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Time series of hole 9 AE hits and pressure change data from 1795 s to 1828 s
15
15
Located AE event times
10
10
Scaled pressure
5
5
Scaled AE hit data
0
0
E1p
E2p
E3p
E4p
E5p
-5
E0p
-5
1795
1800
1805
1810
1815
1820
1825
Time (s)
(a)
Time series of hole 9 - corrected pressure change data from 1795 s to 1828 s
0.8
0.6
0.4
0.2
0
E1p
E2p
E3p
E4p
E5p
E0p
-0.2
1795
1800
1805
1810
1815
1820
1825
Time (s)
(b)
Time series of hole 9 voltage and AE hit data from 1795 s to 1828 s
15
10
5
0
-5
E1p
E2p
E3p
E4p
E0p
E5p
-10
1795
1800
1805
1810
1815
1820
1825
(c)
Time (s)
Figure 5.20 Fluid pressure, acoustic emissions, and electrical potential changes during a given time window. a) The acoustic emission
(AE) data and pressure change correlation. The red asterisks denote the located AE events. b) The trend removed pressure changes.
c) The voltage responses at all 32 measurement points. The events labeled E0p
E5p represent the same events in each panel of
the figure. The AE hits, the pressure changes, and the voltage data all align, indicating that there is a relationship between these
phenomena. ( See insert for color representation of the figure .)
-
as the fluid injection proceeds. The magnitude of the
electrical potential grows from Event E2 onward and
maintains the spatial voltage distribution/polarity
throughout the remainder of the data acquisition. This
implies that fluid ismoving upward in a persistentmanner,
somewhere in the vicinity of Hole 9 during and after
Event E2.
The Hole 9 fluid pressure change (sampled at 5 Hz)
response during constant flow injection (phase II) is
shown in Figure 5.20 along with the AE hit count versus
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