层状介质任意形状回线源瞬变电磁场正反演  

TEM FORWARD AND INVERSION OF ARBITRARY SHAPE LOOP SOURCE IN LAYERED MEDIA

作　　者：李建平[1] 李桐林[2] 张亚东 

机构地区：[1]山东科技大学地质科学与工程学院,山东青岛266510 [2]吉林大学地球探测科学与技术学院,吉林长春130026 [3]长庆油田公司勘探部,陕西西安710000

出　　处：《物探与化探》2012年第2期256-259,共4页Geophysical and Geochemical Exploration

基　　金：国家自然科学基金项目(41104068);国家高技术研究发展计划项目(2007AA060601);山东科技大学科学研究"春蕾计划"项目(2009AZZ010)

摘　　要：任意形状回线的电磁场可以看成是多个水平电偶极子的电磁场累加而成,因此,不论回线是何形状,只要将回线剖分为水平电偶极子,就可利用水平电偶极子的电磁场求取任意形状回线的电磁场。为了将回线剖分为电偶极子,根据测点到回线各边的距离将回线各边剖分为多个小段,使每小段满足水平电偶极子的条件;再将水平电偶极子进行数值积分,可得整个回线的电磁场。实验证明该方法在减小计算量的同时还能提高计算精度。The EM field of arbitrary shape loop can be regarded as EM field with the summation of many horizontal electric dipoles;therefore,as long as we work out the horizontal electric dipoles of the EM field and add them up,we can get the EM field of the arbitrary shape loop.The key of this method is the division of electric dipoles in arbitrary shape loop.In this paper,according to distance from the measuring point to the line of loop,each line of loop is divided into many small pieces with each piece satisfying the condition of horizontal electric dipole,and then numerical integration of horizontal electric dipole is carried out.In this way,the EM field of the whole loop can be obtained.Tests show that this method can not only reduce calculation amount but also improve calculation precision.

关 键 词：瞬变电磁场 回线源 正反演 回线剖分 水平电偶极子 

分 类 号：P631.3[天文地球—地质矿产勘探]