Abstract：
Porous sandstone geothermal water is an important geothermal resource, which is a low-carbon and clean resource, but lacks systematic research on a regional scale. The northern part of Jinan City is rich in geothermal resources, specifically porous sandstone thermal reservoirs. However, there is still incomplete research on the mechanism of geothermal genesis and the hydrochemical characteristics of geothermal water in porous sandstone. This study aims to address this gap by collecting 21 groundwater samples from northern Jinan and comparing their conventional ion and isotope characteristics to investigate the hydrochemical characteristics during the formation of geothermal water and uncover the genesis mechanism of porous sandstone geothermal water. The results indicate that the geothermal water is classified as Na-Cl type and Na-SO4-Cl type. The hydrochemical characteristics of geothermal water are primarily influenced by water-rock interaction and groundwater mixing. The water source primarily comes from the atmospheric precipitation in the Taiyi mountains, with an altitude of 910.75-1542.2 m.s.a.l.. The estimated temperature of the thermal reservoir ranges from 51 to 78 °C, and the depth of geothermal water circulation is estimated to be between 1316 and 2216 m. Based on the characteristics of the geothermal field, including the \"cap rock, water source, heat source, reservoir, and channel,\" a conceptual model of the porous sandstone geothermal water flow system is proposed. This model offers novel insights into the genesis mechanism of geothermal water under similar geological conditions.
摘要：
多孔砂岩地热水是一种重要的地热资源,这是一种低碳清洁的资源，但缺乏区域范围内的系统研究。济南市北部地热资源丰富,特别是多孔砂岩热储层。然而,关于多孔砂岩中地热成因机制和地热水水化学特征的研究还不完全。本研究旨在通过收集济南北部的21个地下水样品，并比较其常规离子和同位素特征，研究地热水形成过程中的水化学特征，揭示多孔砂岩地热水的成因机制。结果表明，地热水分为Na-Cl型和Na-SO4-Cl型。地热水的水化学特征主要受水-岩相互作用和地下水混合的影响。水源主要来自太一山的大气降水，海拔910.75-1542.2m.s.a.l..储热器的估计温度范围为51至78°C，地热水循环深度估计在1316至2216m之间。根据地热田的特征，包括“盖帽岩”，水源,热源,水库,和频道，“提出了多孔砂岩地热水流动系统的概念模型。该模型为类似地质条件下地热水的成因机制提供了新的见解。
