Develop Interpretation Develop Interpretation StrategyStrategy44

ObjectivesObjectives

Develop Interpretation StrategyDevelop Interpretation Strategy

- Observe the challenges on the data (data quality, fault complexity, event continuity, etc)

- Build strong interpretation framework

WorkflowWorkflow

Develop Interpretation StrategyDevelop Interpretation Strategy

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 DataScan Through The Data

55

(data courtesy of KIDRA)

Scan Through The DataScan Through The Data

Scan Through The DataScan Through The Data

Scan Through The DataScan Through The Data

Start Interpretation From The WellStart Interpretation From The Well

Line

90SW-23

Interpreting on 2D Seismic dataInterpreting on 2D Seismic data

Improving Seismic QualityImproving Seismic Quality

Original Data

3-6 Hz filter

After Envelope Scaling

Improving Seismic QualityImproving Seismic Quality

Capturing Important Geologic FeaturesCapturing Important Geologic Features

FLAT SPOTS

Will these also be gas??

Is it water or oil?

Possible Gas Sand

Tr:4822 IL :842

Tr:4819 IL :879

Tr:4815 IL :931

GAMBIR-1 PROSPECT

Capturing Important Geologic FeaturesCapturing Important Geologic Features

Improving Seismic Quality Through Multi-Attribute

Improving Seismic Quality Through Multi-Attribute

AMPLITUDE SWEETNESSAMPLITUDE+SEMBLANCESWEETNESS+SEMBLANCE

1616

Interpreting Fault

1717

Difficulty to do fault

interpretation onInline

Easy to do fault /hor.

Interpret. on Random line

How important

of identifying fault patterns

1818

Boundary Faults

Case1 of N

ew

Workflow

In Line

Xline Random Line

1919

2020

Fault

Planes

2121

Boundary Faults

Case1 of N

ew

Workflow

2222

Complex Faults area

Case2 of N

ew

Workflow

2323

FAULT DELINEATION WORK FAULT DELINEATION WORK FLOWFLOW

EARLIER WORKFLOWEARLIER WORKFLOW

SeisworkEven Similarity Prediction (ESP)SeisCube

NEW WORKFLOWNEW WORKFLOW

SeisworkEven Similarity Prediction (ESP)PostStack EarthCube AVI

2424

Advanced workflow for complex fault

system

Create ESP Cube

Poststack ESP

Fault Interpretation

Seiscube

Conventional

Seismic Data

QC Random Line

Book Marks Fun.

Faults Edit

SeisWorks

Workflow 2000

Horizon Auto. Tracking

ZAP!

Horizon Interpretation

Along random line

SEISWORK

MAPPING

2525

New Fault Delineation Workflow New Fault Delineation Workflow

ESP processing

Image Enhancment

AGC

EC Fault Labeling

Cube Math

CubeMath

Threshold64-127, min100,max5000000

Voxbody detect Values in range16/32-127

(Volume+128)*1000=Fmax1

(Fmax1+original volume)+Fmax1= Fmax2

Check if any F missing

yesno

Convert to .3dv

Cube Math

Voxbody as mask

(read to share Mom), *1000=Fmax

Remain faults only

Reduce unwanted “faults”

Make faults in max values

Add faults to original data

Pick up missing faults

Convert to .3dvFor interpret

Workflow 2001

2626

STEP-1STEP-1

Generate Event Similarity Prediction (ESP) Generate Event Similarity Prediction (ESP) CubeCube

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:Equation:

is a dip shift term is a dip shift term

M = M =

K= N + w/2 K= N + w/2

K= N - w/2 K= N - w/2 GK - HK+ GK - HK+

K= N + w/2 K= N + w/2

K= N - w/2 K= N - w/2 GK + HK+ GK + HK+

2727

STEP-1STEP-1

Where ESP used?Where ESP used?

Fault Delineations

Cross SectionMap View

2828

STEP-1STEP-1

Where ESP used?Where ESP used?

Stratigraphic Interpretation

Map View Cross Section

2929

STEP-1STEP-1

ESP CubeESP Cube

3030

STEP-2STEP-2Perform ESP Image Enhancement Perform ESP Image Enhancement

(PostStack)(PostStack)Before Image Enhancement

After Noise Image Enhancement (FK Fan Filter

and AGC)

3131

STEP-2STEP-2ESP Section before noise suppression ESP Section before noise suppression

(in EarthCube) (in EarthCube)

3232

STEP-2STEP-2ESP map view (in EarthCube)ESP map view (in EarthCube)

Much noise

3333

Much noise

STEP-2STEP-2ESP Section highlighted using Max Opacity ESP Section highlighted using Max Opacity

(in EarthCube) (in EarthCube)

3434

Too much “faults”

STEP-2STEP-2ESP Section after Image Enhancement ESP Section after Image Enhancement

(in EarthCube) (in EarthCube)

3535

STEP-3STEP-3Faults Parameterization in EarthCube using Faults Parameterization in EarthCube using

Automated Voxbody LabelingAutomated 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

3636

STEP-3STEP-3Automated Fault-body Labeling Automated Fault-body Labeling

and generate Cubeand generate Cube

3737

STEP-3STEP-3Before and After Fault Body LabelingBefore and After Fault Body Labeling

BeforeBefore AfterAfter

3838

STEP-4STEP-4Cube Math in AVICube Math in AVI

Faultbody label Cube 1 + Original Seismic CubeFaultbody label Cube 1 + Original Seismic Cube

3939

Some faults missing

STEP-4STEP-4Original Seismic with fault segmentsOriginal Seismic with fault segments

4040

STEP-5STEP-5Highlight fault segments within low Highlight fault segments within low

amplitude rangeamplitude range

4141

STEP-6STEP-6Perform Cube Math to add new fault Perform Cube Math to add new fault

label cube to the original seismic datalabel cube to the original seismic data

4242

Final Seismic Cube with fault tracesFinal Seismic Cube with fault traces

4343

Seismic Section with fault tracesSeismic Section with fault traces

4444

Fault traces in horizon sliceFault traces in horizon slice

4545

3D view of horizon with interpreted fault 3D view of horizon with interpreted fault traces traces

4646

New Fault Delineation Workflow New Fault Delineation Workflow

ESP processing

Image Enhancment

AGC

EC Fault Labeling

Cube Math

CubeMath

Threshold64-127, min100,max5000000

Voxbody detect Values in range16/32-127

(Volume+128)*1000=Fmax1

(Fmax1+original volume)+Fmax1= Fmax2

Check if any F missing

yesno

Convert to .3dv

Cube Math

Voxbody as mask

(read to share Mom), *1000=Fmax

Remain faults only

Reduce unwanted “faults”

Make faults in max values

Add faults to original data

Pick up missing faults

Convert to .3dvFor interpret

Workflow 2001

4747

Structural InterpretationStructural Interpretation

Exclusive Polygon

Inclusive Polygon

4848

Correlation ModeCorrelation Mode

4949

Editing Zapped Horizons Editing Zapped Horizons with Polygon Modewith Polygon Mode

5050

Auto Polygon GeneratorAuto Polygon Generator

5151

Horizon Interpretation Workshop Horizon Interpretation Workshop Screen 1

Colt Data set

Line 62

Start time 500 ms

Color bar bluwhtrd

5252

Horizon Interpretation Workshop Horizon Interpretation Workshop Screen 2

5353

Interpreting a Horizon Interpreting a Horizon

Show Position Information Bar

Horizon Interpretation Information Bar

5454

Horizon Interpretation Mode Horizon Interpretation Mode

Active Horizon

Selected but not Active Horizon in defined color

5555

Interpreting on Time Slices – Interpreting on Time Slices – Auto Tracking Mode Auto Tracking Mode

Portion of horizon already interpreted

5656

Zig Zag Display Zig Zag Display

Choose any one of these methods to display the lines:

Button 3  Select from Map  ZigZag

5757

Zig Zag Display Zig Zag Display Seismic View  Seismic  Select from Map  ZigZag

5858

Zig Zag Display Zig Zag Display

Midpoint Icon, then to Map View Button 3 ZigZag

5959

Intersection Circles Intersection Circles

Seismic View Contents Icon  Toggle ON Horizon Intersection Circles  OK

6060

ZigZag Display ZigZag Display

Line 60 Trace 140

Tie Point

Line 90

Note the Select from Map icon

6161

Loop Display Loop Display

Choose any one of these methods to display the lines:

•Click Button 3, then select Select from Map Loop

•In the Seismic View, select Seismic  Select from Map Loop

•Click the Midpoint icon, and then in Map View, click Button 3, and select Loop

6262

Loop DisplayLoop Display

Button 1

Button 2

6363

Loop DisplayLoop Display

Note the Select from Map icon

6464

Arbitrary Line DisplayArbitrary 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

6565

Arbitrary Line DisplayArbitrary Line Display

Button 1

Button 1

Button 1

Button 1

Use button 3 to open the popup menu. Select Begin Display

6666

Arbitrary Line DisplayArbitrary Line Display

6767

Seismic Fold and Intersection Seismic Fold and Intersection DisplaysDisplays

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

6868

Seismic Fold and Intersection Seismic Fold and Intersection DisplaysDisplays

Fold from Seismic

Cursor location at Button 1 click

Resulting Display

Note these instructions

6969

Seismic Fold and Intersection Seismic Fold and Intersection DisplaysDisplays

Intersection from Seismic

Resulting DisplayPlace cursor at the desired

intersection then press button 1.

7070

Delta system

Interpreting Stratigraphic

7171

Delta Fan

7272

Delta Fan

7373