Reservoirs of clastic rocks are well developed in the Tarim basin and distributed mainly in the Donghe sandstone at the base of the Carboniferous, Triassic and Jurassic basal sandstone and Cretaceous and Eogene basal sandstone. The opening spaces of the reservoirs are dominantly of pore type and, in a few cases, of fracture type. Pores may fall in two types, with primary pores predominating in Mesozoic and Cenozoic strata and secondary pore in the Paleozoic. The secondary pores are dominated by intragranular and intergranular pores. There are several types of diagenesis, of which supergene leaching, dissolution caused by acid released by low-mature organic matter and dissolution and precipitation caused by acid produced by deep-seated thermo-chemical sulfate reduction are the most important factors affecting the physical properties of reservoirs. The paper discusses the origin of high-quality reservoirs produced under the conditions of deep burial of clastic rocks in the Tarim basin. The authors consider that the Tarim basin is characterized by special geological conditions, i. e. low geothermal gradients, rapid subsidence and short-term deep burial of the rocks after the Neogene, dissolution of rock grains and ground-mass by acid formation water and unconformities and fracture systems formed by multiple tectonic movements, which have improved the performance of the reservoirs. The favorable sedimentary facies belt has provided a good material basis for the develop of the high-quality reservoirs.