稀疏射线不完全数据层析成像影响因素分析

Analysis of Influence Factors of Incomplete Data Tomography with Sparse Rays

摘要:

针对地震层析成像、爆炸场重建等工程中稀疏射线不完全数据层析成像问题,对影响层析成像结果的观测系统布局方式、初始模型及先验信息3个因素进行了分析；提出了观测系统优化布局的判断指标,并分析了初始模型和先验信息对反演结果的影响程度,通过模型仿真及对反演结果的比较,得到在实际工程中通过对观测系统的优化布局、初始模型合理选取及先验信息的充分利用,可以最大限度地提高反演精度。

Abstract:

This paper aiming at the problems of incomplete data tomography with sparse rays in seismic tomography and explosion field reconstruction, analyses 3 factors which will influence tomography results, that is system layout, initial model and prior information. This paper presents the indexes of system optimal layout, analyses the influence of initial model and prior information to tomography results. A velocity model of explosion is imitated and the inversion results are compared. A conclusion can be gained that system optimal layout, initial model rational selection and prior information sufficient utilization can help to improve inversion precision furthest in practical project. 