Abstract: The extensive distribution of carbonate rocks formed abundant potential hydrocarbon resources accounting for over half of the total amount in Cambrian-Ordovician of Tarim basin, where hydrocarbon reservoirs have been discovered and classified into five types, including ten kinds of pools. In view of these reservoir conditions, petroleum sources and evolution analyses, it is believed that individual carbonate reservoir is in not very large scale, and tends to forming a group of oil and gas pools. They are normally characterized by high initial well production, prevailing to condensate gas cap, generally normal temperature and pressure system, multiphase reservoirs and modification by faulting. Hence the distribution of petroleum reservoirs should be controlled by regional structure,reservoir -seal assemblage, faulting and premium hydrocarbon source rocks.

Key words: Tarim basin, Cambrian, Ordovician, Carbonate rock, Reservoir formation, Reservoir distribution, Regularity