A new version of the Nuclear Magnetism Logging tool (NML) has been developed and will be available for limited commercial use in the near future. The tool measures the earth's field proton free induction decay of formation fluids. Since this tool operates exclusively with the CSU well-site computer system, it is capable of real-time computation and presentation of the free fluid index (FFI) and the spin-lattice relaxation time (T1). Other new features include a centralized coil sonde and improved electronics for higher signal-to-noise ratio and greater reliability. Engineering prototypes have been extensively field tested and have proven to be dependable in a logging environment. Logs correlate well with other porosity measurements from core data and sonic, nuclear, and electromagnetic propagation well logging tools. Data from NML logs can be applied to the determination of irreducible water saturation, porosity in unusual lithologies, residual oil saturation, and porosity in unusual lithologies, residual oil saturation, and to the estimation of permeability.

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