Geology Reference
In-Depth Information
100
100
150
150
200
200
250
250
300
300
LS - 2 ms RC
ML - Parametric
4.0
0.0
4.0
0.0
2.0
2.0
-20.0
-20.0
0.0
0.0
-40.0
-40.0
-0.2
-0.2
-80.0
-80.0
-40
0
40
80
0
40
80
120
-40
0
40
80
0
40
80
120
TWT (ms)
Hz
TWT (ms)
Hz
Figure 9.15
Sensitivity of inversion to wavelet shape; the two inversion results were generated using identical parameters except that
wavelets were derived using different extraction methods (after Ozdemir et al.,
1992
).
Amplitude
Impedance (m/s.g/cc)
a)
b)
d)
-0.4
1850
-0.2
0
0.2
0.4
0
5000
10000
15000
1910
-0.08
-0.06
1870
-0.04
1920
-0.02
1890
0
1930
-0.02
1910
-0.04
1940
-0.06
1930
-0.08
-1
1950
-0.5
0
0.5
1
1.5
Amplitude
1950
c)
1960
-0.08
1970
-0.06
1970
-0.04
1990
-0.02
1980
0
2010
-0.02
1990
-0.04
2030
-0.06
-0.08
-1
2000
2050
-0.5
0
0.5
1
1.5
Amplitude
Figure 9.16
An effect of error in wavelet phase on an inversion result; (a) composite seismic response, (b) zero phase wavelet, (c) +45° degree
wavelet, (d) red curve assumes the wavelet in (b), blue curve assumes the wavelet in (c). The impedance of the upper layer is kept constant
between the two solutions.
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