补偿中子孔隙度的计算和校正

Calculation and Correction of Compensated Neutron Porosity

杜斌．补偿中子孔隙度的计算和校正．测井技术，１９９５，１９（６）：４４７～４５２本文给出了数控测井系统中一种新的补偿中于孔隙度的计算方法和校正模型。通常补偿中子测井的孔隙度计算是在两观测点离源足够运，两点中子通量的比值几乎消除有关热中子参数影响的假设条件下进行的。而实际情况并不理想，加之受到统计涨落及井眼环境的影响，必须对仪器读数进行校正。本文给出了校正方法及参数。

A new algorithm and correction model of compensated neutron porosity for computerized logging system are given. Generally, the traditional calculation of CNL porosity is based on the hypothesis that the two detecting points are far enough from the source, and that the effects of thermal neutron diffusion parameters are almost eliminated by the ratio of neutron flux at the two measuring points. In fact,some errors exist in nuclear decay due to borehole effects and statistical fluctuation. It is necessary to correct the porosity by means of the technique discribed in this paper.