裂缝性地热储层诱发地震活动性及裂缝活化的数值研究

Manojkumar Gudala, Zhen Xu, Zeeshan Tariq, B. Yan, Shuyu Sun
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摘要

本文建立了具有可变岩石/裂缝/流体参数的地热储层热-水-力学过程的数学模型。在相同工况下,裂隙网络对冷柱运动、孔隙压力、岩石/裂隙有效应力变化的影响。注入流体在相互连接的裂缝中从注入井输送到抽采井。在同一方向上观察到有效应力、孔隙压力在岩石基质和裂缝中的变化。由于裂缝内有效应力的变化,会发生剪切作用,改变裂缝孔径。裂缝孔径的这种变化将在裂缝性地热储层中产生微地震矩。微震矩震级和超中心震级随时间变化,对各裂缝组的连通性高度敏感。所建立的数学模型能有效地观察到这些变化。因此,所建立的模型可用于解决裂缝性地热储层在整个采热过程中发生的变化,并结合裂缝的激活和每个地震时刻的超中心位置。
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Numerical Investigations on Induced Seismicity and Fracture Activation in Fractured Geothermal Reservoirs
In this study we developed mathematical model for thermo-hydro-mechanical process occurs within the geothermal reservoir with variable rock/fracture/fluid parameters. The influence of fracture network on the cold plume movement, pore pressure, changes in the rock/fracture effective stress under the same operating conditions. The injected fluid transport to extraction well from injection well within the interconnected fractures. In the same direction variation of the effective stress, pore pressure both in rock matrix and fractures was observed. Due to the variation of effective stress in the fracture, it will undergo shearing and alter the fracture aperture. This variation of fracture aperture will create a micro-seismic moment in the fractured geothermal reservoir. The magnitude of micro-seismic moment and hyper center were changing with time and highly sensitive to the fracture connectivity of each fracture set. The developed mathematical model was observed these variations efficiently. Thus, the developed model can be utilized to address the variations occurred throughout the heat extraction in the fractured geothermal reservoir in conjunction with the activation of fracture and location of hyper center of each seismic moment.
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