共和盆地恰卜恰地区新近系地下热水化学特征
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中国地质调查局水文地质环境地质调查中心

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P592;P632+.3

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The chemical characteristics of Neogene geothermal water in the Chabqa area of the Gonghe Basin
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Center for Hydrogeology and Environmental Geology Survey, China Geological Survey

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    摘要:

    位于青藏高原东北缘的共和盆地地热资源丰富、种类齐全,既有中低温水热型又有高温干热型地热资源。但两者间的相关性研究目前还相对较弱。本文以共和盆地恰卜恰地区新近系地热系统为研究对象,通过选取对水样的分析估算深层地下热水水化学特征及热储温度、循环深度,从而推测研究区新近系地热系统的成因模式,探索干热型和水热型地热系统相互影响关系。分析结果表明:(1)该区地下水优势阳离子为Na+,占比多超过90%,水化学类型主要为Na-Cl·HCO3型、Na-HCO3·Cl或Na-Cl·HCO3·SO4,经过较长的径流路径和较慢的水循环过程,水岩作用程度较高,属地下水径流的末端或排泄区;(2)通过化学温标估算研究区新近系热储温度为71~134℃,地下热水的循环深度为1300~2200m,深于研究区花岗岩结晶基底顶面埋深;(3)研究区新近系地热系统主要热源为深部壳内部分熔融层,新近系含水层地下水受深部高温花岗质岩体热传导导热加热升温,第四系地层为盖层,保证新近系地层温度降温缓慢,形成中低温地热系统。本研究加深了干热岩地热系统对浅部水热型地热系统影响的认识。

    Abstract:

    The GongHe Basin, located in the northeastern Qinghai-Tibet Plateau, is rich in geothermal resources and has various types of geothermal resources, including both medium-low temperature hydrothermal geothermaland high temperature hot dry rock. However, the research on the correlation between the two is still relatively inadequate. In order to infer the genetic model of the Neogene geothermal system in the study area and explore the interrelationship between hot dry rock geothermal and hydrothermal geothermal systems, the Neogene geothermal system in the Qiabuqia area of the GongHe Basin was taken as the research object, the chemical characteristics, reservoir temperature and circulation depth of deep-seated aquifers were estimated by analyzing the selected water samples. The results showed. (1) The dominant cation of groundwater in this area is Na+, which accounts for more than 90%. The main water chemistry type is Na-Cl·HCO3 type, Na-HCO3·Cl or Na-Cl·HCO3·SO4. After a long runoff path and slow water cycle process, the degree of water rock interaction is high.The groundwrater in the study area is the end of groundwater runoff or discharge area. (2) The Neogene rreservoir temperature in the study area is 71~134℃ estimated by geochemical standard, and the circulation depth is 1300~2200m, which is deeper than the buried depth of the top of the granite crystalline basement. (3) The main heat source of the Neogene geothermal system in the study area is the partial molten layer in the deep crust. The groundwater of the Neogene aquifer is heated by the heat conduction of the deep high-temperature granitic rock mass. The Quaternary stratum is the cap layer to ensure that the temperature of the Neogene stratum decreases slowly, forming a low-temperature geothermal system. This study has deepened the understanding of the influence of hot dry rock geothermal system on shallow hydrothermal geothermal system.

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牛兆轩,牛雪,张林友,等. 共和盆地恰卜恰地区新近系地下热水化学特征[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-09-16
  • 最后修改日期:2022-04-18
  • 录用日期:2022-04-24
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