Chapter 3: Fundamentals of NMR Petrophysics and Fluids Typing

Petrophysical and fluid information, such as porosity, pore size distribution, bulk water irreducible, permeability, capillary pressure curve, wettability index and fluids like water, gas, and oil saturation, and properties like viscosity at the reservoir can be extracted from downhole NMR measurements. Understanding the nature of NMR measurements of fluids in rock pores is critical for the proper application of NMR in formation evaluation and reservoir characterization. This chapter discusses the issues associated with NMR petrophysics, the models used for obtaining petrophysical and fluid properties from downhole NMR measurements, and the determination of the key parameters used in these models.