二维核磁共振观测岩石润湿性

润湿性是反映储层中油水分布状况的一个重要表征参数，因此研究储层岩石的润湿性对原油开采有着重要的意义. 扩散弛豫二维谱可展示扩散系数与弛豫时间的相关性，并可以对油水的弛豫时间、扩散系数分别进行研究，与核磁共振一维弛豫谱相比极大地提高了区分油水的能力. 该文首先通过多组实验验证扩散-弛豫二维谱可以很好地观测到油水共存状态下玻璃珠表面的润湿性，继而通过对3组人造岩心表面润湿性的测量，获得了人造岩心表面润湿性的信息，解决了此时单独用一维弛豫谱方法难以区分油水的问题. 利用二维谱观察岩石润湿性的研究对油田提高采收率的研究有较大的参考价值.

Two-Dimensional NMR Spectroscopy for Observing Rock Wettability

Wettability is an important parameter reflecting the water/oil distribution in reservoirs. Studying the surface wettability of the rocks in the reservoir is important for oil recovery. Compared to one-dimensional relaxation spectroscopy, two-dimensional diffusion-relaxation correlation spectroscopy showed greatly improved capability in distinguishing oil and water. In this article, we showed that two-dimensional diffusion-relaxation correlation spectroscopy can be used to measure the surface wettability of glass beads and artificial cores under oil water coexistence. It was shown that oil/water separation in artificial cores could only be achieved by two-dimentional spectroscopy, but not by traditional 1D NMR relaxation spectroscopy. In conclusion, two-dimensional diffusion-relaxation correlation spectroscopy is an important tool to measure rock surface wettability.