Joint 3D traveltime calculation based on fast marching method and wavefront construction
Joint 3D traveltime calculation based on fast marching method and wavefront construction
复制标题
DOI：
10.1007/s11770-017-0611-3
复制
发表时间：
2017-04
影响因子：
0.7
通讯作者：
Hui-Dong Sun;Jianguo Sun;Zhangqing Sun;Fuxing Han;Zhiqiang Liu;Mingchen Liu;Zhenghui Gao;Xiulin Shi
中科院分区：
文献类型：
--
作者：
Hui-Dong Sun;Jianguo Sun;Zhangqing Sun;Fuxing Han;Zhiqiang Liu;Mingchen Liu;Zhenghui Gao;Xiulin Shi
三维走时计算在地震偏移、层析成像等地震勘探技术中有着广泛的应用。快速推进法（FMM）是一种有效的三维走时计算方法，已被证明是有效和稳定的。然而，它在源附近的计算精度较低，因此整体精度较低。本文提出了一种联合走时计算方法来解决这一问题。该方法首先采用波前构造法（WFC）计算震源附近小区域的走时，该方法比FMM具有更高的计算精度;然后采用FMM计算其余网格节点的走时。由于提高了源附近网格节点的计算精度，新算法在保持FMM高计算效率的同时，具有良好的计算精度。使用各种数值模型验证结果。
3D traveltime calculation is widely used in seismic exploration technologies such as seismic migration and tomography. The fast marching method (FMM) is useful for calculating 3D traveltime and has proven to be efficient and stable. However, it has low calculation accuracy near the source, which thus gives it low overall accuracy. This paper proposes a joint traveltime calculation method to solve this problem. The method firstly employs the wavefront construction method (WFC), which has a higher calculation accuracy than FMM in calculating traveltime in the small area near the source, and secondly adopts FMM to calculate traveltime for the remaining grid nodes. Due to the increase in calculation precision of grid nodes near the source, this new algorithm is shown to have good calculation precision while maintaining the high calculation efficiency of FMM, which is employed in most of the computational area. Results are verified using various numerical models.