垂直电性源瞬变电磁监测在典型地质构造中的应用  

Application of Transient Electromagnetic Monitoring of Vertical Electrical Source in Typical Geological Structures

作　　者：张明君[1] ZHANG Mingjun(The Sixth Geological Brigade of the Bureau of Geology and Mineral Resources Exploration and Development of Xinjiang Uygur Autonomous Region,Hami 839000,China)

机构地区：[1]新疆维吾尔自治区地质矿产勘查开发局第六地质大队,新疆哈密839000

出　　处：《煤炭技术》2024年第3期109-114,共6页Coal Technology

摘　　要：矿井地层中存在的地质构造易引起地质灾害的发生,对矿井安全生产造成极大威胁。为提高瞬变电磁法探测精度与探测范围,以电磁场扩散理论为基础,运用正演模拟方法,分析了垂直电性源瞬变电磁场的响应曲线衰减规律,设计了矿井地质构造致灾区垂直电性源在线监测系统,并模拟了垂直电性源TEM对典型断层地质构造的识别能力。结果表明:当发射源长度为1 000 m时,可监测的偏移距离在500~4 500 m,监测深度可达2 000 m,可以满足地质构造的探测需求。感应电动势与电场的六分量在平面图中均可对断层地质构造进行有效识别,其中z方向分量的识别效果最好。在衰减曲线图中,dBx/t与dBy/t对于断层的识别能力较弱,而其余的四个分量均可对断层构造进行有效识别。The geological structure existing in the mine stratum is easy to cause geological disasters,which poses a great threat to the mine safety production.In order to improve the detection accuracy and range of transient electromagnetic method,based on the electromagnetic field diffusion theory and forward modeling method,the attenuation law of the response curve of the transient electromagnetic field of vertical electrical source is analyzed,and the vertical electrical source online monitoring system is designed in the disaster area caused by mine geological structure,and the identification ability of vertical electrical source TEM to typical fault geological structure is simulated.The results show that when the length of the emission source is 1000 m,the deviation distance can be monitored from 500 to 4500 m,and the monitoring depth can reach 2000 m,which can meet the requirements of geological structure detection.The six components of induced electromotive force and electric field can be used to identify the fault geological structure effectively,and the z-direction component is the best.In the attenuation curve,dBx/t and dBylt have weak ability to identify faults,while the other four components can effectively identify fault structures.

关 键 词：瞬变电磁法 地质构造 物探技术 

分 类 号：P631.3[天文地球—地质矿产勘探]