摘要
根据相位差和幅度比转换得到电阻率是随钻电磁波电阻率测井信号处理的必然环节。文章介绍了随钻电磁波电阻率仪器测量原理,分析了地层介质电阻率与仪器所测得的幅度比和相位差的关系。分析认为要想将测量信号准确地转化为地层电阻率信息需要吊零刻度试验,用来消除电路和结构等因素引起的系统误差。通过水槽实验验证经过吊零刻度转换以后得到的电阻率值与用泥浆电阻率测试仪测得的水溶液的电阻率一致,验证了仪器以及测量方法的正确性和准确性。
Apparent resistivity could be derived from the attenuation and phase shift of electromagnetic wave,which is quite essential to signal processing of the electromagnetic wave propagation resistivity logging while drilling.The measurement principle of the electromagnetic logging while drilling tool is presented,and the relationship between the medium resistivity and the phase shift or amplitude ration is analyzed in the paper.It has been found that it is necessary to do air hang calibration to obtain formation resistivity from measured signals.Air hang calibration can eliminate the errors caused by circuit and structure of the tool.The resistivity derived from the tool after air hang calibration was consistent with the resistivity measured by mud-filtrator resistivity measuring tool in the water tank test.The results approve the validity of the tool and the accuracy of the measurement method.
出处
《石油仪器》
2012年第5期23-25,28,共4页
Petroleum Instruments
关键词
刻度
吊零
水槽试验
幅度比
相位差
calibration
air hang
water tank test
amplitude ration
phase shift
