Page 131 - Introduction to Petroleum Engineering

ACTIVITIES 117
and D is the current number of atoms of a daughter product. Use the age
equation to fill in the following table for U‐238 half‐life of 4.5 billion years.

D/P Age t (billion years)
0.10
0.25
0.50
0.75
1.00
1.50
2.00

6.5 The European and North American plates separate at the rate of 1 in. per year
in the vicinity of Iceland. How far apart would the two plates move in
10 000 years? Express your answer in feet.
6.6 Is the height of a transition zone greater for a reservoir with small pore throats
than large pore throats?
6.7 Assume a formation is approximately 3 mi wide, 10 mi long, and 30 ft thick.
The porosity of the sand averages almost 40%. Considering this surface sand
body as a model of an underground reservoir, determine the volume of pore
space in bbl. Assume net‐to‐gross ratio = 1.
6.8 An oil reservoir has average porosity = 0.23 in an area of 3200 acres with a
net thickness of 80 ft, an initial oil saturation of 70%, and an initial oil
formation volume factor of 1.4 RB/STB. Use the volumetric OIP equation to
estimate OOIP.

6.9 A. A reservoir is 3 mi wide and 5 mi long. What is the area of the reservoir in
acres?
B. The reservoir has a net thickness of 50 ft and 10% porosity. The initial gas
saturation is 70% with a gas formation volume factor of 0.005 RB/SCF.
What is the gas in place in SCF?