Unveiling the Beneficial Effects of N2 as a CO2 Impurity on Fluid-Rock Reactions during Carbon Sequestration in Carbonate Reservoir Aquifers: Challenging the Notion of Purer Is Always Better

IF 10.8 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Chao Zhang, Pengfei Li, Zengmin Lun, Zihan Gu, Zhaomin Li
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Abstract

CO2-enhanced oil recovery (CO2-EOR) is widely used in reservoir development, but its implementation is often limited by scarce pure CO2 sources and high carbon capture costs. Flue gas from steam injection boilers typically contains 10–15% CO2 and 80–85% N2, both of which serve as effective gas displacement agents. Injecting flue gas or CO2/N2 mixtures into reservoirs can reduce carbon emissions, sequester CO2, and enhance recovery. Therefore, this study proposes a concept of enriching rather than capturing flue gas for storage, with a focus on how N2 as an impurity affects the safety of CO2 storage. This study examines interactions between gas mixtures with varying CO2 enrichment rates (with N2 impurities) and minerals. It performs microarea analyses of aged rocks using ultradepth-of-field microscope and atomic force microscopy (AFM), assesses calcite wettability via contact angle tests, and evaluates CO2 storage column height under experimental conditions. Results indicate that with a CO2 enrichment of at least 50%, adding N2 creates additional dissolution pits on calcite surfaces. The calcite matrix exhibits optimal water-wettability at 50–75% CO2 enrichment, facilitating greater CO2 storage column heights. This suggests coinjecting N2 and CO2 can enhance long-term CO2 storage safety and reduce capture costs.

Abstract Image

揭示N2作为CO2杂质对碳酸盐储层固碳过程中流体-岩石反应的有利影响:挑战“越纯净越好”的概念
二氧化碳提高采收率(CO2- eor)广泛应用于油藏开发,但其实施往往受到纯二氧化碳来源稀缺和高碳捕集成本的限制。注汽锅炉的烟气通常含有10-15%的CO2和80-85%的N2,两者都是有效的气体置换剂。向储层注入烟气或CO2/N2混合物可以减少碳排放、封存CO2并提高采收率。因此,本研究提出了富集而不是捕获烟气进行储存的概念,重点研究了N2作为杂质如何影响CO2储存的安全性。本研究考察了具有不同CO2富集率(含N2杂质)的气体混合物与矿物之间的相互作用。它使用超景深显微镜和原子力显微镜(AFM)对古老岩石进行微区分析,通过接触角测试评估方解石的润湿性,并在实验条件下评估二氧化碳储存柱的高度。结果表明,当CO2富集至少50%时,加入N2会在方解石表面产生额外的溶解坑。方解石基质在CO2富集50-75%时表现出最佳的水润湿性,有利于提高CO2存储柱的高度。这表明共注入N2和CO2可以提高CO2长期储存的安全性并降低捕集成本。
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来源期刊
环境科学与技术
环境科学与技术 环境科学-工程:环境
CiteScore
17.50
自引率
9.60%
发文量
12359
审稿时长
2.8 months
期刊介绍: Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.
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