Geoscience Reference
In-Depth Information
Table 4.2 Material properties used in the saturation front
detection. We use Model A described in Chapter 3 with n =2.
source function, we choose a Gaussian temporal function
that starts with a 30 ms delay with a dominant frequency
of 160 Hz. At the four external boundaries of the domain,
we constructed a 20 m thick C-PML using the approach
described previously. The sensors located at Well B are
30 m away from the right-side C-PML, and therefore,
the solution is not influenced by the PML boundary con-
dition. The receiver arrangement mimics the acquisition
that would be obtained with triaxial geophones and
dipole antennas. The C-PML boundary condition consists
of a strip with a finite distance (or width, or thickness, or
volume) that simulates the propagation of seismic waves
out to an infinite distance without any reflections going
back inside the domain of interest. PMLs are absorbing
Parameter
Value
Units
ρ s
2650
kg m 3
kg m 3
ρ w
1000
kg m 3
ρ o
900
K s
36.5
GPa
K fr
18.2
GPa
G
13.8
GPa
K w
2.25
GPa
K o
1.50
GPa
η w
1×10 3
Pa s
50 × 10 3
η o
Pa s
30
70
110
150
0.75
190
0.65
0
50
100
150
200
0
50
100
150
200
0
50
100
150
200
Distance (m)
Distance (m)
Distance (m)
0.55
(a)
(b)
(c)
0.45
30
0.35
70
110
150
190
0
50
100
150
200
0
50
100
150
200
0
50
100
150
200
Distance (m)
Distance (m)
Distance (m)
(d)
(e)
(f)
Figure 4.4 Six snapshots showing the evolution of the water saturation s w over time in a 150-m-thick NAPL contaminated aquifer.
The initial water saturation in the aquifer is equal to the irreducible water saturation s r = 0.25 (which correspond to a NAPL
saturation of 0.75). In this study the NAPL is considered to be the non-wetting phase. a) Reference snapshot T1. b) Snapshot T2
at 200 days. c) Snapshot T3 at 400 days. d) Snapshot T4 at 600 days. e) Snapshot T5 at 800 days. f) Snapshot T6 at 1000 days.
( See insert for color representation of the figure .)
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