六盘山盆地与酒西盆地成藏条件对比

A COMPARISON OF RESERVOIRING CONDITIONS BETWEEN LIUPANSHAN AND JIUXI BASINS

研究认为,六盘山盆地与酒西盆地具有相似的构造演化特征和油气成藏条件。中生代为走滑拉分盆地,发育张扭伸展断层系,新生代为陆内前陆盆地,发育扭压逆冲断裂系;中生代坳陷都发育生烃潜力较好的白垩系烃源岩,具有相似的烃源岩演化特征、生储盖组合条件和油气运聚特征。因此,分析酒西盆地油气藏分布特征和成藏控制因素,有利于认识和预测六盘山盆地的油气分布规律,以便指导下一步的油气勘探。

Studies show that structural evolutional characteristics and reservoiring conditions are similar in Liupanshan and Jiuxi Basins. Both of them were strike slip extensional basins with well-developed transtensional extensional fault systems in Mesozoic and were intracontinental foreland basins with transpressional overthrusting fault systems in Cenozoic. Cretaceous source rocks with good hydrocarbon generating potentials are well developed in the Mesozoic depressions in both basins, which have similar evolutional characteristics of source rocks, source-reservoir-cap rocks combinations and characteristics of hydrocarbon migration and accumulation. Thus hydrocarbon distribution patterns in Liupanshan Basin can be understood and predicted based on analysis of reservoir distribution and control factors of reservoiring in Jiuxi Basin, so as to guide future exploration.