Stochastic Simulation attended the Petroleum Exploration Society of Australia (PESA) WA technical lunch on the “evolution of the northern and western margins of Australia”, presented by speaker Chris Elders. It was held at the Parmelia Hilton Hotel in Perth on May 19th in Perth, Western Australia.
Missed out on going? Not to worry, our DrillAssure Engineers were present at the event and took down the most important notes they learned from the technical lunch. Get a snapshot summary below.
But first, here’s what the whole Technical Lunch was about:
Abstract of PESA’s Technical Lunch:
The evolution of the NW Shelf of Australia and the Perth Basin has been extensively studied, but certain aspects continue to intrigue. These include:
- The relatively short time period between the final stages of terrane amalgamation and the start of basin formation on the western margin of Australia
- The tectonic setting in which continental ribbons successively detach from the north west margin of Australia
- Lower Palaeozoic and Upper Palaeozoic basin evolution
- Variations in the timing, distribution and orientation of Mesozoic extension associated with the separation of Argoland, and the limited evidence for transpression (or otherwise) at this time.
- The distribution of uplift, and the distribution of extension associated with the Lower Cretaceous separation of Greater India from Australia, and the possible role of a mantle plume
- The development of large scale folds and Pliocene reverse reactivation of extensional faults on an apparently passive margin
The large volumes of readily available, public domain 2D & 3D seismic data makes it possible to investigate the questions at both a regional scale and in local detail. This undoubtedly aids in understanding the complexity of the evolution of these continental margins, but also enables development, and in some instances, re-evaluation, of concepts based on sparser data sets.
Key Notes our Stochastic Simulation’s DrillAssure Engineers Took Down:
- Overall, the talk focused on the geodynamic settings at different Australian margins; focus was more on Northern and Western margin as the presenter believed Southern Margin is relatively more simple and passive compared to the other two.
- The presenter, seems to be of the opinion that Fitzroy movement in many cases is an extension event and was unable to understand the role of synchronous compression in it.
- Different rift events and their effects on different basins were discussed
- Carboniferous and Permian rifting according to him, proved out to be the fundamental control for geometry of mesozoic rifts
- There were a few things he was not sure and said need more investigation includes the Canning Basin transgression.
- While discussing the proterozoic crustal structures, he said there is still alot to be understood about it and an unusual geodynamic setting could be either Plume related or back arc extension.
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