小洼油田洼38块东二段低含油饱和度油藏成因研究

Genesis of the low oil saturation reservoirs in the Eogene Dong 2 formation of the Wa 38 block in the Xiaowa oilfield

洼38块东二段油层采取直井热采方式开发,投产初期即进入中含水期开发阶段。为进一步改善油藏开发效果,探索提高采收率新途径,综合运用动态分析、核磁共振以及数值模拟等技术手段,详细分析了东二段油层低含油饱和度油藏特征,并根据油气运移机理及油藏工程理论等进行系统分析。结果表明,该块含油饱和度偏低主要受油气供给程度、沉积环境、构造幅度、边水入侵、微观孔隙结构、矿物润湿性以及构造运动等多种因素影响。此次研究结果为研究区的高效开发提供部分依据。

The Eogene Dong 2 reservoir in the Wa 38 block has been developed by vertical well thermal recovery and was medium water cut in the initial production stage.This paper systematically analyzes the characteristics of the low oil saturation reservoirs in the Eogene Dong 2 formation in respects of hydrocarbon migration and reservoir engineering by integrating dynamic analysis,nuclear magnetic resonance and numerical simulation in order to improve reservoir development effect and explore new ways of enhancing oil recovery.It is thought that the low oil saturation in this area is affected by many factors including hydrocarbon feed degree,depositional environment,structure relief,edge water invasion,micropore structure,wettability,tectonic movement,etc.The result of this study provides certain basis for efficient development of the study area.