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首页> 外文期刊>Geothermics >Subsurface stratigraphy and its correlation with the surficial geology at Los Humeros geothermal field, eastern Trans-Mexican Volcanic Belt
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Subsurface stratigraphy and its correlation with the surficial geology at Los Humeros geothermal field, eastern Trans-Mexican Volcanic Belt

机译:跨墨西哥火山带东部Los Humeros地热田的地下地层及其与地表地质的关系

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Los Humeros is one of the main Pleistocene silicic volcanic complexes and the third geothermal field in exploitation in Mexico. It is located in the eastern sector of the Trans-Mexican Volcanic Belt (TMVB) and has a long and complex geologic evolution involving the formation of at least two large nested calderas associated with very large ignimbrite-forming eruptions during the last 0.46 Ma (Ferriz and Mahood, 1984). Due to its young activity, it has an active geothermal field (Y (a) over cap(n) over tilde ez and Garcia, 1980) producing about 65 MW. Several wells for both exploration and exploitation of geothermal fluids have been drilled in the caldera interior, showing the subsurface stratigraphy and structure of the volcanic center. A revised lithostratigraphic characterization of Los Humeros subsurface together with petrographic, geochemical and Ar-40/Ar-39-based geochronology data support correlation of rock formations at depth with surface geology. This study shows the very heterogeneous nature of the subsurface stratigraphy of Los Humeros volcanic complex, helping to refine its internal structure and evolution. This provides a more realistic configuration of the heterogeneities of the geothermal reservoir and the vertical and lateral distribution of permeable conditions controlling the configuration of the geothermal reservoir. These results can be important to guide the prospection of potential areas for the possible expansion of the geothermal field. (C) 2017 Elsevier Ltd. All rights reserved.
机译:洛斯胡梅罗斯(Los Humeros)是墨西哥更新世的主要更新世硅质火山岩之一,也是第三大地热田。它位于跨墨西哥火山带(TMVB)的东部地区,具有长期而复杂的地质演化过程,包括至少两个大的嵌套火山口的形成,以及最后一个0.46 Ma(Ferriz (Mahood,1984)。由于其年轻的活动,它有一个活跃的地热场(Y(a)覆盖在tilde ez和Garcia上的cap(n)之上,1980年),产生约65 MW功率。在火山口内部钻了几口用于勘探和开发地热流体的井,显示了火山中心的地下地层和结构。修改后的Los Humeros地下岩石地层学特征以及岩石学,地球化学和基于Ar-40 / Ar-39的年代学数据,支持了深部岩层与地表地质的相关性。这项研究显示了洛斯胡梅罗斯火山地下复杂地层的非均质性,有助于完善其内部结构和演化。这为地热储层的非均质性和控制地热储层结构的渗透条件的垂直和横向分布提供了更为现实的配置。这些结果对于指导潜在地热田扩展的潜在区域可能很重要。 (C)2017 Elsevier Ltd.保留所有权利。

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