高密度电阻率法2D和3D反演在盘州煤矿灾害区探测效果对比

Comparison of Detection Effect Between 2D and 3D Inversion ofHigh-density Resistivity Method in Panzhou Coal Mine Disaster Area

为测试高密度电阻率法2D反演与3D反演在盘州煤矿灾害区的探测效果,从数值模拟和工程应用实例两个方面,通过对剖面数据分别进行2D和3D反演,对比反演结果发现:数值模型结果显示3D反演结果无论是异常体形态及电阻率值都较2D反演结果更接近于模型真实值;在盘州煤矿区小关村内开展高密度电阻率法测量工作,共布设6条南北走向剖面,2条东西走向剖面,通过对比反演结果发现,2D反演结果的高阻异常范围远远大于3D反演结果的高阻异常范围,结合工程钻孔结果,2D反演结果的部分高阻异常区为假异常,推测由旁侧效应所致,3D反演结果的高阻异常范围更接近于钻孔资料。通过数值模拟及工程实例结果认为3D反演能够有效地消除2D反演中的假异常,更精准地反映煤矿活动区的采空及致灾范围。

In order to test the detection effect of 2D inversion and 3D inversion of high-density resistivity method in the disaster area of Panzhou coal mine,the author conducted 2D and 3D inversions of profile data respectively from two aspects of numerical simulation and engineering application examples.It turns cout that the 3D inversion results are closer to the real values of the model than the 2D inversion results,both in terms of abnormal body shape and resistivity.Coal mining area in plate state small village targeted for the high density resistivity measurements was deployed six north-south sections and two east-west sections.The inversion comparison results indicate that the 2D inversion results of abnormal high resistance range are more than 3D inversion results abnormal high resistance range,the 2D inversion results of some high resistance abnormal area are false anomalies.It is speculated that the high resistivity anomaly range of 3D inversion results is closer to the borehole data due to side effect.Based on the results of numerical simulation and engineering examples,the author believes that 3D inversion can effectively eliminate the false anomalies in 2D inversion,and more accurately reflect the mined-out and disaster scope of coal mine active areas.