Western Saudi Arabia is a promising area for geothermal energy exploration. Its geothermal wealth is attributed to the ongoing Red Sea rift evolution and crust thinning. Several hot springs in the region indicate the presence of potential geothermal resources. The present study aimed to characterize the geothermal system of a hot spring in the region, in the area of Wadi Al Lith, where water temperature exceeds 80 °C at the surface. For this, we used aeromagnetic data from the Saudi Geological Survey. We also collected a ground magnetic gradient data profile near the hot spring. To delineate structures of interest and map the distribution of volcanic rocks and tectonic lineaments, data enhancement filters were applied to the aeromagnetic data. These data were also subjected to spectral analysis to determine the depth of the Curie isotherm, which was then used to estimate a 1D geothermal model and predict the heat flow in the study area. According to the results of the spectral analysis of aeromagnetic data, the depth of the Curie temperature isotherm was about 14.8 km. The estimated depth was validated by deep magnetotelluric soundings, which revealed a clear decrease in resistivity at the same depth level. A constrained 1D geothermal model with three different layers (upper crust, lower crust, and mantle) was constructed. The depth of the Curie isotherm and the depth to the lithosphere's base were among the constraints. Furthermore, published data were used to define the radiogenic heat production within the crust and mantle and the corresponding thermal conductivity and thickness of each layer. According to the 1D geothermal modeling results, the average heat flow of the area reaches 109.8 mW/m², indicating potential geothermal resources. The findings of this study can be used to design a drilling program that will provide detailed information on reservoir parameters and put the geothermal resources into production.

沙特阿拉伯西部是地热能勘探前景广阔的地区。其地热财富归因于正在进行的红海裂谷演化和地壳减薄。该地区的几个温泉表明存在潜在的地热资源。本研究旨在描述该地区 Wadi Al Lith 地区温泉的地热系统特征，该地区地表水温超过 80 °C。为此，我们使用了沙特地质调查局的航磁数据。我们还收集了温泉附近的地面磁梯度数据剖面。为了描绘感兴趣的结构并绘制火山岩和构造轮廓的分布图，对航磁数据应用了数据增强滤波器。这些数据还经过光谱分析以确定居里等温线的深度，然后用于估计一维地热模型并预测研究区域的热流。根据航磁数据频谱分析结果，居里温度等温线深度约为14.8公里。估计的深度通过深部大地电磁测深进行了验证，结果显示同一深度水平的电阻率明显下降。构建了具有三个不同层（上地壳、下地壳和地幔）的约束一维地热模型。居里等温线的深度和岩石圈底部的深度是限制因素。此外，已发表的数据用于定义地壳和地幔内的放射热产生以及相应的热导率和每层的厚度。根据一维地热模拟结果，该区域平均热流达到109.8 mW/m ² ，具有潜在的地热资源。 这项研究的结果可用于设计钻探计划，提供有关储层参数的详细信息并将地热资源投入生产。