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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Physical and hydraulic properties of modern sinter deposits: El Tatio, Atacama
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Physical and hydraulic properties of modern sinter deposits: El Tatio, Atacama

机译：现代烧结矿的物理和水力学性质：阿塔卡马州的El Tatio

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Sinters are siliceous, sedimentary deposits that form in geothermal areas. Formation occurs in two steps. Hot water circulates in the subsurface and dissolves silica from the host rock, usually rhyolites. Silica then precipitates after hot water is discharged and cools. Extensive sinter formations are linked to up-flow areas of fluids originating from high temperature (>175 degrees C) deep reservoirs. Fluid geochemistry, microbial communities, and environmental conditions of deposition determine the texture of sinter and pore framework. Porosity strongly influences physical and hydraulic properties of rocks. To better understand the properties controlling the transport of fluids, and interpret geophysical observations in geothermal systems, we studied 17 samples of modern geyserite sinter deposits (<10 ka) from the active El Tatio geothermal field in northern Chile. We measured the physical properties (hydraulic, seismic, and electrical), and internal microstructure (using mu X-Ray computed tomography). We find that the pore structure, and thus hydraulic and physical properties, is controlled by the distribution of microbial matter. Based on velocity-porosity relationships, permeability-porosity scaling, and image analysis of the 3D pore structure; we find that the physical and hydraulic properties of sinter more closely resemble those of vesicular volcanic rocks and other material formed by precipitation in geothermal settings (i.e., travertine) than clastic sedimentary rocks. (C) 2016 Elsevier B.V. All rights reserved.
机译：烧结矿是在地热区形成的硅质沉积物。形成分两个步骤进行。热水在地下循环，并溶解宿主岩中的二氧化硅，通常是流纹岩。然后，排出热水并冷却后，二氧化硅沉淀。大量的烧结物与来自高温（> 175摄氏度）深层储层的流体上流区域有关。流体地球化学，微生物群落和沉积的环境条件决定了烧结矿和孔隙结构的质地。孔隙度强烈影响岩石的物理和水力性质。为了更好地理解控制流体传输的特性，并解释地热系统中的地球物理观测结果，我们研究了智利北部活跃的El Tatio地热田的17个现代石膏矿烧结矿（<10 ka）样品。我们测量了物理特性（液压，地震和电学特性）和内部微观结构（使用mu X射线计算机断层扫描）。我们发现，孔隙结构以及由此的水硬性和物理性质受微生物物质的分布控制。基于速度-孔隙率关系，渗透率-孔隙率缩放和3D孔隙结构的图像分析；我们发现，与碎屑沉积岩相比，烧结矿的物理和水力学性质与地热环境（即钙华）中沉淀形成的水泡火山岩和其他物质更相似。 （C）2016 Elsevier B.V.保留所有权利。

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