云南石林盆地地热田地热资源特征

石林是国家地质公园,位于滇东断陷盆地,其地热研究是对云南断陷盆地地热研究的理论论证.论文通过对石林地热的热源、热田结构、水文地质特征、水化学特征进行研究,地热类型为深循环层状地热田,受九乡-石垭口断裂和牛头山古陆控制,形成封闭的层状低温地热田.从水文地质条件看,地下热水水化学类型为HCO3-Ca,偏硅酸含量较高.地热热储层埋藏深,水温45 ～51℃,地下热水具承压性,宜于开采利用.但热田水补给资源有限,且上部冷水丰富,应控制地热水的开发利用.该研究成果对滇东其他岩溶断陷盆地地热开发有应用和参考价值.

Geothermal resources characteristics of Shilin basin geothermal field in Yunnan province

Shilin is a national geological park which is located in eastern Yunnan basin. The study on its geothermal is the theoretical demonstration of Yunnan rift basin geothermal. This paper studied the geothermal type, geothermal field structure, hydrogeological characteristics and water chemistry characteristics. The geothermal type belongs to deep cycle layered geothermal field and controlled by Jiyxiang-Shiyakou fault and Niutoushan ancient land so as to form the low temperature geothermal field of close layered. According to the hydrogeological conditions, the chemical type of geothermal water is HCO₃-Ca with high silicic acid content. As the geothermal reservoir is deeply buried, its water temperature is from 45to 51centigrade and with pressure-bearing, the underground hot water is suitable to exploit. While the resources supply is limited and the upper cold water is rich, the development and utilization of geothermal water should be controled. The result has application and reference value for the development of other eastern Yunnan karst rift basins.