From the perspective of reservoir identification and production，the lower limits of reservoir physical properties are divided into four types：“reservoir”，“oil-bearing reservoir”，“produced reservoir”，and“effective reservoir”. Based on the reservoir percolation theory，comprehensively considering the percolation response characteristics of different-scale pores and the difference in minimum flow pore diameters under the driving pressure，theoretical discussion and case analysis were performed on the connotation and determination method of four lower limits of reservoir physical properties. The research results show that：①the lower limits of physical properties of“reservoirs”，“oil-bearing reservoirs”，“produced res? ervoirs”，and“effective reservoirs”are respectively the boundaries between reservoirs and non-reservoirs，between oilbearing and non-oil-bearing reservoirs，between produced and non-produced reservoirs，and between effective and ineffective reservoirs. The porosity and permeability increase in the sequence of“reservoirs”，“produced reservoirs”，“oil-bearing reservoirs”，and“effective reservoirs”. ②The lower limits of physical properties of“reservoirs”，“oil-bearing reservoirs”，and“produced reservoirs”respectively correspond to the minimum flow pore diameters of theoretical percolation，charging percolation，and production percolation and can be determined by the minimum flow pore diameter method. ③The lower limits of physical properties of“effective reservoirs”have a low correlation with the minimum flow pore diameter under the test percolation and are mainly limited by the industrial oil flow standard. They need to be determined with the physical property analysis of cores，tests，and production test data. The simple study on the lower limits of physical properties of“effective reservoirs”has gradually shifted to a comprehensive study on the lower limits of physical properties of“reservoirs”，“oil-bearing reservoirs”，“produced reservoirs”，and“effective reservoirs”，which is an important direction for in-depth research on the lower limits of reservoir physical properties.