六种不同变质程度煤的电阻率研究  

Characteristics of resistivity and its anisotropy of six kinds of metamorphic coals

作　　者：柴斌 许小凯 张川[3] 于光明 CHAI Bin;XU XiaoKai;ZHANG Chuan;YU GuangMing(Liaoning Dongmei Geological Survey Team Limited,Shenyang 110101,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Institute of Geochemistry,CAS,National Key Lab of Oral Geochemistry,Guiyang 550081,China;Institute of Multi-Component Seismic Techniques,Beijing 100029,China)

机构地区：[1]辽宁省东煤地质物探测量队有限责任公司,沈阳110101 [2]河南理工大学能源科学与工程学院,焦作454003 [3]中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵阳550081 [4]北京多分量地震技术研究院,北京100029

出　　处：《地球物理学进展》2021年第3期1046-1051,共6页Progress in Geophysics

基　　金：国家自然科学基金(41425017,41904118);“构造与油气资源”教育部重点实验室开放基金(TPR-2019-05)联合资助。

摘　　要：煤岩电阻率是衡量煤岩电性特征最重要的参数之一,是进行煤田电法勘探的物性前提.研究煤岩电阻率,尤其是其各向异性特征具有重要的理论和实践意义.本文通过对8块6种不同变质程度的煤岩电阻率及其各向异性测量发现:煤岩三方向的电阻率均随频率增加下降,且两者呈极好的负指数关系,平均相关系数达0.95以上;煤岩电阻率呈现明显的各向异性,走向与垂向、倾向与垂向之间的电阻率差异显著大于走向与倾向之间的电阻率差异;从褐煤到瘦煤,随着变质程度加深,煤岩电阻率呈上升趋势,但到无烟煤阶段,电阻率急剧下降;煤岩电阻率受湿度影响强烈,饱和水与非饱和水情况下电阻率存在较大差异.Electrical resistivity is an important parameter to describe the electrical characteristic of coal. It’s also the physical premise of surface geophysical survey in coal field. It is of great theoretical and practical significance to study coal’s resistivity and especially its anisotropy. The resistivity and its anisotropy of six different metamorphic kinds of coals were discussed through laboratorial resistivity measurement in its strike, dip and vertical directions. After analyzing the test data, some results and conclusions could be deduced: Coal resistivities in strike, dip and vertical directions show obvious anisotropy;the resistivity difference between strike and vertical or dip and vertical is much greater than that between strike and dip;the resistivities in three directions all reduce when testing frequency increases, and there is a good negative relation of exponential function with the correlation coefficient up to 0.95;with the rise of coal metamorphism, coal resistivity increases slowly as a whole from lignite to lean coal, but anthracite coal resistivity drops sharply, which is of high metamorphic grade;coal resistivity is strongly influenced by humidity, there is a big difference of resistivity, when moisture content of coal changes.

关 键 词：煤 变质程度 电阻率 各向异性 频率 湿度 

分 类 号：P631[天文地球—地质矿产勘探]