小口径γ能谱测井仪研制

焦仓文; 邓 明; 陆士立; 袁 明; 马艳芳

doi:10.11889/j.0253-3219.2015.hjs.38.040403

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小口径γ能谱测井仪研制

核电子学与仪器 | 更新时间：2021-03-03

- 小口径γ能谱测井仪研制
- Research and development of slim borehole gamma ray spectrometry logger
- 核技术 2015年38卷第4期文章编号：040403
- 作者机构：
  
  1. 中国地质大学北京
  2. 地球物理与信息技术学院,北京,100083
- 作者简介：
  
  [ "作者简介:焦仓文，男，1969年出生，1992年毕业于长春地质学院，高级工程师，现为在职博士生，研究领域为地球物理测井" ]
- 基金信息：
  
  国防预研基金(No.41603070203)资助()
- DOI：10.11889/j.0253-3219.2015.hjs.38.040403
  中图分类号：
- 纸质出版日期：2015-04-09
- 稿件说明：
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焦仓文, 邓明, 陆士立, 等. 小口径γ能谱测井仪研制[J]. 核技术, 2015,38(4):040403

JIAO Cangwen, DENG Ming, LU Shili, et al. Research and development of slim borehole gamma ray spectrometry logger[J]. Nuclear techniques, 2015, 38(4): 040403
焦仓文, 邓明, 陆士立, 等. 小口径γ能谱测井仪研制[J]. 核技术, 2015,38(4):040403 DOI： 10.11889/j.0253-3219.2015.hjs.38.040403.

JIAO Cangwen, DENG Ming, LU Shili, et al. Research and development of slim borehole gamma ray spectrometry logger[J]. Nuclear techniques, 2015, 38(4): 040403 DOI： 10.11889/j.0253-3219.2015.hjs.38.040403.

摘要

为实现在铀、钍混合型矿床上准确测定铀含量之目的，开发了直径45 mm的小口径自然γ能谱测井仪。该γ能谱仪采用闪烁晶体探测器锗酸铋(Bi3Ge4O12

BGO)，晶体为?30 mm×100 mm；为减小死时间，从系统角度提出旨在提高数据吞吐率的基于双端口RAM加双CPU结构的仪器设计方案。针对自动稳谱难题，软件上采用基于133Ba自稳参考源的实时四能窗稳谱算法；硬件上基于温度粗调辅以光电倍增管(Photomultiplier Tube

PMT)高压调节的思想，测井仪开机阶段根据测井环境温度设定PMT高压初值，测井过程中根据谱漂移程度实时微调高压，两者结合自动稳谱精度有大幅度提高，结合Pb-Sn组合屏蔽低能γ射线解决了高含量铀矿体强γ射线对测井仪自动稳谱系统干扰的难题。经放射性标准模型站对谱仪进行多模型标定、死时间修正、水和铁套管吸收系数修正等检测，以及对能谱仪野外实际测试结果对比，结果表明，该小口径自然γ能谱测井仪检查测井异常相对误差不大于10%。

Abstract

Background: γ spectrometry logging is one method for accurately computing uranium content in uranium-thorium mixed type deposit for slim borehole application. Purpose: The aim is to design slim borehole γ spectrometry logger N451 with ?30 mm×100 mm high detection efficiency Bi4Ge3O12 (BGO) scintillation detector

whose diameter and length are 45 mm and 1300 mm

respectively. Methods: By applying the configuration of dual-microprocessor plus dual port RAM to improving the data throughput rate

the aim of reducing dead time was achieved. As to auto-stabilization

by means of 4-window algorithm with 133Ba reference source

plus temperature-based coarse set while power on and fine tune Photomultiplier Tube (PMT) high voltage while logging

the auto-stabilization accuracy was considerably improved. Using Pb-Sn mask method

N451 overcomes the interference on auto-stabilization system from the high level uranium deposit low energy γ-ray. Results: After multiple saturated modules and 226Ra point source calibration and Fe as well as H2O coefficient correction

field logging was surveyed. Conclusion: The uranium content relative error was less than 10%. The slim borehole γ spectrometry logger is up to the specification. Abstract

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