断砂耦合对阿尔伯特凹陷北部转换带油气富集的控制作用

Fault-sand coupling controlling effect on hydrocarbon enrichment in the northern transfer zone of Albert sag

阿尔伯特凹陷北部转换带是典型的伸展盆地构造转换带。根据转换带断裂系统、圈闭群、储集层等特征分析,将阿尔伯特凹陷北部转换带划分为封堵型、半封堵型、弱封堵型和散失型等4类主要断砂耦合形式。结合转换带含氮化合物、高度充满度等特征,分析了断层-砂体-盖层耦合对转换带油气运聚方向和富集层位的控制作用,结果表明该地区平面上有NE和NEE向2个油气优势运移方向,纵向上油气优先聚集在S5油组,北部转换带沿油气优势运移方向的F3断层控制带是下阶段滚动勘探重点的有利区带。

The northern Albert sag is a typical transfer zone in an extensional basin. Based on the analyses of fault system, traps and reservoir, fault-sand coupling in the northern transfer zone of Albert sag is divided into four types： sealed model, semi-sealed model, weak sealed model and leaked model. Combined with nitrogen compounds and charge degree in height, the effect of fault, sand and cap rock coupling on hydrocarbon migration and enrich layer of hydrocarbon accumulation characteristics are analyzed in the northern transfer zone. The results show that hydrocarbon migrations have NE and NEE dominant pathways and S5 layer is the preference accumulation in the longitudinal direction. The structures along dominant pathways controlled by F3 fault are main potential areas for future exploration in the northern transfer zone of Albert sag.