For saturated reservoirs with no gas cap, graphing F versus Eo yields a slope equal to which quantity?

For saturated reservoirs with no gas cap, graphing F versus Eo yields a slope equal to which quantity?

• A. Np
• B. N, Original Oil In Place
• C. S
• D. 1

Answer: (B)

In a saturated reservoir with no gas cap, the oil is the only mobile phase and the total amount of oil that can ever be produced is governed by the amount of oil that was initially in place. When you plot cumulative oil production F against the initial oil in place Eo, the relationship is linear: as you account for more initial oil, the potential production scales directly with it. The slope of that straight line is the original oil in place, N, because N sets the total scale of what could be produced. This is why the slope corresponds to the OOIP, not to the cumulative production itself, a gas-related parameter, or a unit slope.

In a saturated reservoir with no gas cap, the oil is the only mobile phase and the total amount of oil that can ever be produced is governed by the amount of oil that was initially in place. When you plot cumulative oil production F against the initial oil in place Eo, the relationship is linear: as you account for more initial oil, the potential production scales directly with it. The slope of that straight line is the original oil in place, N, because N sets the total scale of what could be produced. This is why the slope corresponds to the OOIP, not to the cumulative production itself, a gas-related parameter, or a unit slope.