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首页> 外文会议>Geothermal Resources Council Annual Meeting >Targeting of Potential Geothermal Resources in the Great Basin from Regional to Basin-Scale Relationships Between Geodetic Strain and Geological Structures
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Targeting of Potential Geothermal Resources in the Great Basin from Regional to Basin-Scale Relationships Between Geodetic Strain and Geological Structures

机译：从区域到地理位置应变与地质结构之间的大盆地潜在地热资源的定位

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We apply a new method to target potential geothermal resources on the regional scale in the Great Basin by seeking relationships between geologic structures and GPS-geodetic observations of regional tectonic strain. First, we establish a theoretical basis for understanding how the rate of fracture opening can be related to the directional trend of faults within the regional-scale strain field. Second, we develop a strain-structure methodology that uses a digitized database of Quaternary fault strikes and velocities of GPS stations. Results of our strain-structure analysis on the regional scale show a spatial relationship between known geothermal activity and (1) change in the direction of fault orientations, (2) change in the direction of extensional strain, and (3) the magnitude of extensional strain, especially fault-normal extension associated with shear strain. In contrast, the dilitation component of strain is not a significant indicator of geothermal activity in the Great Basin. Using the observed relationships between strain and structure, the NE-SW trending Humboldt structural zone (HSZ) in north-eastern Nevada is clearly identifiable as a regional geothermal target. Based on our detection of an anomalous high in fault-normal extensional strain, we identify Buffalo Valley toward the NE extent of the HSZ as a potential geothermal target to be further explored using GPS. We therefore recommend investigating Buffalo Valley with fine spatial resolution (～10 km rather than the current ～100 km) using a dense GPS network to assess its geothermal potential, by comparison of strain-structure relationships with current power-producing areas within the HSZ.
机译：通过寻求地质结构与区域构造菌株的地理位置与GPS-eodetic观察之间的关系，我们将潜在地热资源应用于大盆地区域规模的新方法。首先，我们为了解骨折开口率如何与区域规模应变场内的故障定向趋势有关的理论依据。其次，我们开发了一种应变结构方法，该方法使用数字化数据库的四元故障击球和GPS站的速度。对区域规模的应变结构分析结果显示了已知地热活动与（1）在故障方向方向变化之间的空间关系，（2）在延伸应变方向上变化，（3）延伸的幅度应变，特别是与剪切应变相关的故障正常延伸。相比之下，菌株的膨胀组分不是大盆地地热活动的重要指标。利用应变与结构之间的观察到的关系，内华达州东北地区的Ne-SW趋势Humboldt结构区（HSZ）明显可识别为区域地热目标。基于我们对故障正常延伸应变中的异常高的检测，我们将水牛谷朝向HSZ的网元范围，作为使用GPS进一步探索的潜在地热目标。因此，我们建议使用密集的GPS网络调查水牛谷（〜10km而不是当前〜100km），以通过与HSZ内的电流发电区域的应变结构关系进行比较来评估其地热势。

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