For many stratified limestone reservoirs, waterflooding through strategically placed injectors is a sound strategy for both pressure maintenance and increasing hydrocarbon recovery. Complications like heterogeneity, preferential depletion of layers and non-availability of suitable injector slots make this task difficult, and often leads to early and unexpected injection water breakthrough in some producers.
This paper basically deals with a part of the Bombay High field, with characteristics similar to the one described above. Production log interpretation was carried out on all the relevant injection and production wells in this area, and an attempt was made to understand the complex nature of the flood front movement at different points of time for individual layers. From the available log and core data on porosity and permeability in these distinct layers, a study was conducted to see if any cross-correlation can be made between the flood front movement and the reservoir parameters. Finally, the paper comments on whether such log and core deduced permeability data, which account for only a tiny fraction of the reservoir volume, is sufficient to predict water movement in other areas of the reservoir, based on data from surface testings and production logs.
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