In-situ reservoir description has recently taken a major step forward with the introduction of combinable Nuclear Magnetic Resonance (NMR) sensors. Run as a pad or mandrel device in combination with other logging tools, they can provide direct information on the properties of the pore structure and pore fluid. Much of this potentially valuable information has only been previously available from core data and formation fluid samples.

The paper will briefly review the principle of NMR measurement, then concentrate on some of the ever widening range of applications. Examples of these are taken from in and around the North Sea, and cover the following areas of reservoir evaluation.

Keywords:
permeability, porosity, relaxation, fluid viscosity, reservoir, information, spe 38551, jim white spe 38551, surface relaxation, well logging
Subjects:
Drilling Fluids and Materials, Reservoir Characterization, Reservoir Fluid Dynamics, Improved and Enhanced Recovery, Formation Evaluation & Management, Drilling fluid selection and formulation (chemistry, properties), Flow in porous media, Open hole/cased hole log analysis
Copyright 1997, Society of Petroleum Engineers
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