天津地区地层热物性特征及影响因素分析  

An analysis of the characteristics of thermal physical properties and their influencing factors in the Tianjin area

作　　者：阮传侠[1,2] 冯树友 牟双喜 程万庆[2] 赵苏民[2] 

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100083 [2]天津地热勘查开发设计院,天津300250

出　　处：《水文地质工程地质》2017年第5期158-163,共6页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金项目(41502256)

摘　　要：为分析天津地区地层热物性参数的地区分布特征和平面分布规律,布置88个勘查孔、现场采集1 076个岩土样、室内分析热导率、比热容、热扩散系数等地层热物性实验,对测试数据进行统计分析。结果表明:天津市岩土体热导率在1.26~1.70 W/(m·K),比热容在2 050~2 090 J/(kg·K),热扩散系数在0.45×10^(-6)~0.74×10^(-6)m^2/s。同一地区不同岩性的比热容,黏土最大、粉砂最小,热导率刚好相反,热扩散系数与比热容规律相同;不同地区同一岩性的热物性参数差别不大。天津市比热容与热导率呈现大致相反的趋势,热导率高值区位于蓟县、宝坻和宁河的东部、武清西部、静海南部以及滨海新区的中部地区;比热容高值区位于蓟县、宝坻和宁河西部、武清东部、静海北部以及滨海新区大部分地区。In order to analyze the regional distribution and plane distribution regulations of thermal physical parameters of the strata in the Tianjin area,the authors use 88 exploration holes,collect 1 076 soil samples,analyze thermal conductivity,specific heat and thermal diffusion coefficient of formation in the laboratory and carries out statistical analyses of the test data. The results show that the heat conductivity of rock and soil body in the Tianjin area is 1. 26 - 1. 70 W/（ m·K）,the specific heat capacity ranges from 2 050 to 2 090 J/（ kg·K）,and the thermal diffusion coefficient varies from 0. 45 × 10-（-6） to 0. 74 × 10-（-6）m-2/s. The specific heat of different rocks in the same region is different： clay is the smallest and silt is the biggest. The situation is contrary for the thermal conductivity. The thermal diffusivity and the specific heat capacity are of the same changes. Difference in thermal physical parameters in different parts of the same rocks is not large. In the Tianjin region the heat capacity and the thermal conductivity are roughly in an opposite trend,i. e.,the areas of high value of thermal conductivity is located in the easttern parts of Jixian,Baodi and Ninghe county,the western part of Wuqing,the southern part of Jinghai and the middle part of the Binhai new area; the areas of high value of the specific heat capacity lie mainly in the western part of Jixian,Baodi and Ninghe county,the eastern part of Wuqing,the northern part of Jinghai and the most part of the Binnhai new area.

关 键 词：地热地质 热导率 比热容 热扩散系数 水文地质 地层热物性 天津地区 

分 类 号：P314.1[天文地球—固体地球物理学]