半空间垂直放置阵列感应测井仪器的刻度和误差校正

在考虑到了线圈系的有限尺寸情况下，详细计算了半空间垂直放置阵列感应测井仪器接收线圈的感应电动势和仪器常数刻度值，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．计算结果表明，背景信号（包括实部和虚部信号）和仪器常数刻度值均随发射线圈高度的增加而单值减小，若发射线圈距地面高度较高，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．论述了在半空间测量垂直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．将阵列感应测井仪器垂直放置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．

Calibration and Sonde Error Correction of the Tool Factor of a Vertical Array Induction Logging Equipment in Half Space

The influence of homogeneous ground conductivity on the calibration value of the tool factor of the logging equipment was analysed. The electromotive force induced in receiver coils and the tool factor were calculated in half space. And the factor of finite coil size is considered in the calculation. The results show that background signals and the calibration value are decreased with the increase of the coils height from ground, and that if the height is great and the ground conductivity is small, the influence of the conductivity on the calibration value can be neglected. The theory and the method are discussed for measuring the sonde errors of the logging equipment in half space. The error correction charts and formulae are obtained. If ground conductivity is not known, by vertically placing the equipment at two different heights, the sonde errors of the output curves of every arrays can be determined according to the relationship between background signals and the differance of lower and upper signals.