| TEM探测深部煤层上覆多电性层的OCCAM反演 |
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| 引用本文： | 侯彦威.TEM探测深部煤层上覆多电性层的OCCAM反演[J].煤田地质与勘探,2018,46(6):169-173. |
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| 作者姓名： | 侯彦威 |
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| 基金项目： | 国家自然科学基金项目（41374150）；国家重点研发计划项目（2017YFC0804105）；中煤科工集团西安研究院有限公司科技创新项目（2016XAYMS26） |
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| 摘 要： | 瞬变电磁法（TEM）以其对低阻体反映灵敏而被广泛用于煤矿水文地质勘探中，当煤层埋藏较深，上覆地层纵向上有多种电性层存在时，瞬变电磁法晚期经验公式计算结果已不能反映实际情况。通过深入研究OCCAM反演算法，认为选择使误差目标函数达到最小的正则化参数，在反演迭代步长过大时进行压缩迭代步长的控制方法，以及最光滑的模型约束，可以提高反演分辨率。在瞬变电磁数据处理中使用加入了上述参数、控制和约束的反演技术，经对理论模型数据进行反演，反演结果与模型的电性分布规律吻合，表明算法正确；在华北煤田深部采场的瞬变电磁法探测应用中，OCCAM反演分辨出了煤层上覆多种电性地层，效果较好。
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| 关 键 词： | 瞬变电磁法 深部煤层 多电性层 OCCAM反演 |
| 收稿时间： | 2017-12-11 |
OCCAM inversion for detecting overlying multiple electrical layers above deep coal seams by TEM |
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| Abstract: | The transient electromagnetic method is widely used in hydrogeological exploration of coal mine due to its sensitivity to low resistance, when the coal seam is buried deeply and there are various electrical layers on the upper strata, the calculation results of TEM do not reflect the actual geological conditions. We research into OCCAM inversion, that makes the error objective function achieve the minimum of the regularization parameter, the iteration step size control method of compression during the iteration step size is too large, and the smooth model can improve the resolution of inversion. The inversion techniques of regularization parameter selection, optimal step size and constraint model are used in transient electromagnetic data processing. The theoretical model data is inverted, and the inversion result is consistent with the electric distribution of the model, it shows that the algorithm is correct. The application of TEM in deep coalfields in North China showed that OCCAM inversion is able to distinguish the various electrical strata above coal beds, and the result is good. |
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