井筒套管对井间电磁成像测井信号传输的影响  

Influence of wellbore casing on crosswell electromagnetic tomography signal

作　　者：陆洪[1] 刘菊[1] 陈林如[1] 

机构地区：[1]中国电波传播研究所,山东青岛266107

出　　处：《电波科学学报》2012年第4期754-759,共6页Chinese Journal of Radio Science

摘　　要：通过模拟柱状三层介质中电磁波传播特性,得到了井筒套管对井间传输的电磁信号的影响。将发射天线看作位于无限长圆柱形井筒套管中央的垂直磁偶极子,井筒套管内外是分布均匀的柱状三层介质,把电磁场用磁赫兹矢量位表示,推导了各个区域的电磁场积分表达式,利用数值积分计算了不同情况下的电磁场分布,分析了井筒套管电导率(材料)、厚度及测井工作频率对井间电磁成像测井信号的影响。Effect on crosswell electromagnetic signal is achieved by simulating elec- tromagnetic wave propagation characteristic in three layered cylindrical medium. Transmitting antenna is considered as vertical magnetic dipole located at the center of infinite long cylindrical wellbore casing, three layered homogeneous cylindrical medium surrounding the hole. Electromagnetic field is denoted with magnetic hertz vector, integral expression of electromagnetic field is deduced. Finally, electromag- netic field is computed by numerical integral, and the influence of casing conductivi- ty（material）, casing thickness, and frequency on the well logging signal is ana lyzed.

关 键 词：井间电磁成像 井筒套管 磁偶极子 磁赫兹矢量 

分 类 号：O441.5[理学—电磁学]