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What is a 'Sweet spot' in an oil reservoir?

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Reservoirs are not homogeneous. The rock and even fluid properties varies within the same pool/compartment, sometimes even locally (anisotropic, such as permeability). read more

The sweet spots are the areas of the reservoir with highest oil saturation and permeability (among other properties) that yields - according to the assumptions, estimates and simulations made - the highest productivity indexes (ratios of well rate to the pressure drawdown) therefore the highest recovery factor. read more

Sweet spots in shale reservoirs may be defined by source-rock richness or thickness, by natural fractures, or by other factors, using geological data such as core analysis, well log data, or seismic data. read more

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Schlumberger Oilfield Glossary
www.glossary.oilfield.slb.com