2.5D inversion of airborne electromagnetic data

被引：45
作者：
Wilson, G. A. [1 ]
Raiche, A. P. [1 ]
Sugeng, F. [1 ]
机构：
[1] CSIRO, Div Explorat & Min, N Ryde, NSW 1670, Australia
来源：
EXPLORATION GEOPHYSICS | 2006年 / 37卷 / 04期
关键词：
2.5D; airborne; electromagnetic; modelling; inversion;
D O I：
10.1071/EG06363
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
2.5D electromagnetic (EM) modelling computes the response of a 3D source from an arbitrary 2D geoelectrical model. As such, it is practical for airborne EM (AEM) data to be inverted using 2.5D modelling provided that the geoelectrical cross-section is relatively constant along a strike length that exceeds the AEM system footprint. The program ArjunAir is introduced for modelling and inversion based on a 2D finite-element method that enables the accurate simulation of 3D source excitation for full domain models inclusive of topography, non-conforming boundaries, and very high resistivity contrasts. Inversion is based on an iterative Gauss-Newton method that is solved using the damped eigenparameter algorithm. Examples are presented for synthetic and practical frequency and time-domain AEM surveys for which inversion run-times are on the order of hours.
引用
收藏
页码：363 / 371
页数：9
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