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Post-stack 3D merging to fast-track regional interpretation - offshore Otway Basin case study

Created 17/10/2025

Updated 17/10/2025

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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 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

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Field Value
Title Post-stack 3D merging to fast-track regional interpretation - offshore Otway Basin case study
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/9c127fc8-7a87-4b10-baa7-39704fef378b
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 17/06/2024
Geospatial Coverage
Map data © OpenStreetMap contributors
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Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Post-stack 3D merging to fast-track regional interpretation - offshore Otway Basin case study". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/post-stack-3d-merging-to-fast-track-regional-interpretation-offshore-otway-basin-case-study