Two-Dimensional NMR Spectroscopy for Observing Rock Wettability

Abstract

Abstract:

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.

Key words: NMR, two-dimentional spectroscopy, wettability, diffusion coefficient, relaxation time

CLC Number:

O482.53

MENG Xiao-Hai, JIANG Zhi-Min, SHI Jing-Sheng, QU Yan-Tao, WANG Wei-Min. Two-Dimensional NMR Spectroscopy for Observing Rock Wettability[J]. Chinese Journal of Magnetic Resonance, 2012, 29(2): 190-200.

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