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Quantification of fault leakage dynamics based on leakage magnitude and dip angle
International Journal for Numerical and Analytical Methods in Geomechanics ( IF 4 ) Pub Date : 2021-08-10 , DOI: 10.1002/nag.3267
Saro Meguerdijian 1 , Birendra Jha 1
Affiliation  

Subsurface leakage of fluids, such as CO 2 , along faults is a key quantity to estimate when modeling underground fluid storage. Using our coupled multiphase flow-geomechanics-fault slip simulator, we quantify leakage dynamics using the fault dip angle and leakage magnitude, a proposed metric of gas leakage. We present novel leakage dynamics of faults to show that leakage is non-trivially coupled to induced seismicity and multiphase flow along faults due to the effect of fault dip. The onset time of induced fault slip, controlled by the initial shear-to-effective normal stress ratio on the fault, is a non-monotonic function of the fault dip. The leakage directions of gas and liquid phases are determined by the directions of slip propagation and the buoyancy vector, both of which depend on the dip. A consequence is that leakage evolution is non-monotonic in time for hanging wall injection-induced seismicity on a normal fault because of the competition between up-dip oriented buoyancy and down-dip oriented induced slip. With respect to monitoring, we note that subsidence at the location of an injection well could be indicative of leakage.

中文翻译:

基于泄漏量和倾角的断层泄漏动态量化

流体的地下泄漏,例如一氧化碳 2 , 沿断层是模拟地下流体储存时估计的关键量。使用我们的耦合多相流-地质力学-断层滑动模拟器,我们使用断层倾角和泄漏量级(建议的气体泄漏度量)量化泄漏动力学。我们提出了断层的新泄漏动力学,以表明由于断层倾角的影响,泄漏与诱发地震活动和沿断层的多相流非平凡地耦合。由断层上的初始剪切与有效正应力比控制的诱发断层滑动的开始时间是断层倾角的非单调函数。气相和液相的泄漏方向由滑移传播方向和浮力矢量决定,两者都取决于倾角。结果是,由于上倾导向浮力和下倾导向诱发滑动之间的竞争,正断层上的上倾壁注入诱发地震活动的泄漏演化在时间上是非单调的。关于监测,我们注意到注入井位置的沉降可能表明存在泄漏。
更新日期:2021-10-06
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