The paper presents a case study of a major carbonate reservoir under peripheral waterflood. It illustrates the importance of good surveillance data not only for monitoring performance but also for characterizing reservoirs. It shows that fluid flow in a lithologically complex and highly stratified reservoir can be much simpler than would be projected from geology alone. The paper also discusses a production strategy that has improved areal and vertical sweep.

In this study, the available surveillance data including well performance, geochemical analysis, cased and openhole logs were utilized to determine water encroachment patterns, areal and vertical sweep, and identify the reasons for lack of sweep in certain areas of the reservoir. The observed flood performance has been incorporated into an updated geological model of the reservoir that will form the basis for a forthcoming 3-D simulation model.

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