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- 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.
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- 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.
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- 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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Basins Map || McArthur
|| Canning || Vulcan
|| Bonaparte || Browse
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