初至波地震层析技术及其在四川复杂地区的应用  

First-arrival seismic tomography and its application in complex area of Sichuan

作　　者：陈爱萍[1] 梁波[1] 邹文[1] 何光明[1] 李亚林[1] 李志荣[1] 

机构地区：[1]四川石油管理局地球物理勘探公司,四川成都610213

出　　处：《世界地质》2006年第4期440-444,449,共6页World Geology

摘　　要：近地表速度场的重建是获得准确静校正量的关键。根据实际地震数据的初至波时间建立初始速度模型;采用改进的最短路径射线追踪算法进行正演;利用改进的约束带阻尼联合迭代重建技术(CDSIRT)求解大型、稀疏的方程组来反演近地表的速度场。理论模型和实际资料的反演结果表明,该方法能稳定、快速、准确地重建复杂地区的近地表速度场,建立准确的近地表速度场,从而可计算准确的静校正量,保证复杂地区的构造成像。Rebuilding near-surface velocity field is very important for calculating statics. The authors established an initial velocity model based on the first break time of the actual data, then realized the forward calculation with the improved shortest path ray tracing algorithm, and applied the improved constrained damped simultaneous iterative reconstruction technique （CI）SIRT） to solve large-scale and sparse equations for inversing the near-surface velocity field. The inversion results of the theory model and actual data show that the method can reconstruct near-surface velocity field of complex structure stably, quickly and accurately, thus, can calculate the statics and ensure structural imaging in complex area.

关 键 词：地震层析技术 初至波 近地表速度场 最短路径射线追踪 约束阻尼联合迭代重构技术 

分 类 号：P315.63[天文地球—地震学]