Application Effect of TEM Based on High Temperature Superconducting Sensor in Qingchengzi Ore-Concentrated Area
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摘要: 为了提高瞬变电磁法的探测深度，在青城子矿集区开展了大定源装置条件下基于线圈传感器和高温超导传感器的瞬变电磁法实验工作.结果表明：利用高温超导传感器直接测量磁场具有低噪声、高灵敏度、低频响应好的特点，晚期信噪比高且对深部低阻响应敏感的优点.在相同激发条件和低噪声背景条件下，基于高温超导传感器的瞬变电磁法在青城子矿集区探测深度可达到1 800 m左右，较传统线圈传感器反演深度提高50%，该方法能有效地提高瞬变电磁法探测深度.Abstract: In order to improve the detection depth of TEM, the TEM experiment based on HTS sensor was carried out in Qingchengzi ore-concentrated area. The results show that the HTS sensor has the advantages of low noise, high sensitivity and good response at low frequency. Under the same excitation condition and low noise background, the detection depth of TEM based on HTS sensor in Qingchengzi ore-concentrated area can reach about 1 800 m, which is 50% higher than that of conventional coil sensor, indicating this method can effectively improve the detection depth of TEM.
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图 1 青城子矿集区地质简图
据辽宁省地质矿产调查院，2001. 1∶5万区域地质调查报告（青城子镇幅）修改
Fig. 1. Sketch geological map of Qingchengzi ore-concentrated area
图 2 同点感应电动势衰减曲线（a）和高温超导磁场衰减曲线（b）
Fig. 2. Decay curves of coil (a) and HTc SQUID (b) for same station
图 3 Loop4感应电动势剖面曲线（a）和磁场剖面曲线（b）
Fig. 3. Profile for inductive EMF (a) and profile for BZ (b)
图 4 Loop4感应电动势（a）和磁场（b）电阻率反演断面图
Fig. 4. Resistivity inversion sections for induced voltage (a) and BZ (b) for Loop4
图 5 L15线感应电动势剖面曲线（a）和磁场剖面曲线（b）
Fig. 5. Inductive EMF profile (a) and BZ profile (b) for L15
图 6 L15线感应电动势（a）和磁场（b）电阻率反演断面图
Fig. 6. Resistivity inversion sections of induced voltage (a) and B (b) for L15
图 7 小佟家堡子瞬变电磁X1线电阻率反演断面图
Fig. 7. TEM resistivity inversion section for X1 line in Xiaotongjiapuzi
表 1 青城子矿集区岩(矿)石电性参数统计
Table 1. Statistic of electrical parameters for rock (ore) in Qingchengzi ore-concentrated area
岩性 样本数 电阻率(Ω·m) 最小值 最大值 平均值 白云大理岩 43 3 630.7 26 196.7 11 466.9 变粒岩 34 308.6 20 827.7 5 163.5 矽线石云母片岩 21 5 392.1 13 786.1 4 635.5 黄铁矿化大理岩 30 367 1 816 669 黑云母片岩 30 4 003 8 091 5 974 斑状花岗岩 26 728.2 13 654.8 7 020.8 黑云变粒岩 9 2 008.8 8 095.5 5 428.6 含石墨大理岩 30 87 314 227 透辉透闪片岩 30 286 1 693 702 
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