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首页> 外文期刊>Applied Magnetic Resonance >The Observation of Residual Oil Evolution During Waterflooding Using NMR D-T (2) Maps
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The Observation of Residual Oil Evolution During Waterflooding Using NMR D-T (2) Maps

机译：使用NMR D-T（2）图观察注水过程中残余油的逸出

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摘要

By supplementing standard relaxation time measurements with diffusion information, nuclear magnetic resonance (NMR) D-T (2) mapping provides a powerful tool for characterizing fluids in a core. In this study, a D-T (2) mapping technique was designed and applied to investigate waterflooding behavior and pore-level residual oil distributions. NMR measurements were conducted at different stages of the waterflooding process, and corresponding D-T (2) maps were acquired. The oil and water signals were easily separated using a diffusion coefficient cut-off of 3 x 10(-6) cm(2)/s. The oil saturation values measured via the NMR method were highly consistent with the volumetric method results. The pore-level residual oil distributions could be calculated by analyzing the oil T (2) spectra during waterflooding. The injected water was found to preferentially displace oil in large and medium-sized pores having relatively low capillary pressures. The final residual oil saturation measured via the NMR method was 18.9 %, with 15.7 % occurring in medium-sized pores (10 ms < T (2) < 100 ms).
机译：通过用扩散信息补充标准弛豫时间测量，核磁共振（NMR）D-T（2）映射提供了一种强大的工具，可用于表征岩心中的流体。在这项研究中，设计了一种D-T（2）映射技术，并将其用于研究注水行为和孔隙水平的剩余油分布。在注水过程的不同阶段进行了NMR测量，并获得了相应的D-T（2）图。油和水信号很容易使用3 x 10（-6）cm（2）/ s的扩散系数截止值进行分离。通过NMR方法测得的油饱和度值与体积法结果高度一致。孔隙水平的剩余油分布可以通过在注水过程中分析油的T（2）光谱来计算。发现注入的水优先置换毛细压力相对较低的大中型孔中的油。通过NMR方法测得的最终残余油饱和度为18.9％，其中15.7％发生在中等大小的孔隙中（10 ms

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