Authors / CoAuthors
Gunning, M. | Wilkinson, S | Chau, P | Mitchell, C | Badry, J
Abstract
<div>Ideally when combining different 3D seismic surveys differences in acquisition parameters warrant full pre-stack reprocessing from field data. However, there are occasions where this is not possible due to time, financial or data access constraints; a valuable alternative is post-stack merging and enhancement of existing migrations. The offshore Otway Basin was the subject of such a project, the objective of which was to produce a regularised and seamless 3D dataset of the highest possible quality, within a two-month turnaround time. The input migrated volumes varied by data extent, migration methodology, angle range and grid orientation. 14 input volumes totalling 8,092 km2 were post-stack merged and processed to produce a continuous and consistent volume, enabling more efficient and effective interpretation of the region. The surveys were regularised onto a common grid, optimised for structural trend, prior to survey matching. DUG’s mis-tie analysis algorithm, applied over a time window optimised for interpretation of key</div><div>events, was used to derive corrections for timing, phase and amplitude, using the Investigator North survey as a reference. This was followed by time-variant spectral and amplitude matching, with gain corrections applied, to improve continuity between volumes. Additional enhancements including noise removal and lateral amplitude scaling were also applied. The final merged volume offers significant uplift over the inputs providing better imaging of structure and event and dramatically improving the efficiency and quality of interpretation. This enables rapid reconnaissance of the area by explorers. Presented at the Australian Energy Producers (AEP) Conference & Exhibition
Product Type
document
eCat Id
149209
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Keywords
- ( Project )
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- Otway Basin
- ( Project )
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- 3D Mega merge
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- offshore Otway Basin
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- 3D seismic
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- post-stack merge
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- seismic reprocessing
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- marine seismic
- theme.ANZRC Fields of Research.rdf
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- Seismology and seismic exploration
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- Published_External
Publication Date
2024-07-01T04:40:44
Creation Date
2024-01-04T05:00:00
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Status
completed
Purpose
Extended Abstract - Conference paper - Promote Otway 3D Mega merge
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Australian Energy Producers (AEP) Conference & Exhibition 20-23 May 2024, Perth WA
Lineage
<div>Extended abstract for the Oral Presentation at AEP 2024</div>
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Extents
[-41.00, -37.00, 138.00, 144.00]
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