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首页> 外文会议>Geothermal Resources Council Annual Meeting >Comparison of a Portable Field Spectrometer and Automated Imaging on Geothermal Drill Core: A Pilot Study
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Comparison of a Portable Field Spectrometer and Automated Imaging on Geothermal Drill Core: A Pilot Study

机译：便携式场光谱仪及地热钻头核心自动成像的比较：试验研究

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Infrared reflectance spectroscopy is effective at identifying hydrothermal alteration mineralogy, which can provide information about past temperatures and fluid flow pathways that are important for geothermal exploration and assessment. Advances in hyperspectral imaging technology allow for rapid analyses and the creation of high-resolution mineral maps of geothermal drill core. We performed a pilot study on core from the Fallon FORGE EGS site (Well FOH-2) to compare portable Analytical Spectral Devices (ASD) spectral measurements with automated high-resolution imaging spectroscopy. This study focuses on Well FOH-2's Tertiary volcanic section consisting of Miocene basaltic andesite. First, we used an ASD FieldSpec Pro portable spectroradiometer that collects spectra in the VNIR/SWIR range (400 nm to 2500 nm) to collect 67 spectral measurements at approximately five-inch intervals from about 35 feet of core from four depth ranges between 2834 and 4005 feet targeting both zones of alteration and unaltered rock. Spectral data at each sampling point obtained by the ASD represent mixtures of minerals located within the instrument's 20mm diameter field of view. We compared this data with spectral maps acquired using a TerraCore Hyperspectral Core Imaging System (HCIS), with a pixel size of 1.2mm, equipped with FENIX VNIR-SWIR and OWL LWIR (8-12μm) cameras, as well as an RGB camera to create a high resolution (0.12 mm pixel size) image of the same drill core. We show that both methods are effective in identifying the dominant alteration mineralogy within the drill core, but the spectral mapping capabilities of the HCIS provide greater opportunity to evaluate spatial relationships of alteration minerals across a continuous dataset.
机译：红外反射光谱有效地识别水热改变矿物学，这可以提供关于过去的温度和流体流动途径的信息，这对于地热勘探和评估很重要。高光谱成像技术的进步允许快速分析和地热钻芯的高分辨率矿物地图的创建。我们在Fallon Forge Egs网站（FOH-2）中对核心进行了试验研究，以比较具有自动高分辨率成像光谱的便携式分析谱器件（ASD）光谱测量。本研究重点介绍了由MIOCENE玄武岩和体内岩系组成的FOH-2的第三次火山部分。首先，我们使用了ASD FieldSpec Pro便携式光谱仪，该Pro便携式分光散度计收集VNIR / SWIR范围（400nm至2500nm）中的光谱，以在2834之间的四个深度范围内的大约35英寸的核心以大约五英寸的间隔收集67个光谱测量。 4005英尺瞄准两个改变区域和未改变的岩石。由ASD获得的每个采样点处的光谱数据代表位于仪器20mm直径的视野中的矿物质的混合物。我们将该数据与使用赤篱酷斜面核心成像系统（HCIS）获取的频谱图进行了比较，像素尺寸为1.2mm，配备Fenix VNir-SWIR和OWL LWIR（8-12μm）相机，以及RGB相机创建相同钻孔芯的高分辨率（0.12毫米像素尺寸）图像。我们表明，两种方法都有效地识别钻机内的主导变化矿物学，但是HCIS的光谱映射能力提供了更多的机会，可以在连续数据集中评估改变矿物的空间关系。

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