Karsts are features shaped by the dissolution of a layer or layers of soluble rocks, a process known as karstification which occurs in carbonate rocks during sub-aerial exposure when the relative sea-level is at the lowstand. Karsts features vary in sizes which can range from fracture to cavernous size. The Karsts pose challenges especially to exploration and appraisal drilling where severe mud loses have been observed and such incidents were evident in the field under study in this work. Yet, the influence of the Karsts towards reservoir behaviors is hitherto uncertain during the production stages. The Karsts could be the felon behind production wells cutting water earlier then expected as it can act as high permeability conduit that encourage fast water influx into the<br>reservoir. This was observed by the unexpected water breakthrough of one of the producing wells after just two years of production. Karsts acting as water conduits are not uncommon, as “fracture-karst water is an important water resource for water supply in North China” (ZHU Xueyu et al) and “the flow velocity of fracture-karst water is much faster than the velocity of porous water on an average.” (ZHU Xueyu et al). Furthermore, the Karsts may contribute to the increase of volumetric of the field by virtue of their pore volumes. Driven by concerns of reservoir performance due to Karsts impact, the challenge is to incorporate Karsts features in the current static model for this field in order to obtain a more accurate representation of the reservoir for later stage dynamic simulation.


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