摘要
采用水平层状各向异性介质中的磁流源并矢Green函数数值模拟了倾斜天线系随钻电磁波电阻率测井仪的电磁波传播特性.比较了轴向天线和倾斜天线在地层界面处的电流特性,从理论上揭示了倾斜天线系电磁波传播随钻测量探测地层界面位置及方位的原理.分析了采用倾斜天线系时电压的幅值衰减和相位移,理论上给出天线系倾角的选择方法.详细阐述了发射频率和源距参数的选择方法,给出了不同发射频率适用的源距范围.研究结果与现有两种国外定向随钻电磁波电阻率测井仪的参数一致,为国内定向测井仪器的研发及测井数据解释奠定理论基础.
The characteristics of a kind of electromagnetic wave resistivity measurement while drilling（ MWD） tool with tilted antennas are computed via the magnetic-current-source dyadic Green＇s function for horizontally stratified anisotropic media. The current characteristic at the formation interface of the tilted antennas is compared with the axial antenna,and how the MWD tool with tilted antennas to detect the formation interface position and orientation is revealed. The amplitude-attenuation and phase-shift characteristics of tilted antennas MWD tool are analyzed,and how to design the angle of tilted antenna is presented. The relationship between the emitting frequency and emitting-receiving antenna space parameters is expounded,and the emitting-receiving antenna space parameter suitable for the different frequency is presented. The research results is consistent with two kinds of foreign directional MWD electromagnetic wave resistivity logging tool parameters and is valuable for the research and development of the directional well logging instrument and the logging data interpretation in China.
出处
《地球物理学进展》
CSCD
北大核心
2016年第3期1216-1223,共8页
Progress in Geophysics
基金
国家科技重大专项"过套管电阻率测井仪刻度检测装置研究"(2011ZX05020-004-05)
陕西省教育厅专项科研计划项目"三分量感应测井仪器设计研究"(11jk0783)联合资助
关键词
定向电磁波传播
随钻测量
倾斜天线系
并矢Green函数
directional electromagnetic propagation
measurements while-drilling（MWD）
tilted antennas
dyadic Green＇s function
