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煤基CO2地质封存对顶板裂缝导流能力影响实验
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Journal:煤田地质与勘探

Abstract:煤基CO2 地质封存是温室气体减排的重要方式,但也存在地下CO2 泄露的安全风险。为了评估煤基CO2 地质封存的安全性,采集了沁水盆地南部胡底矿3 号煤顶板泥质粉砂岩样品,模拟实验研究“CO2-H2O-岩”反应中柱状试样人工裂缝形貌、全岩矿物组成与CO2 导流能力变化。结果表明:方解石脉溶蚀、次生矿物充填与外部有效应力共同影响试样裂缝导流能力。原始渗透率为0.016×10-3 μm2 的低渗试样,方解石脉溶蚀导致实验前期渗透率升高;随着反应进行,有效应力主导下裂缝闭合,渗透率呈“先升后降”变化。原始渗透率为3.785×10-3 μm2的高渗试样,H2CO3不断溶蚀裂缝壁面长石等矿物,并产生高岭石等次生矿物混合充填于裂缝中,使渗透率持续降低。煤基CO2 地质封存过程中,较高的注入压力导致顶板产生人工裂缝;CO2 注入施工结束后,次生矿物充填及有效应力增大使裂缝导流能力快速下降,因此煤中封存CO2 沿顶板裂缝长期泄露的风险较低。

First Author:朱世良

Co-author:邵丽伟

Indexed by:Journal paper

Correspondence Author:周效志

Volume:49

Translation or Not:no

Date of Publication:2021-01-22

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School/Department:School of Resources and Geosciences

Administrative Position:Deputy Director of the Department

Education Level:With Certificate of Graduation for Doctorate Study

Business Address:CBM Development Laboratory in Wenchang Campus of China University of Mining and Technology

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Contact Information:cumtzxz@cumt.edu.cn

Degree:Doctor

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Academic Titles:Deputy director of Jiangsu low carbon society

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Alma Mater:China University of Mining and Technology

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Honors and Titles:

中国自动化学会技术发明二等奖  2023-11-01

领跑者5000中国精品科技期刊顶尖学术论文  2022-12-29

2021年度中国地质学会地质类工程专业优秀本科毕业设计指导教师  2022-08-25

贵州省科技进步三等奖  2007-11-07

煤炭工业协会科技进步二等奖  2013-03-06

贵州省科技进步二等奖  2020-07-01

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