通过岩芯及露头观察对鄂尔多斯盆地合水地区延长组长 6 段砂体沉积类型的识别、依据沉积组合对砂体结构进行分类、并结合测井响应特征刻画了砂体结构平面分布，综合分析了砂体结构平面差异的成因。结果显示，合水地区长 6 段主要为深水重力流沉积，可识别出砂质碎屑流和浊流两种不同的重力流沉积类型。两种重力流沉积砂体在纵向上复合叠置形成广泛分布的厚砂体，因组合关系及含油性不同，可分为 3 种砂体结构类型: 多期砂质碎屑流叠加型、砂质碎屑流与浊流复合叠加型及多期浊流叠加型。砂体结构平面分布差异受湖盆底形、物源及供屑量和流体重复改造等因素影响，不同结构砂体平面上具有垂直物源轴线呈带状展布特征，在合水地区东北部和中部形成较为有利的砂体结构类型。

The deposition types of Chang 6 Member of the Yanchang Formation in Heshui area of Ordos Ba- sin，were firstly identified by core and outcrop observations，and then the sandbody structures were classified ac- cording to the combination of deposition types． Furthermore，the distributions of sandbody structure were revealed by logging responses，and the reasons for the plane differences of sandbody structures were synthetically analyzed． The results show that the main deposition type of Chang 6 Member in Heshui area was deep- water gravity flow depo- sition，which can be further divided into sandy debris flow deposition and turbidity current deposition． These two types of gravity flow depositions superimposed vertically，leading to widespread and thick sandbodies，which can be classified as superimposition of multi- stage sandy debris flow deposition，superimposition of sandy debris flow depo- sition and turbidity current deposition，and superimposition of multi- stage turbidity current deposition according to the differences in storage ability and oil enrichment． The distributive difference of sandbody structure effected by the bottom shape of lake basin，provenance，amount of debris and transformation of flow． Different types of sand- body have the belt distribution characteristics of vertical provenance axis，and the favorable sandbodies are in the northeastern and central parts of the Heshui area．