| 大定源瞬变电磁均匀层状介质正演计算 |
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| 引用本文： | 柳建新,张维,曹创华,蔡盛. 大定源瞬变电磁均匀层状介质正演计算[J]. 物探化探计算技术, 2014, 0(2): 129-133 |
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| 作者姓名： | 柳建新 张维 曹创华 蔡盛 |
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| 作者单位： | [1]中南大学地球科学与信息物理学院,长沙410083 [2]有色资源与地质灾害探查湖南省重点实验室,长沙410083 [3]中南大学地质调查研究院,长沙410083 |
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| 基金项目： | 国家863计划项目（SS2013AA060115）;国家科技支撑计划项目（2011BAB04808）;中国地质调查局科研项目（资[2011]03-01-64）;国家自然科学基金（41174103）;教育邵博士点基金（20110162130008）;有色资源与地质灾害探查湖南省重点实验室项目（2010TP4012-6） |
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| 摘 要： | 大定源回线瞬变电磁法以其高效的工作方式,一直备受野外工作者青睐。这里从基本理论出发,给出了大定源回线发射源在均匀层状介质的电磁响应计算公式,利用Quadrature With Extrapolation(QWE)算法计算了线框内、外的垂向磁场响应,并将其与传统的Fast Hankel Transform(FHT)算法进行了对比分析,两者对于虚部的计算都比较准确。当发射线框位于地表以上一定高度时,两者的计算结果吻合的较好。在发射线圈位于地表的时候,QWE算法的计算结果比较稳定,适用性优于FHT。
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| 关 键 词： | 大定源回线 QWE FHT 垂向磁场响应 |
Computation of a large loop source transient electromagnetic response over layered earth model |
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| LIU Jian-xin,ZHANG Wei,CAO Chuanghua,CAI Sheng. Computation of a large loop source transient electromagnetic response over layered earth model[J]. Computing Techniques For Geophysical and Geochemical Explorationxploration, 2014, 0(2): 129-133 |
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| Authors: | LIU Jian-xin ZHANG Wei CAO Chuanghua CAI Sheng |
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| Affiliation: | 1. School of Geosciences and Info Physics, Central South University, Changsha 410083, China; 2. Key Laboratory of Non ferrous Resources and Geological Detection, Ministry of Hunan Province, Changsha 410083, China; 3. Institute of Geological Survey, Central South University, Changsha 410083, China) |
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| Abstract: | Because of the highly efficiency of this method, large loop source transient electromagnetic method is widely used by geophysical prospecting workers. Based upon the basic theory, this article has deduced electromagnetic expressions over layered earth model induced by large loop source. Then the magnetic vertical components inside and outside the loop are computed by quadrature with extrapolation （QWE）. Comparing with the results from fast hankel transform （FHT）, both methods per formed well for the imaginary component. And when the transmit loop was located few meters away from the model surface, the results of the two method performed well, but when the loop located on the surface, QWE performed better than FHT. |
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| Keywords: | large loop source QWE FHT magnetic vertical components |
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