磁西煤系下岩溶热水水文地球化学特征及成因

Hydrogeochemical characteristic and genesis of hot karst groundwater under coal-bearing strata in the western Cizhou

根据水质分析结果,并结合岩溶地下水水质资料,分析了磁西煤田一号采区的深层岩溶热水水文地球化学特征、热储特征及其成因。结果表明,磁西煤田煤系下具有高TDS、高硬度、SO4Cl-CaNa型水质特征的深层岩溶温热水是地下水沿断裂构造参与深部循环、长期演化的结果;地热异常属于热水型地热,热储温度可达60°C以上,循环深度在1500m以上,热源来自于燕山期岩浆侵入岩体产生的热异常与区域地温的叠加。本研究同时也为地热资源研究、煤田开发、矿井热害和矿井水防治提供有意义的参考。

Based on the analysis of the water sample and integration of karst groundwater data, this paper analyzes the hydrogeochemieal and geothermal characteristics of the hot karst water and its genesis in the western Cizhou coalfield. The results show that the deep karst warm- hot water in Ordovieian under the coal - bearing strata is SO4 Cl - CaNa type water with high TDS and high hardness, and its formation is derived from the deep seepage of groundwater along faults and long time evolution; the geothermal abnormity is water - heated geothermy with more than 60℃ temperature of heat storage and 1500m depth of circulation, and the heat source is from the thermal addition of igneous rock mass intruding in Yanshanian over the regional normal geothermy. The research provides some reference in geothermal research, coal exploitation, prevention of thermal damage and mine water damage.