改进的深部煤层CO_(2)地质封存潜力评价方法——以沁水盆地郑庄区块3^(#)煤层为例  

Modified assessment method of CO_(2) geologic storage capacity in deep coal and its application in the Zhengzhuang Block,Qinshui Basin

作　　者：韩思杰[1,2] 桑树勋[1,2,3,4] 段飘飘[3,4] 徐昂 张金超 向文鑫 HAN Sijie;SANG Shuxun;DUAN Piaopiao;XU Ang;ZHANG Jinchao;XIANG Wenxin(Jiangsu Key Laboratory of Coal-based Greenhous Gas Control and Utilization,China University of Mining and Technology,Xuzhou 221008,China;Carbon Neutrality Institute,China University of Mining and Technology,Xuzhou 221008,China;Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education,China University of Mining&Technology,Xuzhou 221008,China;School of Resources and Earth Sciences,China University of Mining&Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学,江苏省煤基温室气体减排与资源化利用重点实验室,江苏徐州221008 [2]中国矿业大学碳中和研究院,江苏徐州221008 [3]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 [4]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《中国矿业大学学报》2023年第4期772-788,共17页Journal of China University of Mining & Technology

基　　金：国家自然科学基金碳中和专项项目(42141012);国家自然科学基金青年项目(42102207);江苏省煤基温室气体减排与资源化利用重点实验室重大自主研究项目(2020ZDZZ01C);鹏程尚学教育金(PCSX202203)。

摘　　要：煤层CO_(2)地质封存作为CCUS(Carbon Capture,Utilization and Storage,碳捕集、利用与封存)的重要组成部分,是短期内降低大气CO_(2)浓度的有效手段之一.本次研究以郑庄区块3#煤为例,开展不同温度条件煤岩CO_(2)等温吸附试验,建立了改进的煤层CO_(2)封存容量评价模型,分析了不同埋深条件下吸附封存量与游离量之和的变化规律与CO_(2)吸附机理,计算了沁水盆地郑庄区块3#煤CO_(2)理论封存容量和有效封存量.研究结果表明:CZ煤和SH煤不同温度下的CO_(2)吸附能力分别为1.58~2.47 mmol/g和1.51~2.38 mmol/g;CZ煤和SH煤CO_(2)的改进计算封存量(吸附+游离)随埋深呈先增后减的变化,最大值分别为2.71 mmol/g和2.80 mmol/g,2000 m煤储层条件下,二者改进计算封存量仍有最大值的76%和67%,表明深部煤层仍具有较大封存潜力;埋深剖面上CO_(2)吸附状态具有三分特点:分别为低密度表面覆盖式吸附,高密度微孔填充式吸附和高密度表面覆盖式吸附;郑庄区块3#煤层CO_(2)理论封存容量为428.7 Mt,气态-类气态超临界区和类液态超临界区煤层分别为277.91 Mt和150.79 Mt;区块总的有效封存容量为340.59 Mt,两分区的有效封存容量分别为250.12 Mt和90.47 Mt.建议优先考虑在高渗透率与保存条件良好的煤层发育区域实施CO_(2)-ECBM工程.As an important part of CCUS(carbon capture,utilization and storage),CO_(2)geologic storage in deep coal seams has been proposed as a method to reduce CO_(2)emissions into the atmosphere and achieve carbon neutrality in the immediate future.This study,taking No.3 coal in the Zhengzhuang Block as an example,was based on the CO_(2)adsorption isotherms experiments at various temperatures.A modified assessment method of CO_(2)geologic storage capacity was established,the curves of CO_(2)storage capacity in coals at depth profile in the Zhengzhuang Block were analyzed,CO_(2)adsorption mechanisms at different depths are presented,and the theoretical and effective CO_(2)storage capacity of No.3 coal in Zhengzhuang Block,Qinshui Basin was estimated.The results show that:The supercritical Dubinin-Radushkevich(D-R)model for CO_(2)adsorption data of CZ and SH coals has a high fitting accuracy.Adsorption capacities of the moisture-equilibrated coals at different temperatures ranged from 1.58 to 2.47 mmol/g and from 1.51 to 2.38 mmol/g,respectively.The curves of the modified calculated CO_(2)storage capacity per 1 g coal(CO_(2)-SCC)combined adsorbed and free CO_(2)of CZ and SH coals presented maximum values(2.71 mmol/g and 2.80 mmol/g)near 250m in the Zhengzhuang Block.At the depth of 2000 m,the CO_(2)-SCCs of CZ and SH coals still maintained 76%and 67%of their own maximum values,suggesting that the deep coal also has a promising CO_(2)geologic storage capacity.In depth profiles,the CO_(2)adsorption behavior can be subdivided into three states:a)surface coverage adsorption at low density,b)micropore filling adsorption at high density and c)surface coverage adsorption at high density.The theoretical CO_(2)storage capacity of No.3 coal seam in Zhengzhuang Block is 428.7 Mt,and they in gas and gas-like supercritical zone,and liquid-like supercritical zone are 277.91 Mt and 150.79 Mt respectively.The effective CO_(2)storage capacity in study area is 340.59 Mt and they in above areas are 250.12 Mt and 90.47 Mt,respectively.It is s

关 键 词：CO_(2)地质封存 改进的评价方法 深部煤层 吸附机理 储层条件 封存地质模型 

分 类 号：P618.11[天文地球—矿床学]