The poroperm characteristics of reservoirs in the 3rd upper sub-member of the Silurian Kepingtage Formation in Tazhong.Tarim Basin are described in detail in this paper based on petrology study.The results show that the pores of the reservoirs are mainly of primary residual intergranular pores and the lithologies are dominated by siltstone and fine lithic sandstone.The reservoir poroperm characteristics are affected by carbonate cementation

and the carbonate content presents an evident negative correlation with porosity and permeability.The porosity is more than 9% and permeability is over 2×10

-3

3×10

-3

μm

2

(it is generally accepted that strata with porosity≥9% and permeability≥2×10

-3

and 3×10

-3

μm

2

are reservoirs)and the permeability is in positive linear correlation with the porosity.The horizontal distribution of poroperm characteristic indicates that this reservoirs interval has high porosity and permeability in the southeastern Tazhong areas and its oil/gas distributions are closely related to the poroperm characteristics.Furthermore

favorable plays for petroleum exploration in this reservoir interval are predicted on the basis of relationship between oil/gas distribution and reservoir cha-racteristics.These prediction results point out the directions for further exploration in the area.