瞬变电磁法在石泉煤矿逆断层富水性探测中的应用研究

Study on applicability of transient electromagnetic method in faultdetection of Shiquan Coal Mine

为了解石泉煤矿断层位置及导水性在瞬变电磁法中的响应特征,对钻孔资料进行数字化处理,获取不同层位的电阻率信息。依据钻孔信息建立模型进行反演,随后在已知钻孔周围探测,利用测点信息进行对比,结合模型和实测信息选择探测参数进行有效探测。研究结果表明,瞬变电磁有效探查出301盘区的DF_6断层位置。DF_6断层错断3号煤、15号煤,并且3号煤层上方砂岩具有含水性;研究显示断层电性响应特征为“两边相同,中间不同于两边”,DF_6逆断层北部不具备导水性,DF_6逆断层南部受DF_4正断层影响存在富水区域;一般情况逆断层不含水,但局部受正断层连接影响时,局部区域也会存在相对含水特征。瞬变电磁适用性研究为保障采煤工作面安全采掘及工作面布置优化设计提供了有利依据,也对周边相同地质情况探查提供了参考意义。

To understand the response characteristics of fault location and water conductivity in transient electromagnetic method in Shiquan Coal Mine,the borehole data was digitized to obtain resistivity information of different layers.Then,the model is established based on the borehole information for inversion,and then the borehole is detected around the borehole,and the information of the survey points is used for comparison to adjust the applicability of the detection parameter acquisition method.Establish a model based on drilling information for inversion,then detect around known drilling holes,compare with measurement point information,and select detection parameters based on model and actual measurement information for effective detection.The results of this study show that the transient electromagnetic effectively detected the existence of DF 6 fault in Panel 301,and the fault dislocated the No.3 and No.15 coal seams,and the sandstone above the No.3 coal seam has water-bearing property.The research shows that the electrical response characteristics of the fault are"both sides are the same,and the middle is different from both sides".The north of the DF 6 thrust fault does not have water conductivity,and the south of the DF 6 thrust fault is affected by the DF 4 normal fault and has a water rich area.Generally,the thrust fault does not contain water,but when it is partially affected by the connection of normal faults,there will also be relative water bearing characteristics in local areas.The study of transient electromagnetic applicability provides a favorable basis for ensuring safe mining and optimizing the layout design of the working face,and has reference significance for the exploration of the same geological conditions.