CANNING BASIN

 

  • AFTA thermal history solutions (solid path) for Grant Fm sample GC35-1. The red fields show the AFTA-derived time temperature constraints.
  • Cooling from maximum palaeotemperatures of 105-125°C beginning some time in the Late Triassic to Early Cretaceous (230-180 Ma). With cooling from a lower peak in palaeotemperatures of 75 to 95°C beginning at some time in the Early Cretaceous to Early Tertiary (130 to 60 Ma).
  • The dashed path shows the Default Thermal History for this sample.

 

  • Reconstructed thermal history for White Hills-1 using a constant palaeogeothermal gradient of 31°C/km and palaeo-surface temperature of 20°C for the entire history, as derived from the AFTA and VR results.
  • The history illustrated (solid lines) shows a heating period following each of two most recent thermal episodes, this is not constrained by AFTA, and a range alternative histories with less heating are also possible, limited by the dashed paths.

  • This figure shows variation of maturity with time for White Hills-1 derived from the reconstructed thermal history illustrated in the above Figure.
  • The grey columns represent the three thermal episodes revealed by AFTA. The figure shows cessation of active source rock maturation in the entire drilled section at 200 Ma (230-180 Ma allowed by AFTA) due to cooling as a response to kilometre-scale uplift and erosion attributed to the Fitzroy Movement. The recognition that heat flow during this tectonic event was not elevated is consistent with this event being associated with a major strike-slip structural event.
  • Early Cretaceous and Tertiary thermal episodes have no effect on the source rock maturation history, as palaeotemperatures during these episodes were less than those during the Late Triassic-Early Jurassic.

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