可控源音频大地电磁法在寻找隐伏铝土矿中的应用  

Application of CSAMT Method in Concealed Bauxitea Mineral Exploration

作　　者：孙治新[1] 付俊清[1] 杜婉怡 

机构地区：[1]河南省航空物探遥感中心,河南郑州450053

出　　处：《甘肃冶金》2016年第4期83-86,共4页Gansu Metallurgy

摘　　要：简单介绍了可控源音频大地电磁法(CSAMT)的工作原理及工作区的地质和地球物理特征,重点介绍了CSAMT法在荥阳地区寻找隐伏铝土矿中的应用。通过成都理工大学编写的MTSoft2D软件包的1D OCCAM反演结果为初始模型,进行多次2D非线性共轭梯度(NLCG)迭代,很好的压制了由于地表不均匀体造成的深层奥灰岩面失真的现象,较为准确地定位出奥陶系灰岩界面的起伏特征及埋藏深度,结合工作区铝土矿的成矿规律,对区内的铝土矿的空间赋存做出了较为准确的判断。This paper broadly introduced the controlled source audio-frequency magnetotelluric method （CSAMT） working principle and the geological-geophysical characteristics of the working area, mainly introduced the application of CSAMT method in searching for concealed bauxite in Xingyang. With the 1D OCCAM inversion results produced by the MTSoft2D software package developed by Chengdu University of Technology as the initial model, multiple 2d nonlinear conjugate gradient （NLCG） iteration were carried out, the distortion of deep limestone face arisen from uneven surface body was effectively suppressed, the fluctuation characteristics of the ordovician limestone interface and the buried depth were even accurately positioned. In combination with the mineralization rule for the bauxite workspace, a more accurate judgment for the occurrence of the bauxite was made.

关 键 词：CSAMT 隐伏铝土矿 MTsoft2D 奥陶系灰岩 

分 类 号：P631.325[天文地球—地质矿产勘探]