孤岛油田馆陶组河流砂体储层宏观特征

在小井距井网条件下,通过精细储层沉积学研究,确定了孤岛油田馆陶组河流储层油砂体和单砂体的宏观储层特征。河流砂体分为主河道、决口水道、充填河道和边缘河道4种微相砂体单元,岩石相主要为粉细砂岩相,成岩胶结程度低。单期河道砂体主要表现为曲流河性质,河道宽度与厚度用单期河道砂体宽度和厚度描述,二者之间为线形关系,砂体内部结构符合点坝侧积体的堆积规律。河流砂体不同微相单元决定了油田高含水期储层物理特性的总体规律。

Macroscopic Reservoir Properties of Fluvial Sand Bodies in the Guantao Formation in Gudao Oilfield

Macroscopic reservoir properties of fluvial reservoir bodies and single sand bodies in the Guantao Formation in Gudao oilfield are determined through fine reservoir sedimentology study under small spacing well pattern conditions.The fluvial sand bodies are classified into4microfacies sand body units including main stem,crevasse channel,filling channel and peripheral channel with silt-stone and fine sandstone facies as the main lithofacies and with low degree of consolidation.Single stage fluvial sand bodies have the characteristics of meander rivers,there exists a linear correlation between the width andthickness of rivers and that of single stage fluvial sand bodies,and the inner structures of sand bodies accord with the accumulation pattern of point bars.Different micro-facies units of fluvial sand bodies control the overall reservoir physical properties at high water cut stage.