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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 electromagnetic wave propagation characteristics of the inclined antenna system while its drilling electromagnetic wave resistivity tool is simulated numerically by means of the vector of magnetic flux of the horizontal laminar anisotropic medium. The current at the interface between the axial antenna and the inclined antenna is compared The principle of detecting the interface position and orientation of the stratum by electromagnetic wave propagation in the inclined antenna system is revealed theoretically.The amplitude attenuation and phase shift of the voltage when using the tilted antenna system are analyzed and the method of selecting the dip angle of the antenna system is given theoretically The selection method of transmitting frequency and source distance parameters is described in detail and the applicable source distance range of different transmitting frequencies is given.The results are consistent with the parameters of the two existing directional electromagnetic wave resistivity logging while drilling tools in China The research and development of logging tools and logging data interpretation laid the theoretical foundation.