Effect of density measurement on D-D induced gamma counting

Li ZHANG; Huawei YU

doi:10.11889/j.0253-3219.2016.hjs.39.030502

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Effect of density measurement on D-D induced gamma counting

更新时间：2021-05-24

- Effect of density measurement on D-D induced gamma counting
- NUCLEAR TECHNIQUES Vol. 39, Issue 3, Article number: 030502(2016)
- 作者机构：
  
  1.山东科技大学资源与土木工程系泰安 271019;
  2.中国石油大学华东地球科学与技术学院青岛 266580
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2016.hjs.39.030502
  CLC： TL99;TE19
- Received：11 January 2016，
  
  Accepted：2016-02-15，
  
  Published：25 March 2016
- 稿件说明：
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Li ZHANG, Huawei YU. Effect of density measurement on D-D induced gamma counting[J]. Nuclear techniques, 2016, 39(3): 030502
DOI：

Li ZHANG, Huawei YU. Effect of density measurement on D-D induced gamma counting[J]. Nuclear techniques, 2016, 39(3): 030502 DOI： 10.11889/j.0253-3219.2016.hjs.39.030502.

摘要

为研究D-D源密度测量过程中俘获γ计数对密度测量的影响

本文首先分析D-D源密度测量的原理

其次研究D-D源与地层反应产生的γ射线类型

并采用蒙特卡罗模拟方法对比分析了D-D源和D-T源密度测量过程中次生γ强度高低。结果表明

D-D源密度测量过程中次生γ以俘获γ为主;尽管D-D源的中子产额远低于D-T源

但在源距大于50 cm后低孔隙地层中D-D源俘获γ计数高于D-T源非弹γ计数;此外

高孔隙地层中D-D源俘获γ计数也可以通过调整源距大小满足密度测量的要求。因此

使用D-D源测量的次生γ计数能够满足密度测量的统计精度要求。

Abstract

Background:

The controllable neutron source is used to replace the chemical gamma source to measure the formation density in oil exploration.

Purpose:

The effect of capture gamma counting on density is studied in the process of D-D source density measurement.

Methods:

Firstly

the principle of D-D source density measurement is analyzed

and the type of gamma-ray source in the process of D-D source and the formation is studied. In addition

the intensity of induced gamma between D-D and D-T source density measurement is compared using Monte Carlo simulation method.

Results & Conclusion:

The capture gamma takes a large proportion on D-D induced gamma density measurement. Although neutron yield of D-D source is far lower than that of D-T source

the capture gamma counting of D-D source is higher than inelastic gamma counting of D-T source with the distance from the source more than 50 cm in the low porosity formation. In addition

the capture gamma counting can be obtained by adjusting the source size to meet the requirements of density measurement in high porosity formation. Therefore

the counting of D-D induced gamma can meet the statistical accuracy of the density measurement.

关键词

Keywords

references

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