瞬变电磁法在煤田水文地质调查中的应用

煤田开采过程中坑道涌水严重威胁着矿山财产和人身安全，煤田水文地质调查是煤田地质勘探工作中的一项重要地质任务，瞬变电磁测深是目前煤田水文地质调查的主要方法。大多煤田水文地质调查的任务是查明区内工业煤层围岩的赋水性、主要断层的含水及导水性等问题。一些煤田浅部电阻率相对较低，电磁法应用难度相应较大。煤田地表大多较为复杂，河流和地表建筑严重地影响中心回线装置瞬变电磁方法正常施工，采用内回线测量方法可以降低地表复杂环境影响。文中以山东某煤田上的应用实例，介绍内回线装置瞬变电磁法的对比试验结果，视电阻率与反演电阻率资料对比结果以及在煤田水文地质调查中的应用效果。

APPLICATION OF TRANSIENT ELECTROMAGNETIC METHOD IN HYDROGEOLOGICAL SURVEY IN COAL FIELD

It is a serious threat to mine wealth and personal safety that water gushes from gallery in coalfield exploitation process, so hydrogeological survey is important in coalfield geology exploration. At present, transient electromagnetic sounding is the main method of hydrogeological survey in coalfield. The purpose of most of the hydrogeological survey in coalfield is to prospect the water content of the industrial coal-bed adjacent rock and the water content and permeability of main fault and so on. For the relatively low resistivity in superficial part of some coalfields, there are some difficulties in the use of electromagnetic method. Because most of the land surface environment is relatively complex and the rivers and buildings seriously affect the construction work of the central loop transient electromagnetic sounding, we should adopt interior loop method to decrease the influence which was brought by complex surficial environment. Instancing a coalfield in Shandong, the article introduces the contrast testing results of the interior loop transient electromagnetic sounding, contrastive results of the apparent resistivity and inversion resistivity, and the its application effect in hydrogeologial survey.