Abstract: Aryskum depression locatedin Kazakhstan is a rift basin developed on the basements of Precambrian metamorphic rocks and Paleozoic carbonate rocks. This depression is very rich in oil and gas resources which enrichment and distribution are controlled by its tectonic feature and evolution. And there are different types of oil and gas reservoirs in lateral and vertical directions in it. This depression is situated within the effective scope of oil-gas migration from central depression to top of arch, favorable for oil-gas accumulation. Thanks to the sound assemblage between the regional cap rocks and the transmission systems, the oil-gas migration and accumulation are efficient in this area. Four models for oil-gas accumulation occur in Aryskum depression, among which the Lower-Middle Jurassic lithologic reservoirs are the main targets for incremental oil-gas reserves.

Key words: Turgay basin, Aryskum depression, rift basin, reservoir type, petroleum accumulation pattern