Analysis of the Formation Mechanism of Medium and Low-Temperature Geothermal Water in Wuhan Based on Hydrochemical Characteristics

Wuhan and its surrounding areas have obvious geothermal spring outcrops, which are unexplored potential resources. The degree of resource development in is low, there a lack systematic research on their hydrochemical characteristics formation mechanism. area bounded by the Xiang-Guang fault, South Qinling-Dabie orogenic belt north, Yangtze landmass south, with Silurian Quaternary outcrops little bedrock outcrops. main water barrier region, separates upper Triassic Paleogene as shallow aquifers lower Cambrian Ordovician deep aquifers. Different strata connected series fault structures, constitute Wuhan’s unique groundwater water-bearing system. Eleven (23~52 °C) six surface samples (around 22 were collected from study area. weakly alkaline, pH 7.04~8.24. chemical type mainly SO42− higher TDS HCO3− TDS. Isotopic analysis indicates that atmospheric precipitation water-rock interaction ionic sources water. composition dominated ion-exchange interactions dissolution carbonates silicates. characteristic coefficients, correlation analysis, chemistry type, recharge elevation, age, reservoir temperature, cycle depth also analyzed. performance was similar same reservoir, could be judged an obviously fluid genetic conceptual model preliminarily deduced. DXR-8 DXR-9 had best conditions, hydrodynamic rapid alternation bodies, large circulation depth, favorable location for will bring considerable economic social benefits.