| 刘 森,侯才庆,张繁荣.甘肃天水皂郊地热田地热水同位素及化学特征[J].甘肃地质,2026,35(1):81-87 |
| 甘肃天水皂郊地热田地热水同位素及化学特征 |
| ISOTOPIC AND CHEMICAL CHARACTERISTICS OF GEOTHERMAL WATER IN THE ZAOJIAO GEOTHERMAL FIELD,TIANSHUI, GANSU PROVINCE |
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| DOI：10.27027/j.cnki.ISSN2097-6704.2026.01.010 |
| 中文关键词: 隆起山地型地热田 地热水 同位素特征 热流体运移 天水皂郊 |
| 英文关键词:geothermal field in uplifted mountainous region geothermal water isotopic and hydrochemical characteristics Zaojiao geothermal field Gansu Province |
| 基金项目:甘肃省天水市秦州区皂郊镇地热资源普查项目（202004-M02）。 |
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| 中文摘要: |
| 地热资源作为一种清洁能源和可再生能源，在能源供应、环境保护、产业发展等领域都展现出独特价值。地热水化学特征和同位素特征是阐明地热田地热水成因机制的关键指标。 本文通过对比分析甘肃天水皂郊地热田ZK1井内热流体及钻孔附近不同深度地下水水化学特征，揭示皂郊地热田热流体赋存特征及热水来源。 研究表明该地热田在1 069. 3 ~ 1 288. 3 m内地下水均来自大气降雨及由大气降水形成的地表水入渗补给。 ZK1井热流体δD（-83）、δ18
O（-11. 9）、14C（3. 00 ± 0. 79）、3H（ ＜ 1.0）均小于95-2井基岩裂隙水同位素含量，说明区内浅表层、中深层、深层地下水之间并无水力联系，且不同深度流体年龄与其深度正相关，深度越大，流体年龄越大。 皂郊地热田ZK1井内热流体是沿西秦岭北缘断裂带运移和赋存的断裂带脉状水，热流体循环深度大、运移路径较长、流速缓，在深循环过程中发生了较充分的水岩作用以及热能交换。 |
| 英文摘要: |
| Geothermal resources, as a kind of clean and renewable energy, show unique value in the fields of energy supply, environmental protection, and industrial development. The chemical and isotopic characteristics of geothermal water are the key indicators to elucidate the genesis mechanism of geothermal water in geothermal fields. In this paper, we compare and analyze the hydrochemical characteristics of thermal fluids in the ZK1 well and groundwater at different depths near the borehole in the Zaojiao geothermal field in Tianshui, Gansu Province, in order to reveal the characteristics of the thermal fluids in the Zaojiao geothermal field and the source of the hot water. The study shows that the groundwater in the field from 1 069.3 m to 1 288.3 m is recharged by atmospheric rainfall and infiltration of surface water formed by atmospheric precipitation, and the isotopic contents of ZK1 well, 95-2 well and bedrock fissure water are analyzed, and the δD（-83）, δ18O（-11.9）, 14C（3.00± 0.79）, and 3H（ < 1.0） of the hot fluid in ZK1 well are smaller than those in 95-2 well. All of them are smallerthan the isotope content of well 95-2 and bedrock fissure water, indicating that there is no hydraulic connection between the superficial, middle-depth and deep groundwater in the area, and the age of fluids at different depths is positively correlated with their depths, and the greater the depth, the greater the age of the fluids. The thermal fluid in the ZK1 well of the Zaojiao Geothermal Field is a fracture zone vein water transported and stored along the fracture zone of the northern edge of the West Qinling Mountains, and the thermal fluid has a large circulating depth, a long transport path, and a slow flow rate, so that a fuller water-rock interaction as well as a heat energy exchange have occurred in the deep circulation process. |
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