The major controlling factors and pool-forming pattern of oil and gas reservoirs in Kuqa petroleum system, Tarim basin

Cenozoic Kuqa for eland basin was developed in the Paleozoic continental margin and Mesozoic inter continental depression, in which there are some E-W fault belts. The structural styles of the basin are mainly composed of anticlines and fault relative anticl ines. The structures formed their rudiment in the end of the Cretaceous period a nd finalized their shapes in Kuqa-Xiyu stage. There are abundant oil and gas resou rces in Kuqa petroleum system, in which 8 oil and gas fields have been discovere d, such as the huge Kela 2 gas field. The pool-forming mechanism and patterns a re various in different tectonic belts of Kuqa petroleum system. So it needs dif ferent exploration strategy. It must enhance the exploration in deep structures and give synchronously attention to shallow structures in Kelasu structural belt . The keystone exploration is gas condensate and wet gas in Yinan region, but co ndensate and oil in Yiqikelike fold belt. In Tabei uplift the condensate-pools should be the main exploration target.