Abstract Geophysical methods provide important help to investigate geothermal reservoirs. They permit to delineate deep and near surface structuring and to appreciate fluid circulation. In this study, we performed an integrated geophysical study using regional seismic reflection profiles and local Electrical Resistivity Tomography (ERT) data analyses to identify the relation between faults and specific geothermal pathways around Hammam Sidi Maamar thermal spring site in Hajeb Layoun area (Central Tunisia). The proposed geological model performed from seismic reflection composite sections reveals the geometry in depth series of the Lower Cretaceous from the recharge zone (Jebel Mrhila mountain) to the emergence area of Hammam Sidi Maamar (Jebel Baten Damous mountain) and traces the path of the thermal water, from its recharge area till surfacing, in order to propose a new suitable intake location with higher flow and temperature. The results of seismic and ERT data analysis confirm that the Hammam Sidi Maamar geothermal site is tectonically related to the junction of the NE-SW Baten Damous fault corridor and the NW-SE to E-W northern fault corridor of Hajeb Layoun graben. The water is charged from Lower Cretaceous (Hauterivian to Aptian) outcrop series in Jebel Mrhila Mountain to the West. It flows into the carbonate reservoir below the Hajeb Layoun-Jelma Plain, where the Lower Cretaceous reservoirs are reaching more than 2500 m deep. The reservoir geologic layers show ascent geometry towards Jebel Zaouia Mountain then they sink into the Hajeb Layoun Graben to the East. The thermal water rises to surface thanks to the deep faults that affect the Lower Cretaceous reservoir and the geologic series above. High resolution Electrical Resistivity Tomography panels, we carried out in Hammam Sidi Maamar geothermal site, allowed to locally identify the faulting architecture which controls the flow of hot water. Firstly, filtering and processing of ERT data were performed. 2D ERT modeling, mapping and 3D ERT view interpretation, were also performed to more understand the local tectonic/geothermal flow setting. Finally, to identify the prominent site for lateral and vertical geothermal flow plumes, we propose to drill 50 m–60 m intake well associated with a tectonic junction of the NE-SW Baten Damous fault corridor and the NW-SE to E-W Hajeb Layoun graben fault.

中文翻译：

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为实现可持续发展，突尼斯中部 Hammam Sidi Maamar 地热站点的地球物理研究

摘要 地球物理方法为地热储层的研究提供了重要的帮助。它们允许描绘深层和近表面结构并欣赏流体循环。在这项研究中，我们使用区域地震反射剖面和局部电阻率层析成像 (ERT) 数据分析进行了综合地球物理研究，以确定断层与 Hajeb Layoun 地区（突尼斯中部）Hammam Sidi Maamar 温泉遗址周围特定地热通道之间的关系. 从地震反射复合剖面执行的拟议地质模型揭示了下白垩纪从补给带（杰贝尔姆希拉山）到哈曼西迪马马尔（杰贝尔巴腾达穆斯山）出现区域的深度系列几何形状，并追踪了热流的路径水，从补给区到浮出水面，为了提出具有更高流量和温度的新的合适的进气位置。地震和 ERT 数据分析的结果证实，Hammam Sidi Maamar 地热站点在构造上与 NE-SW Baten Damous 断层带和 Hajeb Layoun 地堑的 NW-SE 到 EW 北断层带的交汇处有关。水从杰贝尔姆希拉山的下白垩纪（Hauterivian 到 Aptian）露头系列向西注入。它流入 Hajeb Layoun-Jelma 平原下方的碳酸盐岩储层，下白垩统储层深度超过 2500 m。储层地质层显示出向 Jebel Zaouia 山上升的几何形状，然后沉入东面的 Hajeb Layoun Graben。由于影响下白垩统储层和上面的地质系列的深断层，热水上升到地表。我们在 Hammam Sidi Maamar 地热站点进行了高分辨率电阻率层析成像面板，可以在本地识别控制热水流动的断层结构。首先，对ERT数据进行过滤和处理。还执行了 2D ERT 建模、制图和 3D ERT 视图解释，以更好地了解当地构造/地热流设置。最后，为了确定侧向和垂直地热流羽流的显着位置，我们建议钻 50 m-60 m 与 NE-SW Baten Damous 断层带和 NW-SE 至 EW Hajeb Layoun 地堑的构造交汇处相关的吸入井过错。我们在 Hammam Sidi Maamar 地热站点进行了高分辨率电阻率层析成像面板，可以在本地识别控制热水流动的断层结构。首先，对ERT数据进行过滤和处理。还执行了 2D ERT 建模、制图和 3D ERT 视图解释，以更好地了解当地构造/地热流设置。最后，为了确定侧向和垂直地热流羽流的显着位置，我们建议钻 50 m-60 m 与 NE-SW Baten Damous 断层带和 NW-SE 至 EW Hajeb Layoun 地堑的构造交汇处相关的吸入井过错。我们在 Hammam Sidi Maamar 地热站点进行了高分辨率电阻率层析成像面板，可以在本地识别控制热水流动的断层结构。首先，对ERT数据进行过滤和处理。还执行了 2D ERT 建模、制图和 3D ERT 视图解释，以更好地了解当地构造/地热流设置。最后，为了确定侧向和垂直地热流羽流的显着位置，我们建议钻 50 m-60 m 与 NE-SW Baten Damous 断层带和 NW-SE 至 EW Hajeb Layoun 地堑的构造交汇处相关的吸入井过错。对 ERT 数据进行过滤和处理。还执行了 2D ERT 建模、制图和 3D ERT 视图解释，以更好地了解当地构造/地热流设置。最后，为了确定侧向和垂直地热流羽流的显着位置，我们建议钻 50 m-60 m 与 NE-SW Baten Damous 断层带和 NW-SE 至 EW Hajeb Layoun 地堑的构造交汇处相关的吸入井过错。对 ERT 数据进行过滤和处理。还执行了 2D ERT 建模、制图和 3D ERT 视图解释，以更好地了解当地构造/地热流设置。最后，为了确定侧向和垂直地热流羽流的显着位置，我们建议钻 50 m-60 m 与 NE-SW Baten Damous 断层带和 NW-SE 至 EW Hajeb Layoun 地堑的构造交汇处相关的吸入井过错。