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Two Dimensional Subsidence Modelling at Wairakei-Tauhara, New Zealand

机译:Wairakei-Tauhara,新西兰的二维沉降模型

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Subsidence at Wairakei-Tauhara due to almost 50 years of geothermal fluid extraction was modelled by two dimensional finite-element analysis. The modelling accommodates variable rock properties, including non-linear stress-strain behaviour, and pre-consolidation history. A good match to historical subsidence in time and space was achieved with a single set of rock properties for each geological unit, apart from two local zones with different permeability. Compared to previous 1-D subsidence modelling, this study shows a greater sensitivity to changes in reservoir pressure and strong control over the location of subsidence by the morphology of the lowest unit in the Huka Falls Formation. It is predicted that subsidence may lead to subsurface shear failure, which will enhance vertical permeability, and therefore cause an acceleration of subsidence rates.
机译:Wairakei-Tauhara的沉降由于近50年的地热流体提取被两维有限元分析为模型。建模可容纳可变岩石属性,包括非线性应力 - 应变行为和预先整合历史。对于每个地质单位的一组岩石属性,除了两个具有不同渗透性的局部区域的一组岩石属性,实现了与时间和空间的历史沉降和空间的良好匹配。与之前的1-D沉降建模相比,该研究表明,对水库压力的变化和对沉降位置的强度控制,通过Huka瀑布形成的最低单位的形态,对水库压力的变化更大的敏感性。据预测,沉降可能导致地下剪切失效,这将增强垂直渗透率,因此导致沉降速率的加速度。

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