![Page 1: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/1.jpg)
Brad Artman
• undergraduate: Colorado School of Mines, Geophysical Engineer
• graduate: Stanford University, Ph.D. candidate
• work experience:
– Western Atlas Logging Services, Junior Engineer
– U.S. Geological Survey, Visiting Scientist
– Shell Deepwater Development Inc., Petrophysicist & Exploration Geophysicist
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passive seismic imaging at ValhallBrad Artman, Stanford Exploration Project – Advanced imaging team
Monday, September 27
![Page 3: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/3.jpg)
multiple modeling in the image-spaceBrad Artman, Stanford Exploration Project – Advanced Imaging Team
Ken Matson, Advanced Imaging Team
Monday, September 27
![Page 4: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/4.jpg)
passive seismic imaging at ValhallBrad Artman, Stanford Exploration Project – Advanced imaging team
Monday, September 27
![Page 5: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/5.jpg)
passive seismology
• not event location
• structural imaging
– reflection seismology: subsurface investigation from the time-delayed reflections of sound off of geologic variations.
– passive imaging: with no application of controlled experimental sources, a relationship between a recorded transmission wavefield and reflection wavefields is required.
• requires: stationary seismometers, lots of disk space
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crustal scale exploration
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earthquake energy
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capitalizing on ambient noise
• earthquake arrivals
• ocean waves
• wind vibrations coupled with foundations
• cultural activity
– vehicle and boat traffic
– drilling noise
– nearby seismic acquisition
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Valhall
VALHALL
STAVANGER
0 100 km
UNITEDKINGDOM
NOR WAY
GERMANY
DENMARK
UNITEDKINGDOM
GERMANY
DENMARK
NORWAY
0 100 km
HOD
• one of the North sea giant fields
• partners Amerada Hess, Shell and Total
• reservoir highly porous chalk
• first production 1982
• field life 2028
• field production 90,000 bpd/day
• expected ultimate recovery 1,050 mm stb oil
• produced to date (01.01.2003) 500 mm stb oil • remaining reserves 540 mm stb oil
• high activity level – new wells & well work
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Valhall Life of Field Seismic (LoFS)
• Permanent field wide seismic array installed at Valhall during 2003
– 120 km seismic cables
– 2414 groups of 4C sensors
– Covers 45sq km
– 3 seismic surveys acquired, 4th to be acquired mid-September
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operations
• state of the art airgun array carried by stand-by boat – 53,000 shots per survey
• ~1/2 cost of LoFS installations related to the source
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• passive seismology by correlation
• why image?
– linearity of wavefield extrapolation
• application to Valhall LoFS
• why try passive seismic imaging?
• future plans
![Page 13: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/13.jpg)
transmission wavefield
time (s)
dep
th (m
)
position(m) position(m)
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ambient noise
r1 r2
t
r1 r2
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ambient noise
r1 r2
t
r1 r2
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ambient noise
r1 r2
t
r1 r2
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ambient noise
r1 r2
t
r1 r1 r1 r2
lag
r1 r2
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ambient noise
r1 r2
t
r1 r1 r1 r2
twt
r1 r2
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0 1200600 position(m)
20 2
5 3
0tim
e(s)
5 1
0
0 200100
lag
(s)0
0.1
0.3
400300offset(m)
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0 1200600 position(m)
20 2
5 3
0tim
e(s)
5 1
0
0-100 200100
lag
(s)0
0.1
0.3
offset(m)300
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0 1200600 position(m)
20 2
5 3
0tim
e(s)
5 1
0
0-100-200
200100
lag
(s)0
0.1
0.3
offset(m)
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0 1200600 position(m)
20 2
5 3
0tim
e(s)
5 1
0
0-100-200
100
lag
(s)0
0.1
0.3
offset(m)-
300
n long traces n short traces2
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• passive seismology by correlation
• why image?
– linearity of wavefield extrapolation
• application to Valhall LoFS
• why try passive seismic imaging?
• future plans
![Page 24: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/24.jpg)
why image?signal/noise enhancement
one correlated shot gather migrated image
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flow model
T= Transmission wavefieldD= Source wavefield (down-going)U= Receiver wavefield (up-going)R= Total reflection data
Rz+1
Tz TzRz
+
Uz Dz
Uz+1 Dz+1
+ -
Tz+1 Tz+1
+ -
correlation extrapolation
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SR Migration
flow model
T= Transmission wavefieldD= Source wavefield (down-going)U= Receiver wavefield (up-going)R= Total reflection data
Rz+1
Tz TzRz
+
Uz Dz
Uz+1 Dz+1
+ -
Tz+1 Tz+1
+ -
correlation extrapolation
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CMP Migration
flow model
T= Transmission wavefieldD= Source wavefield (down-going)U= Receiver wavefield (up-going)R= Total reflection data
Rz+1
Tz TzRz
+
Uz Dz
Uz+1 Dz+1
+ -
Tz+1 Tz+1
+ -
correlation extrapolation
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Passive Migration
flow model
T= Transmission wavefieldD= Source wavefield (down-going)U= Receiver wavefield (up-going)R= Total reflection data
Rz+1
Tz TzRz
+
Uz Dz
Uz+1 Dz+1
+ -
Tz+1 Tz+1
+ -
correlation extrapolation
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imaging advantages• poor data quality mandates imaging
• transformation from transmission to reflection wavefield can be accomplished along the way
• saves time
– n instead of n2 traces
– removes IFFT of n2 (long) traces
– trace length difference ~cancels strict compute cost savings
– file i/o provides big savings
• 1 shot of n traces vs. n shots of n traces
• multiple image-space summations
![Page 30: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/30.jpg)
synthetic proof of concept
reflection gather active migration
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synthetic proof of concept
correlated passive gather passive migration
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• passive seismology by correlation
• why image?
– linearity of wavefield extrapolation
• application to Valhall LoFS
• why try passive seismic imaging?
• future plans
![Page 33: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/33.jpg)
Valhall data
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Valhall data
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Valhall data
trace #
Depth slice near 88m
energy localized around rig
moveout across traces suggests surface noise
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Valhall data
Reflector?
mono-freq. boat noise
rig activity
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Valhall pipe cut normalization
4km
12km
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Valhall pipe cut image
4km
12km
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Valhall pipe cut image
4km
12km
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Valhall active seismic
4km
12km
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• passive seismology by correlation
• why image?
– linearity of wavefield extrapolation
• application to Valhall LoFS
• why try passive seismic imaging?
• future plans
![Page 42: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/42.jpg)
why try passive seismic imaging
• understand a completely undeveloped experiment
• capitalize on:
– existing hardware
– competitor’s sources
– teleseismic & local noise
• extend imaging bandwidth to lower frequencies
• imaging forward scattered modes
![Page 43: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/43.jpg)
• passive seismology by correlation
• why image?
– linearity of wavefield extrapolation
• application to Valhall LoFS
• why try passive seismic imaging?
• future plans
![Page 44: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/44.jpg)
future plans
• continued exploration of existing data
– multi-component experiments
– appropriate bandwidth parameterization
– time/energy requirements
– earthquake sources
• rig-site continuous correlation
• BP’s passive seismic imaging capabilities
– file-handling infrastructure
– native 3D imaging algorithms
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Oyo-Geospace cable
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multiple modeling in the image-spaceBrad Artman, Stanford Exploration Project – Advanced Imaging Team
Ken Matson, Advanced Imaging Team
Monday, September 27
![Page 47: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/47.jpg)
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• Surface Related Multiple Elimination (SRME)
– mechanics
– classic shortfall
– addressing the problem through imaging
• shot-record imaging
• multiple modeling at Maddog
• implications and status
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*
=
=
* =
*
Surface Related Multiple Extraction
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r
s
SRME
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r
s
?
SRME
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r
s
SRME
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r
s
?
SRME
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r
s
SRME
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r
s ?
SRME
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r
s
SRME
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E
N
*
SRME
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E
N
*
SRME
![Page 59: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/59.jpg)
•Exact kinematic modeling•Linearly increasing amplitude error w/ order of multiples•Suffers when FULL acquisition not supplied
•co-located sources and receivers
… in the image space
•Exact kinematic modeling- independent of velocity•Same amplitude problems (requires adaptive subtraction)•Wavefront healingWavefront healing
SRME
![Page 60: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/60.jpg)
z
x
wavefront healing
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z
x
wavefront healing
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z
x
wavefront healing
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• Surface Related Multiple Extraction (SRME)
– mechanics
– classic shortfall
– addressing the problem through imaging
• shot-record imaging
• multiple modeling Maddog
• implications and status
![Page 64: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/64.jpg)
flow model
T= Transmission wavefieldD= Source wavefield (down-going)U= Receiver wavefield (up-going)R= Total reflection data
Rz+1
Tz TzRz
+
Uz Dz
Uz+1 Dz+1
+ -
Tz+1 Tz+1
+ -
correlation extrapolation
![Page 65: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/65.jpg)
flow model
M= Multiple modelU = Receiver wavefield (up-going)
Mz
Mo
+
Uo Uo
Uz Uz
+ -
convolution extrapolation
*
*
![Page 66: Brad Artman undergraduate: Colorado School of Mines, Geophysical Engineer graduate: Stanford University, Ph.D. candidate work experience: –Western Atlas](https://reader035.vdocuments.mx/reader035/viewer/2022070400/56649f145503460f94c2842e/html5/thumbnails/66.jpg)
shot-record migration
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image-space multiple model
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• Surface Related Multiple Extraction (SRME)
– mechanics
– classic shortfall
– addressing the problem through imaging
• shot-record imaging
• multiple modeling Maddog
• implications and status
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shot-record migration
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image-space multiple model
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migration
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migration after subtraction
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subtraction after migration
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migration after subtraction
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migration
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• Surface Related Multiple Extraction (SRME)
– mechanics
– classic shortfall
– addressing the problem through imaging
• shot-record imaging
• multiple modeling Maddog
• implications and status
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image space multiple modeling
• exact kinematics
– inexact dynamics requires adaptive subtraction
– 1-2 less dimensions makes subtraction less expensive
• velocity independent
• incremental expense (1.5x) to produce during shot-record migration
– direct extension to Common Image Gathers
– split-spread input data required
• less expensive than regularization + SRME + migration
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status
• documented 2- and 3-D programs running
• suite of 2-D synthetic tests
• single shot 3-D synthetic test
– comprehensive testing will require significant resources
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acknowledgements
Sverre Brandsberg-Dahl, Joe Dellinger, Valhall BU
Richard Clarke, John Etgen, Advanced Imaging Team
Phuong Vu, David Lewis, Keith Gray, Jerry Ehlers, Randy Selzer
Ken Matson, Gerchard Pfau
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migrated conventional multiples
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migrated image
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image-space multiple model
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migrated conventional multiples
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migrated image