山东德州凹陷地下热水地球化学特征及成因

典型地区地下水成因和演化机制的研究不仅对于热水资源的合理利用与开发具有重要的指导意义,而且可以为日后的地热资源勘查评价提供重要信息。笔者通过对德州凹陷的地下热水的化学成分、同位素及其水文地质特征的分析,进而对这一地区的地下热水的成岩和演化过程进行了研究。结果显示地下热水的形成受区内深大断裂和基底构造对地热形成的控制,地下热水补给是来自大气降水,为入渗变质水,水化学成分以易溶盐溶解作用为主,其气体组分主要起源于大气、地壳和地幔的混合物,反映了地下水长期径流及深循环中各种水化学作用。

Geochemical characteristics and origin of geothermal water in the Dezhou hollow

Studies of the origin and evolution mechanism of groundwater in a type area not only have great significance for guiding the rational utilization and development of geothermal water resources but also provide important information for future geothermal resource exploration and evaluation.The authors studied the formation and evolution of geothermal water in the Dezhou hollow based on an analysis of the chemical composition,isotopes and hydrogeological characteristics of geothermal water in the area.The study shows that: the formation of the geothermal water is controlled by deep faults and basement structure in the area;the geothermal water is recharged by meteoric water,belonging to penetrating metamorphic water;the hydrochemical components consist predominantly of more soluble salts;and gas components are mainly marked by a mixture of components originating from the atmosphere,crust and mantle ultimate source is meteoric water-all these reflect the various hydrochemical processes in long-term run-off and deep circulation of groundwater.