Abstract: The major reservoir of Permian He-8 section in Suligemiao gas field is a deposit with medium sands, coarse sands and fine conglomerate. The complicated course of Diagenesis results in the complexity of pore development in the reservoir. This paper presents the analysis of major controlling factors of the pore development by means of multiple stepwise regression analysis in order to guide the further exploration. The result shows that the porosity of sandstone reservoir in the studied area is mainly controlled by both sedimentation and diagenesis. This method and conclusion could not only be as a guide for further exploring the favorable reservoir, but also offer positive basis for reference for similar study of other areas.

Key words: Suligemiao gas field, Permian, reservoir rock, porosity, controlling factor, multiple stepwise regression analysis