Tuesday, April 18, 2017

Highlights: Quality Deep-Water Sand

Porten and others show how reservoir quality of deep-marine sandstones is controlled by sediment composition, transport, and depositional histories in a range of sediment-gravity-flow deposits in a Maastrichtian submarine-fan in the Vøring Basin (Norwegian Sea, Norwegian continental shelf). In these strata, porosity increases with decreasing clay content, and permeability increases with increasing grain size, decreasing clay volume, and increasing porosity. Porosities of the different depositional bed types are similar, whereas permeabilities are distinct, with high-density turbidites having permeabilities approximately two orders of magnitude higher than clay-rich hybrid event beds. The results of this study emphasize the importance of the transport and depositional processes responsible for producing different bed types with characteristic composition and texture. This step is essential in reservoir evaluation, necessary for predicting most likely porosity and permeability evolution with sediment burial and for understanding reservoir quality distribution in potential deep-marine siliciclastic hydrocarbon reservoir targets.

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