Phase Behavior and ThermodynamicsPVT Properties
Al-Marhoun Saturated Oil Formation Volume Factor Formula
Al-Marhoun Saturated Oil Formation Volume Factor calculates saturated oil formation volume factor for pvt properties workflows in phase behavior and thermodynamics.
How engineers use this formula
Use this formula when the listed inputs (R_s, gamma_g, gamma_o, T) are known and the assumptions behind the cited pvt properties relationship match the engineering case being checked.
Assumptions
- Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
- The declared units match the field-unit constants used in the formula.
- The cited formula applies to the selected petroleum engineering workflow.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, B_ob equals 1.341836 RB/STB.
R_sSCF/STB
600
gamma_gfraction
0.8
gamma_ofraction
0.85
T°F
180
Inputs
R_s
SCF/STBSolution Gas-Oil Ratio
gamma_g
fractionGas Specific Gravity
gamma_o
fractionStock-Tank Oil Specific Gravity
T
°FReservoir Temperature
Outputs
B_ob
RB/STB
Saturated Oil Formation Volume Factor
F_al_marhoun
dimensionless
Al-Marhoun Formation Volume Factor Correlating Parameter
Source and review
reviewedAl-Marhoun, M.A. 1988. PVT Correlations for Middle East Crude Oils, Journal of Petroleum Technology, SPE-13718-PA.
Source