Improved fast marching method for higher calculation accuracy and efficiency of traveltime
Li Yongbo1, Li Qingchun2, Wu Qiong1, Wang Dayong1, Jin Da3
1. Institute of Geophysical and Geochemical Exploration, CAGS, Langfang, Hebei 065000, China;
2. College of Geology Engineering and Geomatics, Chang'an University, Xi'an, Shaanxi 710054, China;
3. Geophysical Research Institute, Zhongyuan Oilfield Branch Co., SINOPEC, Puyang, Henan 457001, China
Abstract:The fast marching method (FMM) is a ray tracing method based on the grid, and its calculation accuracy and efficiency of traveltime are affected by finite-difference schemes and grid size. To have higher calculation accuracy and efficiency of traveltime, we propose an improved fast marching method, which includes following measures: diagonal point calculation; the improved first-order difference; and Vidale finite difference; and combining the double grids with the above measures. Model tests show that the first measure can improve the accuracy of the first-order difference, and the other measures can improve traveltime calculation accuracy and efficiency in different degree. The proposed improved fast marching method strengthens its adaptability and provides some references for other ray tracing methods.
李永博, 李庆春, 吴琼, 王大勇, 晋达. 快速行进法射线追踪提高旅行时计算精度和效率的改进措施[J]. 石油地球物理勘探, 2016, 51(3): 467-473.
Li Yongbo, Li Qingchun, Wu Qiong, Wang Dayong, Jin Da. Improved fast marching method for higher calculation accuracy and efficiency of traveltime. OGP, 2016, 51(3): 467-473.
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