边界单元法三维磁场曲化平及边界改正  

Transforming Three Dimensional Magnetic Data on an Arbitrary Surface into a Plane and Boundary Correction With Boundary Element Method

作　　者：匡应平[1,2] 张小路[1] 

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004 [2]中国冶金地质总局中南地质勘查院物化探分院,武汉430081

出　　处：《桂林工学院学报》2009年第3期318-322,共5页Journal of Guilin University of Technology

摘　　要：在实际的野外磁法勘探中,地形起伏使磁异常曲线变得复杂或者使异常曲线特征点变得不明显,直接影响和降低了磁法勘探的地质效果。为了突出磁异常信息,校正地形对磁异常曲线的影响,曲化平是一种有效的方法,边界单元法是磁场曲化平的一种原理简单而实用的数值计算方法,但该方法存在边界效应问题。本文利用插值的方式处理边界效应问题,大幅降低边界点的相对误差,使边界单元法在三维磁场曲化平方面的优势得到了充分发挥。模型计算表明该方法是可行的,能高效精确处理三维磁场曲化平问题。In magnetic field prospecting,the hypsography will make magnetic anomaly curve complexity or magnetic anomalies curve character unconspicuous,and reduce directly the geological effect of magnetic prospecting.In order to give prominence to the magnetic anomaly information,correct the landform effect for magnetic abnormal curves,the method of reducing arbitrary surface into a plane is used.The boundary element method is a simple and practical digital solution on reducing anarbitrary surface into plane,but this method has the boundary effect problem.This paper discusses the boundary effect issue with the interpolation,reduces the relative error of the boundary point and enable the boundary element method to the full display in reducing from anarbitrary surface into plane of three dimensional magnetic.The computation on model indicates that this method is suitable,and can highly effective reduces an arbitrary surface into a plane for the three dimensional magnetic.

关 键 词：边界单元法 外推法 插值 曲化平 三维磁场 

分 类 号：P631.2[天文地球—地质矿产勘探]