Basin architecture controls on the chemical evolution and 4He distribution of groundwater in the Paradox Basin
Basin architecture controls on the chemical evolution and 4He distribution of groundwater in the Paradox Basin
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盆地构造对 Paradox 盆地地下水化学演化和 4He 分布的控制
DOI：
10.1016/j.epsl.2022.117580
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发表时间：
2022
影响因子：
5.3
通讯作者：
Ballentine, C.J.
中科院分区：
文献类型：
--
作者：
Tyne, R.L.;Barry, P.H.;Cheng, A.;Hillegonds, D.J.;Kim, J.-H.;McIntosh, J.C.;Ballentine, C.J.
氦、氢、二氧化碳和碳氢化合物等流体在地壳中积累。地壳储层也有可能储存人为废物（如二氧化碳、乏核燃料）。了解流体运移及其如何受到盆地地层和演化的影响是开发流体聚集和确定可行储存地点的关键。惰性气体是流体迁移和化学演化的有力示踪剂，因为它们是惰性的，只能通过物理过程分解。特别是4he的分布，是了解盆地内扩散和地下水定年的重要工具。本文报道了美国科罗拉多高原Paradox盆地36口井的稀有气体同位素和丰度数据，该盆地具有丰富的油气、4He和co2聚集。地下水和碳氢化合物样本来自7个地层单元，包括Paradox组（p.m m）蒸发岩内部、上方和下方。气校正氦同位素比值（0.0046 ~ 0.127 RA）与主要由地下水衍生的稀有气体的放射性成因叠印一致。在P.Fm以下的地层中发现了最高的放射性惰性气体浓度。大气衍生的稀有气体特征与大气补给和p.m m上下的多相相互作用一致，在较浅地层中有更大的地下水-天然气相互作用。垂直扩散模型用于重建观测到的地下水氦浓度，显示P.Fm蒸发岩层对氦扩散有效不渗透，是可移动元素的区域屏障，但与其他盆地类似，需要一个基底的4he通量来积累P.Fm下观测到的4he浓度。证实蒸发岩是区域性不渗透扩散的，即使是最具扩散性的元素，对于盐下氦和氢的勘探和储存是重要的，也是确定4he推导的平均地下水年龄的关键参数。这对于认识盆地地层和变形对流体流动和天然气聚集的作用至关重要。
Fluids such as4He, H2, CO2and hydrocarbons accumulate within Earth's crust. Crustal reservoirs also have potential to store anthropogenic waste (e.g., CO2, spent nuclear fuel). Understanding fluid migration and how this is impacted by basin stratigraphy and evolution is key to exploiting fluid accumulations and identifying viable storage sites. Noble gases are powerful tracers of fluid migration and chemical evolution, as they are inert and only fractionate by physical processes. The distribution of4He, in particular, is an important tool for understanding diffusion within basins and for groundwater dating. Here, we report noble gas isotope and abundance data from 36 wells across the Paradox Basin, Colorado Plateau, USA, which has abundant hydrocarbon,4He and CO2accumulations. Both groundwater and hydrocarbon samples were collected from 7 stratigraphic units, including within, above and below the Paradox Formation (P.Fm) evaporites. Air-corrected helium isotope ratios (0.0046 - 0.127 RA) are consistent with radiogenic overprinting of predominantly groundwater-derived noble gases. The highest radiogenic noble gas concentrations are found in formations below the P.Fm. Atmosphere-derived noble gas signatures are consistent with meteoric recharge and multi-phase interactions both above and below the P.Fm, with greater groundwater-gas interactions in the shallower formations. Vertical diffusion models, used to reconstruct observed groundwater helium concentrations, show the P.Fm evaporite layer to be effectively impermeable to helium diffusion and a regional barrier for mobile elements but, similar to other basins, a basement4He flux is required to accumulate the4He concentrations observed beneath the P.Fm. The verification that evaporites are regionally impermeable to diffusion, of even the most diffusive elements, is important for sub-salt helium and hydrogen exploration and storage, and a critical parameter in determining4He-derived mean groundwater ages. This is critical to understanding the role of basin stratigraphy and deformation on fluid flow and gas accumulation.
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影响因子：
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影响因子：
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作者：
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影响因子：
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