可控中子源核测井中γ射线时间和空间分布特性的模拟计算  

Time and Spatial Distributions ofγ-Rays in Nuclear Logging Using Controllable Neutron Source

作　　者：岳爱忠 王树声 陈海铮 张清民 邓邦杰 孙培伟[2,3] 马骞 何彪 何绪新 高可庆 吕金戈 赵媛媛[3] 张晓蕾 王虎 YUE Ai-zhong;WANG Shu-sheng;CHEN Hai-zheng;ZHANG Qing-min;DENG Bang-jie;SUN Pei-wei;MA Qian;HE Biao;HE Xu-xin;GAO Ke-qing;LYU Jin-ge;ZHAO Yuan-yuan;ZHANG Xiao-lei;WANG Hu(Technical Center,China Petroleum Logging Co.,Ltd.,Xi’an 710077,China;School of Nuclear Scienceand Technology,Xi’an Jiaotong University,Xi’an 710049,China;National Virtual Simulation ExperimentalTeaching Center for Nuclear and Fossil-Fired Power Plant System,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]中国石油集团测井有限公司技术中心,西安710077 [2]西安交通大学核科学与技术学院,西安710049 [3]西安交通大学核电厂与火电厂系统国家级虚拟仿真实验教学中心,西安710049

出　　处：《现代应用物理》2020年第2期90-99,共10页Modern Applied Physics

基　　金：“十三五”国家科技重大专项大型油气田及煤层气开发项目(2017ZX05019);多维高精度成像测井系列课题(2017ZX05019001)。

摘　　要：针对用伴随α粒子技术核测井的应用需求,为探索通过时间信息反映空间信息实现定域测井的可行性,应用蒙特卡罗数值模拟工具包Geant4,模拟了可控中子源发射的快中子在地层中的输运过程。通过记录中子与地层核素反应产生γ射线的时间及位置信息,获得了γ射线的时间和空间分布特性,并通过分析射线的时空特性,研究了γ射线产生时间与位置之间的相关性。结果表明,在中子发射角为30°~90°内,非弹性散射γ射线产生时间和径向距离之间呈现较好的线性关系,可以根据时间信息获取空间信息,从而有望实现定域测井。To explore the feasibility of usingα-associated neutrons to realize localized logging with time distribution reflecting spatial distribution,the interaction of fast neutrons generated by a controllable neutron source with formation is simulated by Monte Carlo numerical simulation toolkit Geant4.By recording the time and location information of the radiation produced by the neutron reaction with the formation nuclide,the time and spatial distribution characteristics ofγ-rays in nuclear logging using a controllable neutron source are obtained,and the correlation between the time and the location information is studied by inferring spatial information from time information.The results show that the location and the time distributions for the inelastic scatteringγ-rays are somehow linearly correlated with the neutron emission angle ranging from 30°to 90°,and the spatial information can be obtained from time information for possible localized logging.

关 键 词：伴随α粒子 可控中子源 核测井 时间分布 空间分布 

分 类 号：P631.8[天文地球—地质矿产勘探]