Study on approach of ray-tracing of refraction first breaks
Du Zeng-li1,2, Shi Ze-jin2, Yin Cheng3, Liu Wen-ge2, Jiang Qing-guo4
1. Sichuan Geophysical Company, Huayang Town, Shuangliu County, Chengdu City, Sichuan Province, 610213, China;
2. State Key Lab of Reservoir Geology and Development Engineering, Chengdu University of Technology, Chengdu City, Sichuan Province, 601159, China;
3. Southwest Petroleum University, Chengdu City, Sichuan Province, 610500, China;
4. Geophysical Prospecting Company, Daqing Petroleum Administration, Daqing City, Heilongjiang Province, 163357, China
Abstract：There is large difference in near-surface velocity structure between the results of uphole survey and traditional ray-tracing algorithm in complex surface area, the main reason of which is lower precision of computed ray path. The traditional non-linear interpolation based on travel-time square although improved the computational precision of ray path and travel time, the algorithm is not suitable for the area the velocity violently changed. Based on analyzing the error source of this kind of non-linear interpolation, the paper improved the algorithm, using non-linear travel-time interpolation to compute ray path and travel time of seismic first breaks on the basis of fully considering various possible ray paths. The numeric computational results showed that the approach can use sparse computational grid in a precondition of guaranteeing computational precision of seismic travel times, improving efficiency of ray tracing and can suitable for various complex velocity structures.
杜增利, 施泽进, 尹成, 刘文革, 姜庆国. 折射初至波射线追踪方法研究[J]. 石油地球物理勘探, 2008, 43(4): 401-404.
Du Zeng-li, Shi Ze-jin, Yin Cheng, Liu Wen-ge, Jiang Qing-guo. Study on approach of ray-tracing of refraction first breaks. OGP, 2008, 43(4): 401-404.
