石英溶解对三维断裂网络中的流道化和传输行为的影响

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geochemistry Geophysics Geosystems Pub Date : 2024-07-05 DOI:10.1029/2024GC011550
Jeffrey D. Hyman, Alexis Navarre-Sitchler, Matthew R. Sweeney, Aleksandra Pachalieva, James W. Carey, Hari S. Viswanathan
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引用次数: 0

摘要

我们在三维断裂网络中进行了一系列反应传输模拟,以确定地球化学反应对流道化的影响。流道化是多孔和断裂地下岩层中经常观察到的一种现象,是地质结构提供的空间可变水力阻力的结果。除了网络连接、几何形状和水力阻力等地质结构特征外,溶解和沉淀等地球化学反应也会在动态上抑制或增强流道化。这些地球化学过程可以改变裂缝的渗透性,从而增加流道化,流道化是高容积流量的局部连通区域,在地下似乎无处不在。在我们的模拟中,部分充满石英的裂缝被逐渐溶解,直到获得准稳态条件。我们从流动和传输观测的角度对流场的初始未反应状态和最终溶解状态进行了比较。我们观察到,与未反应状态的断裂网络相比,溶解状态的断裂网络提供的流动阻力更小,并表现出更强的流动通道化。然而,这些变化的幅度存在很大差异,这意味着渠化在很大程度上取决于网络结构。进而,我们确定了特定网络结构与地球化学溶解对流动通道化的影响之间的相互作用。研究结果表明,在较古老的地貌中,经过较长时间风化或反应的地质系统,其水流渠化程度很可能会比同类但较年轻的地质系统更高,这意味着断裂介质中的水流渠化与时间有关。
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Quartz Dissolution Effects on Flow Channelization and Transport Behavior in Three-Dimensional Fracture Networks

We perform a set of reactive transport simulations in three-dimensional fracture networks to characterize the impact of geochemical reactions on flow channelization. Flow channelization, a frequently observed phenomenon in porous and fractured subsurface rock formations, results from the spatially variable hydraulic resistance offered by a geological structure. In addition to geo-structural features such as network connectivity, geometry, and hydraulic resistance, geochemical reactions, for example, dissolution and precipitation, can dynamically inhibit or enhance flow channelization. These geochemical processes can change the fracture permeability leading to increased flow channelization, which are localized connected regions of high volumetric flow rates that are seemingly ubiquitous in the subsurface. In our simulations, fractures partially filled with quartz are gradually dissolved until quasi-steady state conditions are obtained. We compare the flow field's initial unreacted and final dissolved states in terms of flow and transport observations. We observe that the dissolved fracture networks provide less resistance to flow and exhibit increased flow channelization when compared to their unreacted counterparts. However, there is substantial variability in the magnitude of these changes which implies that the channelization strongly depends on the network structure. In turn, we identify the interplay between the particular network structure and the impact of geochemical dissolution on flow channelization. The presented results indicate that geological systems that have been weathering or reactive for longer times in older landscapes are likely to have increased flow channelization compared to their equivalent but younger counterparts, which implies a time dependence on flow channelization in fractured media.

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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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