球体磁力异常三分量数据空间成像

目前的三分量磁测不同于以往地面磁法勘探中的水平分量、垂直分量或是磁异常总场的单一测量，而是同时测量出地磁场的三个分量（Za，Hax，Hay或T，D，I）的矢量测量，增加了来自于场源的信息量，并且三分量磁测数据具有矢量空间性，在图形成像方面可以克服单一分量平面图示的单调性，利用全空间矢量指向，可以提高对场源地质解释的可靠程度。本文基于球体模型来研究磁异常三分量的成像原理及特征规律，进而为研究实际磁源体奠定理论基础。首先正演计算出三个方向分量的数据为三维成像的绘制提供可靠保证，然后在Visual C＋＋6．0的MFC开发环境下，结合OpenGL的库函数进行三维图形的绘制。所编写的绘图软件可提供对应三分量磁力仪测量数据的成像功能，为三分量磁力仪的应用作一些基础性工作。

Three-Component Data Space Imaging of Spherical Magnetic Anomaly

Present three--component magnetic survey is different from the old horizontal, vertical component, or a single measurement of the total magnetic anomaly field in the ground magnetic prospecting. It measures three components （Za, Hax, Hay or T, D, I） of the geomagnetic field at the same time, which increases the information from source field. Meanwhile, the three--component magnetic data are of vector and spatiality, thus, it avoids the monotonous plane graph of a single component, and also can improve the credibility of geological interpretation on source field by using the full--space vector direction. On the basis of spherical model, this paper studies the imaging features and rules of mag- netic anomaly, providing theoretical basis for the actual magnetic body research. First, it calculates the component data from the three directions, and makes it creditable for 3D imaging. Then, under MFC in Visual C＋＋ 6.0, it combines with library function in OpenGL and draws 3D graphs. The graphic program has data imaging function for the corresponding three--component magnetometer, and does some basic work for the application of threecomponent magnetometer.