The character of residual oil formed during water flooding, one important technique to enhance oil recovery, is helpful to further study permeability and recovery in tight sandstone oil reservoirs. In this paper, we take a tight sandstone reservoir in Ordos Basin as the research object and use in situ displacement X-CT scanning technology to analyze the dynamic characteristics of oil during water flooding. Firstly, core pore radius and oil storage space radius were measured from digital cores which are acquired in different water flooding stages by X-CT scanning technology. Secondly, analytical and evaluation methods were established to describe fluid distribution in the pore space of the core in different water flooding stages based on curve similarity. Finally, by numerical results, we analyzed the oil distribution features in the process of water flooding for core samples. In this paper, the oil distribution characteristics during water flooding are revealed based on digital core analysis. Also, a quantitative evaluation method is given to provide theoretical guidance.

中文翻译：

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通过数字岩心分析定量研究注水剩余油分布

注水是提高采收率的重要技术之一，注水时形成的残油特征有助于进一步研究致密砂岩油藏的渗透率和采收率。本文以鄂尔多斯盆地致密砂岩储层为研究对象，采用原位驱替X-CT扫描技术分析注水过程中油的动态特征。首先，利用X-CT扫描技术，在不同注水阶段采集的数字岩心，测量岩心孔隙半径和储油空间半径。其次，建立了基于曲线相似度的分析评价方法，描述了不同注水阶段岩心孔隙空间的流体分布。最后，根据数值结果 我们分析了岩心样品注水过程中的油分布特征。本文基于数字岩心分析揭示了注水过程中的油分布特征。另外，给出了定量评估方法以提供理论指导。