Abstract: The petrophysical property of Triassic reservoir in Arkekule are in Tarim basin is controlled by sedimentary facies, with the better of the middle oil layer and the poor of the upper oil layer as well as sandstone of medium throat radius. The porosity of sandstone reduces by about 25%, due to influences of cementation and compaction (sorting and diagenesis), whereas the porosity of Triassic reservoir increases by about 12% for dissolution. It is concluded that the diagenesis stage has been up to stage-B of late diagenesis.

Key words: Tarim basin, Arkekule, secondary porosity, diagenesis, chlorite