四川绵竹酿春池温泉地质成因分析

Geological genesis analysis of the Niangchunchi hot spring in Mianzhu,Sichuan,China

利用遥感地质、构造地质、热水化学和稳定同位素和放射性同位素等手段,对四川绵竹酿春池温泉的水源、热源以及补给、径流和储集与构造的关系进行了分析.认为其水源为大气降水,热源为深循环加热,热储温度96℃,环流深度3 000～4 000 m.在山前地区,近源低温地下水与深部的热水混合.酿春池温泉的地质成因模式为:在正常区域地热场环境中,大气降水沿高渗透率的岩石渗入地下.深部地下水沿断层破碎带向山前运移,循环加热.深部地下水在山前区两条断层交会处上涌汇集,并与近源低温地下水混合.热水在盖层被人工凿穿时涌出.

This peper analyses the water source, heat source and the relationship between the groundwater circulating system and the geological structures using the research for remote sensing geology, structural geology, hydrothermal-chemical processes, stable isotopes and radioactive isotopes, and so on. The water source is regarded as atmospheric precipitation, and the heat source is regarded as that the groundwater is heated by itself deep circulation. The reservoir temperature is 96℃, and the groundwater circulating depth is 3 000-4 000 m. The proximal and low temperature groundwater and the deep and hot groundwater mix in the mountain front area. The geological genetic model of the Niangchunchi hot spring is that under the normal regional geotemperature pattern conditions, the atmospheric precipitation in the Longmen Mountain area seeps into underground along the rocks with high infiltration ratio. And the deep groundwater moves to the mountain front along the crack belt of the major fault and is heated in the course of deep circulation. In the mountain front, the thermal water upwells and gather at the place where two faults intersect, and mixes with the proximal and low temperature groundwater here. The hot water gushes when the cover strata of the geothermal reservoir are drilled through by the manual method.