ScCO2-H2O 处理持续时间对煤储层微观结构的影响:煤中二氧化碳地质封存的意义

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Yarui Guan , Zhe Zhou , Zhaolong Ge , Qinglin Deng , Yunzhong Jia , Shan Huang , Changjiang Chen , Shihui Gong
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引用次数: 0

摘要

煤储层的微观结构,尤其是孔隙结构,会因二氧化碳酸性流体与煤之间的物理化学反应而发生变化。然而,目前还不清楚是什么控制了这一过程,也不清楚煤的孔隙结构特性是如何在二氧化碳酸性流体的作用下随着时间的推移而改变的。本研究的目的是通过分析无烟煤和烟煤在暴露于超临界 CO2(ScCO2)-H2O 时的矿物成分、表面粗糙度以及微孔和中孔结构的变化,找出其基本机制。结果表明,煤储层主要经历了吸附膨胀和矿物溶解/沉淀过程。其中,吸附膨胀在 7 天后结束或减弱,矿物沉淀逐渐成为主导因素,从而使二氧化碳地质封存(GCS)更加安全。此外,对无烟煤和烟煤未经处理和长期处理的对比分析表明,无烟煤具有更高的二氧化碳封存能力和更强的润湿性。因此,与烟煤相比,无烟煤更适合作为 GCS 的目标储层。因此,这些结果为在深部不可开采煤层中选择全球碳捕集与封存地点提供了理论基础和指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of ScCO2-H2O treatment duration on the microscopic structure of coal reservoirs: Implications for CO2 geological sequestration in coal

The microstructure of coal reservoirs, especially the pore structure, alters as a result of physicochemical reactions between the CO2 acidic fluid and coals. However, it is still unclear what controls this process and how the pore structure properties of coal alter by the action of CO2 acid fluids change over time. The objective of this study is to identify the underlying mechanism by analyzing the changes in the mineral composition, surface roughness, as well as micropore and mesopore structure of anthracite and bituminous coal when exposed to supercritical CO2 (ScCO2)-H2O. The results indicate that coal reservoirs primarily undergo processes of adsorption expansion and mineral dissolution/precipitation. Among these, adsorption expansion concluded or weakened after 7 days, with mineral precipitation gradually becoming the dominant factor, which results in more secure geological CO2 storage (GCS). Furthermore, comparative analysis of anthracite and bituminous coal with untreated and long-term treatment demonstrates that anthracite exhibits higher CO2 storage capacity and greater wettability. Consequently, anthracite is more suitable as a target reservoir for GCS compared to bituminous coal. These results, therefore, offer a theoretical foundation and a guide for choosing GCS sites in deep un-minable coal seams.

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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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