郭颖星^1,,
朱涛¹,
郑军²
1. 中国地震局地球物理研究所, 北京 100081
2. 中国地质科学院, 北京 100037

基金项目: 国家自然科学基金项目（41804087），中国地震局地球物理研究所基本科研业务费专项（DQJB20X10），科技部国家重点研发计划（2017YFC1500205）共同资助


详细信息

作者简介: 郭颖星, 女, 副研究员, 主要从事地球动力学数值模拟及岩矿物电学性质研究.E-mail: guoyingxing2008@126.com

中图分类号: P315

收稿日期:2020-12-16
修回日期:2021-05-07
上线日期:2021-11-10

Numerical simulation of electrical conductivity on the graphite-quartz model and its geophysical application

GUO YingXing^1,,
ZHU Tao¹,
ZHENG Jun²
1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2. Chinese Academy of Geological Sciences, Beijing 100037, China


MSC: P315

--> Received Date: 16 December 2020
Revised Date: 07 May 2021
Available Online: 10 November 2021


摘要
摘要:地壳高导异常及各向异性成因是地学研究的热点之一，断裂带区域常呈现出高电导率特征，对于石墨富集的断裂带，石墨形态及分布对导电性的影响已经引起关注.本文利用有限元数值模拟方法，构建了石墨-石英三维模型，探讨了石墨含量、排列方式、孔隙度及温度对模型电导率的影响.结果表明，石墨连通前，温度的增加能使模型电导率显著增大，而在石墨连通后，石墨含量的增加、片状石墨沿导电方向的定向排列以及石墨直径与厚度比值的增大，均能导致模型电导率发生显著增加，孔隙度的增大则导致模型电导率减小.同时，这些参数的变化也会使模型电导率突变时的石墨含量阈值发生改变，当石墨排列方向改变时，这一阈值变化显著，对于石墨富集的一些断裂带区域，石墨定向排列可能是引起高导的一种成因.
关键词: 石墨-石英模型/
电导率/
数值模拟/
定向排列/
孔隙度

Abstract:The causes of high conductivity anomalies and anisotropy are one of the focused issues in geosciences. Fault zones often exhibit characteristics of high conductivity. With regard to some graphite-rich fault zones, the influence of graphite morphology and distribution on conductivity has attracted attention. In this work, mineral-mixed models of graphite and quartz were constructed, and the finite element numerical method was used to examine the effect of graphite content, arrangement, temperature and porosity on the conductivity of the assemblage models. Results show that when the graphite particles are isolated from each other, the electrical conductivity of the model increases significantly with the increasing temperature. As graphite particles are connected, the conductivity increases with growing graphite content; the arrangement is oriented in the conductive direction and the ratio of graphite diameter to thickness increases. However, the increase in porosity leads to a decrease in model conductivity. The graphite content threshold also changes with these parameters and varies obviously with changes in the direction of graphite arrangement. For some graphite-rich faults, the orientation of graphite may be a cause of high conductivity.
Key words:Graphite-quartz model/
Electrical conductivity/
Numerical simulation/
Orientation arrangement/
Porosity



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