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首页> 外文会议>23rd New Zealand Geothermal Workshop 2001, 2001, Auckland >NEW 2-D SUBSIDENCE MODELLING APPLIED TO WAIRAKEI-TAUHARA
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NEW 2-D SUBSIDENCE MODELLING APPLIED TO WAIRAKEI-TAUHARA

机译：适用于WAIRAKEI-TAUHARA的新型二维沉降建模

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摘要

Two-dimensional finite-element analysis has been applied to the question of subsidence in the Wairakei-Tauhara area, caused by abstraction of geothermal fluid. The software used has the facility to accommodate variable rock properties, including non-linear stress-strain behaviour, and the pre-consolidation history. It was found necessary to use strongly anisotropic permeabilities, which emphasises the importance of using a 2-D model. Results show a good match in time and space to historical subsidence. This has been achieved with a single set of rock properties for each geological unit, apart from locally enhanced vertical permeability under the Wairakei subsidence bowl. Compared to previous 1-D subsidence modelling, the current 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 will continue for longer, and so eventually be larger, than previous modelling has predicted. However major subsidence is not anticipated to encroach on the Taupo urban area.
机译：二维有限元分析已被应用到由地热流体抽象引起的怀拉基-陶哈拉地区的沉降问题中。所使用的软件具有适应各种岩石特性的功能，包括非线性应力应变行为和预固结历史。发现必须使用强各向异性的磁导率，这强调了使用二维模型的重要性。结果显示出时间和空间与历史沉降的良好匹配。除了在Wairakei沉降碗下局部增强的垂直渗透率外，每个地质单元都具有一套岩石属性，从而实现了这一目标。与以前的一维沉降模型相比，当前的研究显示，对胡卡瀑布组最低单元的形态对储层压力变化的敏感性更高，并且对沉降位置的控制也很强。预计沉降将比以前的模型预测的持续时间更长，因此最终会更大。但是，预计大沉降不会侵扰陶波市区。

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