Effect of pair production on D-T induced gamma density measurement

YU Huawei; ZHANG Li; HOU Boran

doi:10.11889/j.0253-3219.2015.hjs.38.080502

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Effect of pair production on D-T induced gamma density measurement

更新时间：2021-03-03

- Effect of pair production on D-T induced gamma density measurement
- NUCLEAR TECHNIQUES Vol. 38, Issue 8, Article number: 080502(2015)
- 作者机构：
  
  1. 中国石油大学华东
  2. 地球科学与技术学院,青岛,266580
  3. 山东科技大学资源与土木工程系,泰安,271019
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.080502
  CLC：
- Published：13 August 2015
- 稿件说明：
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YU Huawei, ZHANG Li, HOU Boran. Effect of pair production on D-T induced gamma density measurement[J]. Nuclear techniques, 2015, 38(8): 080502
DOI：

YU Huawei, ZHANG Li, HOU Boran. Effect of pair production on D-T induced gamma density measurement[J]. Nuclear techniques, 2015, 38(8): 080502 DOI： 10.11889/j.0253-3219.2015.hjs.38.080502.

摘要

为研究电子对效应对D-T可控中子源地层密度测量精度的影响，本文首先分析传统的化学源密度测井原理，其次研究中子次生γ射线发生电子对效应与康普顿散射的质量衰减系数差异，并使用蒙特卡罗模拟方法研究传统密度测井和中子次生源密度测量精度，计算其误差大小、分析误差来源和提出校正方法。结果表明，密度测井主要利用γ射线的康普顿散射，当使用中子次生的高能γ射线测量地层密度时，其精度比化学源方法低，这种误差主要是由于高能γ射线的电子对效应引起，最大可以达到传统方法的2.7倍；电子对效应对于地层岩性比较敏感，如果对衰减的γ信号进行岩性校正，则可以提高密度测量的精度。

Abstract

Background: The D-T controllable neutron source is used to replace the chemical gamma source to measure the formation density in oil exploration. Purpose: The paper aims to study the effect of pair production on density measurement accuracy using the D-T neutron induced gamma ray. Methods: Firstly

the theory of traditional chemical source density logging method is analyzed

and the difference of the mass attenuation coefficient between Compton scattering and pair production is compared. In addition

the measurement accuracies of both traditional density log and neutron induced gamma density log are studied using Monte Carlo simulation method. And then the source of error and its correction are analyzed. Results & Conclusion: The measurement accuracy of neutron induced gamma density is worse than the traditional density log

the reason is that the contribution of gamma comes from not only the Campton scattering

which is employed in traditional density log

but also pair production. Moreover

the pair production of gamma ray is sensitive to the formation lithology

and the measurement accuracy could be increased if the lithology correction was added. Abstract

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