Formation density affects and corrections in pulsed neutron porosity logging

Hu WANG; Wensheng WU; Hongwei WANG; Liwei REN; Yunlong GE; Duo DONG; Ruigang WANG; Liuqiong HE

doi:10.11889/j.0253-3219.2018.hjs.41.080406

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Formation density affects and corrections in pulsed neutron porosity logging

NUCLEAR ELECTRONICS AND INSTRUMENTATION | 更新时间：2021-05-19

- Formation density affects and corrections in pulsed neutron porosity logging
- NUCLEAR TECHNIQUES Vol. 41, Issue 8, Article number: 080406(2018)
- 作者机构：
  
  1.油气资源与探测国家重点实验室中国石油大学(北京) 北京 102249
  2.中国石油集团测井有限公司大庆分公司大庆 163412
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2018.hjs.41.080406
  CLC： TL99;TE19
- Received：19 October 2017，
  
  Revised：21 March 2018，
  
  Published：2018-08
- 稿件说明：
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Hu WANG, Wensheng WU, Hongwei WANG, et al. Formation density affects and corrections in pulsed neutron porosity logging[J]. Nuclear techniques, 2018, 41(8): 080406
DOI：

Hu WANG, Wensheng WU, Hongwei WANG, et al. Formation density affects and corrections in pulsed neutron porosity logging[J]. Nuclear techniques, 2018, 41(8): 080406 DOI： 10.11889/j.0253-3219.2018.hjs.41.080406.

摘要

在井下脉冲中子孔隙度测量中，岩性或地层密度对含氢指数测量的影响相对于化学源显著增强，地层的非弹性散射影响不可忽略，必须发展相应的校正方法以确保测量结果的准确性。在无限均匀介质中，对中子的减速长度与地层体积密度及含氢指数的关系进行了推导和数值模拟分析，得到经过地层体积密度校正后的计数率比值与地层含氢指数的相关性；继而对近、远探测器的计数率比值进行体积密度校正，提高了对地层孔隙度的灵敏度，显著降低了岩性和泥岩效应的影响。

Abstract

Background

The inelastic scattering reaction between neutron and formation element in pulsed neutron porosity logging can not be neglected. Compared to chemical source

the influences of lithology and density on the measurement of hydrogen index increase

so the measured apparent porosity may be affected.

Purpose

This study aims to investigate the formation density influence and corresponding correction method.

Methods

First of all

the relationship of slowing-down length of neutrons in the infinite homogeneous formation between bulk density and hydrogen index was deduced

and numerical simulation was performed. Then the correlation between the quotient of counting rate after correction of formation density and the hydrogen index of the formation was obtained. Finally

the quotients of far detector counting rate and near detector counting rate were used to correct the formation density

and the result of the experiment was analyzed.

Results

The relation between the bulk density corrected count ratio and hydrogen index was obtained

and the sensitiveness of pulsed neutron porosity logging got improved.

Conclusions

Correcting count ratio of near detector and far detector with bulk density by means of numerical simulation can reduce the influence of bulk density

enhance the detection sensitivity of porosity and reduce the influence of lithology and shale effect.

关键词

Keywords

references

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