瞬变电磁测深数据的灵敏度分析  

A SENSITIVITY STUDY FOR TRANSIENT ELECTROMAGNETIC SOUNDING DATA

作　　者：杨鑫[1] 熊彬[2] 

机构地区：[1]中南大学信息物理工程学院,湖南长沙410083 [2]桂林理工大学地球科学学院,广西桂林541004

出　　处：《物探化探计算技术》2011年第4期401-410,347,共10页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金项目(40974077);国家高技术研究发展计划项目(2007AA06Z134);高等学校博士学科点专项科研基金新教师项目(20070533104)

摘　　要：灵敏度反映了观测数据对模型参数变化的响应情况,灵敏度分析可用于考察某种地球物理探测方法对特定地质异常体的分辨能力,或帮助选择合适的探测方法。灵敏度计算也是迭代反演方法中最为关键的环节,它决定了反演的精度与速度,这里对多例典型地电模型(厚覆盖层、低阻覆盖层和高阻覆盖层)的灵敏度进行了计算,得出了该方法对不同模型的各个参数变化的响应。Sensitivities indicate the relative change in the observed data caused by a change in the model space. A sensitivity study could be used to investigate the resolution capabilities of exploration methods for given model or choose proper method. The most important step in iterative inversion algorithms is calculating sensitivity, which the efficiency and accuracyare depended on. We obtain the change in electromagnetic response caused by a change of parameters in different model space by calculating sensitivities for several representative models, concentrating on the influence of a thick overburden, and a conductive or resistive overburden is present.

关 键 词：瞬变电磁 垂直磁偶极子 一维模型 灵敏度 偏导数 

分 类 号：P631.325[天文地球—地质矿产勘探]