Wettability is a crucial factor for the dynamic properties of oil reservoirs. Early recognition of the wettability condition of a recovery may have a significant impact on the development options and of the expected recovery factor. NMR relaxation times of pore fluids are dependent on the wetting through surface relaxation, and are thus known to contain this valuable information. This paper describes an easy-to-implement and reliable procedure to calculate a quantitative wettability index from standard NMR measurements, such as can be made in conjunction with SCAL experiments. The interpretation is fully auditable, and therefore suitable to be part of a standard protocol.

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