Abstract: A comprehensive evaluation of Zao-V oil measure of Upper Kongdian formation in Shengjiapu oilfeld in aspects of rock type, petrophysical property, pore structure and heterogeneity is made, based on analyses of core thin-section, cast thin-section and capillary pressure parameters, together with well log interpretations. Study shows that the rock type of Zao-V oil measure is mainly lithic feldspartharenites, secondly feldsparthic sandstone and lithic feldsparthic greywacke, with medium porosity and permeability; the petro-physical property is controlled by sedimentary microfacies, median size and shale content, etc. It is concluded that Zao-V oil measure is of distinct plane, inter-layer and inner-layer heterogeneities, and could be classified into four types of reservoirs, of which type-II and type-III are the major reservoirs, and type-II reservoir is the best in quality.

Key words: Dagang oilfield, pore structure, physical property parameter, heterogeneity, evaluation