A review of several nuclear magnetic resonance (NMR) based techniques published in the literature to extract wettability information that have the potential to be applicable in downhole formation. The techniques include T2 shift, T2 vs saturation, NMR T1 dispersion, T1/T2 ratio, and restricted diffusion. The theoretical basis and the advantages and disadvantages of each have implications for downhole applications. Due to the flexibility of NMR, adjusting the experiment for the specific application is very common, and this shows the strength and flexibility of NMR. Numerous references provide detailed readings for each discussed technique.

Keywords:
Upstream Oil & Gas, Downhole application, relaxivity, wettability information, valori, log analysis, information, NMR, determination, limitation
Subjects:
Formation Evaluation & Management, Open hole/cased hole log analysis
Copyright 2018, Society of Petroleum Engineers
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