摘要
磁测资料处理解释通常需要已知场源的磁化方向信息.在剩磁影响下,总磁化方向与感应磁化方向并不一致,这使得处理解释变得复杂.本文研究提出从近等轴状磁总场异常估计磁化方向的偶极源互相关法,即用磁偶极源的理论磁异常与实测磁异常作互相关,用一系列递变的偶极源位置和磁化方向做试错,取互相关最大化对应的磁化方向作为估计结果.理论数据试验和中国西北某金属矿勘探区航磁资料试验表明本文方法能从近等轴状磁异常有效估计出总磁化方向.
Processing and interpretation of magnetic data usually require the information of total magnetization direction.However,under the effects of remanent magnetization,the total magnetization direction differs from the induced magnetization direction.This makes the data processing and interpretation complexity.In this paper,I presented the cross correlation of magnetic dipole source for determination of magnetization direction from magnetic total field anomaly.The method calculates cross field anomaly caused by a magnetic dipole source,by using a set of varying parameters of positions and correlation coefficient between the observed magnetic total field anomaly and the theoretical magnetic total maximum correlation coefficient is regarded as the estimated total magnetization direction.Tests on both synthetic data and real aeromagnetic data from a mineral exploration in northwestern China demonstrated that this method estimates the magnetization direction reliability,especially when the magnetic total field anomalies are approximate equiaxial.
出处
《地球物理学进展》
CSCD
北大核心
2014年第4期1748-1751,共4页
Progress in Geophysics
基金
科技部国际合作重点项目“远东地区地磁场、重力场及深部构造观测与模型研究”(2011DFB20210)
中国地震局地球物理研究所基本科研业务专项(DQJB12B14,DQJB12B20)
四川省芦山“4.20”7.0级强烈地震科学考察(1301001)
地下信息探测技术与仪器教育部重点实验室(中国地质大学,北京)开放课题项目(GDL1203)联合资助
关键词
剩磁
磁化方向
偶极源
互相关
remanent magnetization
magnetization direction
magnetic dipole source
cross correlation
