Radiocarbon as a Reactive Tracer for Tracking Permanent CO<sub>2</sub> Storage in Basaltic Rocks

doi:10.2172/1238341

GSTDTAP > 地球科学

DOI	10.2172/1238341
报告编号	None
来源ID	OSTI ID: 1238341
	Radiocarbon as a Reactive Tracer for Tracking Permanent CO₂ Storage in Basaltic Rocks
	Matter, Juerg; Stute, Martin; Schlosser, Peter; Broecker, Wallace
	2015-09-30
出版年	2015
页数	47
语种	英语
国家	美国
领域	地球科学
英文摘要	In view of concerns about the long-term integrity and containment of CO₂ storage in geologic reservoirs, many efforts have been made to improve the monitoring, verification and accounting methods for geologically stored CO₂. Our project aimed to demonstrate that carbon-14 (¹⁴C) could be used as a reactive tracer to monitor geochemical reactions and evaluate the extent of mineral trapping of CO₂ in basaltic rocks. The capacity of a storage reservoir for mineral trapping of CO₂ is largely a function of host rock composition. Mineral carbonation involves combining CO₂ with divalent cations including Ca²⁺, Mg²⁺ and Fe²⁺. The most abundant geological sources for these cations are basaltic rocks. Based on initial storage capacity estimates, we know that basalts have the necessary capacity to store million to billion tons of CO₂ via in situ mineral carbonation. However, little is known about CO2-fluid-rock reactions occurring in a basaltic storage reservoir during and post-CO₂ injection. None of the common monitoring and verification techniques have been able to provide a surveying tool for mineral trapping. The most direct method for quantitative monitoring and accounting involves the tagging of the injected CO₂ with 14C because 14C is not present in deep geologic reservoirs prior to injection. Accordingly, we conducted two CO₂ injection tests at the CarbFix pilot injection site in Iceland to study the feasibility of 14C as a reactive tracer for monitoring CO₂-fluid-rock reactions and CO₂ mineralization. Our newly developed monitoring techniques, using 14C as a reactive tracer, have been successfully demonstrated. For the first time, permanent and safe disposal of CO₂ as environmentally benign carbonate minerals in basaltic rocks could be shown. Over 95% of the injected CO₂ at the CarbFix pilot injection site was mineralized to carbonate minerals in less than two years after injection. Our monitoring results confirm that CO₂ mineralization in basaltic rocks is far faster than previously postulated.
英文关键词	Monitoring verification and accounting CO2 mineralization CarbFix radiocarbon sulfurhexafluoride trifluoromethyl sulfur pentafluoride
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来源平台	US Department of Energy (DOE)
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/7016
专题	地球科学
推荐引用方式 GB/T 7714	Matter, Juerg,Stute, Martin,Schlosser, Peter,et al. Radiocarbon as a Reactive Tracer for Tracking Permanent CO₂ Storage in Basaltic Rocks,2015.