Investigation of injection-induced seismicity using a coupled fluid flow and rate/state friction model
Investigation of injection-induced seismicity using a coupled fluid flow and rate/state friction model
复制标题
DOI：
10.1190/geo2011-0064.1
复制
发表时间：
2011-11
期刊：
影响因子：
3.3
通讯作者：
M. McClure;R. Horne
中科院分区：
文献类型：
--
作者：
M. McClure;R. Horne
我们描述了对注入单个孤立裂缝引起的地震活动的数值研究。注入单个孤立裂缝是增强地热系统 (EGS) 中剪切刺激的简单模拟，在此过程中，水被注入裂缝性低渗透性岩石中，引发预先存在的大规模裂缝区域的滑移。开发并使用了一个模型，该模型耦合了（1）流体流动，（2）速率和状态摩擦，以及（3）裂缝单元之间的机械应力相互作用。基于该模型的结果，我们提出了一种机制来描述剪切刺激期间刺激区域生长的过程，我们将其称为顺序刺激（SS）机制。如果 SS 机制是现实的，它将破坏为估计最小主应力和未受激水力扩散率而做出的假设。我们研究了注入压力对诱发地震活动的影响。对于恒压注射，没有显着...
We describe a numerical investigation of seismicity induced by injection into a single isolated fracture. Injection into a single isolated fracture is a simple analog for shear stimulation in enhanced geothermal systems (EGS) during which water is injected into fractured, low permeability rock, triggering slip on preexisting large scale fracture zones. A model was developed and used that couples (1) fluid flow, (2) rate and state friction, and (3) mechanical stress interaction between fracture elements. Based on the results of this model, we propose a mechanism to describe the process by which the stimulated region grows during shear stimulation, which we refer to as the sequential stimulation (SS) mechanism. If the SS mechanism is realistic, it would undermine assumptions that are made for the estimation of the minimum principal stress and unstimulated hydraulic diffusivity. We investigated the effect of injection pressure on induced seismicity. For injection at constant pressure, there was not a signifi...