煤层气解吸扩散渗流模型研究进展

对煤储层基质孔隙分类、煤储层中气水变化特征、基质孔隙中甲烷的动力学行为、煤层气解吸模型、扩散模型、渗流模型和产气模型进行了综述和评论．认为煤层气生产过程吸附气变为解吸气．少量的解吸气溶解并在储层孔隙水中扩散．大量的解吸气聚集成泡和成柱并在煤基质孔隙中的非达西渗流、自由气从煤基质孔隙至割理．裂隙系统的窜流、自由气从煤基质孔隙至井筒的非达西渗流（仅限低煤阶）、及自由气从割理．裂隙系统至井筒的达西渗流过程．可为煤层气开发提供理论依据，为煤层气数值模拟提供理论基础，对煤层气产气规律的认识具有指导意义．

Review on desorption-diffusion-flow model of coal-bed methane

Literature reviews on matrix pores classification, gas and water phase behavior characteristics, kinetic behavior of methane in coal matrix pores, desorption model, diffusion model, percolation model, and gas production model of Coal-bed Methane （CBM） are conducted. It is concluded that the production process of CBM includes adsorbed gas desorbing, a small amount of desorbed gas dissolving into water and diffusing, a large amount of gas nuclei escaping after saturated, gas bubble and column forming, gas bubbles and columns percolating in matrix pores, free gas cross-flowing from matrix pores to cleat-fracture system, free gas flowing from matrix pores to wellbore （in case of low stage coal seam）, and free gas percolating from cleat-fracture system to wellbore. As a reference to development of CBM and a theoretical basis on numeric simulation of CBM, it is valuable to the better understanding of gas production discipline of CBM.