天山南北前陆冲断带油气地质条件对比及有利勘探领域分析

天山造山带南北两侧分布着库车和准噶尔南缘两个中、新生代前陆冲断带。天山造山带的形成与演化对于其两侧盆地的展布、基底性质、沉积盖层的规模、盆地整体结构特征、后期破坏等具有重要的影响和控制作用。在同一区域构造应力场的作用下,库车前陆冲断带和准噶尔盆地南缘地区构造演化和石油地质条件均表现出许多相似的特征,两者皆发育多套成熟烃源岩,叠置了多套优质储盖组合,发育多种类型的圈闭,生储盖条件配套良好,具备形成大型油气田的物质基础。

Comparison of Oil-gas Geologic Condition between North and South Foreland-thrust Belts in Tianshan Mountains and Favorable Exploration Target

Mesozoic-Cenozoic foreland thrusting belts occurred in Kuqa and in the southern margin of Junggar Basin, distributed in both north and south sides of Tianshan orogenic belt, whose formation and evolution have heavily affected and controlled the basins distribution, basement property, the scale of sedimentary cover and texture feature of whole basin and late destroying distributed in its both sides. In the process of same one regional stress field, the tectonic evolution and oil and gas geologic condition of Kuqa foreland thrusting belt and the southern margin of Junggar Basin all show much similar characteristics, both of them developed multi-set mature source rocks, and formed multi-set high-quality reservoir-cover combinations, and developed various traps. Because the relation among source rock, reservoir and cover is well matched, providing the material basement for forming large oil and gas fields.