A geothermal exploration corehole was drilled to a total depth of 1821.5 m on the Mountain Home Air Force Base near Mountain Home, Idaho. The corehole was used to collect an unusually large amount of data, including uniaxial compressive stress (UCS) experiments on core samples, to evaluate the geothermal potential of the western Snake River Plain. In addition, unlike many exploration holes in this region, a fluid entry was encountered at 1745.3 m and flowed artesian to the surface. A maximum temperature of 149.4 °C was calculated for the entry. A temperature log run on the corehole from 3 to 1675 m is nearly linear with little variation. The average geothermal gradient is 73 °C/km, and the average heat flow between 200 and 1500 m is 102 ± 15 mW/m2. Chemical analyses of a sample from the fluid entry suggest that a significant proportion of the water is not meteoric. Five geothermometers show equilibrium temperature in the range of 133–157 °C. Furthermore, based on the unconfined UCS experiments on basalt core samples, a brittle unit was found to comprise the fractured reservoir that the geothermal water flows from, while an overlying ductile unit acts as a hydrothermal caprock. This implies that the reservoir/caprock pair may be a target for future exploration wells drilled to delineate the extent of the potential resource and the boundaries of the connected fracture network.

中文翻译：

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基于爱达荷州芒廷霍姆附近的芒廷霍夫空军基地的深孔，评估蛇河平原西部的地热潜力

在爱达荷州山之家附近的山之家空军基地钻了一个地热勘探井眼，总深度为1821.5 m。岩心孔被用来收集异常大量的数据，包括对岩心样品进行单轴压缩应力（UCS）实验，以评估蛇河平原西部的地热潜力。此外，与该区域的许多勘探孔不同，在1745.3 m处遇到了流体进入，并使自流井流到了地面。计算得出该条目的最高温度为149.4°C。在芯孔上从3到1675 m的温度测井曲线几乎是线性的，几乎没有变化。平均地热梯度为73°C / km，200至1500 m之间的平均热流为102±15 mW / m2。对来自流体入口的样品的化学分析表明，很大一部分水不是大气的。五个地热仪显示平衡温度在133–157°C的范围内。此外，基于对玄武岩岩心样品的无限制UCS实验，发现脆性单元包括地热水从中流出的裂缝性储层，而上覆的韧性单元则充当热液盖层。这意味着油藏/盖层对可能成为未来钻探井的目标，以描绘潜在资源的范围和相连的裂缝网络的边界。发现一个脆性单元包括地热水从其流出的裂缝性储层，而上覆的韧性单元则充当热液盖层。这意味着油藏/盖层对可能成为未来钻探井的目标，以描绘潜在资源的范围和相连的裂缝网络的边界。发现一个脆性单元包括地热水从其流出的裂缝性储层，而上覆的韧性单元则充当热液盖层。这意味着油藏/盖层对可能成为未来钻探井的目标，以描绘潜在资源的范围和相连的裂缝网络的边界。