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LIVE WEBINAR – Tectonic evolution of the Bight Basin and implications for prospectivity of the Ceduna Delta
Thursday, 25 June, 2020 @ 11:00 am - 12:00 pm (Australia/Perth time)Free – $10.00
Kindly supported by Rock Flow dynamics
This live webinar will take place at:
11am – Perth
12.30pm – Adelaide and Darwin
1pm – Brisbane, Canberra, Hobart, Melbourne, Sydney
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Tickets are free for members (please log in to see this) and $10 for non members.
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Tectonic evolution of the Bight Basin and implications for prospectivity of the Ceduna Delta.
Presented by Kevin Hill
A multi-disciplinary team has been analysing the tectonic evolution of Australia’s southern margin in the Bight Basin, using the Ion seismic data, gravity modelling, GA deepwater seismic data and the newly available high-quality 3D data across the Ceduna Delta. The goal of the project is to determine the tectonic evolution, particularly in terms of the subsidence history and uplift and erosional pulses recorded on the seismic data in the Ceduna Delta. These events have a significant impact on the hydrocarbon prospectivity.
Interpretation of Ion seismic and regional gravity data defined the deep basin geometry down to the Moho and the GA seismic data were reinterpreted to indicate palaeobathymetry in the now deep-water parts of the basin and the likely facies. A new, fully balanced, decompacted and restored regional section across the delta shows the deposition and deformation through time with emphasis on the erosional events and water depths. Significantly, the sectiosn are restored to paleo-water depth at all times, which significantly changes the basin geometry, the interpretation of facies and migration directions. In addition, a forward model in MoveTM shows how the gravitational collapse structures formed allowing the early delta to propagate. Combining all this information has allowed a model to be developed for the basin evolution which can predict the timing and size of structural traps, the timing of maximum burial and hydrocarbon charge and the direction of charge (landward vs seaward). The final step is full Underworld finite element modelling of the basin to test models of Australia-Antarctica breakup and to predict temperature through time and hence hydrocarbon charge.