Large Scale 3D Inversion of HEM Data Using a Moving Footprint
Large Scale 3D Inversion of HEM Data Using a Moving Footprint
复制标题
DOI：
10.1190/1.2792464
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
L. Cox;M. Zhdanov
中科院分区：
文献类型：
--
作者：
L. Cox;M. Zhdanov
直升机电磁测量是矿山工业的一种标准侦察方法。典型的调查可能覆盖数十到数百平方公里，进行数十万次多频率探测。解释这么大量的数据是有问题的。然而，每个测深点对小于1公里的区域敏感，而不是整个调查区域。我们提出了一种基于积分方程法的反演方案，该方案将整个测量同时反演，每个发射-接收对仅对每个测深点周围相对较小的区域敏感。结果表明，该方法与标准积分方程反演方法一样精确，但反演速度快得多。该技术能够在不到一天的时间内，在一台PC上用超过50万个反演单元和数万个发射机位置反演整个HEM调查。
Helicopter electromagnetic surveying is a standard reconnaissance method in the mining industry. Typical surveys may cover tens to hundreds of square kilometers with hundreds of thousands of multifrequency soundings. Interpreting this volume of data is problematic. Yet each sounding location is sensitive to an area of less than 1 km, not the entire survey area. We suggest an inversion scheme, based on the integral equation method, in which the entire survey is inverted simultaneously with each transmitter-receiver pair being sensitive only to a relatively small area around each sounding location. We show that this method is as accurate as standard integral equation inversion methods, yet it inverts the data much faster. The technique is able to invert entire HEM surveys with over 500,000 inversion cells and tens of thousands of transmitter positions in less than one day on a single PC.