Analysis of factors affecting the sensitivity of neutron porosity logging

Huawei YU; Yue ZHOU; Xianghong CHEN; Zhigang WANG

doi:10.11889/j.0253-3219.2018.hjs.41.020502

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Analysis of factors affecting the sensitivity of neutron porosity logging

NUCLEAR PHYSICS, INTERDISCIPLINARY RESEARCH | 更新时间：2021-05-19

- Analysis of factors affecting the sensitivity of neutron porosity logging
- NUCLEAR TECHNIQUES Vol. 41, Issue 2, Article number: 020502(2018)
- 作者机构：
  
  1.中国石油大学(华东) 青岛 266580
  2.海洋国家实验室海洋矿产资源评价与探测技术功能实验室青岛 266071
  3.长庆油田分公司第六采气厂西安 710000
- 作者简介：
- 基金信息：
  
  the National Key Research and Development Program of China;Fundamental Research Funds for the Central Universities;Fundamental Research Funds for the Central Universities;Teaching Reform Project for China University of Petroleum;National Science and Technology Major Project
- DOI：10.11889/j.0253-3219.2018.hjs.41.020502
  CLC： P631.81
- Received：19 October 2017，
  
  Revised：29 November 2017，
  
  Published：10 February 2018
- 稿件说明：
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Huawei YU, Yue ZHOU, Xianghong CHEN, et al. Analysis of factors affecting the sensitivity of neutron porosity logging[J]. Nuclear techniques, 2018, 41(2): 020502
DOI：

Huawei YU, Yue ZHOU, Xianghong CHEN, et al. Analysis of factors affecting the sensitivity of neutron porosity logging[J]. Nuclear techniques, 2018, 41(2): 020502 DOI： 10.11889/j.0253-3219.2018.hjs.41.020502.

摘要

可控源替代中子孔隙度测井中的同位素中子源已经成为石油勘探发展的必然趋势。为了提高中子孔隙度测井中可控源替代同位素中子源的兼容性与测量精度，本文针对影响地层孔隙度灵敏度的因素进行分析。首先，根据中子孔隙度响应的理论公式，推导出地层孔隙度灵敏度的响应方程，然后对其进行分析并得出影响灵敏度的各种因素。结果表明，地层中的中子减速长度对地层灵敏度变化起到主要影响作用，另外减速长度受到了源类型及能量、孔隙度、岩性、密度等因素的影响，其中中子能量和岩石密度是影响灵敏度变化的主要因素。本研究为今后可控源中子孔隙度测井的研究提供了理论依据。

Abstract

Background

It has become an inevitable trend to use controlled source instead of isotope neutron source in neutron porosity logging for petroleum exploration

and the availability of measurement results is determined by formation sensitivity

which is required to be of a certain standard.

Purpose

This study aims to improve the compatibility and measurement accuracy of the controlled source for neutron porosity logging.

Methods

First of all

the response equation of formational porosity sensitivity is derviated according to the theoretical formula of neutron porosity logging's response

then the Schlumberger Nuclear Parameter (SNUPAR) program is applied to analysis of its adaptability and factors affecting the sensitivity of neutron porosity logging.

Results

Computaional results show that the deceleration length of neutron is the main role to the change of sensitivity

and the deceleration length is affected by source type and its energy

porosity

lithology

and density. And the neutron energy and rock density are the main factors that affect the sensitivity change.

Conclusion

This study provides a theoretical basis for the further study of controlled source neutron porosity logging.

关键词

Keywords

references

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