A fast and robust two‐point ray tracing method in layered vertical transversely isotropic media with strong anisotropy

IF 1.8 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Xingda Jiang, Xiaoyan Pan, Huayong Yang, Wei Zhang, Xiaofei Chen
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引用次数: 0

Abstract

A fast and robust two‐point ray tracing method was developed for layered vertical transversely isotropic media with strong anisotropy. Utilizing the Christoffel slowness equation, a novel generalized dimensionless ray parameter, , modified from the ray parameter (horizontal slowness), was proposed to efficiently and simultaneously determine the ray paths and travel times for direct and reflected quasi‐P, quasi‐SV and quasi‐SH waves. The Newton optimization algorithm was employed to solve the nonlinear offset equation accurately, resulting in rapid convergence to the true value. The inferred analytical equations show that the generalized ray parameter stabilizes the inversion process at large offsets. Additionally, a piecewise function was introduced to enhance the initial value estimation and calculation efficiency. The numerical results demonstrate that this novel approach can reduce the iteration error to 10−10 m in less than three iterations. Monte Carlo simulations further validated the effectiveness of the method for inferring the true ray paths at various offsets within complex velocity models. Furthermore, the method can address the triplication issue in quasi‐SV waves and exhibit robustness in strong‐layered vertical transversely isotropic media.
具有强各向异性的层状垂直横向各向同性介质中的快速稳健双点射线追踪方法
针对具有强各向异性的层状垂直横向各向同性介质,开发了一种快速、稳健的两点射线追踪方法。利用克里斯托弗慢度方程,提出了一种新的广义无量纲射线参数,即从射线参数(水平慢度)修改而来的Ⅳ,以高效地同时确定直射波、反射波和准P波、准SV波和准SH波的射线路径和行进时间。采用牛顿优化算法精确求解非线性偏移方程,从而快速收敛到真实值。推导出的分析方程表明,广义射线参数能在大偏移量时稳定反演过程。此外,还引入了一个片断函数,以提高初值估计和计算效率。数值结果表明,这种新方法可以在不到三次的迭代中将迭代误差降低到 10-10 m。蒙特卡罗模拟进一步验证了该方法在复杂速度模型中推断不同偏移量下真实射线路径的有效性。此外,该方法还能解决准 SV 波中的三重问题,并在强层垂直横向各向同性介质中表现出鲁棒性。
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来源期刊
Geophysical Prospecting
Geophysical Prospecting 地学-地球化学与地球物理
CiteScore
4.90
自引率
11.50%
发文量
118
审稿时长
4.5 months
期刊介绍: Geophysical Prospecting publishes the best in primary research on the science of geophysics as it applies to the exploration, evaluation and extraction of earth resources. Drawing heavily on contributions from researchers in the oil and mineral exploration industries, the journal has a very practical slant. Although the journal provides a valuable forum for communication among workers in these fields, it is also ideally suited to researchers in academic geophysics.
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