航磁梯度数据在磁性地质体边界判断方面的研究  

Using Airborne Magnetic Gradiometer Data to Determine Magnetic Rock Mass Boundary

作　　者：郭华[1,2] 贾伟洁[2] 王平[1,2] 谢汝宽[2] 

机构地区：[1]中国地质大学(北京)地球物理及信息技术学院,北京100083 [2]中国国土资源航空物探遥感中心,北京100083

出　　处：《吉林大学学报（地球科学版）》2015年第1期273-281,共9页Journal of Jilin University：Earth Science Edition

基　　金：国家"863"计划项目(2013AA063901);中国地质调查局地质大调查项目(12120113099000)

摘　　要：完全国产化的航磁全轴梯度勘查系统已开展了测量工作,并获得了比较理想的梯度数据,但是如何利用梯度数据进行磁性地质体边界圈定还处于研究阶段。笔者先给出了航磁全轴梯度测量原理;然后着重从利用梯度数据尤其是垂向梯度数据进行岩体边界圈定等方面进行了讨论研究,认为航磁梯度数据相比于总场数据在地质体边界判断方面可提供更加丰富的地球物理信息;接着提出了梯度数据需要在判断磁性地质体边界上进行化极处理,并根据垂向梯度数据零值线确定地质体边界的原则,圈定磁性地质体的边界位置。与实际地质情况的对比表明,利用梯度数据圈定磁性地质体边界的应用效果比利用总场数据的效果明显。Three Axis Airborne Magnetic Gradiometer with self-owned intellectual property rights was developped,and carried out gradient measurements of aeromagnetic survey in given area of North of China,which gain the ideal gradient data.However,how to apply the gradient data for geological interpretation is still in research stage.In this paper,how to use the gradient data in the lithology determining and rock mass boundary delineating are studied based on airborne three axis gradient measurement principle.Aeromagnetic gradient survey is divided into horizontal gradient,vertical gradient,and three axis gradient measurement.Data from hree axis gradient provides more abundant geophysical information in lithologic judgment.It shows that the effect of lithologhy judgment and rock mass boundary is reasonable using the gradient data Compared with the actual geological condition.Because of the characteristic of the gradient data in suppressing background field,not only the approximately buried depth of the rock mass can be estimated,and the boundary position of the rockmass can be accurately determined.

关 键 词：航磁全轴梯度系统 梯度测量原理 岩性判断 边界圈定 

分 类 号：P631.2[天文地球—地质矿产勘探]