| 三分量地-孔瞬变电磁法积水采空区探测试验 |
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| 引用本文： | 姚伟华,王鹏,李明星,苏超,程思远.三分量地-孔瞬变电磁法积水采空区探测试验[J].煤田地质与勘探,2019,47(5):54-62. |
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| 作者姓名： | 姚伟华 王鹏 李明星 苏超 程思远 |
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| 作者单位： | 中煤科工集团西安研究院有限公司 |
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| 基金项目： | 国家重点研发计划项目课题（2017YFC0804105）；国家自然科学基金项目（41807190）；中国煤炭科工集团有限公司科技创新创业资金专项项目（2018MS006） |
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| 摘 要： | 孔中物探方法是近几年行业研究的热点，考虑到金属矿上应用较成熟的地-孔瞬变电磁法具有径向探测距离远，数据信号不易受地面电磁干扰影响等特点，将其应用到煤矿积水采空区探查领域。采用三维时域有限差分算法对钻孔不同方位的积水采空区模型的总场响应、异常响应进行了数值模拟，总场三分量对积水采空区反映明显，异常场三分量形态组合能判别异常体的方位。采用等效涡流原理，研究了利用异常场三分量来反演异常体的位置、倾角和规模等参数的空间定位算法。通过不同方位的理论模型测试，不同时刻的反演等效电流环大小、位置的组合能反应含水采空区的空间位置及规模。最后在陕北某矿针对已知含水采空区开展地-孔瞬变电磁法探测试验，采集的三分量信号光滑可靠，且异常反应明显，并对不同时刻的异常场三分量数据进行反演处理，反演结果与实际采空区位置和规模基本一致，证明该方法可作为煤矿钻孔中探查积水采空区的有效手段。
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| 关 键 词： | 地-孔瞬变电磁法 三分量响应特征 积水采空区 三维时域有限差分算法 空间定位算法 |
| 收稿时间： | 2019-05-14 |
Experimental study of three-component down-hole TEM for detecting water-filled goaf |
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| Abstract: | The borehole geophysical prospecting method is a research hotspot in recent years. Considering that the down-hole transient electromagnetic method used in metal mines has the characteristics of long radial detection distance and less susceptible to surface electromagnetic interference, it is applied to the exploration of water-filled goaf in coal mines. Three-dimensional finite-difference time-domain(FDTD) algorithm is used to simulate the total field response and abnormal response of the goaf model with different orientations of boreholes. The total field three-component could reflect the water-filled goaf obviously, and the abnormal field three-component shape combination can distinguish the azimuth of the abnormal body. Based on the principle of equivalent eddy current, the spatial location algorithm is studied, which can obtain the position, inclination and scale of anomalous body by using three components of anomalous field. By testing the theoretical models in different directions, the combination of the size and location of the equivalent current loop inverted at different times can reflect the spatial position and scale of the water-filled goaf. Finally, the down-hole TEM detection test was carried out in a mine in northern Shaanxi Province. The location and size of the water-bearing goaf were known in this area. The collected three-component signals are smooth and reliable, and the abnormal response is obvious. The three-component data of anomalous field at different time are retrieved and processed. The inversion results are basically consistent with the actual location and scale of the goaf, which proves that this method can be used as an effective means to explore the water-filled goaf through boreholes in coal mines. |
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