The contact-free, laser-flash (LFA 457) apparatus was used to measure the thermal diffusivity (\(a\)) of oil reservoir rock samples over the temperature range from (303 to 723) K at atmospheric pressure. The measurements of the heat capacity (\(C_{P}\)) of the same oil reservoir rock sample were performed over a temperature range from (305 to 771) K using DSC 204 F1 technique. The combined expanded uncertainties of the temperature (\(T\)), thermal diffusivity (\(a\)) and heat capacity (\(C_{P}\)) measurements at the 95% confidence level with a coverage factor of k = 2 are estimated to be 20 mK, 3 % and 1 %, respectively. The measured thermal diffusivity and heat capacity data and their temperature dependence for oil reservoir rock were interpreted in terms of the damped harmonic oscillator (DHO) theory and modified multi-component Einstein model, respectively. Theoretically based correlations for the thermal diffusivity (DHO model) and heat capacity (multi-peak model based on vibrational spectra) were adopted to accurately represent the measured data. The measured values of \(a\) and \(C_{P}\) together with the density (ρ) data were used to calculate the derived values of thermal conductivity (\(\lambda = \rho C_{P} a\)) of the oil reservoir rock. The effect of phase changes (dehydration and thermal decomposition) in the intra pore fluids (oil and water) on thermal properties (thermal diffusivity, heat capacity, and thermal conductivity) of oil reservoir rock samples have been studied. We observed rapid increase of the heat capacity of the oil reservoir rock sample in distinct temperature ranges, around 323 K and 745 K. We attribute these irregularities in temperature dependence of thermal diffusivity and heat capacity to the dehydration (intensive vaporization of pore water) and the thermal decomposition of the residual heavy oil component (pyrolysis), which occurs at high temperatures. Based on the present measured thermophysical property data we have developed a model that simulated the heat transfer process in an oil reservoir where the thermal diffusivity of the reservoir media is considered as a function of temperature. The temperature variation at each point of the reservoir is calculated using a heat transfer equation with temperature dependent thermal properties of the reservoir media, i.e., the reservoir temperature profile, \(T\left( {x,t} \right)\), was simulated with thermophysical property changes of the reservoir media. We observed heat transfer alteration of the oil reservoir media due to temperature dependence of the thermal diffusivity. It was shown that taking into account the temperature dependence of the thermal diffusivity, considerably affects the heat transfer alteration of oil reservoirs.

使用非接触式激光闪光 (LFA 457) 装置在大气压下在 (303 至 723) K 的温度范围内测量油藏岩石样品的热扩散率 ( \(a\) )。使用 DSC 204 F1 技术在 (305 至 771) K 的温度范围内对同一油藏岩石样品的热容量 ( \(C_{P}\) ) 进行了测量。温度 ( \(T\) )、热扩散率 ( \(a\) ) 和热容量 ( \(C_{P}\) ) 测量的组合扩展不确定度在 95% 置信水平下，覆盖因子为k = 2 估计分别为 20 mK、3 % 和 1 %。分别根据阻尼谐振子 (DHO) 理论和修正的多分量爱因斯坦模型解释了测得的热扩散率和热容量数据及其对油藏岩石的温度依赖性。采用基于理论的热扩散率（DHO 模型）和热容量（基于振动光谱的多峰模型）的相关性来准确表示测量数据。\(a\)和\(C_{P}\)的测量值与密度 ( ρ ) 数据一起用于计算热导率的导出值 ( \(\lambda = \rho C_{P} a\ )) 的油藏岩石。已经研究了孔隙内流体（油和水）中的相变（脱水和热分解）对油藏岩石样品的热特性（热扩散率、热容和热导率）的影响。我们观察到油藏岩石样品在不同温度范围内的热容量迅速增加，大约 323 K 和 745 K。我们将这些热扩散率和热容量的温度依赖性不规则归因于脱水（孔隙水的强烈蒸发）和在高温下发生的残余重油组分的热分解（热解）。基于目前测得的热物理特性数据，我们开发了一个模型，用于模拟油藏中的传热过程，其中油藏介质的热扩散率被视为温度的函数。储层每个点的温度变化是使用传热方程计算的，该方程具有储层介质的温度相关热特性，即，储层温度剖面\(T\left( {x,t} \right)\)是通过储层介质的热物理特性变化来模拟的。由于热扩散率的温度依赖性，我们观察到油藏介质的传热变化。结果表明，考虑到热扩散率的温度依赖性，显着影响油藏的传热变化。