随钻电磁波电阻率测井仪器响应影响因素数值模拟

Numerical Simulation on Influence Factors of Electromagnetic Wave Resistivity Logging While Drilling Response

介绍了随钻电磁波电阻率测井仪器的响应原理及计算模型。通过数值模拟不同地层模型仪器响应,分析了随钻电阻率测井中仪器精度、井眼、井斜与层厚、各向异性、介电常数以及泥浆侵入等因素对电阻率的影响。对于目前数据处理和解释中地层模型不够准确、应用软件都无法同时处理各种影响因素、同时考虑到各种环境因素进行资料的反演几乎不可能、对地层反演结果的不确定性等问题提出建议。为正确利用随钻电磁波测井资料提供理论依据。

Introduced are response principle and calculation model of electromagnetic wave resistivity logging while drilling tools. With numerical simulation of different formation models, analyzed are the main influence factors on resistivity responses including accuracy of the tool, borehole, inclination and bed thickness, anisotropy, dielectric constant and mud-filtrate invasion. In current log data processing and interpretation, the formation models are not accurate enough, ap- plication software can not simultaneously deal with all kinds of influence factors, it is almost impossible for data inversion with considering various environmental factors and the formation inversion results are also uncertain, based on which proposed are some suggestions to correctly use the logging data of electromagnetic wave resistivity logging while drilling.