鄂尔多斯盆地红河油田长8油层组储层流动单元研究

Reservoir Flow Units of Chang-8 Oil-Bearing Formation in Honghe Oilfield,Ordos Basin

在高分辨率层序分析的基础上,利用孔隙度、含油饱和度、流动系数3个参数,将流动单元划分为E、G、P 3类,采用序贯高斯模拟方法建立了流动单元的三维模型;分析了流动单元的垂向叠置样式与侧向分割特征,探讨了流动单元的成因类型与主控因素。认为：1G类流动单元为骨架流动单元,其平面分布受沉积微相控制,E、G类流动单元沿水下分流河道中心分布,P类流动单元分布在水下分流河道的边缘;2隔层为水下分流间湾微相泥岩,界面类型为沉积界面;岩性夹层为砂体内部发育泥质条带或泥砾,物性夹层是由成岩作用形成的非渗透岩层;3中期旋回中上部的SSC1~SSC2短期旋回主要发育单一型流动单元,流动单元在侧向上直接与非渗流层（隔层）接触,流动单元与隔挡层之间存在明显的界面;4中期旋回中下部的SSC3~SSC5短期旋回主要发育复合型流动单元,流动单元之间在侧向上没有明显的分隔界面,只是侧向相邻流动单元的渗流条件不同。

On the basis of the analysis of high resolution sequence stratigraphy,flow units are divided into E,G and P types in terms of porosity,oil saturation and flowability coefficient.Sequential Gauss Simulation Approach is adopted to build a 3-D flow unit model.After a careful analysis of the vertical stacking patterns and the lateral segmentation features of flow units as well as discussion of the genetic patterns and controlling factors,it is believed that：1The plane distribution of type G-the main flow units-are controlled by sedimentary microfacies,while type G and E distribute around the center of underwater distributaries channel,and type P distribute around the edge.2 With sedimentary interface,the interlayers are mudstones of underwater distributaries bay.The lithologic layers are composed of internal sand body shale strips or mud and gravels,while the physical layers are composed of non-permeable rocks formed by diagenesis.3The single flow units lie at SSC1-SSC2short-term cycle in the middle and lower part of the midterm cycle.When flow units contact with non-seepage layer in the upper lateral side,there is obvious interface between flow units and barrier layer.4The composite flow units lie at SSC3-SSC5short-term cycle in the middle and lower part of the midterm cycle.There is no clear interface between flow units in the upper lateral side,except for different seepage conditions of lateral adjacent flow units.