第41卷 第2期 核 技 术 V ol.41, No.2 2018年2月 NUCLEAR TECHNIQUES February 2018
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国家自然科学基金(No.41674129)、国家重点研发计划(No.2016YFC0302900)、中央高校基本科研业务费(No.14CX02182A 、No.16CX02039A)、中
国石油大学教学改革项目(No.SY-A201405)、国家科技重大专项(No.2017ZX05009001)资助
第一作者：于华伟，男，1981年出生，2011年于中国石油大学（华东）获博士学位，研究领域为核测井新方法及蒙特卡罗模拟
收稿日期：2017-10-19，修回日期：2017-11-29
Supported by National Natural Science Foundation of China (No.41674129), the National Key Research and Development Program of China
(No.2016YFC0302900), Fundamental Research Funds for the Central Universities (No.14CX02182A, No.16CX02039A), Teaching Reform Project for
China University of Petroleum (No.SY-A201405), National Science and Technology Major Project (No.2017ZX05009001)
First author: YU Huawei, male, born in 1981, graduated from China University of Petroleum (Hua dong) with a doctoral degree in 2011, focusing on new
method for nuclear logging and MCNP
Received date: 2017-10-19, accepted date: 2017-11-29 020502-1
中子孔隙度测井灵敏度影响因素分析
于华伟1,2 周 悦1,2 陈翔鸿1,2 王志刚3
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）
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。
关键词 中子孔隙度测井，可控源，地层灵敏度，减速长度
中图分类号 P631.81
DOI: 10.11889/j.0253-3219.2018.hjs.41.020502
Analysis of factors affecting the sensitivity of neutron porosity logging
YU Huawei 1,2 ZHOU Yue 1,2 CHEN Xianghong 1,2 WANG Zhigang 3
1(China University of Petroleum (Hua dong ), Qingdao 266580, China )
2(Laboratory for Marine Mineral Resources , Qingdao National Laboratory for Marine Science and Technology , Qingdao 266071, China )
3(Changqing Oil Field Branch Sixth Gas Production Plant , Xi ’an 710000, China )
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.
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