E-E_x广域电磁法对低阻薄层分辨能力探讨  

Distinguish ability on thin resistant layered structure of E-E_x mode of wide field electromagnetic sounding method

作　　者：胡涂[1,2] 李帝铨[1,2] 

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]中南大学有色金属成矿预测教育部重点实验室,长沙410083

出　　处：《物探化探计算技术》2014年第3期297-303,共7页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金(41204054)

摘　　要：对E-Ex模式广域电磁法对低阻薄层结构的分辨能力和在传统意义上"近区"的勘探能力进行了探讨。近期关于广域电磁法的工作重心都放在二、三维正反演上,从一维响应出发,设置了几组含有低阻薄层结构的一维地质模型,正演得出全区视电阻率曲线,了解到广域电磁法对低阻薄层的分辨能力;分析曲线特征,并与可控源音频大地电磁法(CSAMT)一维数值模拟结果进行对比,得出广域电磁法在"近区"工作的优越性。The superiority of the E-Ex mode of Wide field electromagnetic sounding method （WFEM）on near field and distin-guishing ability of the structure with a thin layer with low resistance is discussed.More concerns were put on the 2D or 3D for-ward and inversion computation recently.While this paper set up several groups of 1D geological model containing low resist-ance thin layered structure,drawing the apparent resistivity curves,analyzing features of curves,and knowing the ability of distinguishing the low resistance with thin layer structure.And then compared with the one-dimensional numerical simulation results of CSAMT,the contrasted result shows the superiority of the E-Ex mode of wide field electromagnetic sounding meth-od on near field,and helps to know the aspects of wide field apparent resistivity.

关 键 词：广域电磁法 近区 低阻薄层 

分 类 号：P631.325[天文地球—地质矿产勘探]