两种中子源条件下补偿中子测井仪探测器设计方法

Detector Designing Method of Compensated Neutron Logging Tool under Two Kinds of Neutron Source

使用同位素中子源或中子发生器将直接影响补偿中子探测器的参数设计,论文主要探讨了探测器源距设计方法,通过3700中子刻度筒实验,比较了两种中子源条件下的实验结果,采用数据拟合方法,给出了将测量得到的计数率比值转换为地层孔隙度的数学模型。结果表明,可以用中子发生器代替同位素中子源实现补偿中子测井。

It influences parameter designing of compensated neutron detector using isotopic neutron source or neutron generator. Designing method of determining neutron detector source distance is discussed in the paper. Measurement results are compared which done in 3700 calibration vessel under the condition of two kinds of neutron source. The mathematic module is given out to get formation porosity by the ration of counting rate where curve-fitting algorithm is used. It is showed that compensated neutron logging can be realized by using neutron generator instead of isotopic neutron source.