摘要
Z轴倾子电磁法(ZTEM)是一种极具前景的新型天然源频率域航空电磁法,具有勘探深度较大,工作效率高的特点.本文基于大地电磁法(MT)三维数据空间OCCAM反演算法,实现了三维ZTEM倾子资料的数据空间反演算法.将该算法应用到理论合成算例中进行反演,反映出ZTEM倾子反演对模型横向边界的约束优于垂向的特性,并且与MT阻抗反演结果进行对比,验证了所实现的倾子资料三维数据空间反演算法的有效性,表明ZTEM倾子反演在约束电阻率模型横向位置能力上更具优越性.该反演算法可用于ZTEM所整理得到的倾子数据进行三维定量反演,实现大区域的地质构造三维成像,获得地下地质模型的电阻率结构信息.
Z-Axis Tipper Electromagnetic（ ZTEM） technique is a promising new-type frequency-domain airborne electromagnetic system which measures the magnetic fields that result from natural source. It has the advantage of effective data acquisition procedure and great exploration depth compared with the artificial source helicopter EM method. This paper develop a 3 D data-space OCCAM inversion algorithm to invert tipper data of ZTEM. The algorithm is applied to synthetic examples for inverting,and shows the ability of recovering the model in lateral boundary constraint is superior to vertical constraint. The synthetic example demonstrates the validity of the data-space OCCAM approach for inverting tipper data of ZTEM. Compared with the inversion of MT impedance data,the inversion of ZTEM tipper data have an advantage of the lateral constrain of resistivity model. This algorithm is suitable for inverting the tipper data acquired from the ZTEM and achieve 3 D geological structure imaging of large area so as to obtain geoelectrical structure underground.
作者
李志强
荣耀
谭捍东
LI Zhi-qiang;RONG Yao;TAN Han-dong(Jiangxi Transportation Institute,Nanchang 330200,China;School of Geophysics and Information Technology,China University of Geosciences（Beijing）,Beijing 100083,China)
出处
《地球物理学进展》
CSCD
北大核心
2018年第4期1526-1532,共7页
Progress in Geophysics
基金
国家自然科学基金项目(41374078)
江西省交通运输厅科技项目(2015C0067)联合资助
关键词
ZTEM
倾子
三维反演
数据空间法
航空电磁
Z-Axis Tipper Electromagnetic
tipper
three-dimensionalinversion
data-space method
airborne electromagnetic
