Monte Carlo simulation to key parameters of a compensated neutron logger  

作　　者：TUO Xianguo YANG Jianbo MU Keliang LI Zhe LONG Qiong 

机构地区：[1]Provincial Key Lab of Applied Nuclear Techniques in Geosciences, Chengdu University of Technology, Chengdu 610059, China [2]Chengdu University of Technology, Chengdu 610059, China

出　　处：《Nuclear Science and Techniques》2009年第6期359-362,共4页核技术（英文）

基　　金：Partially supported by National Key Technology R&D Program of China(2008BAK47B04);Innovation Method Work(2008IM040500);National Natural Science Foundation of China(40673058);Sichuan province Key Technology R&D Program(2008GZ0040, 2008GZ0197)

摘　　要：A compensated neutron logger (CNL) is designed by using Monte-Carlo simulation for lead shield thickness, near-to-far detector spacing range, source-to-detector spacing range, and detector's effective length. The calculated results indicate that the optimum conditions for CNL are 80-mm thick lead plus 1-cm thick LiOH shield in front of the near detector, 250 mm for the near-to-far detector distance (Δr), and the source-to-detector distance (r) of 90mm. Simultaneously, some conclusion also obtained here, near/far detector counting response ratio (R) increases with the effective length of detector, R increases with the porosity for oil and water sandstones, and the oil sandstone is a bit greater than water sandstone.A compensated neutron logger （CNL） is designed by using Monte-Carlo simulation for lead shield thickness, near-to-far detector spacing range, source-to-detector spacing range, and detector＇s effective length. The calculated results indicate that the optimum conditions for CNL are 80-ram thick lead plus 1-cm thick LiOH shield in front of the near detector, 250 mm for the near-to-far detector distance （Ar）, and the source-to-detector distance （r） of 90mm. Simultaneously, some conclusion also obtained here, near/far detector counting response ratio （R） increases with the effective length of detector, R increases with the porosity for oil and water sandstones, and the oil sandstone is a bit greater than water sandstone.

关 键 词：蒙特卡罗模拟 补偿中子 关键参数 记录器 屏蔽厚度 探测器 有效长度 油砂岩 

分 类 号：P631.817[天文地球—地质矿产勘探] O242.2[天文地球—地质学]