Emax conductivity-depth transformation of airborne TEM data
Emax conductivity-depth transformation of airborne TEM data
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DOI：
10.1071/aseg2001ab044
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发表时间：
2001-12
期刊：
影响因子：
--
通讯作者：
P. Fullagar;J. Reid
中科院分区：
文献类型：
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作者：
P. Fullagar;J. Reid
电导率-深度成像是一种方便的地面和机载电磁数据初步解释的演示形式。本文介绍了机载EM适应的Emax电导率-深度转换，最初开发的地面TEM。该变换分两个阶段进行：首先确定在给定延迟时间的视电导率;然后采用电导率等于视电导率的半空间中电流最大值的深度作为当时的视深度。Emax变换的优点是它很容易适应各种TEM数据。缺点是表观电导率不是唯一的，也不总是定义的。在实践中，这通常不会对机载EM的转换造成困难。Emax转换到机载数据的效用通过应用GEOTEM_DEEP总场数据来说明。总场对接收器错误定向提供一定程度的免疫力。
Conductivity-depth imaging is a convenient form of presentation for preliminary interpretation of ground and airborne EM data. This paper describes the airborne EM adaptation of the Emax conductivity-depth transformation, originally developed for ground TEM. The transformation proceeds in two stages: first the apparent conductivity is determined at a given delay time; then the depth of the current maximum in a half-space with conductivity equal to the apparent conductivity is adopted as the apparent depth at that time. The advantage of the Emax transformation is that it is readily adaptable to a wide variety of TEM data. The disadvantage is that apparent conductivity is not unique, nor always defined. In practice this does not usually pose difficulties for transformation of airborne EM. The utility of the Emax transformation to airborne data is illustrated via application to GEOTEM_DEEP total field data. The total field provides a degree of immunity to receiver mis-orientation.