浅层地温能岩土热物理性质及地温场特征——以山东省莒县为例

Study on Thermal Physical Properties and Characteristics of Geothermal Field of Shallow Geothermal Energy in Jvxian County in Shandong Province——Taking Jvxian County in Shandong Province as an Example

本文以山东莒县为例,采用野外调查、岩土样品热物理测试、水样测试、现场热响应试验、地温监测的方法,利用现场数据及实验室测试数据,总结了莒县浅层地温能不同岩土体热物理参数特征,岩土体的热扩散率、比热容与其密度呈负相关性,导热系数与其密度呈正相关性。浅层地热水与岩石之间的化学作用没有达到平衡状态,水-岩反应微弱。浅层地温空间分布特征为北部第四系厚度较大,地温较高,西南部以红土崖组和田家楼组为主则地温较低。对莒县浅层地温能换热方式适宜性评价及概算浅层地温能资源量提供了依据,对于地源热泵系统的设计和运行具有重要的参考价值。

Taking Jvxian county in Shandong province as an example,thermal physical parameters of different rock and soil masses in shallow geothermal energy in Jvxian county have been summarized based on field investigations,thermal physical testing of rock and soil samples,water sample testing,on-site thermal response testing and geothermal monitoring.The thermal diffusivity and specific heat capacity of rock and soil mass are negatively correlated with their density,while the coefficient of thermal conductivity of rock and soil mass is positively correlated with their density.The chemical interaction between shallow geothermal water and rocks has not reached equilibrium,and the water-rock reaction is weak.The spatial distribution characteristics of shallow geothermal fields indicate that the northern Quaternary system is thicker and has a higher ground temperature,while the southwest is dominated by Hongtuya group and Tianjialou group,which exhibit lower ground temperatures.This study lays the groundwork for the adaptive evaluation of shallow geothermal energy heat exchange methods in Jvxian county and for estimating shallow geothermal energy resources.It will provide a significant reference value for the design and operation of ground source heat pump systems.