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The use of network topology to assess connectivity of deformation bands in sandstone: A quantitative approach based on digital outcrop models
Journal of Structural Geology ( IF 3.1 ) Pub Date : 2022-07-21 , DOI: 10.1016/j.jsg.2022.104682
Juliano Bonato , Francisco Manoel Wohnrath Tognoli , Francisco Cézar Costa Nogueira , Tiago Siqueira de Miranda , Leonardo Campos Inocencio

Clusters of deformation bands associated with fault damage zones modify the petrophysical properties of rocks and influence fluid migration. Many works discuss the influence of deformation bands regarding changes in porosity and permeability, but only a few address connectivity as a control of the fluid flow in porous media. We used digital outcrop models to perform a quantitative assessment of connectivity using a UAV-based system at the Melancias outcrop, Rio do Peixe Basin, Brazil. Topology determined the frequency, intensity and dimensionless intensity of deformation bands in three circular windows visually analyzed and interpreted. The geometry of the bands defines the proportion of node types, influences the distribution of I-, Y- and X-nodes, and controls the connectivity of fractures along the outcrop. Results provided by geometric and topological analyses corroborate connection per line as the more reliable connectivity indicator. Furthermore, they were crucial to defining the northeast sector as a corridor to fluid flow, whereas the other two sectors tend to be permeability barriers. We also analyzed the influence of trace lengths on the band network's overall orientation and geometric arrangement. For modeling and simulations purposes, the spatial relationships of nodes and branches help in the understand of potential hurdles to fluid migration and the variability of reservoirs and aquifers.



中文翻译:

使用网络拓扑评估砂岩变形带的连通性:基于数字露头模型的定量方法

与断层损伤带相关的变形带簇改变了岩石的岩石物理特性并影响了流体运移。许多著作讨论了变形带对孔隙度和渗透率变化的影响,但只有少数著作将连通性作为多孔介质中流体流动的控制。我们使用数字露头模型在巴西 Rio do Peixe 盆地的 Melancias 露头处使用基于无人机的系统对连通性进行了定量评估。拓扑确定了三个圆形窗口中变形带的频率、强度和无量纲强度,通过视觉分析和解释。带的几何形状定义了节点类型的比例,影响了 I、Y 和 X 节点的分布,并控制了沿露头的裂缝的连通性。几何和拓扑分析提供的结果证实每条线的连接是更可靠的连接指标。此外,它们对于将东北区域定义为流体流动通道至关重要,而其他两个区域往往是渗透屏障。我们还分析了走线长度对带状网络整体方向和几何排列的影响。出于建模和模拟的目的,节点和分支的空间关系有助于了解流体迁移的潜在障碍以及储层和含水层的可变性。我们还分析了走线长度对带状网络整体方向和几何排列的影响。出于建模和模拟的目的,节点和分支的空间关系有助于了解流体迁移的潜在障碍以及储层和含水层的可变性。我们还分析了走线长度对带状网络整体方向和几何排列的影响。出于建模和模拟的目的,节点和分支的空间关系有助于了解流体迁移的潜在障碍以及储层和含水层的可变性。

更新日期:2022-07-21
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