包气带土壤含水率和石油类污染特性对电阻率监测的影响  

Influential features of the water and oily content contamination in the vadose soil on the electric resistivity

作　　者：马玉慧[1] 杨悦锁[1,2] 范伟[3] 路莹[1] 杜新强[1] 

机构地区：[1]吉林大学地下水资源与环境教育部重点实验室,长春130021 [2]沈阳大学区域污染环境生态修复教育部重点实验室,沈阳110044 [3]东北师范大学环境学院,长春130024

出　　处：《安全与环境学报》2016年第1期299-303,共5页Journal of Safety and Environment

基　　金：国家自然科学基金项目(41472237;41272255;41302196);国家科技部"863"项目(2007AA06Z343)

摘　　要：基于水-油二相体系多孔介质电学性质的Archie理论,探索石油类有机污染土壤物化特征的电阻率指示,对形成适用于污染场地野外勘察及室内模拟试验研究的"非扰动"监测分析方法具有重要的现实意义。采用Miller Soil Box方法研究了东北油田区4种介质在不同电路特征、介质、含水率、孔隙液体(石油污染及盐污染对照)及环境温度条件下的电阻率响应规律,拟合构建了激发-响应关系。结果表明:在室温20℃、不添加任何污染物的条件下,随含水率增加,电阻率呈幂函数关系减小;砂样孔隙液体中所含电解质强弱直接影响其电阻率;在水-油两相体系中砂样电阻率关系曲线都与Archie公式拟合较好;砂样电阻率随温度增加而降低,在0℃以下随温度降低呈直线上升趋势。For the sake of promoting the establishment of a feasible and practical ＂non-intrusive＂ monitoring and analysis methodology for field investigations and lab simulations for the petroleum contamina- tion, this paper would like present a systematic study of electrical re- sistivity responses of physiochemical characterization of the petroleum contaminated soil and/or groundwater based on the Archie theory of the two-phase water-oil system in porous media. For the said pur- pose, we have first of all examined the power design, the soil type, the water content and the pore fluid （salt and oil） and the ambient temperature conditions of the four different soil media by way of test- taking the oil-contaminated site in the North East China. In our re- search, we have adopted the Miller soil box system to study the corre- lation between the actual environmental conditions of the site and their electric resistivity response, through which we have gained a series of stimulus-response relation via the curve matching between the resis- tivity and the soil physiochemical features. The results demonstrate that there exists a typical inverse power function relationship between the soil water content and the resistivity if there were no contaminant stimulus at the normal environment temperature of 20℃ . In addi- tion, we have found that the lower the porosity and proper connectivi- ty, the smaller the resistivity of the heterogeneous sands than the nor real homogeneous sand. The intensity of electrolyte in the sand pore fluid may tend to impose a direct impact on the resistivity, whose re- sistivity breakthrough points may turn to be well matched with the Arehie formula in the two-phase water-oil system. On the other hand, the resistivity of the natural sands and the oil-contaminated sands may tend to decrease with the surrounding temperature. For example, the notable resistivity of the sands may tend to decrease greatly under the temperature below 0 ℃. For example, obvious change may take place with the sand resistiv

关 键 词：环境工程学 土壤环境 电阻率 含水率 石油污染 温度 

分 类 号：X833[环境科学与工程—环境工程]