BROWSE 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 between 55
    and 30 Ma.

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