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利用解析法计算随钻方位电阻率仪器激发的电磁场随仪器方位变化的规律,研究其在地层界面预测中的应用。通过分析电磁波在各层介质中的反射和透射规律,得出了介质层中电磁波的解析表达式,计算了电磁波电阻率随钻测量的幅度衰减和相移,分析了定向电磁测量对地层界面的灵敏性,研究了地层相对倾角和接收天线倾角对电磁测量的影响。研究表明,线圈距和目的层厚度越大,定向电磁测量的探测范围越大;随着地层相对倾角和接收天线倾角的增加,定向幅度衰减在接近地层界面时的变化越明显,对地层界面的灵敏性增强。结合方位电阻率成像和定向电磁响应说明,在常规随钻电阻率仪器的基础上,增加倾斜接收天线,可以实现地层倾向的预测和判断。
The analytic method is used to calculate the electromagnetic field excited by the azimuth resistivity instrument along with the change of azimuth of instrument, and its application in the prediction of formation interface is studied. By analyzing the law of reflection and transmission of electromagnetic wave in each layer medium, the analytical expression of electromagnetic wave in the medium layer is obtained. The amplitude attenuation and phase shift of the electromagnetic wave resistivity while drilling are calculated. The influence of directional electromagnetic measurement on the formation interface Sensitivity, the influence of relative dip of formation and receiving antenna dip on electromagnetic measurement was studied. The results show that the larger the thickness of the coil and the target layer, the greater the detection range of the directional electromagnetic measurements. As the relative dip of the formation and the inclination of the receiving antenna increase, the directional amplitude attenuation changes more obviously when approaching the formation interface, Increased sensitivity. Combined with the azimuthal resistivity imaging and directional electromagnetic response, we can predict and judge the formation propensity by adding inclined receiving antennas based on the conventional logging-while-drilling resistivity instrument.