Environmental Engineering Reference
In-Depth Information
Section 9
Review
9.1. Reading self-test
1. What is the typical grain size of shale?
a. > 2 mm
b. 0.06-2 mm
c. 0.008-0.06 mm
d. < 0.008 mm
2. What is a typical ratio of the porosity of sandstone and shale?
a. 10
b. 2
c. 0.5
d. 1
3. What are the typical temperature gradients found in geological
formations?
a. Between 5
°
C and 20
°
C per km
b. Between 10
°
C and 25
°
C per km
c. Between 15
°
C and 30
°
C per km
d. Between 25
°
C and 35
°
C per km
4. What is a typical ratio of the breakthrough pressure of CH 4 and
CO 2 for caprock?
a. 0.05
b. 0.5
c. 2
d. 20
5. Which statement about capillary hysteresis is not correct?
a. Capillary hysteresis cannot occur in formations in which the
rocks are CO 2 wetting
b. The mobility of the minority phase drops to zero if the major-
ity phase is continuous
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