Geological Research Institute for Coal Green Mining,Xi’an University of Science and Technology
Shaanxi Provincial Key Labora⁃tory of Geological Support for Coal Green Exploitation
College of Geology and Environment,Xi’an University of Science and Tech⁃nology
College of Science,Xi’an University of Science and Technology
Department of Geological Engi⁃neering and Geomatics,Chang’an University

“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CO2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CO2气藏埋藏浅、赋存量大,属于典型的CO2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CO2突出案例,对实现CO2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CO2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CO2长期封存地质机制。在此基础上,基于窑街矿区CO2富集构造地质特点,分析了后续开展浅层CO2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CO2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CO2积聚区的应力平衡和封闭条件是造成CO2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CO2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CO2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CO2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CO2封存一体化技术。研究立足于窑街矿区含煤岩系CO2突出事件,通过对CO2浅层地质封存可行性探索,以期为开展CO2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:① The deep and large F 19 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.② In Haishiwan well field,it is a CO 2 stereoscopic sealing structural system with laterally sealed by the F 19 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 vertically sealed by a caprock of interbedded aluminous mudstone and oil shale sandstone.③ The sealing geological composite caprock is the prerequisite to ensure the safe storage of shallow CO 2.Exploring the sealing mechanism of geological caprock will be helpful to develop the integrated technology of coal dam⁃age reduction mining and CO 2 storage in shallow goaf in vulnerable ecological region.Based on the CO 2 outburst acci⁃dents of coal⁃bearing rock series in Yaojie mining area,the study provides a reference for CO 2 shallow geological stor⁃age through preliminary exploration of the feasibility of CO 2 shallow geological storage.

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)

王双明,寇海波,申艳军,等.含煤岩系 CO 2 突出对浅层 CO 2 地质封存的启示[J].绿色矿山,2023,1(1):33-47.

WANG Shuangming,KOU Haibo,SHEN Yanjun,et al.Implications of CO 2 outburst from coal⁃bearing rock series for the CO 2 geological sequestration under shallow layers[J].Journal of Green Mine,2023,1(1):33-47.