矿井瞬变电磁法全空间处理及三维解释方法研究  

Full space processing and 3-D interpretation technique of mine transient electromagnetic method

作　　者：姜国庆[1] 贾春梅[2] 牟义[3] 陈丁[4] 

机构地区：[1]江苏省地质调查研究院基础地质研究所,南京210018 [2]中国石油化工股份有限公司石油物探技术研究院,南京211103 [3]煤炭科学研究总院矿山安全技术研究分院,北京100013 [4]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《地球物理学进展》2015年第5期2164-2170,共7页Progress in Geophysics

基　　金：国家自然科学基金重点项目(51034003)资助

摘　　要：矿井瞬变电磁法得到了广泛应用,但其数据处理解释方法研究相对滞后,为提高勘探精度本文对全空间处理及三维解释方法进行研究.以均匀全空间磁偶极源瞬变响应为基础,探讨全空间磁感应强度垂向分量Bz及其时间变化率Bz/T的核函数曲线特征,并给出全区视电阻率数值计算方法.研究结果表明Bz的核函数Y(Z)存在一个转折点Z=1,以转折点为界可以划分为两个单调区间;Bz/T的核函数Y′(Z)存在两个转折点Z=0.707和Z=1.732,以转折点为界可以划分为三个单调区间,在单调区间内通过二分搜索算法可以计算区间内视电阻率值,各区间视电阻率曲线通过转折点可构成全区视电阻率曲线.采用Voxler软件平台实现矿井瞬变电磁三维立体解释,并给出数据三维可视化的具体步骤.应用实例表明本文提出的全空间处理及三维解释方法可以实现工作面内煤层及其附近岩层三维电阻率成像,直观展现富水异常体三维空间展布特征,方法实用性强、探测效果较好.The mine transient electromagnetic technology has been widely applied, however,the data processing and interpretation method was relatively hysteretic.This paper studied the whole space processing and 3-D interpretation method to improve the exploration precision. The kernel function curve feature of full space magnetic induction intensity Bzand its time rateBz/T was discussed,which was based on transient response of magnetic dipole source in homogeneous full space. The computing method of all-time apparent resistivity was given in this paper.Research results shows that the kernel function Y（Z）has one turning point at Z=1which divided the function into two monotone spaces,the kernel function Y′（Z）has two turning points at Z=0.707 and Z=1.732 which divided the function into three monotone spaces.The binary search algorithm was used to calculate the apparent resistivity in each monotone space,therefore the all-time apparent resistivity curve can be built by integrated all the monotone space apparent resistivity through the turning points.Three-dimensional interpretation of mine transient electromagnetic method was realized by employing the software Voxler,specific steps of three-dimensional visualization were shown.The real data application results show that full space processing and three-dimensional interpretation technique proposed in this paper realize three-dimensional resistivity imaging of working face and adjacent rock,intuitively reveal the three-dimensional distributional characteristic of aquiferous abnormal body.This technique shows better practicability and better precision.

关 键 词：全空间瞬变电磁法 磁偶极源 全区视电阻率 二分搜索算法 三维成像 

分 类 号：P631.3[天文地球—地质矿产勘探]