准噶尔盆地冲积扇储层流动单元研究

储层流动单元研究可以更好地预测剩余油的分布,指导油田开发.以准噶尔盆地百口泉油田百21井区百口泉组冲积扇相储层为例,利用岩心、测井资料开展流动单元研究,在储层细分对比的基础上,采用定性与定量相结合的方法将研究区流动单元分为E,G,F,P等4种类型.描述了各类流动单元孔隙结构特征、空间分布规律及其与沉积微相间的相互关系.总结出冲积扇流动单元模式,并分析了各类流动单元与剩余油分布的关系.研究表明:冲积扇储层中E类流动单元多分布于主槽流沟的中心部位;G类流动单元多呈宽带状分布于主槽微相的沟间滩及侧缘槽微相砂体的侧翼;F类流动单元一般都在辫流砂岛、辫流滩地;P类流动单元一般分布在扇间滩地或漫洪、漫流带.剩余油多分布于横向渗流屏障附近流动单元的边缘部位和流动单元接合处.

Study on the flow units of alluvial fan reservoir in Zhungeer Basin

The study on flow units can predict remaining oil distribution and guide the development of oilfields.The flow units in the alluvial fan reservoir of Baikouquan Formation in Bai-21 wellblock of Baikouquan Oilfield,Zhungeer Basin are divided into 4 kinds of E,G,F and P based on core and well-logging data.In the research of the flow units,qualitative methods and quantitative methods are combined on the basis of sequence stratigraphic division and correlation.The pore structure characteristics and the spatial distribution of the flow units,and the relationship between the distribution of various kinds of flow units and micro-facies are studied.The model of the alluvial flow units is summed up.The relationships between remaining oil and various kinds of flow units are researched.It is shown that E kind of flow units mainly distribute in the central part of main stream channel;G kind of flow units present wide-band distribution in the broadside of inter channel plain and channel lateral margin;F kind of flow units commonly distribute in braided cay and braided bottomland.P kind of flow units generally distribute in inter-fan bottomland and sheet flood or overflow area.Remaining oil is the most probably in G kind of flow units,more probably in F kind of flow units,and then in E kind of flow units.Remaining oil is the least probably in P kind of flow units.Remaining oil mostly distributes at the junctions of the flow units and the boundary positions of the flow units near the lateral vadose barriers.