Seismic Balancing to Improve Interpretation Results – A Case Study from the Joseph Bonaparte Gulf

Keith Woollard - GeoCom Services Australia Pty Ltd

Audrey Leonard - Woodside Energy Limited

Amanda Panting - Woodside Energy Limited

In Alliance with

What Are We Going To See?

Nothing new Nothing high tech Nothing expensive Not even any 3d

Cost effective methodology to improve interpretability of multi-vintage 2d

Introduction

The Woodside Energy Limited and Shell Alliance was awarded 3 blocks Offshore Southern Bonaparte Basin

6500km 2d seismic recorded and processed Existing 8 bit loaded seismic grid

20000km44 “vintages” ranging from 1967 to 1997670 seismic linesGood data qualitySome loading problems

Location

Seismic CoverageWA279P&WA280P STUDY AREA

127°30'00"E 128°00'00"E 128°30'00"E 129°00'00"E 129°30'00"E

15°30'00"S

15°00'00"S

14°30'00"S

14°00'00"S

13°30'00"S

300 000M E 400 000M E 500 000M E 600 000M E

8 300 000M N

8 400 000M N

8 500 000M N

127°00'00"E 130°00'00"E16°00'00"S

13°00'00"S

Woodside Offshore Petroleum

Author :

Date : 18-AUG-1999 08:32:03

Drafted By : wopt5h

Mapsheet : TSH_WA279P&WA280P

Zone : 52Scale : 1:500000

Enc losure :

0 10 20 30 40 501:500000

KILOMETRES

0 4 8 12 16 20

MILES

UNI VERSAL TRANSVERSE MERCATOR PROJECTI ON

AUSTRALI AN NATI ONAL SPHEROI D

CENTRAL MERI DI AN 129°00'00"E

EP 66

EP(A) 74

EP(A) 75

NT/P 46

NT/P 57

RL 1

EP 386

WA-128-P

WA-18-P

WA-279-P

WA-280-P

Barnett-1Barnett-2Barnett-3

Berkley-1

Billawock-1

Bonaparte-1

Bonaparte-2

Bougainville-1

Bullo River-1

Cambridge-1

Cape Ford-1

Frigate-1

Garimala-1Keep River-1

Kingfisher-1

Kinmore-1

Kulshill-1Kulshill-2

Lacrosse-1

Legune Water Bore-1

Legune Water Bore-4Legune Water Bore-6

Lesueur-1

Matilda-1

Moyle-1

Ningbing-1Ningbing-2

Pelican Island-1

Penguin-1

Pincombe-1

Sandpiper-1

Skull-1

Spirit Hill-1

Sunbird-1

Tern-1

Tern-2

Tern-3

Tern-4Tern-5

Turtle-1Turtle-2

Vienta-1

Waggon Creek-1Waggon Creek-1aWeaber-1Weaber-2Weaber-2aWeaber-3Weaber-4Weaber-5

Example Traverse

89BO CB94 89RX 99W CB80

Computing the Misties

Why use Statistics?

Balanced Traverse

Comparison Traverse

FastTrack Setup

FastTrack OutputRaw Balanced

FastTrack OutputRaw Balanced

Non-normalised AmplitudeRaw Balanced

Normalised Amplitude

ms

ms

amplitudes

mplitudeFastTrackANormalised

150

150

)(751

Raw Balanced

Effect of Phase on AmplitudeRaw Balanced

FastTrack Setup

FastTrack RunRaw Balanced

Normalised FastTrack AmplitudeRaw Balanced

Mispicked SeismicRaw Balanced

Mispicked SeismicRaw Balanced

Summary

Used only standard tools, SeismicBalance and UNIX

Significantly increased the quality of regional 2d dataset

Allowed better use of Autotrackers Mapping is faster and more reliable

Acknowledgments

Woodside Energy Limited Shell Development Australia