西安市地下热水赋存特征与可持续开发利用

Characteristics and Sustainable Use of Ground Geothermal Water in Xi an City

西安断陷盆地地热资源属于中低温盆地型地热资源,其分布主要受断陷区内的盆缘大断裂带及其次级伸展断裂的控制。地热盖层主要为第三系泥岩、砂质泥岩;热储层为第三系中、粗粒砂岩和中、细粒砂岩层。热储层的赋水性和温度与区内活断层构造带的活动性强度呈现出明显的相关特征。近年来由于开采的不合理性,开采过程中出现了一系列环境负效应问题,这些问题制约了地热水可持续开发利用与生态环境保护。

Based on the analysis of the exploration data, the geothermal resources of Xi＇an sunken basin is of low temperature and of the sedimentary basin type,and the occurrence of the ground geothermal water is controlled by the large-scale faults which are on the edge of the basin and their subgroup faults. The caprock of the geologic field consists of the Tertiary mudstone, and the Tertiary sandstone composed of medium and undersized granule of rock. Characteristic of high productive capacity and temperature of the geothermal water layer are related to the active intensity of tectonic cincture of the active faults. A series of negative effects of environment have arisen during the process of exploitation because of the irrational exploitation in recent years. And these negative effects have become the significant elements that restrict the sustainable use of ground geothermal water resources and the protection of entironment.