Numerical simulation study of fast neutron cross section logging using D-T neutron source with long source distance detector

SONG Xiaoyu; WU Wensheng; ZHANG Haoyu; HE Lina; XIONG Shitao; FU Xinyue; WANG Gang

doi:10.3724/j.0253-3219.2025.hjs.48.240502

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Numerical simulation study of fast neutron cross section logging using D-T neutron source with long source distance detector

ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS | 更新时间：2025-11-27

- Numerical simulation study of fast neutron cross section logging using D-T neutron source with long source distance detector
- NUCLEAR TECHNIQUES Vol. 48, Issue 11, Article number: 110201(2025)
- 作者机构：
  
  1.（油气资源与工程全国重点实验室中国石油大学（北京）北京 102249）
  2.中国石油天然气股份有限公司长庆油田分公司第三采气厂鄂尔多斯 017300
  3.中国石油集团测井有限公司西安 710077
  4.中国石油长庆油田公司西安 710018
- 作者简介：
  
  SONG Xiaoyu, male, born in 1997, graduated from China University of Petroleum (Beijing) in 2021, doctoral student, focusing on neutron cross section logging
  WU Wensheng, E-mail: wwsheng@cup.edu.cn
- 基金信息：
- DOI：10.3724/j.0253-3219.2025.hjs.48.240502
  CLC： TL99;P631.8⁺17
- Received：08 December 2024，
  
  Revised：2025-02-19，
  
  Published：15 November 2025
- 稿件说明：
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宋孝雨,吴文圣,张浩宇等.基于长源距探测器的D-T中子源快中子截面测井数值模拟研究[J].核技术,2025,48(11):110201.

SONG Xiaoyu,WU Wensheng,ZHANG Haoyu,et al.Numerical simulation study of fast neutron cross section logging using D-T neutron source with long source distance detector[J].NUCLEAR TECHNIQUES,2025,48(11):110201.
宋孝雨,吴文圣,张浩宇等.基于长源距探测器的D-T中子源快中子截面测井数值模拟研究[J].核技术,2025,48(11):110201. DOI： 10.3724/j.0253-3219.2025.hjs.48.240502. CSTR： 32193.14.hjs.CN31-1342/TL.2025.48.240502.

SONG Xiaoyu,WU Wensheng,ZHANG Haoyu,et al.Numerical simulation study of fast neutron cross section logging using D-T neutron source with long source distance detector[J].NUCLEAR TECHNIQUES,2025,48(11):110201. DOI： 10.3724/j.0253-3219.2025.hjs.48.240502. CSTR： 32193.14.hjs.CN31-1342/TL.2025.48.240502.

摘要

快中子截面（Fast Neutron Cross Section，FNXS）测井在致密气藏评价与二氧化碳地质封存监测中发挥着重要作用，其测量精度与探测特性主要由长探测器的源距决定。基于实际多探测器脉冲中子测井仪器参数，采用蒙特卡罗数值模拟方法，研究了不同长源距选取对FNXS测量精度的影响。同时，参考斯伦贝谢脉冲星仪器，建立了三探测器脉冲中子测井仪器模型，并分析了源距分别为30 cm、60 cm和90 cm时的探测深度和纵向分辨率。研究结果表明：FNXS测量的最佳长源距范围为85~115 cm，并且随着源距的增大，探测深度逐渐增大，而纵向分辨率逐渐减小；当源距为90 cm时，对应的探测深度和纵向分辨率分别为22 cm和76.2 cm。本研究为进一步提高FNXS测量精度并优化仪器结构提供了理论支持与关键参数参考。

Abstract

Background

Fast neutron cross section (FNXS) logging plays a crucial role in evaluating tight gas reservoirs and monitoring carbon dioxide geological sequestration. The accuracy and detection characteristics of FNXS logging are primarily influenced by the source-to-detector distance of the long detector.

Purpose

This study aims to optimize the source-to-detector distance for the long detector in FNXS logging and analyze the impact of different source-to-detector distances on its detection characteristics.

Methods

Firstly

utilizing the actual parameters of a multi-detector pulsed neutron logging tool

a Monte Carlo numerical simulation method was employed to analyze the gamma response of gas layers at various source-to-detector distances. Then

based on FNXS measurement sensitivity and error analysis

the optimal range for the long detector's source-to-detector distance was determined. Finally

a three-detector pulsed neutron tool model

based on Schlumberger's Pulsar tool

was constructed to analyze the detection depth and vertical resolution at source-to-detector distances of 30 cm

60 cm

and 90 cm.

Results

Calculation results indicate that the optimal range for the long detector's source-to-detector distance in FNXS logging is between 85 cm and 115 cm. As the source-to-detector distance increases

the detection depth increases while the vertical resolution decreases. At a source-to-detector distance of 90 cm

the detection depth and vertical resolution are 22 cm and 76.2 cm

respectively. Moreover

the increased detection depth of the long detector makes it suitable for measurements in cased holes but unsuitable for thin-layer measurements.

Conclusions

Simulation results of this study provide theoretical support and key parameter references for enhancing FNXS measurement accuracy and optimizing instrument design. The optimal source-to-detector distance range of 85~115 cm balances measurement sensitivity and statistical error

while the trade-off between detection depth and vertical resolution must be considered based on specific application requirements.

关键词

Keywords

references

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