应用脉冲中子实现热中子孔隙度测量  

Thermal neutron porosity using pulsed neutron measurement

作　　者：刘蕊 刘富华 王滨涛 

机构地区：[1]大庆测井公司地球物理所

出　　处：《石油仪器》2014年第1期48-50,100,共3页Petroleum Instruments

摘　　要：文章主要介绍一种用脉冲中子发生器测得数据计算等效热中子孔隙度的方法。此方法使用中子减速长度,俘获截面和密度来预测使用化学源的传统热中子仪器测量的计数率。该算法的核心是将脉冲中子发生器测得的中子减速长度转化为便于解释的等同于镅-铍源测得的中子减速长度的形式。The paper introduces a new method computed an equivalent thermal neutron porosity using measurements derived from a pulsed neutron generator tools.The method uses neutron slowing-down length,capture cross section,and density to predict the count rate ratio that would be measured by a traditional thermal neutron tool using an americium-beryllium source.A critical component of the algorithm is a relationship that converts slowing-down lengths measured in a formation for neutrons created by a pulsed neutron generator to slowing-down lengths that would be observed in the same formation if the source were americium-beryllium.

关 键 词：孔隙度 热中子 超热中子 PNG 减速长度 镅 铍 

分 类 号：P631.81[天文地球—地质矿产勘探]