Thermal Modelling and Basin Analysis


Program Manager: Dr Peter Tingate

The Officer Basin contains Neoproterozoic-Palaezoic shallow marine to terrestrial sediments separated by unconformities that represent regional deformational and erosional events. These events range in age from the latest Neoproterozoic to mid-Palaeozoic. It is difficult to assess the thermal effects of these events as these sediments are not suitable for vitrinite reflectance determinations.

At least two or three regional thermal episodes have been revealed by AFTA results between 270 Ma and the present day, all younger than previously recognised tectonic episodes in the broader region. All of the events must have involved kilometre-scale erosion, even allowing for the possibility of elevated basal heat flow associated with some episodes. The study demonstrates the unique ability of AFTA fission track results in constraining the thermal, burial and hydrocarbon maturity histories in old basins, where conventional technologies cannot be applied. Integration with MPI data provides further insights into the thermal and hydrocarbon maturation histories not available from either technique when used in isolation.

In particular, thermal history reconstruction has allowed ranking of previously recognised tectonic events in terms of their thermal importance, but has also revealed younger thermal events that have a significant impact on hydrocarbon prospectivity.

Two papers was presented (FT2000 and AAPG- Bali) and a manuscript submitted in 2000.


PROJECTS


MSc project: Formation Water Resistivities in the Carnarvon Basin
MSc student: Srdjan Jovanovic (Commenced 1995, part time)
Supervisor: Dr Peter Tingate
Scholarship support: Self funded