温度变化对碳酸盐岩储层岩石热物性的影响  

Influence of temperature change on thermalphysical properties of carbonate reservoir rocks

作　　者：赵秀峰[1] Zhao Xiufeng(Geological Survey of Jiangsu Province,Nanjing 210018,Jiangsu,China)

机构地区：[1]江苏省地质调查研究院,江苏南京210018

出　　处：《地质学刊》2023年第1期100-105,共6页Journal of Geology

基　　金：江苏省自然资源科技计划项目“苏热1井干热岩储层岩石热物理特性研究”(2021030);江苏省地质勘查基金项目“江苏省干热岩资源预查”(2019—2020);中国地质调查局地质调查项目“土壤界限含水率等标准物质研制及DT-92《土工试验规程》修订”(DD 20160095-15)。

摘　　要：以苏北盆地某地热井碳酸盐岩储层岩石为研究对象,对处于20、50、100、150、200℃5个实时温度点的3组岩石样品进行热物性参数测试,分析导热系数、比热容和热扩散系数随温度变化的规律,拟合趋势曲线和经验公式,探讨影响机制。结果表明:在20~200℃的温度区间内,随温度的升高,岩石的导热系数拟合曲线以二次多项式关系呈下降趋势,50℃的温度点是岩石导热系数由急速下降到缓速下降的拐点,导热系数平均值减小约31.47%;比热容拟合曲线以二次多项式关系呈上升趋势,比热容平均值增大约23.27%;热扩散系数随温度的变化趋势与导热系数一致,且二者具线性相关,100℃温度点是热扩散系数由急速下降到缓速下降的拐点,热扩散系数平均值减小约44.48%。随着温度的升高,比热容增大造成的补偿作用是导热系数下降幅度小于热扩散系数的主要原因。Taking the carbonate reservoir rocks of a geothermal well in the North Jiangsu Basin as the research object,the thermalphysical property parameters of 3 groups of rock samples at 5 real-time temperature points of 20,50,100,150 and 200℃ were tested.The law of thermal conductivity coefficient,specific heat capacity and thermal diffusion coefficient changing with temperature was analyzed.The trend curve and empirical formula were fitted to explore the influence mechanism.The results show that,firstly,the fitting curve of thermal conductivity coefficient of rock decreased with the increase of temperature in the range of 20-200℃ in a quadratic polynomial relationship.50℃ was the reflection point where thermal conductivity coefficient of rock turns from rapid decline to slow decline,and its average value decreased by about 31.47%.Secondly,the fitting curve of specific heat capacity showed an upward trend with quadratic polynomial relation,and its average value increased by 23.27%.Thirdly,the variation trend of thermal diffusion coefficient with temperature was consistent with that of thermal conductivity coefficient,and there was a linear correlation between the two.100℃ was the inflection point where the thermal diffusion coefficient turned from rapid decline to slow decline,and its average value decreased by about 44.48%.With the increase of temperature,the compensation effect caused by the increase of specific heat capacity is the main reason that the decrease of thermal conductivity coefficient was less than that of thermal diffusion coefficient.

关 键 词：干热岩 碳酸盐岩储层 热物性 温度 瞬态平面热源法 苏北盆地 

分 类 号：P584[天文地球—岩石学]