鄂尔多斯盆地延长组湖盆中部长6厚层砂体成因分析

笔者对鄂尔多斯盆地湖盆中部地区延长组长6物源分析、沉积相类型、坡折带控砂、砂体分布规律等进行了研究。东北、西南两大物源提供了充足的物质基础,发育三角洲牵引流作用的沉积砂岩和重力搬运的浊积砂岩,主要为叠置水下分流河道、河口砂坝-水下分流河道和滑塌浊积岩等不同类型的砂体组合,形成了垂直湖岸线和平行湖岸线展布的巨型厚砂岩分布带。

Origin of Chang 6 thick-bedded sand bodies of the Yanchang Formation in the central Ordos basin

The authors studied the material source, characteristics of sedimentary facies, sand control in the slope-break zone and distribution of Chang 6 sand bodies of the Yanchang Formation of the central Ordos lake basin. The source of sand bodies comes from the northeast and southwest. There are sandstone deposited by deltaic traction current action and turbidite sandstone deposited by gravitational transport. The sedimentary facies include superposed submerged distributary channels, mouth bars, distal bars and turbidite. The direction of distribution of the thick sand bodies is vertical or parallel to the lakeshore line.