煤复电阻率频散机理研究  

Frequency dispersion mechanism of complex resistivity of coal

作　　者：郭跃辉 张玉贵[1,2] 李健 周猛 GUO Yuehui;ZHANG Yugui;LI Jian;ZHOU Meng(College of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Collaborative Innovation Center of Central Plains Economic Region for Coalbed/Shale Gas,Jiaozuo 454000,China)

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454000 [2]中原经济区煤层(页岩)气河南省协同创新中心,河南焦作454000

出　　处：《煤田地质与勘探》2020年第1期221-226,共6页Coal Geology & Exploration

基　　金：国家科技重大专项任务(2016ZX00504-007-007);河南省高校科技创新团队支持计划项目(141RSTHN002);河南省科技攻关重点项目(19210231019,182102310780)。

摘　　要：为了研究在0~200 kHz条件下煤复电阻率频散的物理机理,在恒定电流变频条件下,测量煤的复电阻率幅频相频。利用傅里叶逆变换,将煤的复电阻率频域数据变换成时域数据;利用Cole-Cole模型,将复电阻率频散数据进行拟合;借鉴双电层形变假说理论,对比砂岩频散现象,研究煤的复电阻率频散机理。结果表明:在电流频率为0~200k Hz,焦作赵固矿和九里山矿样品复电阻率频散特征与岩石相似,复电阻率幅值随频率增大而减小,复电阻率相位的绝对值随频率的增大先增大后减小,引起频散特征的原因主要是激发极化,电磁感应的影响程度很小。煤复电阻率测量和频散机理的研究成果为复电阻率测井提供了理论依据,具有一定的应用前景。In order to study the physical mechanism of frequency dispersion of complex resistivity of coal at 0–200 kHz,the amplitude-frequency and phase-frequency of complex resistivity of coal are measured under variable frequency of constant current.Using the Fourier inverse transform to convert the frequency domain data of complex resistivity of coal into time domain data;Using the Cole-Cole model,the complex resistivity dispersion data are fitted;Drawing on the electric double layer deformation hypothesis theory,the dispersion mechanism of complex resistivity of coal is studied by comparing the frequency dispersion of sandstone.The results show that in the current frequency range of 0-200 kHz,the measured dispersion characteristics of the complex resistivity of coal mainly reflect the induced polarization effect of coal and are interfered by electromagnetic induction.The complex resistivity of coal has dispersion characteristics,and the cause of dispersion is mainly caused by induced polarization,and the degree of influence of electromagnetic induction is small.It is theoretically feasible to develop a new method for coalfield exploration and logging based on the complex resistivity dispersion characteristics of coal.

关 键 词：复电阻率测井 频散特性 激发极化 傅里叶变换 COLE-COLE模型 

分 类 号：TD12[矿业工程—矿山地质测量]