Advances in Earth Science ›› 2015, Vol. 30 ›› Issue (9): 1028-1033. doi: 10.11867/j.issn.1001-8166.2015.09.1028

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A New Ray Tracing Method for VTI Medium Based on Separated P-SV Waves

Kai Guo 1( ), Pengyan Wang 1, Tingting Lou 2   

  1. 1 Sinopec Geophysical Research Institute, Nanjing 211103, China
    2 China resource(Nanjing) Municipal Design Co.Ltd, Nanjing 210000, China
  • Received:2015-03-02 Revised:2015-07-30 Online:2015-09-20 Published:2015-09-20

Kai Guo, Pengyan Wang, Tingting Lou. A New Ray Tracing Method for VTI Medium Based on Separated P-SV Waves[J]. Advances in Earth Science, 2015, 30(9): 1028-1033.

In recent years, modeling and imaging techniques for VTI medium have developed rapidly. Ray tracing in VTI medium is the key issue, whose precision and stability directly affect the results of modeling and imaging. Ray tracing in VTI medium is usually based on the eikonal equation and ray equation derived from the dispersion relation of Alkhalifah (2000). The assumption is that the P wave and S wave are independence, and the velocity of S wave is zero. Thus, in some particular cases, this method is lack of accuracy and stability. In this paper, a new ray tracing method was proposed to overcome this problem. We separated P-SV waves to get the phase velocity of the qP wave, and then to get the eikonal equation and ray equation of qP wave, through which the precision and stability were improved. At the end, numerical tests were made to prove the effectiveness of this method.

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