频率域航空电磁数据的加权横向约束反演  

Weighted Laterally-constrained inversion of frequency-domain airborne EM data

作　　者：蔡晶[1] 齐彦福 殷长春[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130021

出　　处：《地球物理学报》2014年第3期953-960,共8页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(41274121);国家重大科研装备研制项目(ZDYZ2012-1-03)资助

摘　　要：传统的一维反演技术已经被广泛应用于航空电磁数据解释中.然而,利用单点水平层状介质模型模拟地下复杂地电结构有时会遇到困难.突出表现在反演参数的横向不连续性,即使相邻测点的反演结果也会出现突变.本文针对航空电磁直升机吊舱系统可进行密集采样,相邻测点地下电性结构应具有某种程度连续性的特点,研究航空电磁数据横向约束反演理论,并提出参数加权约束方法.首先阐述频率域航空电磁正演和加权横向约束反演理论,着重介绍这种拟二维反演方法的基本原理和实施步骤,以及将该方法成功应用于频率域航空电磁数据反演处理的方法技术.最后,通过对理论和实测数据反演处理,并与传统的一维反演结果进行对比,验证加权横向约束反演方法的有效性.Traditional 1D inversions have been widely used in the airborne EM data processing and interpretation. However, the inversion at a single survey station for the complex underground structure can sometimes be problematic. Some serious problems may occur, such as the inverted earth parameters at neighbor stations change sharply, the inverted layer interfaces have strong lateral discontinuities. Taking into account the fact that airborne EM systems have very high spatial sampling, while the underground structures under the neighbor stations should be continuous to some extent, we put forward in this paper the laterally-constrained inversion （LCI） and make further improvements by adding different weights to each inversion parameter. We first discuss the AEM forward modeling and WLCI algorithm, focusing on the theory and inversion techniques, followed by how to apply it for the frequency-domain AEM inversions. We check the effectiveness of the technique by implementing it to both synthetic and survey data and comparing the results with those from other conventional inversions.

关 键 词：航空电磁 频率域 正演 横向加权约束反演 

分 类 号：P631[天文地球—地质矿产勘探]