A formation volume factor of 1.4 is characteristic of high-shrinkage oil and 1.2 of low-shrinkage oil. The ratio of stock tank volume to oil volume under reservoir conditions is called the formation volume factor (FVF). Oil reserves are calculated in terms of stock tank oil volumes rather than reservoir oil volumes. Stabilized oil under surface conditions (either 60 F and 14.7 psi or 15 C and 101.325 kPa) is called stock tank oil. As the gas bubbles out of the oil, the volume of the oil decreases. When oil is produced, the high reservoir temperature and pressure decreases to surface conditions and gas bubbles out of the oil. A 1 cubic metre container would hold 6.289808 barrels of oil. If the metric system is being used, a conversion factor of 6.289808 can be used to convert cubic metres to stock tank barrels. An acre of reservoir 1 foot thick would contain 7758 barrels of oil in the limiting case of 100% porosity, zero water saturation and no oil shrinkage. The constant value 7758 converts acre-feet to stock tank barrels. Gas saturation \(S_g \) is traditionally omitted from this equation. \[N = \frac\ \) = Formation volume factor (dimensionless factor for the change in volume between reservoir and standard conditions at surface) The Response Options Calculator (ROC) can be used to assess system performance of oil spill response methods, including mechanical recovery, dispersant application, and the in situ burning of oil. amount of shrinkage that the oil undergoes when brought to the Earth's surface.percentage water content of that porosity.
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