双探测器密度测井仪器结构参数对测井性能的影响

对双探测器密度测井仪器,应用蒙特卡罗数值模拟方法研究短源距和短源距探测器准直孔角度变化对测井性能的影响.模拟计算结果表明,短源距对探测器计数和密度的补偿有影响,短源距过大,探测器计数统计涨落过大,短源距过小,不利于密度的补偿,因而短源距的选择要综合考虑这两方面的影响;短源距探测器准直孔角度对密度补偿的影响不大,但可以影响计数率.这些结果可为密度测井仪的设计以及优化提供参考.

The Effect of Structure Parameters on Logging Performance of Dual-detector Density Tool

For dual-detector density tool,Monte Carlo method is used to study the effect of the short-spacing and the angle of short-spacing detector collimating aperture on logging performance.The results of simulation indicate: the short-spacing influences the detector count and the density compensation,longer short-spacing leads to larger statistic fluctuation of detector count,too small short-spacing does harm to the density compensation,therefor the choice of short-spacing must consider both of them;short-spacing detector collimating angle has less influence on density compensation but can influence the detector count.The results can be references to design and optimize density logging tool.