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首页> 外文会议>Geothermal Resources Council Annual Meeting >Structural Controls of the Black Warrior Blind Geothermal System, Washoe-Churchill Counties, Truckee Range, Northwestern Nevada, USA
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Structural Controls of the Black Warrior Blind Geothermal System, Washoe-Churchill Counties, Truckee Range, Northwestern Nevada, USA

机译：黑色战士盲目地热系统，骨科丘吉尔县，大桥系列，西北地区，美国的结构控制

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摘要

The Black Warrior geothermal system lies 20 km east of the southern end of Pyramid Lake in the Truckee Range of northwestern Nevada on the Washoe-Churchill county line. It is an amagmatic blind geothermal system, as the region lacks recent (<5 Ma) volcanism and the system lacks hydrothermal surface manifestations (no fumaroles, hot springs, sinter deposits, or high temperature alteration). The system was discovered by shallow temperature gradient drilling (100-600 m, max temp: 128°C) by Phillips Petroleum Company in the 1980s and observed with a 2-m shallow temperature survey circa 2011. The thermal anomaly resides in a structurally complex zone that has not been previously characterized. Detailed geologic mapping in the area has identified faults and stratigraphic relationships between successive and interfingering Tertiary volcanic sequences that nonconformably overlie Mesozoic plutonic and metamorphic basement. The structural framework is characterized by north-northeast-striking, moderately to steeply west-dipping normal faults that terminate and step in the vicinity of the thermal anomaly. This suggests two possible favorable structural settings: (1) a fault termination of the southeastern rangefront fault with accompanying horse-tail splaying producing an area with abundant closely spaced faults and high fracture permeability; and/or (2) a fault step-over in a broad left-step of the major normal faults, whereby many closely-spaced minor faults provide hard linkage and a zone of high fracture permeability. In either case, the study area lies in a favorable structural setting for geothermal activity and may host a robust geothermal system at depth.
机译：黑色战士地热系统位于金字塔湖南端以东20公里，位于麦克丘尔县线的内华达州西北地区的Truckee系列。它是一个amagmatic盲目地热系统，因为该区域缺乏近期（<5 mA）火山，该系统缺乏水热表面表现（没有富马摩尔，温泉，烧结沉积物或高温改变）。该系统由浅温梯度钻井（100-600米，最大温度：128°C）于20世纪80年代，并观察到2011年大约2米的浅温度调查。热异常居住在结构复杂尚未表征的区域。该地区的详细地质映射已经识别出在连续和间隔的三级火山序列之间的故障和地层关系，其不可易于覆盖中生型升压和变质地下室。结构框架的特点是北 - 东北尖锐，适度地陡峭的西浸在热异常附近终止和步骤。这表明两种可能的有利结构设置：（1）东南部范围故障的故障终止与伴随着马尾次展示的面积，具有丰富的间距故障和高骨折渗透性;和/或（2）在主要正常断层的广泛左步中的故障介入，其中许多紧密间隔的次要故障提供了硬连杆和高裂缝渗透性的区域。在任何一种情况下，研究区域都位于地热活动的有利结构设置，并且可以在深度举办稳健的地热系统。

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