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首页> 外文会议>Geothermal Resources Council Annual Meeting Expo >Using 3D gravity inversion modeling to iteratively refine 3D geologic maps: The Nevada Play-fairway project, Southern Gabbs Valley, Nevada
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Using 3D gravity inversion modeling to iteratively refine 3D geologic maps: The Nevada Play-fairway project, Southern Gabbs Valley, Nevada

机译：使用3D重力反转模型迭代完善3D地质地图：内华达州南方山谷南方山谷的内华达剧场

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Southern Gabbs Valley in western Nevada emerged as a particularly promising geothermal prospect from Phase 1 research for the Nevada Play Fairway Project, a project focused on regional-scale geothermal exploration in the Great Basin, Nevada, USA. Subsequently in Phase 2, detailed geologic mapping and this 3D geologic analyses were conducted and high-resolution gravity, magnetic, and magnetotelluric data were collected, in order to identify the specific areas that were most likely to host geothermal activity. Six temperature gradient wells were ultimately sited based on these analyses and were drilled in May 2018. Hot (114.4°C and 124.9°C) equilibrated temperatures at ～150 m depth and convective gradients were measured in two of these wells, confirming the presence of a blind hydrothermal system in southern Gabbs Valley. Continued exploration of this promising prospect necessitates a detailed understand of the complex 3D architecture of the local fault system and geologic section in order to understand the deeper hydrothermal system. Building upon detailed 2D geologic mapping and geologic cross sections, interpretation of gravity and magnetic anomalies, gravity and magnetic maximum horizontal gradient maps, and 2D profile modeling of gravity and magnetic data, we construct a 3D geologic map of southern Gabbs Valley. 3D gravity inversion modeling is employed to refine the 3D geologic map and to evaluate the 3D map and constrain the 'uncertainty space' i.e., the range of 3D geologic interpretations that are permissible given the existing data. As is the case in early exploration in many 'greenfield' geothermal prospects, deep subsurface data are absent at southern Gabbs Valley, so this study represents a 3D, data- and hypothesis-driven method for geological characterization and geophysical interpretation during early exploration that can be applied to other blind geothermal prospects. The resulting subsurface map can be used to guide, and be refined by, addition exploration efforts.
机译：内华达州西部的南加布斯山谷被出现为Nevada Play Fairway项目第1阶段研究的一个特别有前景的地热前景，该项目专注于美国内华达州内华达州伟大的盆地区域规模地热勘探。随后在阶段2中，进行了详细的地质映射和该3D地质分析，并且收集了高分辨率重力，磁性和磁识别数据，以识别最有可能占地热活动的特定区域。最终基于这些分析最终突出了六个温度梯度孔，并于2018年5月钻探。在其中两台孔中测量热（114.4°C和124.9°C）在〜150米深度和对流梯度的平衡温度下测量，确认存在南方加布姆斯山谷的盲热系统。继续探索这一有希望的前景需要详细了解本地故障系统和地质部分的复杂3D架构，以了解更深的水热系统。建立在详细的2D地质映射和地质横截面上，重力和磁性异常的解释，重力和磁性最大水平梯度图，以及重力和磁数据的2D型材建模，我们构建了南方加布巴斯山谷的3D地质地图。 3D重力反转建模用于优化3D地质地图并评估3D地图并限制“不确定性空间”即，给定现有数据允许的3D地质解释的范围。与早期探索在许多“格林菲尔德”的地热前景中，南方加布巴斯山谷的深度地下数据，因此该研究代表了在早期探索期间的地质特征和地球物理解释的3D，数据和假设驱动方法适用于其他盲目地热前景。得到的地下贴图可用于引导，并通过添加勘探工作来引导。

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