云南水富地热钻孔水的地质地球化学特征

本文讨论了金沙江河谷区云南水富地段内地热带的区域地质背景和主要地质构造格局,并通过对区内地热钻孔水及邻近的地表泉点、地表水的同位素与水化学分析研究,地热水的形成和成藏的地质地球化学过程探讨,指出地热区位于多方向构造的复合部位,发育的断裂构造利于富集和提供良好的热源和深部地下水循环通道,属中低温对流型地热系统;源于大气降水,补给区系区内最高,运移途径长,循环深度大,在含水层内的滞留时间最长,与热储层的能量交换充分.地热水具有水温稳定、水量大及承压的特点,有较大的开发潜力.

Geological and Geochemical Characteristics of the Water from Geothermy Drill Holes in Shuifu, Yunnan

Geological background of the Jinshajiang River valley in Fushui, Yunnan had been described in this paper. Geological and geochemical processes forming the thermal spring water had been studied by mean of chemical and isotopic data of the water from the geothermy drill holes and the neighbor thermal spring spots. It is indicated that this region is located at a junction of several faults. These faults provided conduits for the thermal water convection to form a low-medium temperature underground thermal water system at depth. The water precipitated downwards from higher places in this area, passed through a long distance and a big depth. Extensive thermal exchange with hot wall-rocks occurred when the water was resorted in depth for a long time. The underground thermal water is characteristic by constant temperature, large amount, and high bearing-pressure, and thus has a big economic potential.