seismic attributes - tectonics
TRANSCRIPT
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6a-1
Seismic Attribute Mapping of Structure Seismic Attribute Mapping of Structure
and Stratigraphy and Stratigraphy
Attribute Expression of Tectonic DeformationAttribute Expression of Tectonic Deformation
Kurt J. Marfurt (University of Oklahoma)Kurt J. Marfurt (University of Oklahoma)
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6a-2
Course OutlineCourse Outline
IntroductionIntroduction
Complex Trace, Horizon, and Formation AttributesComplex Trace, Horizon, and Formation Attributes
Multiattribute DisplayMultiattribute Display
Spectral DecompositionSpectral Decomposition
Geometric AttributesGeometric Attributes
Attribute Expression of GeologyAttribute Expression of Geology
Impact of Acquisition and Processing on AttributesImpact of Acquisition and Processing on Attributes
Attributes Applied to OffsetAttributes Applied to Offset-- and Azimuthand Azimuth--Limited VolumesLimited Volumes
StructureStructure--Oriented Filtering and Image EnhancementOriented Filtering and Image Enhancement
Inversion for Acoustic and Elastic ImpedanceInversion for Acoustic and Elastic Impedance
Multiattribute Analysis ToolsMultiattribute Analysis Tools
Reservoir Characterization WorkflowsReservoir Characterization Workflows
3D Texture Analysis3D Texture Analysis
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6a-3
Attribute expression of tectonic deformationAttribute expression of tectonic deformation
After this section you should be able to:
• Use coherence to accelerate the interpretation of faults on 3-D volumes,
• Use volumetric attributes to provide a preliminary interpretation across multiple surveys having different amplitude and phase,
• Identify the appearance and structural style of salt and shale diapirs on geometric attributes,
• Use curvature to define axial planes, and
• Use coherence and curvature as an aid to predicting fractures.
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6a-4
N
E
S
W
EastWest
Gentle
South
Dip
Moderate
West dip
Gentle
North
dip
Northeast
dip
Moderate
Southeast
dip
Growth faults, Gulf of MexicoGrowth faults, Gulf of Mexico
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6a-5
N
E
S
W
Growth faults, Gulf of MexicoGrowth faults, Gulf of Mexico
00
66
44
22
Tim
e (
s)
Tim
e (
s)
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6a-6
Identification of faults (Gulf of Mexico, USA)Identification of faults (Gulf of Mexico, USA)
Salt
Salt
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6a-7
Identification of faults (Alberta, Canada)Identification of faults (Alberta, Canada)
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6a-8
4.0
2.0
3.0
1.0
1.0
2.0
3.0
0.0
Tim
e (
s)
5 k
m
4.0
2.0
3.0
1.0
1.0
2.0
3.0
0.0
Tim
e (
s)
5 k
mSeismicSeismic CoherenceCoherence
Identification of faults and stratigraphyIdentification of faults and stratigraphy(Gulf of Mexico, USA)(Gulf of Mexico, USA)
FaultsFaults
‘‘BandingBanding’’
‘‘StratigraphyStratigraphy’’
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6a-9
Attribute imaging of faults and flexuresAttribute imaging of faults and flexures
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6a-10
Fault not seen Fault not seen
on curvature.on curvature.
Seen on Seen on
coherence.coherence.
Fault seen on Fault seen on
curvature. curvature.
Seen on Seen on
coherence.coherence.
Idealized Idealized
growth growth
faultfault
Idealized Idealized
strikestrike--slip slip
faultfault
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6a-11
Fault seen on Fault seen on
coherence. coherence.
Not seen on Not seen on
curvature.curvature.
Fault seen on Fault seen on
curvature.curvature.
Not seen on Not seen on
coherence.coherence.
Fault with Fault with
minimal minimal
offsetoffset
Fault with Fault with
finite finite
offsetoffset
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6a-12
Fault seen on coherence Fault seen on coherence
at depth. Infill/collapse at depth. Infill/collapse
seen on curvature seen on curvature
shallow.shallow.
‘‘FaultFault’’ seen seen
on curvature.on curvature.
Not seen on Not seen on
coherence.coherence.
Folds and Folds and
flexuresflexuresInfilledInfilled
grabensgrabens
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6a-13
BasinwideBasinwide Regional Interpretation across Regional Interpretation across
Heterogeneous Seismic SurveysHeterogeneous Seismic Surveys
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6a-14
10 km
1.0
1.2
1.4
1.6
0.8
Time (s)
N
Time/structure map of heterogeneous surveysTime/structure map of heterogeneous surveys
Central Basin Central Basin
Platform, Platform,
Texas, USATexas, USA
Top DevonianTop Devonian
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6a-15
1.0
0.8
Coh
10 km
N
Coherence time slice on heterogeneous surveysCoherence time slice on heterogeneous surveys
Central Basin Central Basin
Platform, Platform,
Texas, USATexas, USA
t=1.0 st=1.0 s
(Data courtesy (Data courtesy
of BP, OXY, of BP, OXY,
Burlington)Burlington)
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6a-16 (Biles et al, 2003).
A large regional surveyA large regional survey
Eugene Island
Ship Shoal
VermillionSouth
VermillionSouth MarshIsland
TexasLouisiana
EastCameron
WestCameron
Gulf of Mexico
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6a-17 (Biles et al, 2003).
Use of coherence to interpreter a large regional surveyUse of coherence to interpreter a large regional survey
‘Coherence’ at 3.0 s
TexasLouisiana
Gulf of Mexico
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6a-18
Interpretation WorkflowsInterpretation Workflows
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6a-19
N
EW
S
low coh
mid coh
high coh
2 kmN
EW
S
N
EW
S
(Data courtesy of OXY)
Workflow#1: Using attribute to delineate limits Workflow#1: Using attribute to delineate limits
of fault of fault zoneszones
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6a-20
A A′′′′
B
B′′′′
C
N
5 km
Workflow#2: Using attribute time slices to help Workflow#2: Using attribute time slices to help
correlate horizons across faultscorrelate horizons across faults
Coherence time Coherence time
slice. T=2.7 sslice. T=2.7 s
(Green Canyon, (Green Canyon,
GOM, USA)GOM, USA)
SaltSaltPick an arbitrary Pick an arbitrary
line that runs line that runs
around faultsaround faults
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6a-21
C
B B′′′′2.0
2.5
3.0
Tim
e (
s)
A A′′′′4 km
C2.0
2.5
3.0
Tim
e (
s)
C
Seismic Seismic ‘‘traversetraverse’’
chosen to avoid chosen to avoid
major faultsmajor faults
(Data courtesy of BP)(Data courtesy of BP)
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6a-22
N
3 km
Workflow #3: Workflow #3:
Using Using
attributes to attributes to
help fault help fault
naming and naming and
correlationcorrelation
coherencecoherence seismicseismic
t=2.6 st=2.6 s t=2.6 st=2.6 s
Northwest Louisiana, Northwest Louisiana,
USAUSA
(Data courtesy of Seitel)(Data courtesy of Seitel)
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6a-23
N
3 km
N
3 km
1) Pick on coherence 1) Pick on coherence
using seismic time using seismic time
slice as a guide. Try slice as a guide. Try
to avoid to avoid
stratigraphic stratigraphic
discontinuities and discontinuities and
unconformitiesunconformities
coherencecoherence seismicseismic
t=2.6 st=2.6 s t=2.6 st=2.6 s
(Data courtesy of Seitel)(Data courtesy of Seitel)
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6a-24
coherencecoherence seismicseismic
2) Choose a seismic 2) Choose a seismic
line perpendicular to line perpendicular to
the fault traces. Pick the fault traces. Pick
and assign faults as and assign faults as
you normally would.you normally would.
A A′′′′
Top Cotton
Valley
Bott
om
Cott
on V
alley
A A′′′′
N
3 km
2.5
2.0
3.0
Tim
e (
s)
t=2.6 st=2.6 s
(Data courtesy of Seitel)(Data courtesy of Seitel)
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6a-25
coherencecoherence seismicseismic
3) Choose a 23) Choose a 2nd nd EW EW
seismic line further seismic line further
down the fault trace down the fault trace
to begin forming a to begin forming a
coarse fault grid.coarse fault grid.
B B′′′′
2.5
2.0
3.0
Tim
e (
s)
A A′′′′
B B′′′′
t=2.6 st=2.6 s
(Data courtesy of Seitel)(Data courtesy of Seitel)
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6a-26
coherencecoherence seismicseismic
4) Pick a NS line and 4) Pick a NS line and
continue the continue the
process. If subtle process. If subtle
discontinuities seen discontinuities seen
to be faults on to be faults on
seismic, track them seismic, track them
on coherence.on coherence.2.5
2.0
3.0
Tim
e (
s)
N
3 km
C
C′′′′
C C′′′′
t=2.6 st=2.6 s
(Data courtesy of Seitel)(Data courtesy of Seitel)
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6a-27
coherencecoherence seismicseismic
5) Pick additional NS 5) Pick additional NS
lines and continue lines and continue
the process, forming the process, forming
a coarse grid.a coarse grid.
D
D′′′′
D D′′′′
2.5
2.0
3.0
Tim
e (
s)
t=2.6 st=2.6 s
(Data courtesy of Seitel)(Data courtesy of Seitel)
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6a-28
6) Pick a new time 6) Pick a new time
slice through the slice through the
coherence volumecoherence volume
coherencecoherence coherencecoherence
t=2.5 st=2.5 s t=2.7 st=2.7 s
(Data courtesy of Seitel)(Data courtesy of Seitel)
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6a-29
coherencecoherence coherencecoherence
t=2.5 st=2.5 s t=2.7 st=2.7 s
7) Use the cross7) Use the cross--
posted fault picks posted fault picks
from the vertical from the vertical
seismic to guide seismic to guide
your interpretation your interpretation
on the seismic on the seismic
coherence slicescoherence slices
(Data courtesy of Seitel)(Data courtesy of Seitel)
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6a-30
Structural DeformationStructural Deformation
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6a-31
Offshore Trinidad Time Slice (t=1.2 s)Offshore Trinidad Time Slice (t=1.2 s)
N
2 km 2 km
Galeota Ridge
Seismic Coherence
Complex
faulting
difficult to
detect on
seismic
Coherence
shows
lateral
continuity
of faults
(Gersztenkorn et al., 1999)
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6a-32
Coherence Time Slice (1.1 s)
Dip / AzimuthTime Slice (1.1 s)
(Gersztenkorn et al., 1999)
NW
ESN
E
D
D′
E′
D
D′
E E′
2 km
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6a-33 (Gersztenkorn et al., 1999)
Seismic DataSeismic Data
E′E
Tim
e (
s)
1.5
1.1
0.7
D D′
Tim
e (
s)
1.3
1.1
0.9
2 km
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6a-34
P
P′′′′
Q
Q′′′′
R′′′′
R
P
P′′′′
Q
R′′′′
R
P
P’
Q
R’
R
Q′′′′ Q′′′′
neg
pos
Curv
0
1.0
0.8
Coh
Teapot Dome (WY, USA)Teapot Dome (WY, USA)
CoherenceCoherence Most Positive Most Positive
CurvatureCurvatureMost Negative Most Negative
CurvatureCurvature
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6a-35
Teapot Dome (WY, USA)Teapot Dome (WY, USA)T
ime
(s
)
1.5
0.5
1.0
P′′′′ R′′′′RP Q Q′′′′
(Data courtesy of RMTOC)(Data courtesy of RMTOC)
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6a-36
Reverse Faulting (Alberta, Canada) Reverse Faulting (Alberta, Canada)
A
A’
A A’
Neg Pos0
Low High
(Chopra and Marfurt, 2007b)
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6a-37
Line 1
Line 3
Line 4
Line 5
Line 6
Line 2
(Chopra and Marfurt, 2007b)
Coherence Strat SlicesCoherence Strat Slices
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6a-38
Line 1
Line 3
Line 4
Line 5
Line 6
Line 2
(Chopra and Marfurt, 2007b)
MostMost--Positive Curvature Strat SlicesPositive Curvature Strat Slices
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6a-39
Line 1
Line 3
Line 4
Line 5
Line 6
Line 2
(Chopra and Marfurt, 2007b)
MostMost--Negative Curvature Strat SlicesNegative Curvature Strat Slices
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6a-40
Neg Pos0
(Chopra and Marfurt, 2007b)
Line 1
1000 ms
1600 ms Line 3Line 2 Line 4
Line 5 Line 6
Faults that appear as
discontinuities (seen
on both coherence and curvature horizon
slices)
Flexures seen on most
positive curvature
horizon slice that do
not appear coherence
slice
1000 ms
1600 ms
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6a-41
Salt and Shale DiapirismSalt and Shale Diapirism
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6a-42
Vertical seismic section through the
La Rue salt dome, East Texas, USA
(Maione, 2001)
.
4350
11300
20900
Dep
th (ft)
1.0
2.0
3.0
La RueSalt
Dome
PECAN GAP CHALK
BUDA LIME
JAMES LIME
AUSTIN CHALK
JAMES LIME
COTTON
SALT WELD
LIMEVALLEY
LOUANN SALT
3 mi
Tim
e (
s)
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6a-43
Isochron contour map of the interval between theIsochron contour map of the interval between the
James and Buda LimestonesJames and Buda Limestones
(Maione, 2001).
SALT
WITHDRAWAL
BASIN
>1300 ms
~ 600 ms
8 km1.4 s
1.9 s
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6a-44 (Maione, 2001).
Ring faults difficult to see on seismic data, easier to see on Ring faults difficult to see on seismic data, easier to see on
coherencecoherence
Time slice through La Rue Salt Dome, East Texas, USATime slice through La Rue Salt Dome, East Texas, USA
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6a-45
8 km
La RueSalt
Dome
Salt Dome
Salt Dome
Time slice through coherence volumeTime slice through coherence volume
Time slice at 1.232 s
(Maione, 2001).
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6a-46
Time slice at 1.400 s
8 km
Time slice through coherence volumeTime slice through coherence volume
Salt Dome
Salt Dome
La RueSalt
Dome
(Maione, 2001).
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6a-47
8 km
Time slice at 1.636 s
La RueSalt
Dome
Salt Dome
Salt Dome
Time slice through coherence volumeTime slice through coherence volume
(Maione, 2001).
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6a-48
Coherence volume, looking South, showing concentric ring fault
patterns and stratigraphic thickening
(Maione, 2001).
La RueSalt
Dome
8 km
N
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6a-49
Vertical section between two salt withdrawal basins
Seismic Coherence
3 km
(Maione, 2001).
1.5
1.0
2.0
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6a-50
Mapping Folds and FlexuresMapping Folds and Flexures
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6a-51
Seismic amplitudeSeismic amplitude CoherenceCoherence
highhigh
00
highhigh
lowlow
5 km
Most positive curvatureMost positive curvature
highhigh
00
Central Basin Platform, Texas, USACentral Basin Platform, Texas, USA
Horizon slices along Horizon slices along
DevonianDevonian
(Blumentritt et al., 2006)
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6a-52
Pick lineaments seen on curvaturePick lineaments seen on curvature
Methodology
highhigh
00
(Blumentritt et al., 2006)
2 km
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6a-53
Interpretation of Interpretation of
LineamentsLineaments
Red and Blue
lines: Readily observable faults
Green lines: Subtle geologic
features
(Blumentritt et al., 2006)
Deformation
model
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Application
What is the geologic explanation of these What is the geologic explanation of these
lineaments?lineaments?
2 km
(Blumentritt et al., 2006)
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Buckling in Competent Rocks?Buckling in Competent Rocks?Application
(Blumentritt et al., 2006)
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Structural DeformationStructural Deformation
In Summary:In Summary:•• In general, time slices show better fault images (with less inteIn general, time slices show better fault images (with less interpreter bias) than rpreter bias) than
horizon slices.horizon slices.
•• Geometric attributes are relatively insensitive to the seismic Geometric attributes are relatively insensitive to the seismic source wavelet, source wavelet,
such that they are useful in visualizing geologic features that such that they are useful in visualizing geologic features that span surveys span surveys
subjected to different acquisition and processing.subjected to different acquisition and processing.
•• Geometric attributes allow us to quickly define and name a coarGeometric attributes allow us to quickly define and name a coarse fault se fault
network.network.
•• Volumetric curvature allows us to map subtle folds and flexuresVolumetric curvature allows us to map subtle folds and flexures associated associated
with tectonic deformation.with tectonic deformation.
•• Volumetric curvature also illuminates faults that are inaccuratVolumetric curvature also illuminates faults that are inaccurately imaged or ely imaged or
have small vertical throw.have small vertical throw.
•• Geometric attributes allow us to visualize plastic deformation Geometric attributes allow us to visualize plastic deformation in ductile shales in ductile shales
and brittle deformation in more competent carbonates and sandstoand brittle deformation in more competent carbonates and sandstones.nes.