关中盆地西安凹陷地热水赋存特征及其资源量估算

地热资源的开发利用有助于调整能源结构、提高环境质量和治污减霾.关中盆地西安凹陷地热水赋存条件较好,资源量丰富,地热水具备规模化开发利用的基础.目前,未见关于西安凹陷地热储层划分及资源量的研究.将西安凹陷地热水热储层分为红河-白鹿塬组、新近系的冷水沟-寇家村组、蓝田灞河组、张家坡组4类,对其系统分析每类热储层的储盖特征、...

On the Occurrence Characteristics and the Estimation of Geothermal Water in Xi'an Sag,Guanzhong Basin

The development and utilization of geothermal resources is of help to adjust the energy structure,to improve environmental quality and to reduce pollution.The geothermal water in Xi'an sag of Guanzhong Basin has good occurrence conditions and abundant resources for large-scale development and utilization.Few research has been conducted yet on the division and the amount of the geothermal resources in Xi'an sag.In this paper,the geothermal reservoirs in Xi'an sag are divided into four types:Honghe Bailuyuan Formation,lengshuigou koujiacun Formation,Lantian Bahe Formation and Zhangjiapo Formation.The authors systematically analyzes the reservoir cap characteristics,formation lithology and sedimentary equality of each type.Through the chemical analysis of geothermal water,it is considered that in the vertical direction,the geothermal water storage environment is more closed in the deeper part while in plane,the environment is relatively closed in the middle part.In the south and the north,the chemical environment is relatively open.Combined with the regional geo-temperature data,the paper calculates the depth of the constant temperature layer of the proluvial plain and the alluvial plain,and analyzes the characteristics of the geotemperature field and the regional geotemperature gradient at the depth of 20m,500m,1500m and 2000m.Using the volume method,this paper evaluates the total volume reserves,total elastic reserves and total static reserves of geothermal water in Xi'an sag.The total volume reserves are 5270.96×10^8 m^3,total elastic reserves are 16.89×10^8 m^3 and total static reserves are 5287.85×10^8 m^3.On the basis of the studies of geothermal water resources in Xi'an sag,the authors hold that the area is rich in geothermal water resources.The stability of the thermal reservoirs makes it relatively safe for development and utilization.Development and utilization of geothermal water in the area is of significance to control pollution and reduce haze,to adjust energy consumption structure,and to improve people s livelihood as well.