引用本文:夏盈莉,许天福,杨志杰,封官宏,袁益龙,田海龙,等.深部储层中CO2沿断层泄漏量的影响因素[J].环境科学研究,2017,30(10):1533-1541.
XIA Yingli,XU Tianfu,YANG Zhijie,FENG Guanhong,YUAN Yilong,TIAN Hailong,et al.Factors Influencing Amount of CO2 Leakage through a Fault Zone in Deep Storage Aquifer[J].Reserrch of Environmental Science,2017,30(10):1533-1541.]
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深部储层中CO2沿断层泄漏量的影响因素
夏盈莉1,2, 许天福1,2, 杨志杰1,2, 封官宏1,2, 袁益龙1,2, 田海龙1,2
1.吉林大学环境与资源学院, 吉林 长春 130021 ;2.吉林大学地下水资源与环境教育部重点实验室, 吉林 长春 130021
摘要:
CGS(CO2地质储存)是CO2减排的重要手段之一,天然裂隙的存在则是CGS的潜在风险.CO2地质储存过程中储层上覆盖层及其浅部含水层是防止CO2泄漏的天然屏障,为了探究深部咸水层中CO2沿断层的泄漏过程并获得断层渗透率及储层中超临界CO2流体初始条件(初始饱和度、初始泄漏压力)对CO2沿断层泄漏速率和泄漏量的影响程度,依据鄂尔多斯CO2灌注工程示范区资料,使用多相、多组分溶质运移数值模拟软件TOUGH2建立了2D概念模型.结果表明,深部咸水层中的CO2在压力差和浓度差的作用下沿断层发生泄漏,到达浅部含水层后开始发生侧向运移,100 a内运移了约200 m的水平距离;由于浮力的作用,CO2集中在含水层顶板处,有效地防止了CO2向外泄漏.影响因素分析表明,100 a内断层渗透性能为低渗、中渗和高渗条件时,CO2累积泄漏量分别为0、1 050和3 000 t;CO2初始饱和度分别为0.20、0.50和0.99时,CO2累积泄漏量分别为550、1 050和1 650 t;初始泄漏压力分别为17.3、17.6和18.1 MPa时,CO2累积泄漏量则分别为900、1 050和1 400 t.除此之外,断层渗透性、CO2初始气体饱和度和初始泄漏压力对CO2泄漏的影响还体现在泄漏发生时间和平均泄漏速率上.研究显示,各因素对CO2沿断层泄漏过程的影响程度表现为断层渗透性能 > CO2初始饱和度 > CO2初始泄漏压力.
关键词:  CO2  泄漏量  断层  数值模拟  鄂尔多斯盆地
DOI:10.13198/j.issn.1001-6929.2017.02.88
分类号:
基金项目:大型煤气田及煤层气开发国家科技重大专项(2016ZX05016-005);中国地质调查局地质调查项目(121201012000150010)
Factors Influencing Amount of CO2 Leakage through a Fault Zone in Deep Storage Aquifer
XIA Yingli1,2, XU Tianfu1,2, YANG Zhijie1,2, FENG Guanhong1,2, YUAN Yilong1,2, TIAN Hailong1,2
1.College of Environment and Resources, Jilin University, Changchun 130021, China ;2.Key Lab of Groundwater Resources and Environment of Ministry of Education, Jilin University, Changchun 130021, China
Abstract:
Carbon dioxide geological storage (CGS) is one of the important ways to mitigate CO2. However, the presence of natural fractures is a potential risk of CGS. The cap rock and shallow aquifers covering a CO2 reservoir may be a natural barrier to prevent CO2 from leaking. According to the data of Ordos CO2 storage demonstration site, we established a 2D conceptual model based on the migration theory of multi-component and multiphase flow, using the numerical simulation software TOUGH2 to study the process of CO2 leakage along a fault from a deep saline aquifer, and to analyze the influence of fault porosity, permeability and the initial conditions of CO2 fluid (initial saturation, leak pressure) on the amount of CO2 leakage along the fault. The results showed that CO2 in deep saline aquifer will leak along the fault under the action of pressure difference and concentration difference, and then migrate laterally in the shallow aquifer. The distance of migration is about 200 m in 100 years. CO2 will be concentrated on the top because of buoyancy, and the aquifer can effectively prevent the leakage of CO2. The analyses of uncertain parameters showed that the accumulation of CO2 leakage was 0, 1050 and 3000 t when fault permeability was low, medium and high respectively over 100 years, and the accumulation of CO2 leakage was 550, 1050 and 1650 t when CO2 initial saturation was 0.20, 0.50 and 0.99 respectively. Moreover, the accumulation of CO2 leakage was 900, 1050 and 1400 t when CO2 initial leak pressure was 17.3, 17.6 and 18.1 MPa respectively. In addition, the leakage time and average leakage rate of CO2 have to do with the different levels of these three factors, and the effects of each influencing factor in the process of CO2 leakage can be arranged as follows:fault permeability > CO2 initial saturation > CO2 initial leak pressure.
Key words:  CO2  leakage amount  fault  numerical simulation  Ordos Basin