一维核磁共振（nuclear magnetic resonance, NMR）测量方法无法分辨驱替过程中油水弛豫信号，因此采用T₁-T₂二维核磁共振测量方法分辨岩心中流体类型及分布。通过驱替实验研究聚合物BRH-325和表面活性剂GSS-A复合体系分别在65、70、75 ℃条件下的驱油效果，并利用纵向弛豫-横向弛豫（T₁-T₂）二维NMR测量方法对岩心内部的油水两相驱替规律及分布特征进行可视化研究，并对比实验测量结果与NMR测量结果。结果表明：70 ℃下，复合驱提高采收率的效果最为明显。因此，T₁-T₂二维核磁共振能够直接、直观区分驱替过程中油水的弛豫信号。

The one-dimensional nuclear magnetic resonance (NMR) method cannot distinguish the relaxation signals of oil and water during flooding, so longitudinal relaxation-transverse relaxation (T₁-T₂) two-dimensional NMR method was used to distinguish the type and distribution of fluids in the cores. The enhanced oil recovery (EOR) of the SP flooding system consisting of polymer BRH-325 and surfactant GSS-A was studied by flooding experiments at 65, 70, 75 ℃, respectively. T₁-T₂ two-dimensional NMR method was used to visually study the flooding law and distribution characteristics of oil and water in the cores. And the experimental measurement results were compared with the NMR measurement results. The results indicate that the SP flooding has the most significant effect on EOR at 70 ℃. Therefore, T₁-T₂ two-dimensional NMR can easily and clearly distinguish the relaxation signals of oil and water during flooding.