塔里木库车含油气系统油气成藏的主控因素及成藏模式

库车前陆盆地在古生代被动陆缘和中生代陆内坳陷基础上发育,属于新生代陆内前陆盆地,内部发育多条东西向断裂带,最重要的构造样式是背斜和断层相关背斜,白垩纪末形成构造雏形,库车期-西域期定型.库车含油气系统具有丰富的油气资源和优越的成藏条件,已发现克拉2特大型气田等8个油气田,不同构造带具有不同的成藏机制和成藏模式,需要采取不同的勘探策略.克拉苏构造带深、浅构造垂向变异显著,必须加强深层天然气藏的勘探,可以兼探浅层;依奇克里克构造带之依南地区勘探的重点应是寻找凝析气和湿气等天然气藏;依奇克里克背斜带应主要寻找背斜和断背斜型凝析油、黑油油藏;塔北轮台断隆带主要应寻找断背斜型凝析油气藏.图7参7(田作基摘)

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.