陕北典型黄土断面电性特征及其地电模型  

Electrical characteristics of typical loess sections in northern Shaanxi and the relevant geoelectric model

作　　者：张松[1,2] 刘展[2] 徐凯军[2] 李铁明[3] 陈晓红 闫相相 朱炅君 

机构地区：[1]中国地震局第二监测中心,陕西西安710054 [2]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [3]中国地震局地质研究所,北京100029

出　　处：《物探与化探》2017年第2期224-230,共7页Geophysical and Geochemical Exploration

基　　金：中石油重大科技项目子课题(RIPED-2014-JS-281);国家青年自然基金项目(41304094);国家自然科学基金项目(41374026;41274083)

摘　　要：利用从陕北延长、洛川、宝鸡地区7处典型黄土断面实地采集的239个测点的介电常数、电阻率数据,归纳总结了黄土的介电特性和电阻率特性,发现黄土层和红土层表现出明显的电性分层。简要探讨了陕北黄土电参数之间的关系及影响因素,重点以数据采集最为详实的延长地区"长10井"黄土断面为例,对长10井黄土断面进行了精细的电特性刻画和描述。主要针对用探地雷达等电磁方法在黄土塬区分辨出红土层的理论可行性、研究过程是否需要消除含水率对电参数的影响、建立科学典型的黄土地电模型这3个问题进行了初期探索,为探地雷达等电磁勘探手段在黄土塬区提取有效激发层(红土层)的研究提供了黄土电特性理论基础、断面解释依据和黄土地电模型。Using the permittivity and resistivity data of 239 measuring points which were collected from seven typical loess profiles in Yanchang,Luochuan and Baoji area of northern Shaanxi,the authors summarized the dielectric and resistivity characteristics of loess,and found that the loess layer and the red soil layer could be significantly distinguished according to their electrical properties.Then the relationship and influence factors of electrical parameters of loess in northern Shaanxi were discussed. With the most detailed Chang-10-well loess section in Yanchang area as an example,the electrical characterization and description of the Chang-10-well loess section were described in detail. In addition,the following three problems were preliminarily explored： the theoretical feasibility for electromagnetic method such as GPR（ ground penetrating radar） to distinguish clay layer in the Loess Tableland; whether it＇s necessary to eliminate the influence of moisture content on electrical parameters; the establishment of a scientific earth-electricity model. The results obtained by the authors provide the theoretical foundation of loess electrical characteristics and the basis of interpretation for electromagnetic profiles and earth-electricity model of loess so as to probe into electromagnetic methods such as GPR（ ground penetrating radar） for distinguishing clay layer in the Loess Tableland.

关 键 词：黄土塬区 红土层提取 介电常数 电阻率 黄土地电模型 

分 类 号：P631[天文地球—地质矿产勘探]