben3   

  1. 1. Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China;
    2. Research Center of Intelligent Information Processing, College of Information, South China University of Agriculture, Guangzhou, Guangdong 510640, China;
    3. MOE Key Laboratory of Earth Exploration and Information Technology, Chengdu University of Technology, Chengdu, Sichuan 610059, China
  • Received:2009-06-25 Revised:2010-05-31 Published:2021-01-18

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Abstract: In this paper, a simultaneous imaging of the velocity and structure is presented by composition of ray tomography and wave equation. Depth deviation calculation is based on migrated common imaging trace gather, by which the allowance of velocity is gained. This allowance is evenly distributed along ray path from top to bottom layers for modifying the velocity model layer by layer. And the modified velocity is used for wave equation migration to get common imaging trace gather, and calculating a new velocity allowance, and then, evenly distributing along the ray path. Such inversion and iteration of wave equation migration and ray tomography are conducted until the common imaging trace gather depth variance meets the preset accuracy. Finally, the simultaneous imaging of the velocity and depth structure is obtained. This method has been verified by simulation experiment.

Key words: wave equation migration, common imaging trace gather, ray tracing, velocity modification

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