estimating seismic attenuation (q) from vsp data at a heavy-oil field: ross lake, saskatchewan arnim...
TRANSCRIPT
![Page 1: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/1.jpg)
Estimating seismic attenuation (Q) Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: from VSP data at a heavy-oil field:
Ross Lake, SaskatchewanRoss Lake, Saskatchewan
Arnim B. Haase and Robert R. StewartArnim B. Haase and Robert R. Stewart
CREWES Project, University of CalgaryCREWES Project, University of Calgary
![Page 2: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/2.jpg)
OutlineOutline
IntroductionIntroduction Motivation, locationMotivation, location New Q-applicationsNew Q-applications Review of analytical signal method for Review of analytical signal method for
Q-estimation Q-estimation QQpp estimation from downgoing P-wave estimation from downgoing P-wave
isolated from offset VSPisolated from offset VSP QQss estimation from upgoing C-wave estimation from upgoing C-wave
isolated from offset VSPisolated from offset VSP ConclusionsConclusions
![Page 3: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/3.jpg)
(Calderón-Macías et al., 2004)
![Page 4: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/4.jpg)
Ross Lake Oilfield
![Page 5: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/5.jpg)
Ross Lake, Saskatchewan – View of field and well 11-25
![Page 6: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/6.jpg)
11-25 well site with VSP survey underway
![Page 7: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/7.jpg)
Separated Downgoing P-Wave Field (54m offset source – vertical vibrator)
Separated Downgoing S-WaveField (54m offset src. – horizontal vibrator)
![Page 8: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/8.jpg)
Previous Results
MethodSpectral
RatioDrift
CorrectionEmpirical Equation
Convolutional/WE Modeling
Average
QP 67 37 to 41 57 80/84 61
QS 23 37 11 24
![Page 9: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/9.jpg)
Complex trace analysis (Engelhard et al., 1986; Tonn, 1991)
( ) ( ) cos ( )u t a t t
0
( ) ( ) ( ) 2 ( ) i tz t u t iv t U e d
2 2( ) ( ) ( )a t u t v t
![Page 10: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/10.jpg)
Time derivative of complex trace (Engelhard et al., 1986)
0
'( ) 2 ( ) i tz t i U e d
![Page 11: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/11.jpg)
Instantaneous frequency (Engelhard et al., 1986)
' '( )( )
2
d t z z zzt
dt izz
![Page 12: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/12.jpg)
Log instantaneous amplitude ratio (Engelhard et al., 1986; Tonn, 1991)
( )2 2ln ln ( ) ( )1 2( ) 41 1
a t G tt t
a t G Q
![Page 13: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/13.jpg)
Separated Downgoing P-Wave Field (400m offset source – vertical vibrator)
![Page 14: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/14.jpg)
Instantaneous Amplitude of Separated Downgoing P-Wave Field
![Page 15: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/15.jpg)
Log Spreading Ratio versus Q for Downgoing P-Wave Field at 303m Depth
Current estimate: Qp=44
Previous range: 37 to 84
![Page 16: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/16.jpg)
Log Amplitude Ratio versus Δt for Downgoing P-Wave Field
![Page 17: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/17.jpg)
![Page 18: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/18.jpg)
Linear Fit of Log Amplitude Ratio versus Δt for Downgoing P-Wave Field
![Page 19: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/19.jpg)
Linear Fit of Log Amplitude Ratio versus Δt for Downgoing P-Wave Field
![Page 20: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/20.jpg)
Separated Upgoing C-Wave Field (400m offset source – vertical vibrator)
![Page 21: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/21.jpg)
Instantaneous Amplitude of Separated Upgoing C-Wave Field
![Page 22: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/22.jpg)
Log Spreading Ratio versus Q for Upgoing C-Wave Field at 933m Depth
Current estimate: Qs=28
Previous range: 11 to 37
![Page 23: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/23.jpg)
Log Amplitude Ratio versus Δt for Upgoing C-Wave Field
![Page 24: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/24.jpg)
![Page 25: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/25.jpg)
Linear Fit of Log Amplitude Ratio versus Δt for Upgoing C-Wave Field
![Page 26: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/26.jpg)
Linear Fit of Log Amplitude Ratio versus Δt for Upgoing C-Wave Field
![Page 27: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/27.jpg)
Q versus Depth Station
![Page 28: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/28.jpg)
(Calderón-Macías et al., 2004)
* *
···*···*
![Page 29: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/29.jpg)
ConclusionsConclusions
New Q estimates within range of previous New Q estimates within range of previous resultsresults
Log amplitude ratio versus Log amplitude ratio versus ΔΔt curves are t curves are almost straight for P-wavesalmost straight for P-waves
Log amplitude ratio versus Log amplitude ratio versus ΔΔt curves nt curves not as ot as smooth for C-waves but still useful for Qsmooth for C-waves but still useful for Qss
Results need to be verified by synthetic Results need to be verified by synthetic examples examples
Transmission effects should be Transmission effects should be investigatedinvestigated
![Page 30: Estimating seismic attenuation (Q) from VSP data at a heavy-oil field: Ross Lake, Saskatchewan Arnim B. Haase and Robert R. Stewart CREWES Project, University](https://reader036.vdocuments.net/reader036/viewer/2022062408/56649f255503460f94c3c3dc/html5/thumbnails/30.jpg)
Acknowledgements
Thank you to Husky Energy Inc., in particular Mr. Larry Mewhort, for release of the VSP-data. Support by the CREWES team and its industrial sponsorship is gratefully acknowledged.