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

页码：363 / 371

页数：9

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