南京市浅层地温场监测方案和地温分布特点研究  

Study on Plans of Monitoring Shallow Geothermal Field and Characteristics of Geothermal Energy Distribution in Nanjing

作　　者：张天生 刘春[1,2] 李济琛 施斌 ZHANG Tiansheng;LIU Chun;LI Jichen;SHI Bin(School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China;High-Tech Research Institute of Nanjing University(Suzhou),Suzhou 215123,China)

机构地区：[1]南京大学地球科学与工程学院,南京210023 [2]南京大学(苏州)高新技术研究院,苏州215123

出　　处：《高校地质学报》2020年第6期656-664,共9页Geological Journal of China Universities

基　　金：国家自然科学基金项目(41761134089,41977218);江苏省自然科学基金青年项目(BK20170393)联合资助。

摘　　要：浅层地温能作为可再生能源,已经引起广泛关注。为了有效地监测南京市浅层地温场的时空演化,针对4种温度传感器:DTS、FBG、Pt100和iButton,通过野外和室内试验进行分析对比,从测温精度、适用范围、工作特性等方面展开研究。结合试验结果和目前的实际应用情况,总结出四种传感器在浅层地温场监测方面的优缺点和特性,并制定出一套较为完善的监测方案,为浅层地温场的长期时空监测提供参考:在所有钻孔中埋设分布式测温光纤,并根据地温钻孔的土层分布和所获取的地温分布数据,选取两个较为典型的地温钻孔布设FBG测温串;在所有钻孔点距地表5 cm处布设iButton,并使用Pt100监测地表以下25 m内的精确地温。根据已获得的监测数据,可总结出南京地区浅层地温在垂向上的大体分布规律,发现其分布在空间上具有差异性,浅地表地温与地表覆盖层、大气及太阳辐射有关,深部地温受地质构造和水文地质条件等因素控制。As a type of generable energy,shallow geothermal energy has been widely noticed.It’s very important to establish a long-term effective shallow geothermal field monitoring system in the process of developing and utilizing shallow geothermal energy.In order to better monitor shallow geothermal field and the temporal and spatial distribution of energy,four kinds of temperature sensors used in the project,DTS,FBG,Pt100 and iButton,were analyzed and compared from measurement accuracy,applicable range and characteristics through field and indoor tests.Combined with the results of tests and current application,the advantages and disadvantages of DTS,FBG,Pt100 and iButton on shallow geothermal field monitoring are summarized and a more completed monitoring plan is developed,which provides a reference for monitoring shallow geothermal field and its temporal and spatial distribution of energy.The follows are shown.Distributed temperature sensing fiber is buried in all boreholes,and two typical ones will be selected according to the soil layer distribution of the geothermal borehole and the obtained geothermal distribution data.Along the borehole,FBG temperature sensing string is arranged in the borehole.iButton is arranged at 5cm from the surface of all drilling points;Use Pt100 to monitor the precise temperature along the borehole within 25 m below.According to the obtained data,the general distribution of the shallow geothermal energy in the vertical direction in Nanjing can be summarized,and the distribution is found to be spatially different.The shallow geothermal energy near surface is related to the surface cover,the atmosphere and solar radiation,while the deeper energy is affected by factors such as geological structures and hydrogeological conditions.

关 键 词：浅层地温场 DTS FBG PT100 IBUTTON 

分 类 号：P468.021[天文地球—大气科学及气象学]