File Entry: Application of 2D NMR Techniques in core analysis

This review paper introduces 2DNMR pulse trains frequently used in core analysis and their applications, as well as relevant relaxation mechanisms. 2D NMR technique content of D-T2 sequence, T1-T2 sequence and 2D NMI technology which can be used to measure the property parameters of formation fluid and the physics parameters directly, such as diffusion coefficient, relaxation time, oil saturation, porosity, permeability and so on. The 2D NMR map can also be used to distinguish between oil, gas and water. Introduction Crude oil, water and gas from core are rich in hydrogen nuclei; one-dimensional NMR technique is to measure the T2 relaxation time. Most of time the oil and water T2 relaxation time will be overlap, it’s difficult to distinguish, restricted the NMR technology in core analysis. In recent years, 2D NMR technology have developed rapidly.2D NMR testing give two dimensional information at once experiment, it give more information. This method opens a new area of core analysis. Using the two parameter (transverse relaxation time T2, longitudinal relaxation time T1, fluid diffusion coefficient D), it can distinguish between oil, gas and water easily. Methods and Principles 1. D-T2 Sequence