| 于景邨.磁源边长大小对电磁场扩散速度影响规律研究[J].地质与勘探,2009,45(4):423-426 |
| 磁源边长大小对电磁场扩散速度影响规律研究 |
| A Study on Diffusion Speed of Electromagnetic Field with Different Size of Magnetic Source |
| 投稿时间：2008-11-04 修订日期：2009-06-01 |
| DOI： |
| 中文关键词: 全空间 瞬变电磁场 扩散速度 磁源 边长 |
| 英文关键词: whole-space, transient electromagnetic field, diffusion speed, magnetic source, loop size |
| 基金项目:国家重点基础研究发展计划(973 计划)项目(编号:2007CB209400)资助。 |
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| 摘要点击次数: 1978 |
| 全文下载次数: 1142 |
| 中文摘要: |
| [摘要]全空间电磁场扩散速度计算的准确性,直接影响矿井瞬变电磁法探测结果的精度。基于
电磁场全空间“双烟圈效应冶理论,建立了全空间电磁场扩散速度数学模型。对不同边长磁源回线中心
电磁场扩散速度进行了对比分析,并对巷道底板三层地电模型全空间理论视电阻率曲线进行了时深转
换,结果表明回线边长大,较早时间段回线中心扩散速度大,但衰减速度快,影响浅部地层探测能力;较
晚时间段,不同边长磁源回线中心扩散速度趋于相等,说明边长大小对深部地层探测能力影响小。提出
了较早时间段电磁场扩散速度校正系数,改进了磁源回线电磁场扩散速度数学模型,为实际探测工作中
磁源回线边长大小的选择提供理论依据。 |
| 英文摘要: |
| Abstract:The calculation accuracy of diffusion speed in whole-space electromagnetic field affects directly the interpretative precision of TEM survey
in underground coal mines. Based on the "double smoking rings theory" in whole-space electromagnetic field, we established a mathematic model of dif鄄
fusion speed of electromagnetic field in whole-space. Diffusion speed of electromagnetic field was analyzed and compared with varying side length of mag鄄
netic source loop in whole-space. Converted time-depth of curve of apparent resistivity with 3 seams theory model in laneway floor, the results demon鄄
strate that the diffusion speed of loop center is fast,but decay fast in the early period with long length loop, it爷s weak to survey the shallow layer; in the
late period, the diffusion speed with different side length of magnetic source loop tend to be equal, which shows the side length affects depth survey weak鄄
ly. The correction coefficient of diffusion speed with electromagnetic field in the early period was calculated and, the mathematic model of electromagnetic
field diffusion speed was ameliorated It might provid theory foundation for choosing magnetic source loop size in practical survey. |
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