Abstract: The condensate gas pool of Ordovician, Carboniferous and Triassic in Lunnan low uplift in Tarim basin belongs to deep and ultradeep condensate gas reservoir. The petroleum geochemistry shows its oil and gas of marine facies originated from the Cambrian-Ordov ician source rocks. The carbonate rock (O) and detrital rock (C,T) could be classified into trapping assemblages of 2 types or 4 subtypes, which allow to form 10 kinds of condensate gas pools. Such variety of condensate pools here was resulted from multi-tectonic movements and multi- stage petroleum accumulations. It is believed that Lunnan low uplift is an area with abundant condensate oil and gas, and is a favorable area for further petroleum exploration in future.

Key words: Tarim basin, Lunnan area, low uplift, condensate gas, reservoir feature