Using chemical and isotopic data to quantify ionic trapping of injected carbon dioxide in oil field brines.
Using chemical and isotopic data to quantify ionic trapping of injected carbon dioxide in oil field brines.
复制标题
使用化学和同位素数据来量化油田盐水中注入二氧化碳的离子捕获。
DOI：
10.1021/es060551a
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发表时间：
2006
影响因子：
11.4
通讯作者：
B. Gunter
中科院分区：
文献类型：
--
作者：
M. Raistrick;B. Mayer;M. Shevalier;R. Pérez;I. Hutcheon;E. Perkins;B. Gunter
将二氧化碳注入枯竭的油田或深层盐水层是长期储存这种温室气体的最有希望的手段之一。虽然地下注入CO2的最终目标是将CO2以碳酸盐的形式进行矿物储存，但注入CO2的短期（<50年）储存最有可能通过将CO2以碳酸氢根离子（HCO 3-）的形式进行离子捕集和将分子CO2进行水文地质捕集来实现。在这里，我们展示了一种技术，用于量化离子捕获注入CO2 HCO 3-使用地球化学数据收集之前和期间40个月的CO2注入到碳氢化合物储层在国际能源署（IEA）韦伯恩CO2监测和存储项目，加拿大萨斯喀彻温省。由于注入CO2与低碳同位素比（δ 13 C值），流体和气体样品从四个选定的生产井威尔斯显示出增加的HCO 3-浓度和减少在δ 13 C值的HCO 3-和CO2在观察期间。同位素和质量平衡计算表明，注入40个月后，从4口威尔斯井取样的储层卤水中约80%的HCO 3-通过溶解和分解注入的CO2形成。这种化学和同位素技术应适用于CO2注入和储存在油田和深层盐水层，提供注入的CO2和基线含水层HCO 3-和CO2之间有足够的碳同位素的区别。
Injection of carbon dioxide into depleted oil fields or deep saline aquifers represents one of the most promising means of long-term storage of this greenhouse gas. While the ultimate goal of CO2 injection in the subsurface is mineral storage of CO2 as carbonates, short-term (<50 year) storage of injected CO2 is most likely to be accomplished by ionic trapping of CO2 as bicarbonate ions (HCO3-) and hydrogeological trapping of molecular CO2. Here, we demonstrate a technique for quantifying ionic trapping of injected CO2 as HCO3- using geochemical data collected prior to and during 40 months of CO2 injection into a hydrocarbon reservoir at the International Energy Agency (IEA) Weyburn CO2 Monitoring and Storage Project, Saskatchewan, Canada. As a result of injection of CO2 with a low carbon isotope ratio (delta13C value), fluid and gas samples from four selected production wells showed an increase in HCO3- concentration and a decrease in delta13C values of HCO3- and CO2 over the observation period. Isotope and mass balance calculations indicate that, after 40 months of injection, approximately 80% of the HCO3- in the reservoir brines sampled from the four wells formed via dissolution and dissociation of injected CO2. This chemical and isotopic technique should be applicable to CO2 injection and storage in oil fields and in deep saline aquifers, provided there is sufficient carbon isotopic distinction between injected CO2 and baseline aquifer HCO3- and CO2.