陕西杨凌示范区五泉镇地热资源潜力分析

Potential analysis of geothermal resources in Wuquan Town of Yangling demonstration area,Shaanxi Province

为综合分析陕西杨凌示范区五泉镇区域地热开发潜力,通过对区内热储层特征进行分析,明确了具有经济开发价值的层位主要为新近系砂岩热储层,基底为奥陶系碳酸盐岩。区内平均地温梯度随深度增大,每100 m在2. 57～3. 00℃之间,水化学类型为Cl-Na型。根据现有数据计算分析,杨凌示范区五泉镇26. 6 km^2范围内砂岩热储层流体总静储量为24亿m^3,可采流体量为0. 36亿m^3,可采流体所含热量为173 TJ,折合标煤590万t,显示该区域中低温资源潜力巨大。

In order to comprehensively analyze the geothermal potential of Wuquan Town of Yangling demonstration area,Shaanxi Province,this work analyzed the characteristics of regional thermal reservoir and determined the Neogene sandstone thermal reservoir with basement of Ordovician carbonate rocks as horizons with economic value. With the increasing depth,the average well temperature gradient in the region ranges from 2. 57 to 3. 00 ℃/100 m,and the hydrochemistry type is Cl-Na. According to the existing data,the total static fluid reserves of the sandstone thermal reservoir in the 26. 6 km2 range of Wuquan Town in Yangling demonstration area are24 × 10^8 m^3;the recoverable fluid amount is 0. 36 × 10^8 m^3;the caloric content of the recoverable fluid is 173 × 10^12 J,which is equivalent to 5. 9 × 10^6 t of standard coal,indicating a huge potential of the low-middle temperature sources in this region.