双感应测井刻度方法及测量误差分析

双感应测井中经常出现的测井一致性不好及不正常的负差异等现象与仪器使用中的刻度方法，刻度参数，测井操作方法，系统软件校正方法等有关，分析双感应测井刻度环感抗对刻度值的影响，采用谐振刻度方法，分别在刻度环呈感性，呈谐振，呈容性3种状态下进行相位调节比较，以刻度信号最大值消除了刻度信号相位偏移；采用积分法计算刻度系数必须同时采用谐振刻度法计算刻度电阻，地面系统对深感应进行反褶积滤波处理，且应先进行反褶积滤波，后进行趋肤效应校正，在1口标准井进行了实验，先在吉林油田推广应用，后在国内多个油田应用，效果十分明显。

Calibration Method for Dual Induction Log and Analysis of Its Measuring Errors

Poor log consistency and abnormal negative differences in dual induction log often have relation with the logging tool's calibration method, calibration parameters, log operations and software correction, etc.. A resonance calibration method, which means calibration under the condition of resonance, allows solving signal phase shifts resulted from calibration loops to remove the measuring errors due to the signal phase shifts. To get accurate calibration signals, we used integration algorithm for calibration coefficient, and the resonance calibration method for calculation of calibration resistivity. The current segment linear correction method for skin effect correction often generates errors at higher resistiviy, so it is replaced by normalized skin effect correction method. In dual induction log, the surface logging tool must make a deconvolution filtering of the deep induction log data, i.e., deconvolution filtering first, then skin effect correction. The resonance calibration method is first used in logging operation of Gugu-8 well, Shengli Oilfield, then generalized in Jilin and other oilfields in China, the data processing results of which are much better.