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首页> 外文会议>Geothermal Resources Council Annual Meeting >Electrical Resistivity as an Indicator of Saturation in Fractured Geothermal Reservoir Rocks: Experimental Data and Modeling
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Electrical Resistivity as an Indicator of Saturation in Fractured Geothermal Reservoir Rocks: Experimental Data and Modeling

机译：作为裂缝地热储层岩石中饱和度的电阻率：实验数据和建模

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The electrical resistivity of rock cores under conditions representative of geothermal reservoirs is strongly influenced by the state and phase (liquid/vapor) of the pore fluid. In fractured samples, phase change (vaporization/condensation) can result in resistivity changes that are more than an order of magnitude greater than those measured in intact samples. These results suggest that electrical resistivity monitoring of geothermal reservoirs may provide a useful tool for remotely detecting the movement of water and steam within fractures, the development and evolution of fracture systems and the formation of steam caps. We measured the electrical resistivity of cores of welded tuff containing fractures of various geometries to investigate the resistivity contrast caused by active boiling and to determine the effects of variable fracture dimensions and surface area on water extraction from the matrix. We then used the Nonisothermal Unsaturated Flow and Transport model (NUFT) (Nitao, 1998) to simulate the propagation of boiling fronts through the samples. The simulated saturation profiles combined with previously reported measurements of resistivity-saturation curves allow us to estimate the evolution of the sample resistivity as the boiling front propagates into the rock matrix. These simulations provide qualitative agreement with experimental measurements suggesting that our modeling approach may be used to estimate resistivity changes induced by boiling in more complex systems.
机译：在地热储层代表代表的条件下岩石核的电阻率受到孔隙流体的状态和相（液体/蒸气）的影响。在裂缝样品中，相变（汽化/缩合）可以导致电阻率变化，其比在完整样品中测量的大小大。这些结果表明地热储层的电阻率监测可以提供一种有用的工具，用于远程检测水和蒸汽在裂缝中的运动，裂缝系统的开发和演化以及蒸汽盖的形成。我们测量了含有各种几何形状的裂缝骨折的芯的电阻率，以研究活性沸腾引起的电阻率对比，并确定可变性断裂尺寸和表面积对基质的水提取的影响。然后，我们使用了非等温不饱和流量和运输模型（NOTAO，1998）来模拟沸点通过样品的繁殖。模拟饱和型材与先前报道的电阻率饱和曲线的测量相结合，使我们能够估计随着沸点传播到岩石基质中的样品电阻率的演变。这些模拟提供了与实验测量的定性协议，表明我们的建模方法可用于估算沸腾在更复杂的系统中所引起的电阻率变化。

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