CO<sub>2</sub>地质埋藏深度对高阶煤孔隙结构的影响

刘长江; 张琨; 宋璠

doi:10.3969/j.issn.1001-1986.2018.05.005

CO₂地质埋藏深度对高阶煤孔隙结构的影响

刘长江¹,
张琨^2,3,
宋璠¹

1. 中国石油大学(华东)地球科学与技术学院，山东青岛 266580;
2. 中国矿业大学煤层气资源与成藏过程教育部重点实验室，江苏徐州 221008;
3. 中国矿业大学资源与地球科学学院，江苏徐州 221116

基金项目:

国家自然科学基金项目（41330638，41302125）；山东省自然科学基金项目（ZR2018MD009）；中央高校基本科研业务费专项资金项目（18CX02056A）

详细信息

作者简介:
刘长江,1981年生,男,四川宜宾人,博士,副教授,从事煤与煤层气地球化学研究.E-mail:changjliu@126.com

中图分类号: P618.11
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出版历程
- 收稿日期: 2018-04-24
- 发布日期: 2018-10-24

Influences of burial depth on pore structure of high-rank coal during the CO₂ storage process

1. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, China;
2. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China;
3. School of Resources and Earth Science, China University of Mining and Technology, Xuzhou 221116, China

Funds:

National Natural Science Foundation of China(41330638, 41302125)

摘要

摘要: 高阶煤中的CO₂地质埋藏具有存储CO₂和提高煤层气采收率的双重意义。通过压汞测试和低温液氮吸附实验对经过CO₂地质埋藏模拟实验处理前后的煤样品进行分析测试，探讨了不同埋藏深度下煤中孔隙演化的特征与机理。研究表明：煤的真密度、视密度、孔隙体积、煤基质体积变化、有机质膨胀与收缩等参数均表现出不同的演化特征；埋藏过程中温度压力的增大对H₂O–CO₂–煤的地球化学反应效应的影响并非线性，而是存在一个对孔隙特别是微孔孔容和比表面积改造最大的深度范围，该深度将使得高阶煤孔隙结构得到最佳的改造效果，从而进一步更有利CO₂的地质埋藏和提高煤层气的采收率。
- CO₂地质埋藏 /
- 高阶煤 /
- 孔隙结构 /
- 埋藏深度
Abstract: CO₂ storage into deep high rank coal has the positive effect on enhancing the CH₄ recovery and sealing the CO₂. The samples before and after the CO₂ storage simulation experiments were analyzed by Mercury porosemitry and low temperature liquid adsorption, the pore structure evolution characteristics of CO₂ storage in different burial depth was discussed. The results show that the true density, bulk density, pore volume, coal matrix volume changes, swelling and contraction of coal are all suffering from different evolution features. The influence of depth on geochemical reaction is not a linear relationship. A maximum depth that has significant influences on micropores and specific area exists. This burial depth is best for the reconstruction of pore systems in coal and more favorable for CH₄ recovery and CO₂ geological storage.
- CO₂ geological storage /
- high-rank coal /
- pore structure /
- burial depth

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