改进的非均匀介质射线追踪算法

发布时间：2018-04-29 14:25

本文选题：非均匀介质 + 常梯度　；参考：《地球物理学进展》2017年04期

【摘要】：本文对1985年Langan提出的非均匀介质常速度梯度射线追踪方法进行了改进以提高精确度.常速度梯度射线追踪法利用Taylor展开将复杂的射线方程简化大量提高了运算效率,但也由于网格化造成精度降低的不足.本文对每个网格中的射线追踪结果进行了校正,减小误差的相互累积来提高原方法的精确度.利用理论模型对改进的方法进行了试算,将试算结果与原始的方法进行了对比,改进后算法得到的射线路径与原始方法得到的射线路径有明显的差别,并将原始方法和改进方法得到的结果与理论上的结果进行了对比.同时,将两种方法应用于某一地区的微地震资料中,将两种方法得到的微地震事件走时正演数据与实际的走时数据进行了对比分析.本文从理论模型和实际资料上同时验证了改进的方法提高了射线追踪的精确度.
[Abstract]:In this paper, the method of constant velocity gradient ray tracing proposed by Langan in 1985 is improved to improve the accuracy. The Taylor expansion is used to simplify the complex ray equation in the constant velocity gradient ray tracing method, which greatly improves the computational efficiency, but it also reduces the precision due to gridding. In this paper, the ray tracing results in each grid are corrected to reduce the mutual accumulation of errors to improve the accuracy of the original method. The improved method is calculated by using the theoretical model, and the results are compared with the original method. The ray path obtained by the improved algorithm is obviously different from the ray path obtained by the original method. The results obtained by the original method and the improved method are compared with the theoretical results. At the same time, the two methods are applied to the micro-seismic data in a certain area, and the forward data of the micro-seismic events obtained by the two methods are compared with the actual data. In this paper, both theoretical model and practical data show that the improved method improves the accuracy of ray tracing.
【作者单位】：油气资源与勘探技术教育部重点实验室(长江大学);中石化重庆涪陵页岩气勘探开发有限公司;
【基金】：国家自然科学基金项目(41604099) 油气资源与勘探技术教育部重点实验室(长江大学)开放基金资助项目(K2016-01)联合资助
【分类号】：P631.4

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