Abstract: Luojiazhai gas field is composed of Luojiazhai structure and Gunziping structure, and is the most important gas field in northeast Sichuan. Feixianguan Formation reservoir in Triassic is the best carboniferous successor in Sichuan basin. On the initial exploration, a lot of excellent image logging data and regular logging data are obtained. The following conclusions are obtained based on analysis of the criteria for the classification of the reservoir, fluid properties of discrimination and single well productivity forecast, i.e, Feixianguan Formation reservoirs are dolomite Karst pores and caves oolitic shoal reservoirs, reservoir spaces include a variety of pores, caves and fractures. Luojiazhai structure is porous reservoir and Gunziping structure is fracturedporous reservoir. All abovementioned provide the basis for further development.

Key words: reservoir, well logging, evaluation, fluid properties, productivity forecast, Luojiazhai