关于CSAMT法若干个问题的探讨  

Discussion of Several Issues about CSAMT Method

作　　者：马婵华[1] 鲁霞[2] 赵玉红[1] 李颖[1] 

机构地区：[1]成都理工大学地球物理学院,四川成都610059 [2]四川省核工业地质调查院,四川成都610061

出　　处：《工程地球物理学报》2013年第5期661-665,共5页Chinese Journal of Engineering Geophysics

摘　　要：可控源音频大地电磁测深法(CSAMT)以其探测深度大、分辨率高等特点广泛应用于隧道前期勘查、地下水资源勘查、金属矿产勘查、石油勘查等领域,可取得常规电法和地震法无可比拟的勘查效果。然而由于在实际测量中受地形和不均匀体的影响,会使CSAMT曲线发生畸变,即静态效应和近场效应。这种现象如果在资料处理中得不到消除,就会造成资料解释的误差甚至错误。文中通过CSAMT在实际工程勘探中的应用,介绍了静态效应以及近场效应对CSAMT资料的影响、如何对CSAMT资料进行静态校正和近场校正、对CSAMT资料进行静态校正和近场校正后的效果。最后,对四川某地存在静态效应和近场效应的CSAMT测量原始数据进行校正,效果较好。CSAMT with its characteristics of big exploration depth and high resolution has been widely used in pre--tunnel investigation,groundwater resources investigation, oil sur- vey fields, which can make better result than the conventional method and the seismic meth- od. But in actual surveying, CSAMT curve can be distorted because of the influence of ter- rain and heterogeneous body, so called static effect and near field effect, which makes a great difference in the data interpretation and data accuracy. In this paper the static effect and near field effect on CSAMT data are introduced, static correction is presented and the result is indicated after static correction and near field correction with the actual application of CSAMT in the engineer prospecting. Finally, CSAMT original data existing static effect and near field effect in the certain place of Sichuan are corrected, and good results are ob- tained.

关 键 词：CSAMT 静态效应 静态校正 近场效应 近场校正 

分 类 号：P631[天文地球—地质矿产勘探]