矿井直流电透视底板探测及三维反演解释  

Detecting floor geological information bymine DC perspective and 3D inversion

作　　者：李毛飞 刘树才[1] 姜志海[1] 苏本玉[1] 陈爽爽 LI Maofei;LIU Shucai;JIANG Zhihai;SU Benyu;CHEN Shuangshuang(School of Resource and Geosciences,China University of Mining and Technology,Xuzhou 221116,China;Changjiang Geophysical Exploration(Wuhan)Co.,Ltd.,Wuhan 430000,China)

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]长江地球物理探测(武汉)有限公司,湖北武汉430000

出　　处：《煤炭学报》2022年第7期2708-2721,共14页Journal of China Coal Society

基　　金：国家自然科学基金面上资助项目(41974151);宁夏回族自治区重点研发计划资助项目(2020BFG03008)。

摘　　要：煤炭安全高效开采乃至智能开采对查明煤层围岩地质条件的精细程度要求越来越高,然而目前常用的矿井直流电透视法在探测范围、能力方面还没有完全了解,制约了该方法的应用效果。为实现矿井直流电透视技术的精细探测,通过数值模拟和实测数据研究,分析了不同形状、不同电性、不同空间位置的地质体在电透视电位差曲线、视电阻率曲线中的表现形态,并对模拟数据分别进行了全空间高阻煤层约束反演和半空间反演。数值模拟与实测数据反演结果表明:在进行矿井直流电透视探测时,异常体在工作面底板附近的电透视曲线表现出与异常体相反的电性,异常体与工作面底板之间达到一定距离时,电透视曲线才可表现出与异常体相同的电性;异常体在接收点附近时比在发射点附近时对电透视曲线影响大;矿井直流电透视三维反演结果可以准确解译底板空间地质体电性及水平分布信息;全空间约束反演结果与半空间反演结果一致,半空间反演程序或软件可用于高阻煤层屏蔽下的全空间电透视数据反演;受高阻煤层屏蔽影响,当电极布设于底板时,可忽略顶板低阻体对观测数据的影响。随着无线通讯以及并行数据采集系统的发展,矿井直流电法一次施工可以获取多种装置数据,结合三维反演,可更加精细解译采煤工作面附近岩层电性信息,为采煤突水灾害防治提供可靠探测手段。Safe and efficient coal mining and even intelligent mining require a more precise identification of the geological conditions of the surrounding rock of the coal seam,and the current commonly used mine Direct Current(DC)perspective method has not fully understood the detection range and ability,which restricts the application effect of this method.In order to realize the fine detection of mine DC perspective technology,the authors conducted in-depth research on it through numerical simulation and measured data.The display forms of the geological body with different shapes,different electrical properties,and different spatial positions in the DC perspective potential difference curves and apparent resistivity curves were analyzed,and the synthetic data were used to full-space high resistivity coal seam constrained inversion and half-space inversion.The 3D inversion results of synthetic data and measured data show that the DC electrical perspective curves of different anomalous bodies near the bottom of the working face have the opposite electrical properties of the anomalous bodies.When there is a certain distance between the abnormal body and the bottom of the working face,the electrical perspective curve can show the same electrical properties as the abnormal body.The anomalous body has a greater impact on the electro-perspective curve when it is near the receiving point than when it is near the power supply point.The 3D inversion results of the mine DC perspective can accurately interpret the electrical properties and horizontal distribution information of the geological body.The full space constraint inversion results are consistent with the half-space inversion results and the half-space inversion program or software can be used to invert the full-space electrical perspective data under the shielding of high-resistivity coal seams.Due to the shielding effect of a high resistance coal seam,when the electrodes are laid at the bottom of the working face,the influence of the low resistivity body located in the ro

关 键 词：矿井直流电透视 三维电阻率反演 电透视电位差曲线 视电阻率曲线 突水防治 

分 类 号：P631[天文地球—地质矿产勘探]