Application of 2D NMR Techniques in Petroleum Logging

Abstract

Abstract:

This review paper introduces 2D NMR pulse trains frequently used in petroleum logging and their applications, as well as relevant relaxation mechanisms. In NMR logging, often a set of data is acquired at different CPMG echo spacing in the presence of constant gradient magnetic field. Twodimensional mathematical inversion is then applied to solve the dataset, yielding two-imensional NMR map (D-T₂). In the meanwhile, 2D NMR technique can be used to measure the property parameters of formation fluid and the petrophysics parameters directly, such as diffusion coefficient, relaxation time, crude oil viscosity, oil saturation, free water saturation, porosity, permeability and so on. The 2D NMR map can also be used to differentiate oil, gas and water, determine internal gradient field in and judge wettability of the sample. 2D NMR techniques offer powerful tools for identifying fluid type in NMR logging.

Key words: 2D NMR, relaxation, dffusion, logging

CLC Number:

O482.53

GU Zhao-Bin, LIU Wei, SUN Dian-Qiang, SUN Wei. Application of 2D NMR Techniques in Petroleum Logging[J]. Chinese Journal of Magnetic Resonance, 2009, 26(4): 560-568.

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