| 大定源瞬变电磁法激励场及边框效应研究 |
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| 引用本文： | 包乃利,刘鸿福,余传涛.大定源瞬变电磁法激励场及边框效应研究[J].煤田地质与勘探,2014,42(2):80. |
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| 作者姓名： | 包乃利 刘鸿福 余传涛 |
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| 作者单位： | 河南省地质矿产开发局第四地质矿产调查院;太原理工大学矿业工程学院; |
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| 基金项目： | 国家高技术研究发展计划(863计划)项目(2011AA050102) |
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| 摘 要： | 通过对大定源瞬变电磁激励一次场理论解析计算，分析了不同偏移距、不同规格线框一次场的分布及衰减规律。结果表明:近中心一定偏移距、一定深度范围内一次场大于中心点处一次场，且偏移距越大一次场越强，衰减也越快；超过这个深度一次场比中心处一次场小。当偏移距大到一定程度时，一次场的衰减与近中心处的衰减不同，此时边框效应严重，对浅层信号和长宽比大的矩形框影响较大。对与目标体共深度一次场相差在5%以内的区域的研究，解决了有效勘探范围的量化确定问题。
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| 关 键 词： | 瞬变电磁法 大定源回线 边框效应 激励场 |
| 收稿时间： | 2012-11-10 |
The research on the primary field and rim effect of transient electromagnetic method with large fixed loop |
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| Abstract: | Through the calculation of the primary field of transient electromagnetic method with the large fixed loop, the distribution and delay features of the primary field of different offset and different loop size were analyzed. The results of the research demonstrate that the early primary field was greater than that in the center within certain depth range, the more the offset within certain range is, the more the primary field and the more depth rate from ground to this depth are. Over this depth, the primary field of the center is the largest, when the offset is increased to some extent, the delay features of the different offset are different; rim effect has great influence on signals of shallow layer and the big length-width ratio rectangular loop. Finally, the study in the area where the target has the same depth and the error of primary field is no more than 5% solved the problem of how to delineate effective exploration area. |
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