基于畸变3个因子的MT畸变曲线改正方法与应用  

A METHOD TO CORRECT MT CURVE ON 3 DISTORTION FACTORS AND ITS APPLICATION

作　　者：胡玉平[1] 鲍光淑[1] 贾继标 

机构地区：[1]中南大学信息物理工程学院,长沙410083 [2]北京地质矿产研究院,北京100012

出　　处：《地质与勘探》2005年第6期75-79,共5页Geology and Exploration

摘　　要：大地电磁测深(MT)曲线畸变是一个普遍存在的现象。文章在总结前人研究的基础上,采用只求取畸变3个因子的方法,就可得到区域阻抗;避免了GB分解方法的一些问题:1)求解参数多;2)需要对求解参数作限制;3)观测误差影响反演结果;4)在有些情况下,不易求解;5)损失三维电性信息。经实测数据的计算,该方法被证实是有效的。Curve distortion is common in magnetotelluric （MT） prospecting survey. Base on predecessor results, impedance distortion formula resulting from geological noise from general situation is deduces. This method can get regional impedance only by the distortion 3 factors, which avoids the following problems of GB decomposition. Firstly, there are too many parameters to be calculated. Secondly, it is necessary to constraint the parameters to be calculated. Thirdly, the observed errors have much effluence on inverse results. Fourthly, it is difficult to calculate in some cases. Lastly, 3-D information is lost. Calculation of observed data in the field proves that the method is practical and effective.

关 键 词：大地电磁测深 曲线畸变 阻抗张量分解 畸变因子 

分 类 号：P631.3[天文地球—地质矿产勘探]