Extensive laboratory research and field trials have been performed to evaluate the potential of microbial enhanced oil (MEOR) in mature fields. In this article, the authors try to study the potential of injecting nutrient in a mature field in Norwegian Continental Shelf (NCS) to improve the oil recovery by stimulating the growth of indigenous bacteria. The technology of the focus does not require live microorganisms to be injected; instead it depends on the microbes in the reservoirs. Therefore; the nutrient formulation is a key parameter. Several mechanisms have been proposed in the literature attributed to the enhancement of oil recovery by microbial interaction. In this study, we focus on the MEOR mechanisms of interfacial tension reduction and wettability modification (via bio-surfactant), and selective plugging (via bio-film). The study summarizes the changes in petrophysical parameters, i.e. interfacial tension (IFT), wettability, and permeability reduction, in the growing bacteria system through experimental work. The potential of MEOR is simulated in the full field model. The field is a mature field, which is producing at about 95% water cut. The main drainage strategy of the field is water flooding; there implementing MEOR does not need major modifications. The simulation shows that the nutrient injection can achieve 1-5% incremental oil recovery. Also, water cut is reduced by about 1% due to permeability reduction in the high permeable zones. The results can be used to predict and monitor the application of the MEOR technology during the field trial.