摘要
“双碳”目标是事关中华民族永续发展和构建人类命运共同体的重大决策。探索大规模、低成本、低能耗的CO_(2)浅层地质封存技术,对促进我国煤炭工业绿色低碳化发展、实现“双碳”目标具有重要意义。甘肃窑街矿区天然CO_(2)气藏埋藏浅、赋存量大,属于典型的CO_(2)浅层地质封存区,且其长期封存于浅层直至因受采动干扰才发生突出泄露。详细剖析该含煤岩系CO_(2)突出案例,对实现CO_(2)浅层地质封存具有重要的启示和借鉴。据此,开展了窑街矿区典型CO_(2)突出事故分布特征及潜在规律研究,结合突出事故与地质特征的关联性分析,揭示了窑街矿区海石湾井田和三矿井田可实现CO_(2)长期封存地质机制。在此基础上,基于窑街矿区CO_(2)富集构造地质特点,分析了后续开展浅层CO_(2)地质封存的若干启示。研究表明:①F19深大断裂及其分支断裂和其他次级断裂在天然CO_(2)气藏成藏过程中起到了导气断裂、储气断裂和封气断裂的功能,开采过程中破坏了CO_(2)积聚区的应力平衡和封闭条件是造成CO_(2)突出的根本原因;②海石湾井田为压扭性断层以及煤体基质吸附膨胀-化学反应协同侧向封闭,油页岩盖层垂向封闭的CO_(2)立体式封闭构造体系;三矿井田为压扭性断层侧向封闭,铝质泥岩、油页岩砂岩互层地质盖层垂向封闭,为实现CO_(2)富集封闭形成了良好的地层组合配置模式;③密闭的地质组合盖层是保障浅层CO_(2)安全封存的先决条件,探索地质盖层密闭性问题,将有助于发展生态脆弱区的煤炭减损开采与浅层采空区CO_(2)封存一体化技术。研究立足于窑街矿区含煤岩系CO_(2)突出事件,通过对CO_(2)浅层地质封存可行性探索,以期为开展CO_(2)浅层地质封存提供借鉴思路。
The“dual carbon”goal is a great decision concerning the sustainable development of Chinese nation and the building of a community with a shared future for mankind.The exploration of large⁃scale,low⁃cost,low⁃waste CO_(2)shallow geological storage technology is of great significance for promoting the green and low⁃carbon development of coal industry of China as well as realizing the goal of“dual carbon”.The natural CO_(2)gas reservoir in Yaojie mining area in Gansu province is a typical CO_(2)shallow geological sequestration area with shallow burial depth and large stor⁃age scale.It has been stored in shallow layer for a long time until mining disturbance happens,a detailed analysis of this case can provide important implications and references for realizing CO_(2)shallow geological storage.Based on this,the distribution characteristics and potential laws of typical CO_(2)outburst accidents in Yaojie Mining area are studied.Combined with the correlations between outburst accidents and geological characteristics,the CO_(2)geological sequestration mechanism of Haishiwan and Sankuang mine fields in Yaojie Mining area is revealed.Furthermore,based on the CO_(2)enrichment geological mechanism in Yaojie mining area,some implications for the subsequent development of shallow CO_(2)geological sequestration are analyzed.It shows:①The deep and large F19 faults and its branches as well as secondary faults play the functions of leakage,storage and sealing fault in the formation of the natural CO_(2)gas reservoir.The CO_(2)outbursts are caused because the stress equilibrium and sealing condition of CO_(2)accumulation zone are destroyed in the process of mining.②In Haishiwan well field,it is a CO_(2)stereoscopic sealing structural system with laterally sealed by the F19 compression⁃torsion faults,the adsorption expansion of coal matrix,and chemical reac⁃tion,and vertically sealed by the oil shale caprock.In Sankuang mine field,the CO_(2)is also laterally sealed by compres⁃sion⁃torsion faults,and ver
作者
王双明
寇海波
申艳军
刘浪
顾霖骏
陈兴
李子一
WANG Shuangming;KOU Haibo;SHEN Yanjun;LIU Lang;GU Linjun;CHEN Xing;LI Ziyi(Geological Research Institute for Coal Green Mining,Xi’an University of Science and Technology,Xi’an 710054,China;Shaanxi Provincial Key Labora-tory of Geological Support for Coal Green Exploitation,Xi’an 710054,China;College of Geology and Environment,Xi’an University of Science and Tech-nology,Xi’an 710054,China;College of Science,Xi’an University of Science and Technology,Xi’an 710054,China;Department of Geological Engi-neering and Geomatics,Chang’an University,Xi’an 710054,China)
出处
《绿色矿山》
2023年第1期33-47,共15页
Journal of Mine
基金
陕西省煤炭绿色开发地质保障重点实验室重点基金资助项目(DZBZ2021Z-05)
中国博士后科学基金面上资助项目(2022MD723820)
陕西省博士后科研基金资助项目(2023BSHYDZZ158)。
