综合物探方法在章丘多层煤矿采空区探测中的应用

An Applied Study of Comprehensive Geophysical Methods in Exploration of Multilayer Goaf in Coal Mines in Zhangqiu

为充分发挥综合物探技术在地下采空区的探测优势,探测地下煤矿采空区的分布特征,更好地服务于城市建设及生态环境保护,选择合适的物探方法至关重要.山东章丘煤矿采空区分布复杂,断裂构造发育,且存在多层煤开采的情况,从分析已有煤矿资料入手,总结煤层分布特征及采空区分布形态,选取高密度电阻率法和EH-4电导率成像法这2种方法对该矿采空区进行勘探,发挥浅层探测优势,选取适当参数,提高探测精度,明确精细化解释原则,推断出勘查区3煤、4煤、7煤、9煤和10煤采空区的分布范围及埋藏深度,并推测主要断裂构造的分布位置.针对物探推断解释的成果,后期进行钻探及井下电视,验证这2种方法组合勘探的效果良好,基本实现对深度30~400 m采空区异常的探测.将高密度电阻率法与EH-4电导率成像法同时运用于煤矿采空区勘查,可为同类场地条件下探测地下煤层采空区提供借鉴.

In order to take full advantage of geophysical prospecting in the detection of goaf in coal mines,accurately detect the distribution of goaf in coal mines,and better serve the urban construction and ecological environment protection,it is very important to choose appropriate geophysical exploration method.Zhangqiu Coal Mine in Shandong Province has complex goaf distribution,developed fault structure and multi-layer coal mining.This paper starts with the analysis of geological data,summarizes the distribution characteristics of coal seam and form of goaf.High-density electrical method and EH-4 conductivity imaging methodare selected.It gives full play to the advantages in shallow detection,selects appropriate parameters,improves the detection accuracy,and clarifies the principle of interpretation,deduces the distribution range and burial depth of 3 coal,4 coal,7 coal,9 coal and 10 coal goafs,and speculates the distribution locations of the main fault structures.The validity of the method combination are proved by the date of late drilling and downhole TV,and the detection of 30~400 m s goaf abnormal has been basically realized.The high-density electrical method and EH-4 have complementary advantages,which provides a guidance for detecting other goafs in similar conditions.