The interest on low‐temperature geothermal resources is progressively increasing since their renewability and widespread availability. Despite their frequency, these resources and their development have been only partially investigated. This paper unravels the major physical processes driving a low‐temperature geothermal resource in NE Italy (Euganean Geothermal System) through conceptual and numerical modeling. Dense fracturing associated to regional fault zones and a relay ramp enhances regional to local flow of thermal waters. Their rapid upwelling in the Euganean Geothermal Field is favored by open extensional fractures deforming the relay ramp. The water (65–86 °C) is intensively exploited for balneotherapy, rendering it a profitable resource. Three‐dimensional coupled flow and heat transport numerical simulations based on this conceptual model are performed. Despite the presence of a uniform basal heat flow, a thermal anomaly corresponding to field observations develops in the modeling domain reproducing the relay ramp. Intensive fracturing extending across a wide area and a slightly anomalous heat flow favors a local increase in convection that drives the upwelling of deep‐seated hot waters. The simulations corroborate and refine the conceptual model, revealing that water of up to 115 °C is likely to be found in the unexplored part of the thermal field. This study furthers knowledge on fault‐controlled low‐temperature geothermal resources where the geological setting could enhance local convection without anomalous heat flows, creating temperatures favorable for energy production. Conceptual and numerical modeling based on solid geological and hydrogeological reconstructions can offer a support tool for further detailed explorations of these prominent resources.

中文翻译：

---

热异常的故障控制：南部阿尔卑斯山前陆盆地（意大利东北）的低温地热系统的概念和数值模型

由于低温地热资源具有可再生性和广泛的可利用性，因此人们对其的兴趣正逐步增加。尽管它们的频率很高，但仅对这些资源及其开发进行了部分调查。本文通过概念和数值模型，揭示了驱动意大利东北部（Euganean地热系统）低温地热资源的主要物理过程。与区域断层带和中继斜坡相关的致密压裂增强了热水的区域到局部流动。它们在Euganean地热田中迅速上升，这是由于开放的伸展性裂缝使中继坡变形而形成的。水（65–86°C）被大量开发用于疗法，使其成为有利可图的资源。在此概念模型的基础上进行了三维耦合流动和热传递数值模拟。尽管存在均匀的基础热流，但在模拟域中仍会出现与野外观测相对应的热异常，从而再现了继电器斜坡。强烈的裂缝遍布大面积区域，热流略有异常，有利于局部对流增加，从而推动深层热水上升。这些模拟证实并完善了概念模型，表明在未开发的热场中可能会发现高达115°C的水。这项研究进一步了解了由断层控制的低温地热资源，其地质环境可以在没有异常热流的情况下增强局部对流，从而产生有利于能源生产的温度。