Transcript UM4_InterpretationStrategy

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Develop Interpretation
Strategy
Develop Interpretation
Strategy
Objectives
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Observe the challenges on the data (data quality, fault
complexity, event continuity, etc)
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Build strong interpretation framework
Develop Interpretation
Strategy
Workflow
1.
Scan through the data
2.
Start from well and decide what horizon need to interpret to
represent what reservoir
3.
Build strong interpretation framework through out areas within
good data quality and most continuous seismic events
4.
Generating seismic attribute cube and Seismic Enhancement if
necessary
5.
Interpret faults then the horizons
6.
Seismic attribute extraction
Scan Through The Data
(data courtesy
of KIDRA)
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Scan Through The Data
Scan Through The Data
Scan Through The Data
Start Interpretation From The Well
Interpreting on 2D Seismic data
Improving Seismic Quality
Original Data
After Envelope Scaling
3-6 Hz filter
Improving Seismic Quality
Capturing Important Geologic Features
Capturing Important Geologic Features
GAMBIR-1
PROSPECT
Will these also be
gas??
FLAT
SPOTS
Possible
Gas
Sand
Is it water or
oil?
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2 IL
:842
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9 IL
:879
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5 IL
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Improving Seismic Quality Through Multi-Attribute
AMPLITUDE+SEMBLANCE
AMPLITUDE
SWEETNESS+SEMBLANCE
SWEETNESS
Interpreting Fault
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How important
of identifying fault patterns
Difficulty to do fault
interpretation onInline
Easy to do fault /hor.
Interpret. on Random line
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Case1 of New Workflow
Boundary
Faults
In Line
Xline Random Line
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Fault
Planes
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Case1 of New Workflow
Boundary
Faults
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Complex
Faults area
Case2 of New Workflow
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FAULT DELINEATION WORK FLOW
EARLIER WORKFLOW
Seiswork
Even Similarity Prediction (ESP)
SeisCube
NEW WORKFLOW
Seiswork
Even Similarity Prediction (ESP)
PostStack
EarthCube AVI
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Workflow 2000
Advanced workflow
for complex fault
system
Create ESP Cube
Poststack ESP
Fault Interpretation
Seiscube
MAPPING
Conventional
Seismic Data
Horizon Interpretation
Along random line
SEISWORK
QC Random Line
Faults Edit
Book Marks Fun.
SeisWorks
Horizon Auto. Tracking
ZAP!
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New Fault Delineation Workflow
Workflow 2001
ESP processing
Remain faults only
Image Enhancment
AGC
Reduce unwanted “faults”
Fault Labeling Threshold64-127, min100,max5000000
EC
Cube Math
Make faults in max values
Add faults to original data
no
(Volume+128)*1000=Fmax1
CubeMath
Check if any F missing
Pick up missing faults
yes
Voxbody detect
Convert to .3dv
For interpret
(Fmax1+original volume)+Fmax1= Fmax2
Values in range16/32-127
Voxbody as mask
Convert to .3dv
Cube Math
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(read to share Mom), *1000=Fmax
STEP-1
Generate Event Similarity Prediction (ESP) Cube
What is PostStack ESP?
PostStack ESP (Event Similarity Prediction) processing provides
a set of mathematical tools to assess the similarity of seismic
data unbiased by any interpretation.
Equation:
K= N + w/2
S
GK - HK+d
K= N - w/2
Md =
K= N + w/2
S
GK + HK+d
K= N - w/2
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d is a dip shift term
STEP-1
Where ESP used?
Fault Delineations
Map View
Cross Section
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STEP-1
Where ESP used?
Stratigraphic Interpretation
Map View
Cross Section
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STEP-1
ESP Cube
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STEP-2
Perform ESP Image Enhancement (PostStack)
Before Image Enhancement
After Noise Image Enhancement
(FK Fan Filter and AGC)
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STEP-2
ESP Section before noise suppression
(in EarthCube)
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STEP-2
ESP map view (in EarthCube)
Much noise
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STEP-2
ESP Section highlighted using Max Opacity
(in EarthCube)
Much noise
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STEP-2
ESP Section after Image Enhancement
(in EarthCube)
Too much “faults”
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STEP-3
Faults Parameterization in EarthCube using
Automated Voxbody Labeling
•
•
•
•
Amplitudes, Takes the
opacity curve
Connectivity ,
Connects the cells
Body Size, connect cell
volume >XX voxels
Rank by Volume, use
opacity curve to select
bodies by volume
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STEP-3
Automated Fault-body Labeling
and generate Cube
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STEP-3
Before and After Fault Body Labeling
Before
After
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STEP-4
Cube Math in AVI
Faultbody label Cube 1 + Original Seismic Cube
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STEP-4
Original Seismic with fault segments
Some faults missing
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STEP-5
Highlight fault segments within low
amplitude range
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STEP-6
Perform Cube Math to add new fault label
cube to the original seismic data
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Final Seismic Cube with fault traces
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Seismic Section with fault traces
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Fault traces in horizon slice
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3D view of horizon with interpreted fault traces
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New Fault Delineation Workflow
Workflow 2001
ESP processing
Remain faults only
Image Enhancment
AGC
Reduce unwanted “faults”
Fault Labeling Threshold64-127, min100,max5000000
EC
Cube Math
Make faults in max values
Add faults to original data
no
(Volume+128)*1000=Fmax1
CubeMath
Check if any F missing
Pick up missing faults
yes
Voxbody detect
Convert to .3dv
For interpret
(Fmax1+original volume)+Fmax1= Fmax2
Values in range16/32-127
Voxbody as mask
Convert to .3dv
Cube Math
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(read to share Mom), *1000=Fmax
Structural Interpretation
Inclusive Polygon
Exclusive Polygon
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Correlation Mode
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Editing Zapped Horizons
with Polygon Mode
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Auto Polygon Generator
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Horizon Interpretation Workshop
Screen 1
Colt Data set
Line 62
Start time 500 ms
Color bar bluwhtrd
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Horizon Interpretation Workshop
Screen 2
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Interpreting a Horizon
Horizon Interpretation
Information Bar
Show Position
Information Bar
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Horizon Interpretation Mode
Selected but not Active Horizon
in defined color
Active Horizon
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Interpreting on Time Slices –
Auto Tracking Mode
Portion of horizon
already interpreted
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Zig Zag Display
Choose any one of these methods to
display the lines:
Button 3
Select from Map
ZigZag
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Zig Zag Display
Seismic View Seismic
Map
ZigZag
Select from
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Zig Zag Display
Midpoint Icon, then to Map View Button 3
ZigZag
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Intersection Circles
Seismic View Contents Icon
Intersection Circles
OK
Toggle ON Horizon
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ZigZag Display
Line 60
Trace 140
Line 90
Note the
Select from
Map icon
Tie Point
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Loop Display
Choose any one of these methods to display the
lines:
•Click Button 3, then select Select from Map
•In the Seismic View, select Seismic
Map
Loop
Loop
Select from
•Click the Midpoint icon, and then in Map View, click
Button 3, and select Loop
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Loop Display
Button 2
Button 1
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Loop Display
Note the
Select from
Map icon
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Arbitrary Line Display
Choose any one of these methods to
display the lines:
•Click Button 3, and select Select from
Map
Point to Point
•In Seismic View, select Seismic
Select from Map
Point to Point
•Click the Midpoint icon, and then in Map
View, click Button 3, and select Point to
Point
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Arbitrary Line Display
Use button 3 to open the
popup menu. Select
Begin Display
Button 1
Button 1
Button 1
Button 1
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Arbitrary Line Display
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Seismic Fold and Intersection
Displays
Seismic fold and intersection displays allow you to choose
a tie line to display at any point on the line currently
displaying
Folds display the intersection of the requested line and the
original line
Intersections display the entire tie line
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Seismic Fold and Intersection
Displays
Cursor location
at Button 1 click
Resulting Display
Fold from Seismic
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Note these instructions
Seismic Fold and Intersection
Displays
Intersection from
Seismic
Place cursor at the desired
intersection then press button 1.
Resulting Display
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Delta system
Interpreting
Stratigraphic
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Delta Fan
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Delta Fan
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