Effect of Poroelastic Coupling and Fracture Dynamics on Solute Transport and Geomechanical Stability
Effect of Poroelastic Coupling and Fracture Dynamics on Solute Transport and Geomechanical Stability
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DOI：
10.1029/2021wr029584
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发表时间：
2021-09
影响因子：
5.4
通讯作者：
M. Tran;B. Jha
中科院分区：
文献类型：
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作者：
M. Tran;B. Jha
溶质运移和岩石地质力学过程之间的耦合，例如，流动诱导的裂缝活化，由于其在地下废物处理，碳封存，污染物修复，提高石油采收率和基于示踪剂的油藏监测等应用中的作用，已成为一个重要的水文地质挑战。尽管最近在模拟流动和地质力学耦合方面取得了进展，但缺乏一种整体方法来捕获流体流动，溶质运移，诱导应力和断裂力学之间的协同作用。本研究探讨了丰富的这些过程之间的相互作用，提出了一种新的计算框架，以解决耦合的流动，运输，地质力学和断裂力学问题。嵌入式离散裂缝模型（EDFM）方法用于模拟裂缝多孔介质中的流动和输运过程，而改进的Bandis模型用于捕获对流动引起的应力扰动的裂缝力学响应。运输地质力学耦合的作用，在调制的扩散和粘性不稳定的流动过程中的溶质段塞的可溶解性进行检查。我们研究如何流动-运输耦合，参数化通过溶质粘度对比和裂缝渗透率，影响应力状态和裂缝稳定性的域。一个案例研究，灵感来自一个吞吐示踪剂返排研究，进行调查的适用性所提出的框架在该领域。进行敏感性分析，以评估全球运输特性，渗透率的演变，和断裂稳定性的参数决定的地质力学，流动和运输之间的耦合强度的依赖。
The coupling between solute transport and rock's geomechanical processes, for example, flow‐induced fracture activation, has emerged as an important hydrogeological challenge due to its role in applications such as underground waste disposal, carbon sequestration, contaminant remediation, enhanced oil recovery, and tracer‐based reservoir surveillance. Despite recent advances in modeling flow and geomechanics coupling, a holistic approach to capturing the synergy between fluid flow, solute transport, induced stresses, and fracture mechanics is lacking. This study investigates the rich interplay between these processes within a novel computational framework that is proposed to solve the coupled flow, transport, geomechanics, and fracture mechanics problem. The Embedded Discrete Fracture Modeling (EDFM) method is used to model the flow and transport processes in fractured porous media while an improved Bandis model is employed to capture the fracture mechanical response to flow‐induced stress perturbations. The role of transport‐geomechanics coupling in modulating the spreading and miscibility of a solute slug during viscously unstable flows is examined. We investigate how flow‐transport coupling, parameterized through the solute viscosity contrast and the fracture permeability, influences the stress state and fracture stability in the domain. A case study, inspired by a huff‐n‐puff tracer flowback study, is conducted to investigate the applicability of the proposed framework in the field. A sensitivity analysis is performed to evaluate the dependence of global transport characteristics, permeability evolution, and fracture stability on parameters dictating the strength of coupling between geomechanics, flow, and transport.