Abstract: The reservoir of T2 member in Dingbei block in Ordos basin is characterized by super-low porosity, super-low permeability, developed intergranular dissolved pores, high quartz content and wide-distribution fractures. The special sandstone reservoir in this area causes the fact that the sensitivity of acoustic transit time to porosity is greatly influenced by shale content, the response of resistivity to petrophysical property conceals the response to pore fluids; distortions of the acoustic logs, density logs and neutron logs often appear in layers or zones with fractures and irregular hole diameter, and the “excavation effect” of neutron logging has to be explained in multiple solutions. This paper proposes a method for hole diameter correction using the resistivity curve, by which, integrated with the acoustic, density and neutron logs, the sandstone porosity of T2 member in this area is interpreted for the purpose of effective identification of the gas reservoir