焉耆盆地位于塔里木盆地和吐哈盆地之间 ,其含油气系统经历了侏罗纪—白垩纪的形成与破坏阶段和第三纪—第四纪的活化与再建阶段。侏罗系水西沟群煤系在八道湾组沉积末时 ,进入生油门限 ,标志着焉耆盆地含油气系统的形成。燕山运动中晚期 ,侏罗系大规模冲隆及剥蚀 ,侏罗系源岩生烃作用终止 ,含油气系统被破坏。喜山期 ,盆地进入挤压阶段 ,随着第三系沉积厚度的不断加大 ,侏罗系源岩开始二次生烃 ,原含油气系统得以活化与重建。由于构造演化不均衡 ,南部凹陷具有“早期成藏 ,破坏严重 ,二次生油范围小 ,砂体不发育 ,油气富集程度低”的特点 ;北部凹陷具有“早期成藏 ,破坏较弱 ,二次生烃范围大 ,砂体发育 ,油气富集程度较高”的特点。因此 ,油气勘探时 ,应注意南、北凹陷的含油气系统特点 ,区别对待 The Yanqi Basin is located between the Tarim Basin and Turpan-Hami Basin. Its petroleum system underwent the stages of Jurassic-Cretaceous formation and destruction and the activation and reconstruction of the Tertiary and Quaternary. Jurassic Shui Xigou coal measures at the end of the deposition of the Badaowan Formation entered the oil production threshold, marking the formation of the Yanqi Basin petroleum system. Late Yanshan movement, Jurassic large-scale erosion and erosion, the end of the Jurassic source rock hydrocarbon generation, petroleum system is destroyed. During the Himalayan period, the basin entered the compression stage. As the sedimentary thickness of the Tertiary system increased, secondary hydrocarbon generation began to occur in the Jurassic source rocks, and the original petroleum system was activated and rebuilt. Due to the unbalanced tectonic evolution, the southern depression has the characteristics of “early gas accumulation, severe destruction, small secondary oil generation range, undeveloped sand bodies and low degree of hydrocarbon enrichment.” The northern depression has the characteristics of “early accumulation and weak destruction, Secondary hydrocarbon generation range, sand body development, a higher degree of hydrocarbon accumulation ”features. Therefore, during oil and gas exploration, attention should be paid to the characteristics of petroliferous systems in the south and north sags, and treated differently