鄂尔多斯盆地延长组坡折带对岩性油藏的控制

通过对鄂尔多斯盆地三叠系延长组层序地层研究发现,在盆地的缓坡边缘发育沉积坡折带。盆地延长组沉积坡折带整体上北西-南东方向分布,其中北部坡折带窄且坡度陡,向东部逐渐变宽、变平缓。在此基础之上,探讨了沉积坡折带对岩性油藏的控制作用,认为控制作用主要表现在三个方面：①对储集层砂体组合类型和分布规律以及物性的控制,②对油藏封堵层—— — 湖泛层空间展布的控制,③对油气运移方向和聚集空间的控制。

Effects of Triassic Yanchang Slope Break on Lithologic Reservior in Ordos Basin

The study on the sequence stratigraphy of Yanchang formation of Triassic in Ordos basin shows that there exist sedimentary slope break in margin of ramp belt of the basin. The slope break assumes NW-SE trending distribution. The slope break in the north is narrow and steep, toward the east, it becomes broad and gentle. This paper discusses the effects of the sedimentary slope break on the lithologic reservoir in Ordos basin in three aspects: 1)the control of the sand combination type, distribution and physical properties of the reservoir; 2)the control of the spatial distribution of the blocking stratum-flooding stratum, and 3)the control of the oil-gas migration directions and gathering spaces.