BASIN: LONDONDERRY HIGH
- Reconstructed thermal history of units preserved in Rob Roy-1
based on thermal history interpretation of AFTA and VR.
- Two paleo-thermal episodes have been recognised.
- Cooling beginning between 240 and 170 Ma (Middle Triassic
to Middle Jurassic) attributed to decline in basal heat flow
combined with uplift and erosion.
- Cooling beginning between 55 and 30 Ma (Paleocene-Oligocene)
attributed solely to uplift and erosion.
Timing limits derived from AFTA samples in this well are shown
as the grey shading.
- Reconstructed burial history for Rob Roy-1 based on the thermal
history interpretation of the AFTA and VR data.
- Two uplift and erosion episodes have been interpreted from the
thermal history results.
- Timing limits derived from AFTA samples in this well are shown
as the grey shading, while the lighter shading represents the
timing of additional unconformities in the well.
- The figure shows cessation of active source rock maturation
in the deeper section at 180 Ma (240-170 Ma allowed by AFTA) due
to cooling as a response to decline in basal heat flow and minor
(600 m) uplift and erosion.
- The Tertiary thermal episodes have no effect on the source rock
maturation history in the deeper section, as paleotemperatures
during this episode were less than those during the Middle Triassic-Middle
Jurassic. However, subsequent burial did result in renewed maturation
in the shallower section, with cessation of active maturation
and 30 Ma.
Basins Map || Arafura
|| McArthur || Canning
|| Vulcan || Bonaparte