双发单收谐振型电磁波测井线圈系刻度方法研究

增大源距是提高随钻电磁波电阻率测井仪器探测深度的有效方法，但是接收信号随源距增大严重衰减。本文将谐振原理引入随钻电磁波电阻率测井，采用双发单收谐振型线圈系结构，提高接收线圈的电压幅度。实验室通常采用刻度环模拟地层电导率，开展仪器响应特性研究。双发单收谐振型线圈系的刻度方法与传统的开路线圈系结构完全不同。本文基于DOLL几何因子理论，对双发单收谐振型线圈系刻度环参数选择方法进行研究，发现参数选择应该兼顾相对平稳度与刻度环电阻分辨度，以减小测量误差。实验比较了均匀地层中接收线圈开路和谐振响应特性，表明谐振方法只增大了接收响应的幅值而没有改变幅度比，验证了刻度环参数选择方法的正确性以及谐振方法的正确性。

Calibration of double-emission and single-receiving resonant electromagnetic wave logging coil system

Increasing the source distance from the recei-ver is an effective way to increase the detection depth of the electromagnetic wave resistivity logging-while-drilling tool,but in this case the received signals are seriously attenuated.In this paper,the principle of resonance is introduced into the electromagnetic wave resistivity logging-while-drilling,and a double-emission and single-receiving re-sonance coil system is used to increase the voltage amplitude of the receiving coil.The scale loop si-mulation formation conductivity is often used in laboratories to conduct research on instrument response characteristics.The calibration method for the double-emission and single-receiving resonance coil system is completely different from that of conventional open coil systems.Based on Doll geometric factor theory,the calibration ring parameter selection of the double-emission and single-receiving resonance coil system is studied,and it is found that the parameter selection should be compromised between the relative degree of stability and the scale ring resistance resolution to reduce the measurement error.An experimental platform is built and open-circuit response characteristics and resonant response characteristics of the receiving coil in a uniform layer are compared.The results show that the resonant method only increases the amplitude of the receive response without changing the amplitude ratio,which verifies the correctness of the scale ring parameter selection and the correctness of the resonance method.