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摘要:
某煤矿采用V8多功能电法仪开展CSAMT探测试验，由于研究区内电磁干扰严重，得出的卡尼亚视电阻率质量较低。为了提高视电阻率数据的质量及其利用率，尝试采用广域电磁法进行CSAMT数据的处理，分别应用单分量电场法、比值法(电场和磁场相比)计算广域视电阻率。结果表明：由于V8施工时不采集场源发射电流，单分量电场法计算结果误差较大；比值法的计算结果在高频段与卡尼亚视电阻率一致，但在低频段优于卡尼亚视电阻率，与实际地电情况更吻合；比值法广域视电阻率的反演结果准确地揭示了矿区含煤地层和奥陶系灰岩的界面，地层解释结果与钻探结果一致，验证了广域电磁法在煤矿CSAMT数据处理中的可行性和有效性。研究成果为其他矿产资源的CSAMT数据处理提供参考。
Abstract:A CSAMT detection test was carried out for a coal mine with V8 multi-functional electrical instrument. Due to the serious electromagnetic interference within the area, the Cagniard apparent resistivity was low in quality. In order to improve the quality and utilization rate of data, authors attempted to process the CSAMT data collected by V8 with the wide field electromagnetic method, which used single-component method and ratio method (Electric field divided by magnetic field) to calculate apparent resistivity. The results showed that there was some deviation between the single-component wide field apparent resistivity and the actual terrestrial electricity because the emission current was not measured during the construction of V8. The wide field apparent resistivity of ratio method was agree with the Cagniard apparent resistivity in the high frequencies but significantly better in the low frequencies, and consistent with the actual terrestrial electricity. In addition, the inversion results of the ratio method wide field apparent resistivity accurately reflected the interface between the coal measure strata and the Ordovician limestone. The geological interpretation corresponded well with the drilling results, which verified the feasibility and effectiveness of wide field electromagnetic method in CSAMT data processing for coal mines.The research results also provide references for CSAMT data processing of other mineral resources.
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图 4 典型测点的磁场−频率曲线和电场−频率曲线
Fig. 4 Magnetic field-frequency curve and electric field-frequency curve of typical measuring points
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图 5 研究区测线的磁场拟断面和电场拟断面
Fig. 5 Proposed cross section of magnetic field and electric field of measuring lines in study area
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图 6 8线1600点3种方法计算的视电阻率
Fig. 6 Apparent resistivity of Line 8 and Point 1 600 calculated by three methods
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图 7 层状模型正演视电阻率对比
Fig. 7 Comparison of forward apparent resistivity of stratified model
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图 8 研究区测线的卡尼亚视电阻率拟断面和广域视电阻率拟断面
Fig. 8 Proposed cross sections of Cagniard apparent resistivity and wide field apparent resistivity of measuring lines in study area
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图 9 13线2080点校正前后的广域视电阻率曲线
Fig. 9 Wide-field apparent resistivity before and after correction of Line 13 and Point 2080
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图 11 研究区广域反演结果拟三维
Fig. 11 Pseudo-3D figure of wide field inversion results of study area
表 1 发送频率和理论电流
Table 1 Frequencies and currents of emission
频率/Hz 电流/A 频率/Hz 电流/A 7680 4.97 85.33333325 14.99 6400 5.83 64 15.00 5120 7.00 53.33333334 15.00 3840 8.63 42.66666662 15.00 3200 9.67 32 15.00 2560 10.89 26.66666667 15.00 1920 12.22 21.33333331 15.00 1600 12.90 16 15.00 1280 13.55 13.33333333 15.00 1024 14.03 10.66666666 15.00 853.3333 14.30 8 15.00 640 14.60 6.666666667 15.00 512 14.74 5.333333328 15.00 426.6666667 14.82 4 15.00 341.333333 14.88 3.333333334 15.00 256 14.93 2.666666664 15.00 213.3333334 14.95 2 15.00 170.6666665 14.97 1.666666667 15.00 128 14.98 1.333333332 15.00 106.6666667 14.99 1 15.00 
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