Study on the Minimum Flow Pore Throat Radius and the Lower Limit of Petrophysical Properties of a Reservoir Under Three Seepage States

Through the analysis of the reservoir seepage capacity and high-pressure mercury intrusion porosimetry, the minimum flow pore throat radius and the lower limit of petrophysical properties have been studied. The three seepage state modes include theoretical seepage, production seepage. and filling seepage. The results show that the minimum flow pore throat radius and the lower limit of petrophysical properties of theoretical seepage are the lowest in the three seepage states. The minimum flow pore throat radius and the lower limit of petrophysical properties of theoretical seepage can be used to distinguish between the reservoir and non-reservoir conditions. They can be used to distinguish between the utilized reservoir and non-utilized reservoir under production seepage and to distinguish between oil-bearing and non-oil-bearing reservoirs under filling seepage. Therefore, the reference parameters can be used for the identification of reservoirs and oil-bearing reservoirs and the study of reserves utilization degree.