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朗久热田地下热水为中性－偏碱性低矿化水，富Ｌｉ，Ｂ，Ａｓ；Ｃｌ－ＨＣＯ３－（ＳＯ４）－Ｎａ水是主要水化学类型；Ｃａ２＋，Ｍｇ２＋是钙、镁在水溶液中的主要存在形式，其无机配合物居于次要地位；铀的主要存在形式是〔ＵＯ２（ＣＯ３）３〕４－和〔ＵＯ２（ＣＯ３）２２－〕，铀羟基配合物含量甚微；铀酰配合物计算及氢、氧稳定同位素测试结果表明，朗久地下热水主要是由大气降水起源的渗入水经深循环至还原环境形成，并有部分岩浆水混入；利用地化温标计算的地热系统浅部温度为１５０～２５０℃。
The underground hot water in Longji thermal field is of neutral-alkaline low mineralized water, rich in Li, B, As; Cl-HCO3- (SO4) -Na water is the main hydrochemical type; Ca2 +, Mg2 + UO2 (CO3) 3] 4- and [UO2 (CO3) 22-], uranium hydroxyl complex content is very small; uranium Acyl complex calculations and hydrogen and oxygen stable isotope test results show that Long Jiu underground hot water is mainly formed by the infiltration of the origin of atmospheric precipitation by deep cycle to restore the environment, and some of the magma water mixed; using geothermal thermometer calculated geothermal System shallow temperature of 150 ~ 250 ℃.