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Microbial-enhanced oil recovery (MEOR) has been considered as a promising technique to further increase oil recovery from petroleum reservoirs. Although the potential benefits of MEOR applications are considerable, engineering of oil recovery via the manipulation of microbial metabolism still remains an unproven concept rather than a highly desirable reality. One of the main reasons is that there are few tools appropriate to quantify the multiple metabolic and physical processes involved in the oil recovery. This study seeks to address the lack of tools by presenting a computational model for simulating coupled processes in MEOR systems with two mobile, immiscible fluids. The primary goal of MEOR is to reduce the residual oil saturation. The residual saturation changes as a function of the capillary number that defines the relative effect of viscous forces versus surface tension acting across an interface …