受多相CO2泄漏影响的浅含水层中Pb2+的潜在动员、运输和封存:来自犹他州西南部维珍河流域的自然模拟研究

IF 1.9 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Michelle R. Plampin, M. Blondes, E. Sonnenthal, W. Craddock
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引用次数: 1

摘要

地质碳封存(GCS)对于实现减排目标是必要的,但如果二氧化碳和/或盐水从深层储层泄漏到浅层地下,可能会造成地下水污染。在这项研究中,研究人员研究了一个自然模拟:在犹他州西南部的维珍河流域,中等盐度和高浓度二氧化碳的水向上泄漏到含有重金属固结物的浅层含水层。该含水层系统由Navajo和Kayenta地层组成,它们遍布犹他州南部,在足够深的地方被认为是潜在的GCS注入单元。基于实测的水化学和前人研究的水头分布,建立了该地点的数值模型。模拟是为了更好地了解流入含水层的上升流的速率和分布,并评估如果上升流与氧化铁和其他重金属(代表该地区常见的固结物)区相互作用可能发生的反应性输运过程。测试了不同的矿物学,包括Pb2+被吸附在铁水合物上的矿物学,以及Pb2+被结合在锂矿(PbO)和赤铁矿(Fe2O3)的固体混合物中的矿物学。结果表明,金属的迁移很大程度上取决于源区组成,而Pb2+的输运可以通过气相形成和碳酸盐矿物沉淀而自然减弱。这些发现可用于改进地质碳封存地点的风险评估和缓解战略。专题合集:本文是地球科学CO2储存合集的一部分,可在:https://www.lyellcollection.org/cc/geoscience-for-co2-storage上获得
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Potential Pb2+ mobilization, transport, and sequestration in shallow aquifers impacted by multiphase CO2 leakage: a natural analogue study from the Virgin River Basin in SW Utah
Geological carbon sequestration (GCS) is necessary to help meet goals for emissions reduction, but groundwater contamination may occur if CO2 and/or brine were to leak out of deep storage formations into the shallow subsurface. For this study, a natural analogue was investigated: in the Virgin River Basin of SW Utah, water with moderate salinity and high CO2 concentrations is leaking upwards into shallow aquifers that contain heavy-metal-bearing concretions. The aquifer system is comprised of the Navajo and Kayenta formations, which are pervasive across southern Utah and have been considered as a potential GCS injection unit where they are sufficiently deep. Numerical models of the site were constructed based on measured water chemistry and head distributions from previous studies. Simulations were used to improve understanding of the rate and distribution of the upwelling flow into the aquifers, and to assess the reactive transport processes that may occur if the upwelling fluids were to interact with a zone of iron oxide and other heavy metals, representing the concretions that are common in the area. Various mineralogies were tested, including one in which Pb2+ was adsorbed onto ferrihydrite, and another in which it was bound within a solid mixture of litharge (PbO) and hematite (Fe2O3). Results indicate that metal mobilization depends strongly on the source-zone composition and that Pb2+ transport can be naturally attenuated by gas-phase formation and carbonate-mineral precipitation. These findings could be used to improve risk assessment and mitigation strategies at geological carbon sequestration sites. Thematic collection: This article is part of the Geoscience for CO2 storage collection available at: https://www.lyellcollection.org/cc/geoscience-for-co2-storage
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来源期刊
Petroleum Geoscience
Petroleum Geoscience 地学-地球科学综合
CiteScore
4.80
自引率
11.80%
发文量
28
审稿时长
>12 weeks
期刊介绍: Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE). Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership. Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.
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