Plumbing the Depths: Testing Natural Tracers of Subsurface CO2 Origin and Migration, Utah
Plumbing the Depths: Testing Natural Tracers of Subsurface CO2 Origin and Migration, Utah
复制标题
探测深处：测试地下二氧化碳起源和迁移的天然示踪剂，犹他州
DOI：
10.1306/13171266st591353
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
C. Ballentine
中科院分区：
文献类型：
--
作者：
M. Wilkinson;S. Gilfillan;R. Haszeldine;C. Ballentine
流体二氧化碳在多孔地下岩石中的有效地质储存将需要能够追踪和识别在近地表测量到的任何二氧化碳渗漏的来源。在一项与就位后渗漏相关的研究中，我们检查了美国科罗拉多高原格林河周围的天然二氧化碳泉水，试图确定二氧化碳的来源。我们使用自然地球化学和同位素示踪相结合的方法来确定地表喷发的二氧化碳和水的来源。稳定的氧和氢同位素数据使人们能够估计，80%-90%的泉水来自浅层地下水，其余的来自深层咸水含水层。二氧化碳和水的体积意味着二氧化碳作为单独的流体或气体上升，而不仅仅是在孔隙水中的溶液中。二氧化碳的稳定碳同位素无法区分可能的来源。然而，二氧化碳中含有微量的稀有气体同位素，可以用来证明在地表喷发的二氧化碳中约有0-20%来自地幔，其余的来自地壳。在研究区内，观察到不同泉水的不同惰性气体特征，这意味着不存在先前提出的在浅层存在均匀的自由相聚集。在这种情况下，天然示踪剂能够解析二氧化碳的来源和迁移途径。从这项研究中，我们得出结论，如果在向地下添加人为二氧化碳之前进行基线调查，明确表征含水层水化学、二氧化碳和惰性气体含量，那么追踪人类储存的二氧化碳的误差和不确定性将大大减少。
The effective geological storage of fluid CO2 in porous subsurface rock will require the ability to track, and identify the origin of, any CO2 seepage measured at the near surface. In a study relevant to postemplacement seepage, we examine natural CO2 springs around Green River on the Colorado Plateau, United States, in an attempt to determine the CO2 origins. We use a combination of natural geochemical and isotopic tracers to fingerprint the origin of CO2 and water erupting at the surface. Stable oxygen and hydrogen isotope data enable the estimation that 80–90% of the spring water is derived from shallow groundwater, with the remainder originating from a deep saline aquifer. Carbon dioxide and water volumes imply the ascent of CO2 as a separate fluid or gas, not just in solution in the pore water. Stable carbon isotopes of CO2 are unable to discriminate between possible sources. However, the CO2 contains trace amounts of noble gas isotopes, which can be used to demonstrate that approximately 0–20% of CO2 erupted at the surface originates from the mantle, with the remainder originating from the crust. Within the study area, diverse noble gas signatures at different springs are observed, implying that no homogeneous free-phase accumulation at shallow depths exists as has been previously proposed. Natural tracers are, in this case, capable of resolving CO2 origins and migration pathways. From this study, we conclude that the errors and uncertainty in tracing anthropogenically stored CO2 will be reduced dramatically if a baseline survey is conducted to unambiguously characterize aquifer water chemistry, CO2, and noble gas content, before the addition of anthropogenic CO2 to the subsurface.
影响因子：
5
作者：
Gilfillan, Stuart Mn.;Ballentine, Chris J.;Cassidy, Martin
通讯作者：
Cassidy, Martin