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对页岩气成藏机理进行了全面分析，获得了四个方面的认识。①页岩气成藏机理兼具煤层吸附气和常规圈闭气藏特征，体现出了复杂的多机理递变特点。②在页岩气的成藏过程中，天然气的赋存方式和成藏类型逐渐改变，含气丰度和富集程度逐渐增加。③完整的页岩气成藏与演化可分为3个主要的作用过程，自身构成了从吸附聚集、膨胀造隙富集到活塞式推进或置换式运移的机理序列。④相应的成藏条件和成藏机理变化对页岩气的成藏与分布产生了控制和影响作用，岩性特征变化和裂缝发育状况对页岩气藏中天然气的赋存特征和分布规律具有控制作用。研究了我国的情况，认为我国的许多盆地存在工业性页岩气藏发育的基本地质条件，其中，吐哈盆地吐鲁番坳陷的水西沟群是页岩气发育的重要区域之一。

RESERVOIRING MECHANISM OF SHALE GAS AND ITS DISTRIBUTION

The reservoiring mechanism of shale gas is of the features of both the coalbed-adsorbed methane and the conventionally trapped gas reservoirs,it showing a complicated multiple-mechanism gradation character. In the reservoiring process of shale gas,the occurrence manner of the gas and the reservoiring type were gradually changed,and the abundance and enrichment degree of the gas were gradually increased. An whole process of the formation and evolution of shale gas reservoir may be divided into three stages,i.e. the absorption and accumulation stage,the expansion and cracking stage and the piston-like driving or displacement-like migration stage. Relevant change in reservoiring condition and mechanism could control and influence the formation and distribution of shale gas reservoirs and the lithologic change and fracture development status played a control role in the occurrence and distribution of the gas in shale gas reservoir. The basic geological conditions of forming commercial shale gas reservoirs exist in many basins in China,in which Shuixigou Group in Tulufan Depression of Tuha Basin is one of the important horizons of shale gas generation.