Abstract: In order to obtain the controlling factors of reservoirs and gas productive concentration rules,the formation and evolution of Metejan fracture are studied by layer flattening technique.From the study,the forming period and scale of Palaeostructure and Neotectonics are clarified.Through the study of the timespace relationship between gas generation,migration and formation,the main controlling factors of reservoirs are found.The research result shows that Neotectonics have little effection on the formation of gas reservoir,while Paleostructure have more effects on the formation of gas reservoir.The size of Paleostructure determines the reservoir scales and gas distribution.The research on controlling factors of reservoirs has clarified the gas reservoir type and highyield & enrichment rules.Wells located in super or upslope of Paleostructure have high level of production and better physical property.On the contrary,wells located in the bottom or downslope have a low level of production and poor physical property.

Key words: Palaeostructure, Metejan, hydrocarbon accumulation, productive concentration rules, layer flattening