重庆市铜锣峡背斜地热水资源的形成与水力联系分析

Analysis on hydraulic connection and formation of geothermal water resources in Tongluo mountain anticline,Chongqing

铜锣峡背斜有富集程度较好的"地热田",该区域地层岩性以三叠系海陆交替相碳酸盐岩为主,热储构造完整,地表岩溶形态发育较好,横向沟谷切割浅,封闭好,汇水面积大,具备良好的地热水赋存基本条件。对该背斜地下热水同位素δD和δ18O的测定表明,地热水的主要来源是大气降水补给。水化学分析表明,铜锣峡背斜地下热水主要属于SO4-Ca·Mg型的低温中性偏弱碱性水,水化学性质基本稳定,且含有可溶性偏硅酸、氟以及微量的对人体有益的放射性物质。对整个铜锣峡背斜东西翼的水力联系进行分析,推断该背斜横向统景温泉区的热水系统水力联系相对较微弱,纵向上水力联系则较强。

Tongluo mountain anticline has good occurrence of geothermal water.For the development of groundwater resources in the Tongluo mountain,this paper analyzes the geological background.This area geothermal fields have a higher degree of enrichment.The formation lithology is mainly about Triassic ocean-continental inter-bedded carbonate rock.The thermal reservoir is complete and the morphology of the surface karst is well developed.The transverse gully with large catchment is shallow cut and closed.By determining the isotopes ofδD andδ18 O in the underground hot water of the mountain anticline,we find that the main source of the geothermal water is atmospheric precipitation.And the hydrochemistry verified underground hot water to SO 4-Ca type low temperature neutral alkaline water,which has stable chemistry and contains soluble partial acid,fluoride and trace amounts of radioactive materials,beneficial to human health.For more reasonable development of groundwater resources in the west wing of Tongluo mountain,this paper analyzes the hydraulic connection of the east and the west wings of Tongluo mountain anticline,the hydraulic connection is weak of the crossways of Tongjing hot-water systems,but the lengthwise hydraulic connection is strong.