Water Flooding Studied by Measuring NMR Two-Dimensional Distribution Function
水驱油过程的核磁共振二维谱研究

The distribution of water and oil is a very important property of porous media such as rock cores. The study on water flooding is an essential part in the research of enhanced oil recovery (EOR). Nuclear magnetic resonance (NMR) diffusion-relaxation two-dimensional (2D) distribution function (spectrum) provides a large variety of information of fluids in porous media. Compared with NMR 1D relaxation spectrum, the 2D spectrum greatly improves the ability to separate water from oil. In this article, two sets of core flooding experiments were conducted. The relaxation spectra of water were extracted from the 2D spectra acquired with different oil saturations,and used to calculate wettability and distribution of water and oil in different pores under the condition of higher oil viscosity. It was shown that the difficulty of oil and water separation by traditional 1D NMR relaxation spectrum can be overcome by using the 2D method.