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3D GEO 3D Victoria Project Department of Primary Industry

by on Jun 10, 2009

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A framework sequence stratigraphic study of the onshore and offshore eastern Otway basin has been conducted as part of the 3D Victoria Initiative, in an attempt to resolve the complex stratigraphy and ...

A framework sequence stratigraphic study of the onshore and offshore eastern Otway basin has been conducted as part of the 3D Victoria Initiative, in an attempt to resolve the complex stratigraphy and contradictions and confusions present in the published literature. The results are promising at the present pilot scale, but the full details of the chronostratigraphy have not yet been finalised.

A number of seismic and well database issues have been addressed and partially resolved, but further database clean-up and improvements in general usability are required.

A series of seismic and well facies maps have been produced for the major depositional sequences and a number of interesting sub-sequences identified for further work. These maps provide a useful basis for regional-scale exploration and for the beginnings of prospectivity and play fairway analysis.

In the deepwater, gravity sliding is prominent as post-breakup differential subsidence tilted the margin. Some changes of structural style are also seen in the deepwater but these cannot be resolved at the present scale of study.

The results are presented in terms of petroleum systems and the implications for non-petroleum minerals and resources such as geothermal energy.

Further work is recommended in several areas:-
1) Definitively resolving the lithostratigraphic nomenclature and sequence stratigraphy from the eastern Otway to the Torquay embayment
2) Continuing this work with a further study at finer spatial and temporal scale
3) Additional database consolidation
4) Ties to other nearby basins along the Australian margin
5) Potential deepwater studies
6) Communication and distribution of the results of this present study
7) Consolidation of prior learnings from key individuals

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3D GEO 3D Victoria Project Department of Primary Industry 3D GEO 3D Victoria Project Department of Primary Industry Document Transcript