ARAFURA BASIN
  • AFTA thermal history solutions from a typical sample, Torres-1. The red fields show the AFTA-derived time temperature constraints and the solid line shows the reconstructed thermal history.
  • Cooling from maximum palaeotemperatures of >140°C beginning some time in the Middle Triassic to Middle Jurassic (220-150 Ma). Cooling from peak palaeotemperatures began at some time in the last 40 Ma (Eocene to Recent).
  • The dashed paths shows the Default Thermal History for this sample.
  • Reconstructed thermal history of units preserved in Torres-1 based on thermal history interpretation of AFTA and VR data from multiple samples.
  • Two palaeothermal episodes have been recognised, with cooling beginning between 220 and 150 Ma attributed to decline in basal heat flow combined with uplift and erosion.
  • Cooling beginning sometime between 40-0 Ma is attributed soley to uplift and erosion.
  • Timing limits derived from all AFTA samples in this well are shown as the grey shading.
  • Cessation of active source rock maturation in pre-Jurassic rocks at 200 Ma is due to cooling as a response to decline in basal heat flow and significant (1500 m) uplift and erosion.
  • The Tertiary thermal episode has no effect on the source rock maturation history in the deeper section, as palaeotemperatures during this episode were less than those during the Middle Triassic-Middle Jurassic.
  • Subsequent burial did result in renewed maturation in the shallower section, with cessation between 40 and 0 Ma.
  • The grey columns represent the two major thermal episodes revealed by AFTA in an integrated analysis of several samples from this well.

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