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首页> 外文会议>Geothermal Resources Council annual meeting >New Geoscientific Developments at the Utah Frontier Observatory for Research in Geothermal Energy (FORGE) Site
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New Geoscientific Developments at the Utah Frontier Observatory for Research in Geothermal Energy (FORGE) Site

机译：犹他州地热能研究前沿观测站的地球科学新进展

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The EGS reservoir at the Utah FORGE site is entirely hosted in fractured Tertiary granitoid that forms the stratigraphic basement in the north Milford valley. These reservoir rocks are part of a pluton exposed throughout the core of the nearby Mineral Mountains. The top of basement is defined by a gentle west-dipping surface that represents a rotated Basin and Range fault. Beneath the FORGE site, 3000 ft of alluvial basin fill covers the plutonic rocks. This report focuses on new results that validate the stratigraphic relationships and the geometry of the basement structure, and the shallow groundwater system. These assessments are based on analysis of drill cuttings and testing of two new seismic monitoring holes (1000' and 3000' deep). Supporting information come from reprocessing and interpretation of 3D seismic data obtained in 2017, and the sampling and analysis of undisturbed groundwater obtained from OH4, a nearby legacy well. The alluvium deposits consist of poorly sorted and poorly lithified sands and gravels made of quartz and feldspar eroded from the plutonic rocks in the Mineral Mountains. These strata strongly resemble fan deposits on the surface and show no evidence of hydrothermal alteration. Aquifer testing proves adequate supply of benign non-potable water that originated as outflow from the Roosevelt Hot Springs. The seismic reflection results support earlier interpretations that the basement contact lacks any major disruptions or discontinuities that might result from offsets on subvertical faults.
机译：犹他州FORGE站点的EGS油藏完全由裂缝性第三纪花岗岩构成，该第三纪花岗岩形成了北米尔福德谷地层的地层基底。这些储层岩石是整个邻近矿山核心暴露的岩体的一部分。地下室的顶部由平缓的西倾面定义，代表旋转的盆地和山脉断层。在FORGE站点下方，3000英尺的冲积盆地填充物覆盖了深成岩。该报告的重点是新的结果，这些结果验证了地层结构和地下结构以及浅层地下水系统的几何关系。这些评估基于钻屑的分析和两个新地震监测孔（深度为1000'和3000'）的测试。支持信息来自2017年获得的3D地震数据的重新处理和解释，以及来自附近老井OH4的未扰动地下水的采样和分析。冲积物沉积物是由矿物山中的深成岩侵蚀掉的石英和长石制成的分类不善，不易石化的沙子和砾石组成的。这些地层非常类似于表面上的扇形沉积物，并且没有显示出热液蚀变的迹象。含水层测试证明有足够的良性非饮用水供应，其源于罗斯福温泉的流出。地震反射的结果支持了较早的解释，即地下接触没有任何可能因垂直断裂上的偏移而引起的重大破坏或不连续性。

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