基于P-SV波分离的VTI介质射线追踪方法

  • 郭恺 ,
  • 王鹏燕 ,
  • 娄婷婷
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  • 1.中国石油化工股份有限公司石油物探技术研究院,江苏 南京 211103
    2.华润(南京)市政设计有限公司,江苏 南京 210000

作者简介:郭恺(1985-),男,山东潍坊人,高级工程师,主要从事各向异性参数建模方法及偏移成像方法研究.E-mail:guokai_leon@163.com

收稿日期: 2015-03-02

  修回日期: 2015-07-30

  网络出版日期: 2015-09-20

版权

, 2015,

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

  • Kai Guo ,
  • Pengyan Wang ,
  • Tingting Lou
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  • 1 Sinopec Geophysical Research Institute, Nanjing 211103, China
    2 China resource(Nanjing) Municipal Design Co.Ltd, Nanjing 210000, China

Received date: 2015-03-02

  Revised date: 2015-07-30

  Online published: 2015-09-20

Copyright

地球科学进展 编辑部, 2015,

摘要

近年来,VTI介质参数建模和成像技术发展迅速,其中VTI介质射线追踪是基础,其精度和稳定性直接影响建模和成像的效果。VTI介质射线追踪大多通过前人提出的频散关系推导出程函方程和射线方程,该方法主要基于纵横波相互独立的假设,采用令横波速度等于零的手段,在某些特殊情况下精度较低、稳定性较差。针对其缺点提出一种新的射线追踪方法,该方法基于P=SV波分离得到的qP波频散关系,从而推导出程函方程和射线方程,提高了精度和稳定性。最后通过模型试算验证该方法的正确性和稳定性。

本文引用格式

郭恺 , 王鹏燕 , 娄婷婷 . 基于P-SV波分离的VTI介质射线追踪方法[J]. 地球科学进展, 2015 , 30(9) : 1028 -1033 . DOI: 10.11867/j.issn.1001-8166.2015.09.1028

Abstract

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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