半空间水平放置阵列感应测井仪的刻度及误差校正

论述了在半空间测量水平放置阵列感应测井仪器线圈系误差的理论和方法,给出了误差校正图版和误差校正公式;讨论了半空间中均质地层电导率对仪器常数刻度值的影响。将阵列感应测井仪器水平悬挂在距地面两个不同的高度处,根据预先确定出的背景信号与信号差之间的关系,可以在无需知道地层电导率的情况下确定出每个单元阵列不同输出曲线的线圈系误差。计算结果表明:若线圈系距地面高度较高,且地层电导率值较小,则地层对仪器常数刻度值的影响可以忽略。

The Calibration and Sonde Error Correction of Horizontal Array Induction Logging Tool in Half Space

The theory and method for measuring the sondeerrors of horizontal array induction logging tool in half space are discussed, and the correction chartsand correction formulae are presented. The influence of conductivity of homogeneous formation on the cal-ibrating value of the tool factor in half space is dis-cussed. According to the predetermined relationship between background signals and the difference of lower and upper signals, the sonde errors of individ-ual output curves of each array can be determinedwith the tool horizontally hanging at two different heights, even if the conductivity of the formation is unknown. The results suggest that influence of the formation on the calibrating value of the tool factor can be neglected if the coils are far away form the surface and the formation conductivity is small.