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首页> 外文会议>Geothermal Resources Council Annual Meeting >Hyperspectral Mineral Mapping in Support of Geothermal Exploration: Examples from Long Valley Caldera, CA and Dixie Valley, NV, USA
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Hyperspectral Mineral Mapping in Support of Geothermal Exploration: Examples from Long Valley Caldera, CA and Dixie Valley, NV, USA

机译：高光谱矿物绘图支持地热勘探：来自美国高山的长谷Caldera，CA和Dixie Valley的例子

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Growing interest and exploration dollars within the geothermal sector have paved the way for increasingly sophisticated suites of geophysical and geochemical tools and methodologies. The efforts to characterize and assess known geothermal fields and find new, previously unknown resources has been aided by the advent of higher spatial resolution airborne geophysics (e.g. aeromagnetics), development of new seismic processing techniques, and the genesis of modern multi-dimensional fluid flow and structural modeling algorithms, just to name a few. One of the newest techniques on the scene, is hyperspectral imaging. Really an optical analytical geochemical tool, hyperspectral imagers (or imaging spectrometers as they are also called), are generally flown at medium to high altitudes aboard mid-sized aircraft and much in the same way more familiar geophysics are flown. The hyperspectral data records a continuous spatial record of the earth's surface, as well as measuring a continuous spectral record of reflected sunlight or emitted thermal radiation. This high fidelity, uninterrupted spatial and spectral record allows for accurate material distribution mapping and quantitative identification at the pixel to sub-pixel level. In volcanic/geothermal regions, this capability translates to synoptic, high spatial resolution, large-area mineral maps generated at time scales conducive to both the faster pace of the exploration and drilling managers, as well as to the slower pace of geologists and other researchers trying to understand the geothermal system over the long run. Two sites in the western U.S. are used to demonstrate the utility of hyperspectral surveys for geothermal site characterization and exploration. Extensive hyperspectral studies in Long Valley Caldera in central-eastern California has provided a template for subsequent hyperspectrally-driven geothermal system assessments (Figure 1B). Fault mapping, discharge zone delineation, gross hydrothermal circulation patterns, general hydrothermal system geochemical character and temperatures are gleaned from the hyperspectral data. The combination of hyperspectral data with other geophysical and geochemical datasets serves to both test hyperspectral's capabilities for geothermal system characterization and to combine with and build on the information and modes gleaned from other datasets. The goal is to extend hyperspectral data and techniques into other geothermal regions both at the production and prospect level. Such an incursion has begun in central Nevada, just to the south of the Dixie Valley geothermal field, in a locale referred to as Dixie Meadows (Figure 1B). It is hoped that the level of mapping and characterization success reached in Long Valley, is possible at Dixie Meadows.
机译：地热部门的日益增长的兴趣和勘探美元为地球物理和地球化学工具和方法越来越复杂的套房铺平了道路。在较高的空间分辨率空气机地球物理（例如Aeromagnics），新地震加工技术的发展以及现代多维流体流动的成因，辅助表征和评估知名地热场的表征和评估新的，以前未知的资源。和结构建模算法，只是为了命名几个。场景中最新的技术之一是高光谱成像。真的是一种光学分析地球化学工具，高光谱成像器（或也称为也称为它们的成像光谱仪），通常在中型飞机中以媒体飞到高海拔，并且与飞行的更多熟悉的地球物理学都是相同的。高光谱数据记录地球表面的连续空间记录，以及测量反射阳光或发射的热辐射的连续光谱记录。这种高保真，不间断的空间和光谱记录允许在像素到子像素级别的准确材料分布映射和定量识别。在火山/地热处理中，这种能力转化为略微，高空间分辨率，大面积矿物地图，在利用勘探和钻探管理人员的速度更快，以及地质学家和其他研究人员的速度较慢试图长期了解地热系统。美国西部的两个位点用于展示高光谱调查对地热场地表征和勘探的效用。在加利福尼亚州中心东部的长谷火山口的广泛高光谱研究为随后的高音光滑驱动的地热系统评估提供了一种模板（图1B）。故障映射，放电区描绘，加氢热循环模式，一般热热系统地球化学特征和温度从高光谱数据收集。 Hyperspectral数据与其他地球化学和地球化学数据集的组合用于测试高光谱的地热系统表征的能力，并与其他数据集收集的信息和模式相结合并构建。目标是将高光谱数据和技术扩展到生产和前景水平的其他地热处理中。在内华达州中部，在迪克西谷地热场南部的地区，在内华达州的南部，在称为Dixie Meadows（图1B）的区域内，这种侵略已经开始。希望在长谷达到长谷的映射和表征成功的水平，是在Dixie Meadows中的可能性。

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