Simultaneous elastic parameter inversion in 2-D/3-D TTI medium combined later arrival times

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• 作者：Chao-ying Bai ; Tao Wang ; Shang-bei Yang ; Xing-wang Li…
• 关键词：Multistage irregular shortest ; path ray tracing ; Non ; linear inversion solver ; TTI medium ; Elastic parameters ; Later arrival ; Simultaneous anisotropic parameter inversion
• 刊名：Journal of Seismology
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：20
• 期：2
• 页码：475-494
• 全文大小：3,994 KB
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• 作者单位：Chao-ying Bai (1) (2)
  Tao Wang (1) (3)
  Shang-bei Yang (1)
  Xing-wang Li (1)
  Guo-jiao Huang (4)
  
  1. Department of Geophysics, College of Geology Engineering and Geomatics, Chang’an University, Xi’an, 710054, China
  2. Institute of Computing Geophysics, Chang’an University, Xi’an, 710054, China
  3. Shaanxi railway Institute, Weinan, 714000, China
  4. Department of Geology Science and Engineering, School of Earth Sciences and Engineering, Hohai University, Nanjing, 210098, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Structural Geology
  Hydrogeology
  Geotechnical Engineering
  
• 出版者：Springer Netherlands
• ISSN：1573-157X

文摘

Traditional traveltime inversion for anisotropic medium is, in general, based on a “weak” assumption in the anisotropic property, which simplifies both the forward part (ray tracing is performed once only) and the inversion part (a linear inversion solver is possible). But for some real applications, a general (both “weak” and “strong”) anisotropic medium should be considered. In such cases, one has to develop a ray tracing algorithm to handle with the general (including “strong”) anisotropic medium and also to design a non-linear inversion solver for later tomography. Meanwhile, it is constructive to investigate how much the tomographic resolution can be improved by introducing the later arrivals. For this motivation, we incorporated our newly developed ray tracing algorithm (multistage irregular shortest-path method) for general anisotropic media with a non-linear inversion solver (a damped minimum norm, constrained least squares problem with a conjugate gradient approach) to formulate a non-linear inversion solver for anisotropic medium. This anisotropic traveltime inversion procedure is able to combine the later (reflected) arrival times. Both 2-D/3-D synthetic inversion experiments and comparison tests show that (1) the proposed anisotropic traveltime inversion scheme is able to recover the high contrast anomalies and (2) it is possible to improve the tomographic resolution by introducing the later (reflected) arrivals, but not as expected in the isotropic medium, because the different velocity (qP, qSV and qSH) sensitivities (or derivatives) respective to the different elastic parameters are not the same but are also dependent on the inclination angle.