脉冲中子地层元素测井仪优化设计中的蒙特卡罗模拟研究  

Study of Monte Carlo Simulation on Optimally Designing Pulsing Neutron Formation Element Logging Tool

作　　者：王树声[1,2,3] 肖立志[1] 岳爱忠[2,3] 程峰 郭用梅[2,3] 何绪新[2,3] 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油集团测井有限公司技术中心,陕西西安710077 [3]中国石油天然气集团公司测井重点实验室,陕西西安710077 [4]中国石油集团测井有限公司装备与销售分公司,陕西西安710077

出　　处：《原子能科学技术》2016年第8期1517-1523,共7页Atomic Energy Science and Technology

基　　金：863计划资助项目(2013AA064601);国家科技重大专项资助项目(2016ZX05019001)

摘　　要：采用蒙特卡罗方法研究了脉冲中子地层元素测井仪闪烁晶体材料、井眼屏蔽体厚度、硼套表面密度等设计参数对仪器测井响应的影响。结果表明:LaBr3晶体的测井响应特性优于BGO晶体;高矿化度盐水对测量结果影响很大,井眼屏蔽体厚度为1.2cm时,可屏蔽60%以上井眼γ射线;硼套中10 B表面密度达到0.065g/cm2时,可消除仪器外壳材料产生的俘获γ本底;俘获能谱的探测深度随孔隙度的增加而减小,非弹性散射能谱对不同孔隙度地层的探测深度基本一致,约为14cm。The effects of design parameters such as the scintillation crystal materials,the thickness of borehole shield and the surface density of boron sleeve on the logging response of the formation element logging tool were studied by using Monte Carlo method.The results show that LaBr3 detector has outstanding performance in logging response compared with BGO detector.Salt water with high salinity affects ultimatelythe measurement of the element concentrations.The borehole shield thickness of 1.2cm can shield more than 60% γ-ray from borehole.10 B surface density of 0.065g/cm2 can eliminate the captureγbackground from tool material.With the increase of formation porosity,the investigation depth of capture spectrum decreases.The investigation depth of inelastic spectrum is about 14 cm,which is almost identical among the formations with different porosities.

关 键 词：脉冲中子 地层元素测井 γ通量密度 

分 类 号：P631.817[天文地球—地质矿产勘探]