塔北前陆盆地与南天山造山带的耦合关系及油气分布特征

南天山造山带和塔北前陆盆地是一对共轭的、正负相依的构造地貌单元,它们自北而南分为6个构造单元:拉尔墩基底卷入厚皮冲断带、哈尔克山褶皱冲断带、库勒前缘叠瓦冲断带、拜城—阳霞前渊坳陷带、塔北前陆斜坡带和塔中前缘隆起带。南天山造山带和塔北前陆盆地的发育演化共同控制了塔北前陆盆地的沉积特征、变形特征和构造样式。塔北前陆盆地油气资源丰富,成藏条件优越;油气分布主要受含油气系统和区域盖层控制,克拉苏构造带、依奇克里克构造带、秋立塔格构造带和塔北轮台断隆带等4个构造带是油气最富集的构造带;已发现克拉2特大型气田等多个油气田,预计仍能发现更多的大油气田。

Coupling Relation between Tabei Foreland Basin and Nantianshan Orogenic Belt and Their Oil-gas Distribution Feature

Nantianshan orogenic belt and Tabei foreland basin is a pair of structural unit with conjugated and positive-negative dependence on each other, which can be divided into six structural units, including Laerdun deep thrusting zone resulted from basement engulfing, Haerkeshan fold thrusting zone, Kula front imbricate thrusting zone, Baicheng-Yangxia foredeep depression zone, Tabei foreland slope zone and Tazhong front uplift. The evolvement of Nantianshan orogenic belt and Tabei foreland basin controlled together the sedimentary characteristics, deformation feature and structural styles of Tabei foreland basin.Oil and gas resources is rich in Tabei foreland basin, which has favorable reservoir-forming conditions. The distribution of oil and gas is mainly dominated by petroleum system and regional cover. There are four structural zones with oil-gas enrichment, which include Kelasu structural zone, Yiqikelike structural zone, Qiulitage structural zone and Luntai fault-uplift zone, where Kale-2 ultra-large gasfield and other several oil and gas fields are discovered, and the added large oil and gas fields will be discovered.