蓬莱黄泥沟地区地热水化学特征分析OA

Based on water samples collected from the completed Huangnigou geothermal well and the surrounding shallow cold and hot water sources,this article conducts a water chemical characteristic analysis using methods such as Piper trilinear diagram,ion ratio analysis,Langelier-Ludwig diagram,silica-enthalpy model analysis,corrosivity evaluation,and water-rock interaction simulation.Cation and silica geothermometers were applied to estimate the geothermal reservoir temperature.The results indicate that the Huangnigou geothermal water has a temperature of 56℃ and is classified as the HCO3·SO4-Na type with weakly alkaline.It shows relatively high concentrations of fluoride and metasilicic acid,reaching or approaching levels of medicinal value,and can thus be classified as fluoride-rich fresh water.The water is non-corrosive and non-scaling,suitable for use in health care and rehabilitation services.Analysis suggests possible mixing with cold groundwater at an estimated cold-water mixing ratio of 22.5％.The Huangnigou geothermal water belongs to partially equilibrated water,with undersaturated quartz and chalcedony and calculated geothermal reservoir temperature ranges from 61.8 to 74.0℃.This study of the hydrochemical characteristics of the Huangnigou geothermal water provides an important basis for future exploration of geothermal resources in this area,and offers data support for well-site selection and utilization planning.