鄂尔多斯盆地苏西X 井区盒8 段砂体发育模式研究

砂体内部构型控制流体渗流，影响开发效果。依据现有的储层砂体构型研究方法，通过短期旋回对 比，对苏西X 井区盒8 段分流河道砂体发育特征进行了研究。认为研究区砂体结构类型主要有削截式、 完整式和相对孤立式河道。在上升半旋回内测井曲线多表现为箱形、圣诞树形，下降半旋回内测井曲线多 呈指形；河道砂体在纵向上有一定的叠置现象，在横向上具交织特征；同一条河道砂体在平面上向西迁移 明显。砂体分布特征表现为：砂体宽度与厚度的比值大、弯度小、不连续。据此，总结出4 种河道砂体发育 模式：迁移强叠置型、河道交汇型、相对孤立型和弱叠置型河道砂体。

Study on sand body development model of He 8 member in Suxi X well block of Ordos Basin

The internal architecture of sand body controls fluid flow,which influences development effect.Sand body development model of braided river channel of He 8 member in Suxi X well block was studied according to the existing reservoir sand body architecture research methods and based on short-term cycle comparison in a single stratigraphic framework.Sand body architecture types are classified into truncation style channels,complete channels and relatively isolated channels.The sand body morphology mainly manifests box shape and Christmas tree shape in the rising half cycle,and manifests finger shape mostly in the descending half cycle.In the cross section,the sand bodies which have overlapping phenomenon vertically and intertwined characteristics horizontally are obviously developed.Sand body of the same channel laterally migrated to the west.The sand body distribution is characterized by a big ratio of width and thickness,small curvature and discontinued(effective reservoir sand bodies).Four kinds of sand body development models of He 8 member in the study area were summarized as followings:strong migration of overlaying channel sand body,river intersection channel sand body,relative isolation channel sand body and weak overlaying channel sand body.