塔里木盆地北缘库车再生前陆褶皱逆冲带中丘里塔格前锋带的构造与油气

丘里塔格背斜带是库车再生前陆褶皱逆冲带的前锋构造带。依据各段不同的构造特点,沿走向自东向西可分为东丘里塔格段、库车塔吾段、南、北丘里塔格段和亚克里克—阿瓦特段。其中东丘里塔格段和库车塔吾段以浅部膝折褶皱或断层传播褶皱与深部的断层转折褶皱相叠置为特点。而南、北丘里塔格段和亚克里克—阿瓦特段则以发育膝折褶皱、断层传播褶皱、断层转折褶皱以及相伴生的纵向走滑逆冲断层为特点。该构造带有良好的油气前景,寻找深部完整的断层转折褶皱背斜圈闭以及纵向走滑逆冲断层下盘的圈闭是重要的勘探方向。

Structures and Petroleum Accumulation in the Qiulitag Thrust Front of the Kuqa Rejuvenated Foreland Fold-Thrust Belt on the Northern Margin of the Tarim Basin

The Qiulitag anticlinal zone is the thrust front of the Kuqa rejuvenated foreland fold-thrust belt. According to the structural features of this zone, it is divided into the East Qiulitag, Kuqatawu, South and North Qiulitag and Yakelike-Awat segments. The structures of the East Qiulitag and Kuqatawu segments are featured by the superimposition of shallow-seated kink band folds or fault propagation folds and deep-seated fault bend folds. However, the structures of the South and North Qiulitag and Yakelike-Awat segments are dominated by the kink band folds, fault propagation folds, fault bend folds and associated longitudinal strike-slip thrusts. The Qiulitag thrust front is favorable for oil and gas accumulation. The deep fault bend fold traps and traps in the footwall of longitudinal strike-slip thrusts are potential targets.