非均一多孔介质中的水热迁移研究

孔隙裂隙非均一多孔介质中水热迁移的研究，国际上只是近年来才开始取得明显的进展。在发育裂隙的孔隙岩层中同时存在着两种渗流系统：孔隙总体积较大、渗透性相对弱的多孔岩块和总体积较小、渗透性却相对较强的分割多孔块体的裂隙。从而提出了“孔隙一裂隙二重性”假定，即地下水主要贮存在孔隙中，而水的运动主要在裂隙中进行，用一个一阶量描述孔隙裂隙间水流（热流）的传递耦合项。本文导出描述孔隙─裂隙岩层中的水流和热迁移的基本微分方程，建立起相应的数学模型，并成功地用于我国西藏羊八井热田分布参数模型的水热迁移研究。

STUDY ON THE HEAT AND FLUID FLOW IN HETEROGENEOUS POROUS MEDIA

More and more studies on heat and fluid flow in heterogeneous porous media are recently carried out for the nuclear waste repository disposal. There are two kinds of permeable systems exist simultaneously in fractured rocks: less permeable matrix pore system and higher permeable fracture network system. Flow and heat transport in fractured rocks are frequently described using double-porosity models. Such an approach assumes that both water flow and heat transport can be described by equations coupled with a term characterizing the exchange of fluid or heat between the two different pore systems. The authors successfully applied this thought in the distributed model analysis for the Yangbajian geothermal field,Tibet, China.