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| 沂沭断裂带临沂段典型地热区地热资源水化学及成因机制研究 |
| Geochemical Characteristics and Genesis of Geothermal Water in Linyi Section of Yishu Fault Belt |
| 投稿时间：2026-06-12 修订日期：2026-07-17 |
| DOI： |
| 中文关键词: 地热 沂沭断裂带 水化学 热储温度 循环深度 |
| 英文关键词:Geothermal Yishu Fault Belt geochemistry geothermal reservoir temperature circulation depth |
| 基金项目:河南省重点研发专项项目“河南省低渗碳酸盐岩热储强化增产与高效采热关键技术研究与示范”（编号241111321000）、中国地质调查项目（编号DD202605202401）和水利水电规划设计总院科技项目“地热能开发利用与地球储能系统关键技术研究”（编号ZY-KJXN-20230029） |
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| 中文摘要: |
| 沂沭断裂带临沂段地热资源富集，构造与地热地质条件优越，具备良好的开发利用潜力。为揭示该区地热系统成因机制与演化规律，本文以汤头、沂南两地热区为研究对象，综合采用水文地球化学分析、地热温标计算以及同位素分析等方法，系统剖析地热流体的水-岩相互作用、补给来源、热储温度及热源供给机制。结果表明：汤头地热水为Na-Ca-Cl 型水，TDS 1960~2664 mg/L；沂南地热水为Na-Cl-SO?型水，TDS 1583~2900 mg/L。两地水化学组分均受岩石风化、阳离子交换与岩盐溶解沉淀控制。依据温标计算，汤头地热区热储温度为 87.88~101.69℃，沂南地热区热储温度为 116.35~121.05℃，相应循环深度分别为 2107~2507m 与 2930~3066m。两地热水均源自大气降水，汤头补给高程为315~900 m，推测补给来源主要为其西部/西北部海拔的中低山（如彩蒙顶、石崇崮周边山地），沂南补给高程更高1065~1422 m，推测补给来源主要为海拔更高的蒙山最高山峰龟蒙顶。两区均属于大气降水入渗补给的深循环中低温地热系统，差异主要源于补给区地形、循环路径长度及断裂构造对地热流体运移与演化的控制作用不同，沂南地热系统相对补给高程更高、循环深度更深，水岩作用与水化学演化程度更高。本研究可为沂沭断裂带临沂段地热资源的评价、勘探与可持续开发提供理论依据。 |
| 英文摘要: |
| The Linyi segment of the Yishu Fault Zone is rich in geothermal resources with superior structural and geothermal geological conditions, showing great development and utilization potential. To reveal the genetic mechanism and evolution law of the geothermal system in this area, this paper takes the Tangtou and Yinan geothermal fields as research objects, and systematically analyzes the water-rock interaction, recharge source, reservoir temperature and heat supply mechanism of geothermal fluids by using hydrogeochemical analysis, geothermometer calculation and isotope analysis. The results show that the geothermal water in Tangtou is of Na-Ca-Cl type with TDS of 1960~2664 mg/L, while that in Yinan is of Na-Cl-SO? type with TDS of 1583~2900 mg/L. The hydrochemical components of geothermal water in both areas are controlled by rock weathering, cation exchange and dissolution-precipitation of halite. According to geothermometer calculations, the reservoir temperature in Tangtou is 87.88~101.69℃ with a corresponding circulation depth of 2107~2507 m, and the reservoir temperature in Yinan is 116.35~121.05℃ with a corresponding circulation depth of 2930~3066 m. Geothermal waters in both areas are originated from atmospheric precipitation. The recharge elevation of Tangtou is 315~900 m, which is inferred to be the middle-low mountains in the west/northwest (such as around Caimengding and Shichonggu). The recharge elevation for Yinan reaches 1065–1422 m, with Guimeng Peak—the highest summit of Mengshan Mountain—as the primary recharge source. Both areas belong to deep-circulation low-medium geothermal systems recharged by atmospheric precipitation. The differences are mainly caused by the terrain of recharge areas, the length of circulation paths and the control of fault structures on the migration and evolution of geothermal fluids. The Yinan geothermal system has a relatively higher recharge elevation, deeper circulation depth, and stronger water-rock interaction and hydrochemical evolution. This study can provide a theoretical basis for the evaluation, exploration and sustainable development of geothermal resources in the Linyi segment of the Yishu Fault Zone. |
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