【作者】 于生宝； 沈铱涵； 张嘉霖； 张兆麟； 孟范泽；

【Author】 YU Shengbao;Shen Yihan;Zhang Jialin;Zhang Zhaolin;Meng Fanze;The college of Instrumentation and Electrical Engineering,Jilin University;

【机构】 吉林大学仪器科学与电气工程学院；

【摘要】 不同物态下,水的电性参数有很大差异,极地地质勘探研究多是通过电阻率差异对冰雪水等介质进行区分,为了实现通过介电性差异分辨冰雪水介质的可能性,本文基于瞬变电磁法理论,引入Cole-Cole模型。Cole-Cole模型多用于模拟岩矿石介质的极化效应,为了验证其在反演冰和水等介质的瞬变电磁响应中的适用性,本文采用遗传算法提取Cole-Cole模型的参数,进行建模仿真,推导中心回线一维层状介质瞬变电磁响应的表达式,分析不同Cole-Cole模型谱参数对瞬变电磁响应的影响。通过反演提取出冰层厚度和极化率与实际值进行对比,冰层厚度的反演误差可达到0.74%,验证了可以利用Cole-Cole模型通过介电性差异区分冰和水等介质。本文的研究和分析结果有利于加深极化效应对瞬变电磁响应影响特征的了解,并为极地勘探方法提出新的可能性,为不同物理状态下的水的分辨方法提供新思路。更多还原

【Abstract】 In order to realize the possibility of distinguishing ice,snow and water media through the difference of dielectric properties,this paper introduces the Cole-Cole model based on the theory of transient electromagnetic method.The Cole-Cole model is mostly used to simulate the polarization effect of rock and ore media.In order to verify its applicability in the inversion of the transient electromagnetic response of ice and water media,this paper uses genetic algorithms to extract the parameters of the Cole-Cole model,conducts modeling simulations,derives the expressions of the transient electromagnetic response of one-dimensional laminar media with central return,and analyzes the effect of different Cole-Cole model spectral parameters on the transient electromagnetic response.The effect on the transient electromagnetic response is analyzed.The ice thickness and polarization rate are extracted by inversion and compared with the actual values to verify that the Cole-Cole model can be used to distinguish between ice and water and other media by the difference in dielectric properties.The results of the research and analysis in this paper are helpful to deepen the understanding of the characteristics of polarization effects on the transient electromagnetic response,and suggest new possibilities for polar exploration methods and provide new ideas for the methods of distinguishing water in different physical states.更多还原