China Coal Technology and Engineering Group Shenyang Research Institute
State Key Laboratory of Coal Mine Safety Technology
Liaoning Institute of Geological Exploration Co., Ltd.
Shenyang Geological Survey Center of China Geological Survey
College of Safety Science and Engineering

为指导煤田火区地球物理勘探技术，判断煤火发展的阶段，精准识别隐蔽火区边界，通过分析岩石的导电机理、狭义的煤岩体电性特征，有针对性地展开煤及煤围岩高温电性研究。通过实验测试煤岩体在不同温度下的电阻值，总结出煤岩石电阻率随温度的变化规律及其影响机制；以数值模拟方法为手段，建立煤田火区地电模型并开展瞬变电磁（TEM）正反演计算。结果表明：煤的电阻率随着温度升高而减小，在高温阶段煤的含碳量是影响其电阻率的主导因素；干燥煤围岩的电阻率随温度的升高而降低，热动力条件下自由移动的载流子数量是影响其电阻率的主导因素；高温煤比高温围岩引起的瞬变电磁异常响应幅值大得多，瞬变电磁中心回线装置对于高温火区的耦合效果最佳，火区埋深越浅电性异常效果越明显。

In order to guide the geophysical exploration technology of coal field fire area, judge the development stage of coal fire, accurately identify the boundary of hidden fire area, carry out targeted high-temperature electrical property research of coal and coal surrounding rock by analyzing the conductive mechanism of rock and the electrical property characteristics of coal rock mass in a narrow sense, by testing the resistance values of coal and rock mass at different temperatures, the change law of coal and rock resistivity with temperature and its influence mechanism are summarized; by means of numerical simulation method, the geoelectric model of the coal field fire area is established and the forward and reverse calculation of transient electromagnetic (TEM) is carried out. The results show that the resistivity of coal decreases with the increase of temperature, and the carbon content of coal is the dominant factor affecting its resistivity at high temperature stage; the resistivity of the surrounding rock of dry coal decreases with the increase of temperature, and the number of free moving carriers under the thermal dynamic condition is the dominant factor affecting its resistivity. Through numerical simulation, it is found that the transient electromagnetic abnormal response amplitude caused by high-temperature coal is much larger than that caused by high-temperature surrounding rock, the coupling effect of the transient electromagnetic central loop device on the high-temperature fire area is the best, and the shallower the burial depth of the fire area, the more obvious the electrical abnormal effects.

中煤科工集团沈阳研究院创新引导资助项目（SYYD-21TF-001,SYYD-21TF-002）；

1 煤岩石电性特征
1.1 岩矿石导电机制
1.2 高温煤岩体导电特征
2 高温煤岩体实验
2.1 研究现状
2.2 实验装置
2.3 实验分析
2.3.1 褐煤
2.3.2 岩石
2.4 高温煤岩体实验结果
3 地球物理数值模拟
3.1 数值模型及参数
3.2 数值模型结果
4 结论

GE Huan, HAN Meng, LIU Lei, et al. Study on electrical characteristics and geophysical numerical simulation of high temperature coal and rock mass[J]. Safety in Coal Mines, 2023, 54（11）: 92−98.