The impact of background water flow on the early migration of a CO2 plume in a tilted aquifer during the post-injection period

IF 9 1区地球科学 Q1 ENERGY & FUELS

Advances in Geo-Energy Research Pub Date : 2023-08-20 DOI:10.46690/ager.2023.08.06

Mawda Awag, Eric Mackay, Saeed Ghanbari

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引用次数: 1

Abstract

The study presents a numerical modelling analysis on CO2 plume migration in a dipping storage aquifer with background flux, which incorporates residual and dissolution trapping of CO2. The purpose of this analysis is to investigate the effect of the background flow velocity on the CO2 plume migration during the early post-injection period. Different velocities of groundwater flow from low to high were considered in the aquifer model. The distribution, migration distance and velocity of the injected CO2 plume as well as the remaining mobile CO2 plume extent are estimated to determine how fast and far the plume propagates with time. Comparison of the results indicate that increasing the background flux velocity causes the plume to migrate longer distances up-dip, while it reduces the height distribution of the plume with time. This reduces the volume of mobile CO2 in the storage aquifer at larger velocities of background flux, hence decreasing the leakage risk of CO2 to the surface. In addition, the CO2 plume decelerates immediately after cessation of injection as its bottom rises vertically and the buoyancy force reduces as the thickness of the plume reduces. However, the plume then accelerates during the initial period of its subsequent lateral migration, as the plume becomes extended, and the buoyancy forces increases somewhat. The degree of lateral extension increases with increasing background water flow velocity, with the leading tip of the plume migrating faster than the trailing edge, until residual and dissolution trapping sufficiently reduce the volume of free phase CO2 that its migration is arrested. Document Type: Original article Cited as: Awag, M., Mackay, E., Ghanbari, A. The impact of background water flow on the early migration of a CO2 plume in a tilted aquifer during the post-injection period. Advances in Geo-Energy Research, 2023, 9(2): 125-135. https://doi.org/10.46690/ager.2023.08.06

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注后阶段背景水流对倾斜含水层CO2柱早期运移的影响

研究了含背景通量的倾斜蓄水含水层中CO2羽流迁移的数值模拟分析，其中考虑了CO2的残余和溶解捕集。本分析的目的是研究注入后早期背景流速对CO2羽流迁移的影响。含水层模型考虑了地下水从低到高的不同流速。估算注入CO2羽流的分布、迁移距离和速度以及剩余的可移动CO2羽流范围，以确定羽流随时间传播的速度和距离。结果表明，背景通量速度的增大使羽流向上倾斜的迁移距离增大，同时减小了羽流高度随时间的分布。这在较大的背景通量速度下减少了储存含水层中流动二氧化碳的体积，从而降低了二氧化碳向地表泄漏的风险。另外，CO2羽流在停止喷射后，由于其底部垂直上升而立即减速，浮力随着羽流厚度的减小而减小。然而，在随后的横向迁移的初始阶段，随着羽流的延伸，羽流加速，浮力有所增加。横向扩展的程度随着背景水流速度的增加而增加，羽流的前端迁移速度快于尾缘，直到残余和溶解捕获足以减少自由相CO2的体积，从而阻止其迁移。引用本文:Awag, M.， Mackay, E.， Ghanbari, a .背景水流对倾斜含水层注入后早期CO2柱迁移的影响。地球能源研究进展，2023,9(2):125-135。https://doi.org/10.46690/ager.2023.08.06

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来源期刊

Advances in Geo-Energy Research natural geo-energy (oil, gas, coal geothermal, and gas hydrate)-Geotechnical Engineering and Engineering Geology

CiteScore

12.30

自引率

8.50%

发文量

审稿时长

2~3 weeks

期刊介绍： Advances in Geo-Energy Research is an interdisciplinary and international periodical committed to fostering interaction and multidisciplinary collaboration among scientific communities worldwide, spanning both industry and academia. Our journal serves as a platform for researchers actively engaged in the diverse fields of geo-energy systems, providing an academic medium for the exchange of knowledge and ideas. Join us in advancing the frontiers of geo-energy research through collaboration and shared expertise.