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Onset of density-driven instabilities in fractured aquifers

机译：裂缝含水层中密度驱动的不稳定性发作

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Linear stability analysis is conducted to study the onset of density-driven convection involved in solubility trapping of CO_2 in fractured aquifers. The effect of physical properties of a fracture network on the stability of a diffusive boundary layer in a saturated fractured porous media is investigated using the dual porosity concept. Linear stability analysis results showthat both fracture interporosity flowand fracture storativity play an important role in the stability behavior of the system. It is shown that a diffusive boundary layer under the gravity field in fractured porous media with lower fracture storativity and/or higher fracture interporosity flow coefficient is more stable. We present scaling relations for the onset of convective instability in fractured aquifers with single and variable matrix block size distribution. These findings improve our understanding of density-driven flow in fractured aquifers and are important in the estimation of potential storage capacity, risk assessment, and storage site characterization and screening.
机译：进行线性稳定性分析，以研究裂解含水层中溶解度诱捕的密度驱动对流发作。使用双孔隙概念研究了裂缝网络对饱和骨折多孔介质中衍射边界层稳定性的影响。线性稳定性分析结果表明，骨折型流动性裂缝缺损余胎在系统的稳定行为中起重要作用。结果表明，裂缝多孔介质中的重力场下的漫射边界层，具有较低的裂缝余量和/或更高的裂缝型流量流量系数更稳定。我们在具有单个和可变矩阵块尺寸分布的裂缝含水层中的对流不稳定发作的扩展关系。这些发现改善了我们对骨折含水层中密度驱动的流动的理解，并且在估计潜在的储存能力，风险评估和存储站点表征和筛选方面都很重要。

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