Develop Interpretation Strategy 4 4

Objectives Develop Interpretation Strategy -Observe the challenges on the data (data quality, fault complexity, event continuity, etc) -Build strong interpretation framework

Workflow Develop 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 Data

5 (data courtesy of KIDRA)

Scan Through The Data

Start Interpretation From The Well

Line 90SW-23 Interpreting on 2D Seismic data

Improving Seismic Quality Original Data 3-6 Hz filter After Envelope Scaling

Improving Seismic Quality

Capturing Important Geologic Features

FLAT SPOTS Will these also be gas?? Is it water or oil? Possible Gas Sand Tr:482 2 IL :842 Tr:481 9 IL :879 Tr:481 5 IL :931 GAMBIR-1 PROSPECT Capturing Important Geologic Features

Improving Seismic Quality Through Multi-Attribute AMPLITUDESWEETNESSAMPLITUDE+SEMBLANCESWEETNESS+SEMBLANCE

16 Interpreting Fault

17 Difficulty to do fault interpretation onInline Easy to do fault /hor. Interpret. on Random line How important of identifying fault patterns

18 Boundary Faults Case 1 of New Workflow In Line Xline Random Line

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20 Fault Planes

21 Boundary Faults Case 1 of New Workflow

22 Complex Faults area Case 2 of New Workflow

23 FAULT DELINEATION WORK FLOW EARLIER WORKFLOW Seiswork Even Similarity Prediction (ESP) SeisCube NEW WORKFLOW Seiswork Even Similarity Prediction (ESP) PostStack EarthCube AVI

24 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

25 New Fault Delineation Workflow New Fault Delineation Workflow ESP processing Image Enhancment AGC EC Fault Labeling Cube Math Threshold64-127, min100,max Voxbody detect Values in range16/ (Volume+128)*1000=Fmax1 (Fmax1+original volume)+Fmax1= Fmax2 Check if any F missing yes no 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.3dv For interpret Workflow 2001

26 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:  is a dip shift term M  = K= N + w/2 K= N - w/2   G K - H K +  K= N + w/2 K= N - w/2   G K + H K + 

27 STEP-1 Where ESP used? Fault Delineations Cross SectionMap View

28 STEP-1 Where ESP used? Stratigraphic Interpretation Map View Cross Section

29 STEP-1 ESP Cube

30 STEP-2 Perform ESP Image Enhancement (PostStack) Before Image EnhancementAfter Noise Image Enhancement (FK Fan Filter and AGC)

31 STEP-2 ESP Section before noise suppression (in EarthCube)

32 STEP-2 ESP map view (in EarthCube) Much noise

33 Much noise STEP-2 ESP Section highlighted using Max Opacity (in EarthCube)

34 Too much “faults” STEP-2 ESP Section after Image Enhancement (in EarthCube)

35 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

36 STEP-3 Automated Fault-body Labeling and generate Cube

37 STEP-3 Before and After Fault Body Labeling BeforeAfter

38 STEP-4 Cube Math in AVI Faultbody label Cube 1 + Original Seismic Cube

39 Some faults missing STEP-4 Original Seismic with fault segments

40 STEP-5 Highlight fault segments within low amplitude range

41 STEP-6 Perform Cube Math to add new fault label cube to the original seismic data

42 Final Seismic Cube with fault traces

43 Seismic Section with fault traces

44 Fault traces in horizon slice

45 3D view of horizon with interpreted fault traces

46 New Fault Delineation Workflow New Fault Delineation Workflow ESP processing Image Enhancment AGC EC Fault Labeling Cube Math Threshold64-127, min100,max Voxbody detect Values in range16/ (Volume+128)*1000=Fmax1 (Fmax1+original volume)+Fmax1= Fmax2 Check if any F missing yes no 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.3dv For interpret Workflow 2001

47 Structural Interpretation Structural Interpretation Exclusive Polygon Inclusive Polygon

48 Correlation Mode

49 Editing Zapped Horizons with Polygon Mode Editing Zapped Horizons with Polygon Mode

50 Auto Polygon Generator Auto Polygon Generator

51 Horizon Interpretation Workshop Screen 1 Colt Data set Line 62 Start time 500 ms Color bar bluwhtrd

52 Horizon Interpretation Workshop Screen 2

53 Interpreting a Horizon Show Position Information Bar Horizon Interpretation Information Bar

54 Horizon Interpretation Mode Active Horizon Selected but not Active Horizon in defined color

55 Interpreting on Time Slices – Auto Tracking Mode Portion of horizon already interpreted

56 Zig Zag Display Choose any one of these methods to display the lines: Button 3 Select from Map ZigZag

57 Zig Zag Display Seismic View Seismic Select from Map ZigZag

58 Zig Zag Display Midpoint Icon, then to Map View Button 3 ZigZag

59 Intersection Circles Seismic View Contents Icon Toggle ON Horizon Intersection Circles OK

60 ZigZag Display Line 60 Trace 140 Tie Point Line 90 Note the Select from Map icon

61 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

62 Loop Display Button 1 Button 2

63 Loop Display Note the Select from Map icon

64 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

65 Arbitrary Line Display Button 1 Use button 3 to open the popup menu. Select Begin Display

66 Arbitrary Line Display

67 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

68 Seismic Fold and Intersection Displays Fold from Seismic Cursor location at Button 1 click Resulting Display Note these instructions

69 Seismic Fold and Intersection Displays Intersection from Seismic Resulting Display Place cursor at the desired intersection then press button 1.

70 Delta system Interpreting Stratigraphic

71 Delta Fan

72 Delta Fan

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