含水层热量输运中自然热对流和水-岩热交换作用的研究

A STUDY ON THE NATURAL HEAT CONVECTION AND THE WATER ROCK THERMAL EXCHANGE IN THE AQUIFER THERMAL TRANSFER PROCESS

本文对含水层热量输运过程中存在的自然热对流和水－岩热交换作用进行了深入研究，目的是为了弄清两种作用对热量输运的影响。首先针对普通水流方程和热量输运方程的局限性，给出了能够描述这两种作用的新的数学方程，并通过建立一个非线性三维含水层热量输运模型加以实现。然后利用上海第二承压含水层的群井储能试验资料，根据不同的条件进行计算。计算结果与实测数据的对比分析表明，自然热对流通常对含水层的热量输运有明显作用，定量研究时不应忽略；水－岩热交换作用持续时间短，对整个热量输运过程影响较小。

The natural heat convection and the water rock thermal exchange in the aquifer thermal transfer (ATT) process are studied thoroughly in this paper in order to clarify their effect upon the process. In view of the restrictions of the conventional flow and thermal transfer equations, new equations are given to describe the two actions which are simulated accordingly by construction of a three dimensional nonlinear ATT model. Then a multi well test conducted in the second confined aquifer in Shanghai provides good data for our study. Comparison of the simulated results with the observed data shows that the natural heat convection affects the ATT process obviously and therefore can not be neglected, and that the water rock thermal exchange has insignificant effect on the ATT process because of the short duration of the process.