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首页> 外文期刊>Ground water >The Role of Fault-Zone Architectural Elements on Pore Pressure Propagation and Induced Seismicity
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The Role of Fault-Zone Architectural Elements on Pore Pressure Propagation and Induced Seismicity

机译：断裂带建筑元素在孔隙压力传播和地震诱发作用中的作用

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摘要

We used hydrogeologic models to assess how fault-zone properties promote or inhibit the downward propagation of fluid overpressures from a basal reservoir injection well (150 m from fault zone, Q = 5000 m(3)/day) into the underlying crystalline basement rocks. We varied the permeability of the fault-zone architectural components and a crystalline basement weathered layer as part of a numerical sensitivity study. Realistic conduit-barrier style fault zones effectively transmit elevated pore pressures associated with 4 years of continuous injection to depths of approximately 2.5 km within the crystalline basement while compartmentalizing fluid flow within the injection reservoir. The presence of a laterally continuous, relatively low-permeability altered/weathered basement horizon (k(altered layer) = 0.1 x k(basement)) can limit the penetration depth of the pressure front to approximately 500 m. On the other hand, the presence of a discontinuous altered/weathered horizon that partially confines the injection reservoir without blocking the fault fluid conduit promotes downward propagation of pressures. Permeability enhancement via hydromechanical failure was found to increase the depth of early-time pressure front migration by a factor of 1.3 to 1.85. Dynamic permeability models may help explain seismicity at depths of greater than 10 km such as is observed within the Permian Basin, NM.
机译：我们使用水文地质模型来评估断层带特性如何促进或抑制流体超压从基底储层注水井（距断层带150 m，Q = 5000 m（3）/天）向下传播到下伏的结晶基底岩中。作为数值敏感性研究的一部分，我们改变了断层带建筑构件和晶体基底风化层的渗透性。实际的导管屏障式断层带有效地将与连续注水4年相关的升高的孔隙压力有效地传递到结晶基底内约2.5 km的深度，同时分隔注入储层内的流体流。横向连续，渗透率相对较低的变化/风化的地下室地层的存在（k（改变的层）= 0.1 x k（地下室））可以将压力前沿的穿透深度限制为大约500 m。另一方面，不连续的变化/风化的地层的存在部分地限制了注入储层而不阻塞断层流体导管，这促进了压力的向下传播。人们发现，通过水力机械破坏提高了渗透率，使早期压力前沿运移的深度增加了1.3到1.85。动态渗透率模型可以帮助解释大于10 km深度的地震活动，例如在新墨西哥州的二叠纪盆地中观察到的。

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  • 来源
    《Ground water》 |2019年第3期|465-478|共14页
  • 作者

    Ortiz John P.; Person Mark A.; Mozley Peter S.; Evans James P.; Bilek Susan L.;

  • 作者单位

    Los Alamos Natl Lab, Computat Earth Sci Grp, Los Alamos, NM 87544 USA;

    New Mexico Inst Min & Technol New Mexico Tech, Dept Earth & Environm Sci, Socorro, NM 87801 USA;

    New Mexico Inst Min & Technol New Mexico Tech, Dept Earth & Environm Sci, Socorro, NM 87801 USA;

    Utah State Univ, Dept Geol, Logan, UT 84322 USA;

    New Mexico Inst Min & Technol New Mexico Tech, Dept Earth & Environm Sci, Socorro, NM 87801 USA;

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