磁总场梯度数据三维反演方法及应用  

3D Inversion of Gradients of Total Field Magnetic Anomalies and its Application

作　　者：孙石达 张青杉[1,2] 陈超[2] 王浩然[2] 陈海弟[1] 戴继舒 

机构地区：[1]中国冶金地质总局地球物理勘查院,河北保定071000 [2]中国地质大学(武汉)地球物理与空间信息学院,地球内部多尺度成像湖北省重点实验室,湖北武汉430074

出　　处：《地质与勘探》2015年第6期1016-1024,共9页Geology and Exploration

基　　金：国家“973”计划课题(编号:2012CB416805);科研院所基本科研资金资助项目(编号:WHS201211)联合资助

摘　　要：磁总场三方位梯度数据相对于总场数据包含更丰富的异常信息,将梯度数据应用于三维磁化率反演中,可以更准确地描述异常体。本文采用最小模型结构反演方法进行三维磁化率反演成像,并采用对数障碍法对磁化率的反演取值范围进行约束。通过模型试验,对磁总场异常数据及其三轴梯度数据进行单独反演、联合反演,结果表明三轴梯度联合反演结果可以更好地刻画异常体形态,更有效地分辨邻近异常体,反演物性更合乎实际。将此反演技术应用于大冶铁矿高精度航磁数据反演解释,取得了较好的应用效果。The 3-direction gradients of total-field magnetic anomalies （AT） contain more information compared with AT.Applying such data to 3D in- version of susceptibility allows us to describe anomaly bodies more accurately.This wnrk employs the minimum-structure inversion method to conduct such inversion and uses the logarithmic barrier method to constrain the susceptibility limits.We compare the recovered models from inverting data AT,their gra- dients independently and jointly .separately.The results indicate that the inversion gradients,especially by the joint inversion,are capable of distinguishing nearby sourees and can describe the sources more completely and exactly,and the inverted physical properties are closer to the true ones.And we apply this method to the aeromagnetic data acquired in Daye for inversion and interpretation,and obtain good results.

关 键 词：磁总场梯度磁化率 最小模型结构反演 对数障碍法 

分 类 号：P631[天文地球—地质矿产勘探]