Abstract:

On the basis of systematical research on the chemical behavior of reservoir minerals in alkaline-flooding agents, the authors put forward a mew idea that alkaline diagenetic setting is favorable for the formation of secondary pores in sandstone reservoir. Furthermore, the authors suggest an “acid-alkaline chain reaction” model for a mono-system, and prove the existance of alkaline diagenetic settings through rock mineral composition analysis and the reference of literatures. Obviously, the idea has positive effect on oil /gas exploration.

Key words: Reservoir mineral, Secondary pore, Alkaline flooding agent