Abstract: Based upon the interpretation for well logging data from the Upper Paleozoic Central Gas Fields of the Erdos Basin, it is suggested that the sandstones of the Permian Shihezhi and the Shanxi Groups can be distinguished mineralogical1y into quartz sandstone and lithic sandstone. The matrix parameters of these two sandstones are estimated to be Pmax= 2.65g／cm^3, △tmax=182μs／m and Pmax=2.7g／cm^5, △tmax=164μs／m respectively. Porosity values were calculated by both density-minimum acoustic wave porosity and empirical equation methods. The density minimum acoustic wave time difference porosity method with an equation of φ＝min(φμ,φs) appears to have yielded the best results. The calculations for permeability were performed by medium value of grain size, specific surface of rocks and bound water methods. The best results seems to have been given by the regressions between medium value of grain size, porosity and relative natural gamma values with the following equations: lgK=1.313+1.005lgφ+1.298lgMd, lgMd=-0.0736-0.02△GR, and △GR=(GR -GRmax )／(GRmax-GRmax) The calculations have been we1l verified by the practica1 data from 66 wells.