摘要
构造煤结构复杂且不同类型构造煤显现出不同特征,为研究构造煤复电阻特征,采取同一矿区不同类型构造煤(碎裂煤、碎粒煤、碎粉煤、碎斑煤、鳞片煤、糜棱煤)以及原生结构煤,在不破坏其结构的情况下,常温常压状态下使用IM3533-01型LCR阻抗测量仪设备测量0.1~105 Hz内煤样的复电阻,在频率域内基于Cole-Ccole模型将反演参数与构造煤结构建立联系,主要研究单个样品各向异性对比与不同类型样品之间特征对比。研究表明:无论原生结构煤还是构造煤都发生由激发极化引起的强烈频散现象以及由结构引起的复电阻差异;并且在复电阻各向异性对比中发现原生结构煤、碎裂煤具有各向异性,其余各向异性不明显,但也有构造煤样品存在单方向优势裂隙从而导致各向异性特征显现。在不同类型样品间对照试验发现,原生结构煤和构造煤各类型在复电阻虚部与实部以及零频电阻Z(0)、时间常数τ值表现出明显差异,原生结构煤Z(0)几乎为构造煤平均值的1400倍,原生结构煤τ几乎为构造煤平均值的320倍;在构造煤序列中Z(0)与τ表现为(糜棱煤>碎斑煤>碎裂煤>碎粒煤>碎粉煤>鳞片煤),其中鳞片煤电阻极低;分析得出是由于层理性、致密程度、裂隙、煤结构演化、粒度大小等因素共同作用的结果,影响因素的权重在特定情况下不同,并提出煤结构复电阻导电性以及频散模型解释这一现象的机理。从而为煤层气勘探和瓦斯突出预测与评价这类学科领域亟待解决的关键科学问题及技术提供借鉴。
Tectonic coals have complex structures and different types of tectonic coals show different characteristics.In order to study the complex resistivity characteristics of tectonic coals,different types of tectonic coals(cataclastic coal,granulated coal,porphyroclastic coal,pulverized coal,squamate coal and mylonitic coal)and the coal with primary structure were selected from same mining area.Without destroying their structures,at room temperature and pressure,the complex resistivity of coal samples in the frequency range of 0.1 Hz to 100 KHz was measured using the IM3533-01 LCR impedance measuring device.Based on the Cole-cole model in this domain,the inversion parameters are related to the coal structure.The main research is the anisotropy comparison of a single sample and the feature comparison between different types of samples.The studies demonstrate that both the primary structural coal and the structural coal have a strong dispersion phenomenon caused by induced polarization and a complex resistivity difference caused by the structure.A comparison of the complex resistivity anisotropy found that the primary structural coal and cataclastic coal have anisotropy,and the anisotropy in other coals is not obvious,but there are also unidirectional dominant fractures in the tectonic coal samples,which cause the anisotropic features to appear.The controlled experiments between different types of samples found that the types of primary structural coal and structural coal show some significant differences in the imaginary and real parts of the complex resistivity,the zero-frequency resistance Z(0),and the time constantτvalue.The Z(0)of primary structural coal is almost 1400 times of the average value of tectonic coal.Theτof primary structural coal is almost 320 times of the average value of tectonic coal.In the tectonic coal sequence,Z(0)andτappear as(mylonitic coal>porphyroclastic coal>cataclastic coal>granulated coal>pulverized coal>squamate coal),the resistivity of squamate coal is extremely low.The analysis results demonstrate that these are due to the combined effect of layer rationality,compactness,cracks,coal structure evolution,particle size and other factors.The weight of influencing factors is different in specific circumstances,and it is proposed that structural complex resistivity conductivity and dispersion model explain the mechanism of this phenomenon.This study will provide some theoretical and experimental foundations for key scientific and technological issues that need to be resolved in such subject areas as coalbed methane exploration and gas outburst prediction and evaluation.
作者
张也
李东会
张玉贵
ZHANG Ye;LI Donghui;ZHANG Yugui(School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic University,Jiaozuo 454000,China;Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region,Jiaozuo 454000,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2020年第S02期943-954,共12页
Journal of China Coal Society
基金
河南省科技攻关资助项目(182102310780)
河南省自然科学基金资助项目(182300410138)
河南联合国家自然基金资助项目(U1704129)
关键词
构造煤
复电阻
频散特征
Cole-Ccole模型
电法勘探
tectonic coal
complex resistivity
dispersion characteristics
Cole-Cole model
electrical exploration
作者简介
张也(1995—),男,山西晋中人,硕士研究生。E-mail:885653543@qq.com;通讯作者:李东会(1981—),男,河南辉县人,讲师,博士。E-mail:lidonghui@hpu.edu.cn
