Seismic multi-wave traveltime tomography in 3D TI media

被引：0
|
作者：
Huang G. [1 ]
Sun J. [2 ]
Bai C. [3 ]
Qian W. [1 ]
机构：
[1] Department of Geology Science & Engineering, School of Earth Sciences and Engineering, Hohai University, Nanjing, 211100, Jiangsu
[2] Jiangsu Geological Archives, Nanjing, 210018, Jiangsu
[3] Department of Geophysics, College of Geology Engineering and Geomatics, Chang'an University, Xi'an, 710054, Shaanxi
来源：
Shiyou Diqiu Wuli Kantan/Oil Geophysical Prospecting | 2018年 / 53卷 / 01期
关键词：
Elastic parameter inversion; Multi-wave traveltime; TI media; Traveltime tomography;
D O I：
10.13810/j.cnki.issn.1000-7210.2018.01.008
中图分类号：
学科分类号：
摘要：
The conventional anisotropic tomography is based on a weak anisotropy assumption,mainly uses the traveltime to carry out linear inversion and ignores the lateral changes in the media,so inversion results are usually not reliable.Therefore,we study a multi-wave traveltime tomography in 3D TI media.The multi-step irregular shortest path method in isotropic media is extended to 3D TI media to trace multi-wave (reflected wave,transmitted wave,and converted wave) arrivals,and the algorithm for inversion in isotropic media is used.Incorporating with the equation for phase and group velocity derivatives,5 anisotropic elastic parameters are inverted simultaneously by multi-wave traveltimes.This method does not assume that medium is weakly anisotropic whether in ray tracing and traveltime calculation,or in an inversion equation establishment,or in Jacobian matrix calculation.What is more,ray paths and traveltimes are re-tracked at each iteration,and Jacobian matrix elements are updated.So this method is suitable for multi-wave traveltime tomography in 3D TI media.Numerical test results indicate that the proposed method can improve the imaging spatial resolution. © 2018, Editorial Department OIL GEOPHYSICAL PROSPECTING. All right reserved.
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页码：63 / 72
页数：9
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