Three Lower Cretaceous reservoirs in the southwestern Barents Sea have been studied and compared in terms of facies and depositional setting, diagenetic processes and reservoir properties in order to improve the current paleogeographic framework and to understand how depositional environments may control the reservoir quality. The methods include core and well log description, petrographic analysis, and seismic data as a reference. Petrographic observations show textural and diagenetic differences that have resulted in high porosity (up to 30 %) in two of the reservoirs, whereas one reservoir has <5 % porosity in some sandstone samples. The diagenetic differences can partly be explained by the presence of chlorite cement, observed in the high porosity reservoirs, which probably has inhibited some compaction and cementation and thereby preserved the porosity. Both texture and diagenesis, and thus the reservoir quality, largely reflects the depositional environment in which the rock formed. Early chlorite cement is for example commonly present in deltaic sandstone. The results from this study can be used on a larger perspective for a better understanding on the connection between sedimentary processes and reservoir properties.


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