从瞬变电磁测深数据到平面电磁波场数据的等效转换  

Equivalent transformation from TEM field sounding data to plane-wave electromagnetic sounding data

作　　者：薛国强[1] 李貅[2] 郭文波[3] 宋建平[3] 底青云[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]长安大学地质工程与测绘工程学院,西安710054 [3]西安交通大学电子与信息工程学院,西安710049

出　　处：《地球物理学报》2006年第5期1539-1545,共7页Chinese Journal of Geophysics

基　　金：国家973项目(2002CB412702);中国科学院知识创新工程重要方向资助项目(KZCX3_SW_134);中国博士后基金(2005038388);中国科学院王宽诚博士后奖励基金资助

摘　　要：中心回线源装置的瞬变电磁场是一种涡流场,在地下主要以扩散形式传播.平面电磁波在地下介质中传播时具有反射、折射等电磁学特性,为了借鉴平面电磁波场测深成熟的解释方法,文中开展了从瞬变电磁涡流场测深数据到平面波场数据的快速等效转换的研究.通过大量的理论模型的正演计算、曲线对比,误差统计,对瞬变电磁场、平面波场在地下传播机制特性的分析,建立了一种由瞬变电磁测深视电阻率数据向平面波场测深视电阻率数据转换的时间-频率等效对应关系.利用这一关系式,把扩散场数据快速转换成等效平面波场测深数据.为进一步进行瞬变电磁拟平面波成像解释打下理论基础.The in-loop TEM field is a kind of vertex field propagating in a way of diffusion in the earth mainly. Plane-wave of electromagnetic has the features of reflection and refraction during the propagation in the earth. In order to draw on the experience of well processed method of electromagnetic plane-wave, we study equivalent transformation from TEM diffusion field sounding data to plane-wave electromagnetic sounding data. An equivalent transformation relationship between time and frequency domains can be constructed after theoretical model forward calculation, curve comparison, errors analysis and the theoretical discussion about the propagation of diffusion field and plane-wave. Using this transformation, the diffusion field sounding data of TEM apparent resistivity can be quickly turned into the equivalent data of plane-wave sounding data . The result lays the foundation for the further study of TEM pseudo-seismic plane-wave interpretation.

关 键 词：瞬变电磁 扩散场 平面波场 视电阻率 等效转换 

分 类 号：P631[天文地球—地质矿产勘探]