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山西忻州盆地地热水地球化学特征及其成因机制
张梦昭, 郭清海, 刘明亮, 刘强
PDF(3650 KB)
PDF(3650 KB)
山西忻州盆地地热水地球化学特征及其成因机制
Geochemical Characteristics and Formation Mechanisms of the Geothermal Waters in the Xinzhou Basin, Shanxi Province
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地热水地球化学研究对于认识各类水热型地热资源的成因机制有重要意义.以山西忻州盆地为研究区，开展了系统的地球化学研究.结果显示，忻州盆地地热系统的形成与地壳浅部岩浆房和浅部岩石放射性元素衰变热异常无关，而是正常热流背景下地下水深循环的结果.地热水的水化学和氢氧同位素特征均指示区内地热水补给来源于西部云中山区大气降水，大气降水由补给区入渗并向东部忻州盆地运移，循环深度为1 618.3~3 451.5 m，热储温度达48.4~91.8 ℃.地热水上升至第四系孔隙热储后普遍混入浅层地下冷水，最高混合比可达78%.
Studies on geothermal water geochemistry are of great significance for understanding the genesis of various hydrothermal resources. By taking the Xinzhou basin in Shanxi Province as a study area, this paper aims to identify the geochemical origin of the Xinzhou geothermal waters, to evaluate the mixing process between the geothermal waters and the shallow cold groundwaters, and to reveal the geological genesis of the Xinzhou geothermal system based on a systematic geochemical study conducted there. The formation of the Xinzhou geothermal system should have nothing to do with a shallow magma chamber or excessive decay heat of radioactive elements in shallow rocks. Instead, it occurred as a result of the deep groundwater circulation in a normal heat flow background. The atmospheric precipitation in the western Yunzhongshan recharge area infiltrated into the deep underground and migrated to the Xinzhou basin with circulation depths between 1 618.3 and 3 451.5 m. Correspondingly, the reservoir temperatures ranged from 48.4 to 91.8 °C. The geothermal waters were mixed substantially with the shallow groundwaters when ascending to the Quaternary aquifers, the highest mixing ratio being up to 78 %.
geothermal water / geochemistry / reservoir temperature / heat source / Xinzhou basin
P641
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