云南龙陵地热资源特征及成因分析

CHARACTERISTICS AND GENESIS ANALYSIS OF GEOTHERMAL RESOURCES IN LONGLING,YUNNAN

地处中国著名滇藏地热带的龙陵县,地热资源丰富,但其形成机制和利用前景尚不明确。本文通过对龙陵县温泉及泉群的地质调查,分析其形成的地质条件、控热因素及温泉分布特征,将龙陵地热资源划分为2个水热活动带3个相对独立的地热区,建立了龙陵温泉成因概念模型。结果表明:(1)研究区温泉分布不均,沿断裂呈带状展布,沿水系呈片状出露。(2)天然温泉的温度范围29℃~102℃,矿化度范围105~927 mg/l,水化学类型以HCO3-Na为主,泉质类型有碳酸泉、硫磺泉、硅酸泉、氡氟泉等。(3)研究区地热泉的发育与断裂构造关系密切,其成因类型为断裂深循环型。该地区地下热水开发利用潜力较高,建议继续深入开展地质学、水文地质学、地球物理和地热成因机理等多学科综合研究,从而更好地定量评价地热潜能与开发前景。

Longling County,located in the tropical zone of Yunnan Tibet,is rich in geothermal resources,but its formation mechanism and utilization prospect are not clear.Based on the geological investigation of 40 hot springs and spring groups in Longling County,this paper analyzes the geological conditions,thermal control factors and distribution characteristics of hot springs,divides the geothermal resources of Longling into 2 hydrothermal active zones and 3 relatively independent geothermal zones,and establishes the conceptual model of the genesis of the hot springs.The results show that:(1)the hot springs in the study area are distributed unevenly,along the fault zone and along the water system.(2)The temperature range of the natural hot spring is 29℃~102℃,the mineralization range is 105~927 mg/l,the hydrochemical type is mainly HCO3-Na,and the spring types are carbonated spring,sulfur spring,silicic acid spring,radon fluorine spring,etc.(3)The development of geothermal spring in the study area is closely related to the fault structure,and its genetic type is fault deep cycle type.The development and utilization potential of geothermal water in this area is relatively high.It is suggested to continue to carry out comprehensive research on geology,hydrogeology,geophysics and geothermal genesis mechanism,so as to better quantitatively evaluate the geothermal potential and development prospect.