网格尺度对走时层析成像结果的影响分析及对策

网格尺度对走时层析成像结果的影响分析及对策 The Analysis and the Solution of the Grid Size Problem to Travel-Time Tomography 王敬 WANG Jing1 1 first-author 杨艳 YANG Yan1 1 胡英 HU Ying3 2 张小磊 ZHANG Xiaolei1 1 张东 ZHANG Dong1 1 秦前清 QIN Qianqing2 3 武汉大学物理科学与技术学院 武汉大学物理科学与技术学院 School of Physics and Technology,Wuhan University School of Physics and Technology,Wuhan University 中国石油勘探开发研究院物探技术研究所 中国石油勘探开发研究院物探技术研究所 Department of Geophysical Technology,Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation Department of Geophysical Technology,Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation 武汉大学 测绘遥感信息工程国家重点实验室 武汉大学 测绘遥感信息工程国家重点实验室 State Key Laboratory of Information Engineering in Surveying of Mapping and Remote Sensing, Wuhan University State Key Laboratory of Information Engineering in Surveying of Mapping and Remote Sensing, Wuhan University 基于网格剖分的走时层析算法反演地下地质结构,在地震走时数据采集精度确定、炮点接收点固定的条件下,要选择一个适当的网格尺度.本文分析了不同网格尺度对层析结果精度的影响,网格尺度过大,走时层析算法不能准确反演地下地质结构;网格尺度过小,反演结果包含过多插值的结果,反演精度不高,且会增加工作量和研究时间,对层析成像无实际意义.因此选择合适的网格尺度对层析成像结果的精度和算法的计算效率都有意义.本文以实际地质勘探为例,根据炮点接收点的位置对走时层析成像的影响,选取走时层析成像算法的最佳网格尺度. An appropriate choice should be make about the scale of grid under the conditions that the seismic travel time data acquisition accuracy is certain and the shot point and receive point is fixed.This paper analyzes the different grid scale’s influence on the accuracy of tomography results,and considers that if the grid scale is too large,the travel time tomography algorithm cannot be able to inverse of the correct subsurface geological structure,but if the grid scale is too small,the inversion results are imprecise in that there are too many interpolation data,and it will increase the calculated amount and time,that is meaningless to the tomography.Therefore,it is significative to choose an appropriate grid scale which can improve the precision of inversion results and computational efficiency.This paper takes the real geological exploration data as example,according to the affection of the position of the receiving point and the shot point on travel time tomography.And then choose the best grid scale to apply in the real geology travel time tomography. 层析成像 网格剖分 离散化 网格尺度 正演 反演 tomography grid division discretization grid size forward inversion 10.14188/j.1671-8836.2013.04.018 P631.4 国家科技重大专项资助项目（2011ZX05003-003） 2013-04-01 2021-04-01 4 59