大港油田官142断块巨厚砂岩的储层流动单元

以黄骅坳陷官142断块中生界油藏为例,探讨巨厚砂岩储层流动单元的研究方法。巨厚砂岩储层流动单元研究包括两个层次,一为确定渗流屏障和连通体的分布,二为连通体内部储层渗流差异分析。研究表明,官142断块渗流屏障主要有泥质屏障、钙质砂岩胶结屏障和钙质砂砾岩胶结屏障3种类型。通过对连通体内部砂体渗流差异性分析,将连通体划分为3类流动单元。其中A类流动单元以粗孔、粗喉类型为主,渗流性能好,吸水强度大;B类流动单元储层为中孔、中喉型,渗流性能中等,吸水强度次之;C类流动单元储层多为粉细砂岩、砂砾岩或钙质胶结稍差的储层,吸水强度较差。通过流动单元的划分与研究,对预测该区的剩余油分布规律和优化调整方案提供依据。

Research on Flow Units of Thick Sandstone Reservoir in Fault Block Guan 142 of Dagang Oilfield

Taking the example of the Mesozoic reservoir in fault block Guan 142 of Huanghua depression,this article discusses the methodology of flow units in thick sandstone reservoir.The research of flow units in such reservoirs can be divided into two ranks,one is to make sure the distribution of seepage barrier,the other is to analyze the differentia of fluid flow in the inner connected sands.The results show that three types of barriers have developed in the fault block Guan 142:pelitic barrier,calcareous sandstone and calcareous glutenite.Through the analysis of differentia of fluid flow,the inner connected sands can be classified into three types of flow units,of which type A with wide pore and big throat has good permeable property and high intensity of water injection;type B has middle pore and throat,so the ability of its permeability and water injection takes the second place;type C is the worst flow unit,for it is mainly composed of siltstone or reservoir with loose calcareous cementation,and hence with the worst water injection.Based on the above analysis,the identified model of permeable barriers and the discriminant function of flow units have been set up,which can be applied to forecasting the distribution of residual oil and optimizing the development scheme.