Page 54 - Formulas and Calculations for Petroleum Engineering

Reservoir engineering formulas and calculations Chapter 1 47

Output(s)

PV: Pore Volume (dimensionless)

Formula(s)

z
28:27 T m g,avg avg q i
PV ¼ 2 2
m c P P wf D i
i
ti
gi
Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3,
Page: 252.

1.108 Porosity determination—IES and FDC logs
Input(s)

3
r b : Bulk Density (g/cm )
3
r ma : Matrix Density (g/cm )
3
r f : Average Fluid Density in Pore Spaces (g/cm )
Output(s)
Ø: Porosity (fraction)

Formula(s)

r ma r b
Ø ¼
r ma r f
Reference: Bassiouni, Z., 1994, Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4.
Chapter 11, Page: 210.

1.109 Produced gas-oil ratio
Input(s)

N p : Cumulative Oil Production (STB)
G p : Cumulative Gas Production (SCF)

Output(s)
R p : Net Cumulative Produced Gas-Oil Ratio (SCF/STB)

Formula(s)

G p
R ¼
p
N
p
Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 4,
Page: 302.