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山东省菏泽凸起地热田岩溶地热水水化学水平演化特征
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引用本文:史启朋,宋帅良,孟甲,郑慧铭.山东省菏泽凸起地热田岩溶地热水水化学水平演化特征[J].中国岩溶,2021,(2):310-318. SHI Qipeng,SONG Shuailiang,MENG Jia,ZHENG Huiming.Hydrochemical evolution of karst geothermal water in the Heze uplift geothermal field, Shandong Province[J].Carsologica Sinica,2021,(2):310-318.
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史启朋 山东省鲁南地质工程勘察院(山东省地勘局第二地质大队)/山东省地热清洁能源勘查开发工程研究中心 
宋帅良 山东省鲁南地质工程勘察院(山东省地勘局第二地质大队)/山东省地热清洁能源勘查开发工程研究中心 
孟甲 山东省鲁南地质工程勘察院(山东省地勘局第二地质大队) 
郑慧铭 山东省鲁南地质工程勘察院(山东省地勘局第二地质大队) 
基金项目:山东省中央引导地方科技发展资金项目(YDZX20203700002937);国家自然科学基金项目(U1906209);山东省地矿局地勘项目[鲁地字(2018)13号]
中文摘要:在前人研究成果的基础上,选择A-A′和B-B′两条路径,采用Piper三线图解、Schoeller图解、Na-K-Mg平衡图解、饱和指数计算评价等方法,研究山东菏泽凸起地热田地热水沿路径上的循环演化特征。结果表明:沿A-A′、B-B′剖面岩溶冷水→岩溶热水,水化学类型由SO4.HCO3-Ca.Mg.Na或SO4.HCO3-Ca.Mg向SO4-Ca.Na或SO4-Ca演化,矿化度逐渐增大,HCO3-浓度逐渐减少,SO42-、Ca2+、K+浓度逐渐增大,反映出岩溶冷水向岩溶热水演化的补给特征;水化学三线图上岩溶冷水、热水处在不同的区域,显示岩溶冷水向岩溶热水演化补给;距补给区由近到远,水岩作用程度逐步提高,饱和指数逐渐增大,岩溶地热水溶滤作用增强。
中文关键词:菏泽凸起地热田  岩溶地热水  水—岩作用  水化学特征
 
Hydrochemical evolution of karst geothermal water in the Heze uplift geothermal field, Shandong Province
Abstract:The Heze uplift geothermal field is located in the tectonic unit of the buried uplift, Heze-Yanzhou buried fault uplift, Heze buried uplift, with a total area 6,330 km2. It hosts Ordovician crack karst thermal reservoirs of layering zone-like shape, with water yield of 80-402 m3.h-1 in single wells, depths of water level 20-55 m and wellhead temperatures 45-75 ℃.The thermal reservoir caprocks are Quaternary, Neogene and Permian-Carboniferous with a thickness of 600-2,500 m.Deep faults such as the Liaokao,Juye,Tianqiao and Fushan faults connect heat sources at depth, forming heat source channels. Secondary faults of these major deep faults developed well, nearby which limestone has undergone many tectonic movements and dissolution, resulting in the development of fissure karst which is the circulation, migration channel and water storage space of deep karst hot water as well as the main water source channel.The purpose of this work was to study the evolution characteristics of hydrochemistry of geothermal water.Two sections A-A′ and B-B′ were selected in the geothermal field.Piper,Schoeller and Na-K-Mg equilibrium diagrams and saturation index calculation were used to characterize the distribution and evolution of each chemical index in geothermal water. Results show that along the profiles A-A′ and B-B′, karst water turns from cold into hot, the hydrochemical type evolves from SO4·HCO3-Ca·Mg·Na or SO4·HCO3-Ca·Mg to SO4-Ca·Na and SO4-Ca. Mineralization increases gradually, HCO3-concentration decreases gradually, and SO42-, Ca2+ and K+ concentrations grow gradually. It reflects the evolution and supply characteristics of karst cold water to karst hot water. The karst cold water and hot water samples are located in different areas on the hydrogeochemical trilinear map, which shows that the cold water is supplied to the hot water. With distance supply area from near to far from the supply area, the degree of water rock interaction gradually intensifies, the saturation index gradually increases, and dissolution of karst hot water gradually becomes larger.
keywords:Heze uplift geothermal field, karst geothermal water, water rock interaction, hydrochemical characteristics
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