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| Comparison of application effects of WFEM and CSAMT in water-rich area of Xinyuan Coal Mine |
LI Di-Quan1,2,3( ), XIAO Jiao-Yu1,2,3, ZHANG Ji-Feng4, HU Yan-Fang1,2,3, LIU Zui-Liang5, ZHANG Xin5 |
1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Central South University, Changsha 410083, China
2. Hunan Provincial Key Laboratory of Non-ferrous Resources and Geological Hazard Detection, Changsha 410083, China
3. School of Geosciences and Info-physics, Central South University, Changsha 410083, China
4. School of Earth Science and Resources, Chang'an University, Xi'an 710000, China
5. Geological Survey Department of Yangquan Coal Industry Group, Yangquan 045000, China |
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Abstract To detect the water-rich areas in coal seams, the wide-field electromagnetic method (WFEM) was employed in the Xinyuan mining area of Huayang New Material Technology Group Co., Ltd. for the first time. Meanwhile, the controlled source audio-frequency magnetotellurics (CSAMT) was used for comparison. According to the comparison results of the apparent resistivity curves, frequency-apparent resistivity pseudo sections, and inversion results, WFEM enjoys the advantages of large detection depth, high efficiency, and high precision and thus serves as a new effective technology for the detection of water-rich areas in coal mines.
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Received: 21 December 2020
Published: 15 December 2021
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Relationship between known aquifer and main coal seam in Xinyuan minefield
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| 地层 | 主要岩性 | 电阻率范围(平均值)/(Ω·m) | 电性特征 | | 上石盒子组(P2s) | 砂岩、硅质岩、泥岩 | >82.4(150.2) | 高阻 | | 下石盒子组(P1x) | 泥岩、细粒长石石英砂岩 | 20~30(25.1) | 低阻 | | 山西组(P1s) | 砂岩 | 60~72(66.5) | 高阻 | | 泥岩 | 15~20(19.8) | 低阻 | | 煤层 | 320~340(335.7) | 高阻 | | 太原组(C2t) | 砂质泥岩 | 15~30(20) | 高阻 | | 石灰岩 | >370(420.3) | | | 煤层 | >300(380.6) | | | 砂岩、泥岩 | 150~160(155.8) | | | 本溪组(C2b) | 粉砂岩、铝质泥岩 | 60~75(71.6) | 低阻 | | 峰峰组(O2f) | 泥质灰岩、层状石灰岩 | <100(63.4) | 低阻 | | 上马家沟组(O2s) | 石灰岩、白云质灰岩 | >960(1200) | 高阻 |
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Statistics of physical parameters of stratum and surrounding rock
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Survey line layout
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Schematic diagram of WFEM's observation device
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Comparison of apparent resistance curve between CSAMT and WFEM at point 235 and 237
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Comparison of apparent resistance curve between CSAMT and WFEM at point 381 and 383
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Comparison of apparent resistivity of original data of WFEM and CSAMT
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285 line inversion results and water outlet verification
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Comparison of inversion results of WFEM (a) and CSAMT (b) of line 280
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