Reservoir characteristics of the major oil bed of third member of Hetaoyuan formation in B area of Gucheng oilfiled

The sedimentary and structure characteristics, lithology characteristics, reservoir characteristics, pore texture and pore types of the reservoir of B area of Gucheng oilfield have been studied through analyzing the core, thin sections with the method of scanning electron microscope and mercury intrusion method etc. The result indicates the sandstones mainly consist of arkoses. The multiple sedimentary microfacies includes:underwater distributaries channel,river mouth bar, sand sheet etc, belonging to the fan delta. The pore types include residual inter-particle pores, and secondary dissolution pore, most are rough pore throat. Between porosity and permeability of the investigated area, there are good positive correlations. The physical properties of the reservoirs are controlled by sedimentary microfacies, sedimentary composition, compaction, corrosion etc.