McARTHUR BASIN

 

  • AFTA thermal history solutions (solid path) for Roper Group sample GC16-7. The red fields show the AFTA-derived time temperature constraints.
  • Cooling from paleotemperatures of >105°C beginning some time in the early Triassic to Early Cretaceous (240-125 Ma). With cooling from a lower peak in palaeotemperatures of 80 to 95°C beginning some time in the Early Cretaceous to Miocene (115 to 20 Ma).
  • The dashed blue path shows the Default Thermal History for this sample.
  • The red dashed arrow shows an alternative thermal history path that is also compatible with the data.

 

  • Schematic illustration of the thermal history of Roper Group sample GC16-7 derived from the AFTA results compared with a thermal history commonly used to explain the organic maturity results in this area of the McArthur Basin.
  • It is clear that AFTA provides a significant improvement in the understanding of the hydrocarbon generation history at Broadmere-1, unavailable from other techniques.

  • This figure shows variation of maturity with time for Broadmere-1 derived from the reconstructed thermal history illustrated in the above Figure.
  • The grey columns represent the two major thermal episodes revealed by AFTA. The figure shows cessation of active source rock maturation throughout the entire Proterozoic section at 180 Ma (240-200Ma allowed by AFTA) due to cooling as a response to significant (2000m) uplift and erosion associated with the Fitzroy movement.
  • The subsequent thermal episodes have no effect on the source rock maturation history anywhere in the section, as palaeotemperatures were less than those during the Middle Triassic-Middle Jurassic.

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