Chemical characteristics and causes analysis of the geothermal fluid in Huaiyang County, Henan Province
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摘要:
研究目的 淮阳地热属于典型的中低温沉降盆地型地热,研究淮阳县地热资源的质与量,有助于其合理开发利用及科学管理。
研究方法 本文综合利用地球化学、环境同位素,对淮阳县地温场及地热流体化学特征和成因进行分析研究。
研究结果 结果表明,深部热储地温场受基底构造与断裂影响较明显,构造单元分界处和多条断裂交汇处,地温梯度较高,如苏庄地温梯度3.75℃/100 m,其他地段 < 3.5℃/100 m。研究区内地热流体中主要为Cl·HCO3·SO4-Na、Cl·SO4·HCO3-Na、Cl·SO4-Na型。地热流体中阳离子主要以Na+为主,阴离子呈多样化,研究区地热流体主要来源于西部伏牛山区的大气降水,且地热流体发生水-岩作用,但相对较弱。地热流体为1952年前入渗补给的“古水”。
结论 淮阳经济可开采热储层主要为新近系明化镇组和馆陶组,区内地热资源开发主要可用来供暖,以促进当地经济发展,助力于本地区“双碳”目标的达成。
Abstract:This paper is result of geothermal geological survey engineering
Objective Geothermal resource in Huaiyang area belongs typical medium- low temperature geothermal resource of subsidence basin. Evaluation of geothermal resources in the Huaiyang area can provide insights into its exploitation and scientific management.
Methods In this paper, we analyzed the geochemical and isotopes characteristics of geothermal fluids to explore their local geothermal field features and genesis.
Results The results show that the deep thermal reservoirs are significantly affected by basement structure and faults characteristics. The geothermal gradient is higher (e.g., 3.75℃/100m in the Suzhuang area) along the boundary of faults than the other areas (e.g., 3.5℃/100m). The type of the geothermal fluids are dominated by Cl · HCO3 · SO4-Na, Cl·SO4·HCO3-Na and Cl·SO4-Na. The main cation of the geothermal fluid is Na+ while the anions variou in types. The geothermal fluids were probably derived from the atmospheric "ancient water" of the Funiu Mountain in the western Henan province before 1952, with relatively weak rock-fluid reaction.
Conclusions The major exploited geothermal reservoirs are placed at the Neogene Minghuazhen and Guantao Formations. The geothermal resources are mainly used for heating feeding, etc., which has greatly improved the local economy, Contribute to the realization of the "dual carbon" goal in the region.
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表 1 井温数据
Table 1. Well temperature data
表 2 地热流体水化学分析结果
Table 2. Water chemical analysis results of hydrothermal fluids
表 3 Caexcess-Nadeficit数据
Table 3. Caexcess-Nadeficit data
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