Page 220 - Petrophysics 2E

PROBLEMS 193

PROBLEMS

1. Calculate the porosity of the sample described below:

Dry sample mass 104.1 g
Mass of the water-saturated sample 120.2 g
Density of water 1.001 g/cm3
Mass of saturated sample immersed in water 64.7 g

a. Is this the effective or the total porosity of the sample?
b. What is most probably the lithology of the sample? Explain why.

2. A core 2.54 cm in length and 2.54 cm in diameter has a porosity of
22%. It is saturated with oil and water. The oil content is 1.5~m~~.
What is the pore volume of the core? What are the oil and water
saturations inside the core?
3. If a formation is 2.5 m thick, what is the volume of oil-in-place in
100 acres, if the core described in Problem 2 above is representative
of the reservoir. Report the volume in cubic meters and barrels.
4. Assume that the permeability and porosity data in Table 3A
are representative of several thousand data points taken for
permeability-porosity measurements of a reservoir.

a. Plot the data and develop an equation that represents the
relationship between permeability and porosity. Show the limits
of the applicability of this equation.

TABLE 3A

0.022 0.088
0.061 0.100
0.115 0.11
0.438 0.118
1.050 0.121
1.120 0.130
2.202 0.140
2.500 0.150
2.900 0.159