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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：断层区域建筑元素对孔隙压力传播和诱导地震性的作用

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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：我们使用水文层模型来评估故障区性能如何促进或抑制流体过压的向下传播从基础储存井（距离断层区域150米，Q = 5000米（3）/天）进入下面的结晶岩石中。作为数值敏感性研究的一部分，我们改变了断层区域建筑部件和结晶地下室风化层的渗透性。现实管道屏障风格断层区有效地传递与4年的连续注射相关的孔压力，在结晶地下室内约2.5克，同时在注射液内的流体流动。存在横向连续，相对低渗透性改变/风化的地下室（K（改变层）= 0.1×K（基底））可以将压力前沿的渗透深度限制在大约500μm。另一方面，在不阻挡故障流体导管的情况下部分限制注射储存器的不连续改变/风化的地平线的存在促进了压力向下传播。发现通过流体机械故障的渗透性提高，将早期压力前迁移的深度增加1.3至1.85。动态渗透性模型可能有助于解释大于10公里的深度的地震性，例如​​在二叠纪盆地，NM内观察到。

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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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