Abstract: Jiangsu oil field is characterized by reservoirs with several complex minor fault blocks. The arrangement of well patterns for development them is controlled by their configurations in plane distribution, which decide reserves quality in a certain extent. However, they have not been considered completely in current researches of reserves classification. The paper presents a comprehensive reservoir classification method that considers such development and geologic factors as reservoir physical property, distribution, fluid property and reservoir shape, using complexity scientific study and weight assessment. Among them the reservoir plane distribution as an important factor is considered into such a reservoir classification and evaluation in the first place. The results indicate that this factor is of an active effect on the reservoir classification and taken as a guidance for in-depth development of the complex minor fault block reservoirs.

Key words: minor oil-gas field, fault block reservoir, reserve, classification, well pattern