摘要
随着地层元素测井的发展,提高探管中探测器分辨率是技术人员研发重点之一。近年来,LaBr_3:Ce闪烁探测器凭借优良响应性能逐渐在中子测井领域推行。基于蒙特卡洛方法,对比分析了LaBr_3:Ce、NaI和BGO探测器对不同能量γ射线的沉积谱,并建立地层测井模型,采用D-T脉冲中子源和LaBr_3:Ce探测器对H、O、C、Fe等地壳元素γ特征能谱进行分析,设置4组晶体尺寸观测探测效率的变化。模拟结果表明:LaBr_3:Ce和BGO探测器能量响应明显优于NaI探测器,LaBr_3:Ce特征峰相对探测效率最高,因此进行常见地层元素分析时选择LaBr_3:Ce晶体。
With the development of formation element logging, it is one of the key points for technicians to improve the resolution of detectors in the probe. In recent years, the LaBr3:Ce scintillation detector has been gradually implemented in the field of neutron logging with excellent response performance. Based on the Monte Carlo method, the sedimentary energy spectra of LaBr3:Ce and NaI detectors are compared and analyzed. The formation logging model is established. The energy spectra of hydrogen H and Fe are observed by D-T pulse neutron source and two kinds of detectors. The simulation results show that the LaBr3:Ce detector has higher calculation accuracy than the NaI detector when the interference of various formation elements is overlapped when measuring common formation elements. The LaBr3:Ce high resolution crystal is in the complex formation. The detection efficiency in elemental logging is higher.
作者
张然
杜颖
杨悦
ZHANG Ran;DU Ying;YANG Yue(East China University of Technology,Nanchang 330013,China;Engineering Research Center of Nuclear Technology Application,Ministry of Education,Nanchang 330013,China)
出处
《能源研究与管理》
2019年第1期39-43,共5页
Energy Research and Management
