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Journal of Seismology

, Volume 19, Issue 2, pp 607–621 | Cite as

2D/3D multi-phase Fresnel volume rays and applications to simultaneously update both velocity model and reflector geometry

  • Chao-ying Bai
  • Xing-wang Li
  • Guo-jiao Huang
Original Article
  • 112 Downloads

Abstract

Theoretically, Fresnel volume ray theory is more suitable for handling real seismic propagation problems because the traveltime depends not only on the velocity distribution along a traditional geometric ray but also on the velocity distribution within a vicinal region (referred to as first Fresnel volume, abbreviated as FFV) which embraces the geometric ray. In this study, we used an exact solution to calculate multi-phase FFV rays for both 2-D and 3-D cases and introduced a normalized coefficient to account for different contributions inside the FFV ray on the traveltimes. Furthermore, we draw a new formula to calculate the partial traveltime derivatives with respective to the velocity variations and depth changes of the reflectors and finally present a simultaneous inversion method for updating both velocity field and reflector geometry by using these multi-phase FFV rays for both in 2-D and 3-D cases. Using synthetic data examples, we compare the reconstructions of the velocity field and the reflector geometry using the FFV ray tomographic methods and the traditional ray tomography approaches. The simulated inversion results for both 2-D and 3-D cases show that the FFV ray tomographic method is advantageous over the traditional ray tomography method, especially when the ray density is relatively low. The other advantage for the FFV ray tomography method is that it can capture the coarse velocity structure and reflector geometry by starting with a low-frequency data set and then map the fine velocity structure and the detailed reflector geometry by using a high-frequency data set.

Keywords

First Fresnel volume Multi-phase FFV ray tracing Simultaneous traveltime inversion Seismic ray tomography 2-D/3-D cases 

Notes

Acknowledgments

This research work was partially supported by the Doctoral Programming Research Fund of Higher Education, Chinese Ministry of Education (Project No: 20110205110010).

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.Department of Geophysics, College of Geology Engineering and GeomaticsChang’an UniversityXi’anChina
  2. 2.Institute of Computing GeophysicsChang’an UniversityXi’anChina
  3. 3.Department of Geology Science and Engineering, School of Earth Sciences and EngineeringHohai UniversityNanjingChina

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