Detection of Abandoned Coal Mine Goaf in China’s Ordos Basin Using the Transient Electromagnetic Method
Detection of Abandoned Coal Mine Goaf in China’s Ordos Basin Using the Transient Electromagnetic Method
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DOI：
10.1007/s10230-020-00724-4
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发表时间：
2020-09
影响因子：
2.8
通讯作者：
Peng Wang;Qing Wang;Yi Wang;Cheng Wang
中科院分区：
文献类型：
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作者：
Peng Wang;Qing Wang;Yi Wang;Cheng Wang
鄂尔多斯盆地是我国重要的煤田，早期的煤炭开采和管理方法留下了大量的未知采空区，制约了当今大型矿井的安全生产。瞬变电磁法是探测采空区的主要物探手段。针对鄂尔多斯盆地的地质条件，研究了最佳工作参数、电磁干扰和地形影响。一次场和二次场的数值模拟结果表明，对于鄂尔多斯盆地常见的100 m深采空区，使用至少240 m× 240 m的回线，可以获得最强的异常信号。时间补偿和多项式拟合算法可以用来分离和削弱TEM信号的电磁噪声。地形高差主要影响瞬变电磁法的深度参数，可以考虑沉积地层的横向连续性对深度参数进行修正，以校正地形的影响。三个成功的勘探实例表明，该研究成果在鄂尔多斯盆地具有较好的应用价值。
Early coal mining and management methods left a large number of unknown goafs in China’s important Ordos Basin, which has restricted the safe production in today’s large-scale mines. The transient electromagnetic (TEM) method is the main geophysical tool used to detect the goaf. We considered the geological conditions of Ordos Basin in studying the optimal working parameters, electromagnetic (EM) interference, and terrain influence. The numerical simulation results of primary and secondary fields show that the most powerful abnormal signal can be obtained for the common 100 m deep goaf of the Ordos Basin by using a loop at least 240 m× 240 m. Time compensation and a polynomial fitting algorithm can be used to separate and weaken the TEM signal’s EM noise. The terrain height difference mainly affects TEM’s depth parameters, which can be modified to correct the topographic influence by considering the lateral continuity of the sedimentary strata. Three successful detection cases show that the study’s results can be used effectively in the Ordos Basin.