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.

• 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。