Application of low-field nuclear magnetic resonance technology in coal petrographic pore structure

Rahila·Abduwahit; Fengyun MA; Xiang ZHANG; Jingmei LIU; Mei ZHONG; Xin ZHAO

doi:10.11889/j.0253-3219.2017.hjs.40.120501

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Application of low-field nuclear magnetic resonance technology in coal petrographic pore structure

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

- Application of low-field nuclear magnetic resonance technology in coal petrographic pore structure
- NUCLEAR TECHNIQUES Vol. 40, Issue 12, Article number: 120501(2017)
- 作者机构：
  
  新疆维吾尔自治区煤炭清洁转化与化工过程重点实验室新疆大学化学化工学院乌鲁木齐 830046
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China -Xinjiang Joint Fund;Xinjiang University Scientific Research Project
- DOI：10.11889/j.0253-3219.2017.hjs.40.120501
  CLC： TQ533.9
- Received：21 April 2017，
  
  Revised：05 June 2017，
  
  Published：10 December 2017
- 稿件说明：
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Rahila·Abduwahit, Fengyun MA, Xiang ZHANG, et al. Application of low-field nuclear magnetic resonance technology in coal petrographic pore structure[J]. Nuclear techniques, 2017, 40(12): 120501
DOI：

Rahila·Abduwahit, Fengyun MA, Xiang ZHANG, et al. Application of low-field nuclear magnetic resonance technology in coal petrographic pore structure[J]. Nuclear techniques, 2017, 40(12): 120501 DOI： 10.11889/j.0253-3219.2017.hjs.40.120501.

摘要

用自旋-自旋弛豫（

）反演谱研究了哈萨克斯坦（Kazakhstan，KZ）、新疆伊吾县（Yiwu county，YW）、新疆白石湖（Baishi lake，BS）及新疆东坝区（Dongba district，DB）烟煤在饱水前后与饱锰后的岩相结构差异以及孔隙中流体的分布状况。结果表明，各煤样在饱水前，其质子弛豫信号均以束缚水为主，而饱水后，均出现自由水弛豫信号，且后三个煤样的束缚水信号强度明显增强；哈国煤样的自由流体饱和度最大，束缚流体饱和度最小，意味着其含油饱和度最大，是后三个煤样的4-6倍；哈国煤样的孔隙度相对最大，而伊吾县煤样相对最小；经过饱水处理，四个煤样的微孔数量均有所减少，而后三个煤样的小孔数量显著增加；哈国煤样的渗透率高达22.87%，为后三个煤样的3-20倍。这显然与其孔隙度和孔径差异相关，也是不同地域成煤地质环境差异和发育程度不同的反映。

Abstract

Background

Low-field nuclear magnetic resonance technology

with the advantages of a rapid detection process and no damage to sample

has been widely used in the field of oil exploration

food preservation

building materials.

Purpose

The aim of this work is to study the pore structure of the coal samples in different areas and the saturation of the fluid in the pores

which reflects the difference in the lithofacies structure and the distribution of the fluid in the pores.

Methods

The porosity

permeability

and fluid saturation of the coal samples before and after saturation of water and manganese were measured by low-field nuclear magnetic resonance.

Results and Conclusion

Results show that before saturation the proton relaxation signal of coal samples is dominated by irreducible water

and after saturation the signal of free water in all coal samples appear

and the signal of irreducible water of the coal samples in Yiwu county

Baishi lake and Dongha district are stronger than that before saturation. The saturation of free fluid of samples in Kazakhstan is the highest and that of irreducible water is the lowest. The oil saturation of samples in Kazakhstan is the highest

which is 4-6 times of that in Yiwu county

Baishi lake and Dongba district; the porosity of Kazakhstan coal sample is relatively large and the porosity of Yiwu county is relatively small; after saturation the number of micropores in coal samples of Kazakhstan

Yiwu county

Dongba district and Baishi lake are reduced

and the number of small holes in Yiwu county

Dongba district and Baishi lake coal samples is much higher than that before saturation; the penetration rate of Kazakhstan coal samples is 3-20 times of that of domestic coal samples

which is related to the difference in porosity and pore size of each sample

and is also a reflection of the geological environment and the degree of development.

关键词

Keywords

references

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