THERMAL HISTORY RECONSTRUCTION

What is THR?

Thermal History Reconstruction is the integration of thermal history constraints, principally derived from AFTA and VR (vitrinite reflectance) data from individual well and outcrop samples, to provide a rigorous time-temperature framework for the understanding of the structural, tectonic, fluid and hydrocarbon maturation histories of a sedimentary basin.

It involves the direct determination of:

  • Maximum paleotemperature.
  • Time at which cooling from maximum paleotemperature began.
  • The style of the cooling history (including estimates of peak paleotemperature and time of cooling during later heating episodes in which paleotemperatures were lower than the maximum).
  • The paleogeothermal gradient (paleotemperature profile) at the time of maximum paleotemperatures and at the time of any later heating episode in which a subsequent paleotemperature peak was reached.

Interpretation of the paleotemperature profile enables assessment of the mechanism of heating and cooling, eg.:

  • additional burial.
  • higher basal heat flow.
  • lateral heating by hot fluids.
  • or a combination of processes.

Use of AFTA in constructing the paleotemperature - depth plot: A fundamental parameter in THR.

A user's perspective ... "Why I use THR"

An example of the application of THR:  Anglesea-1

 

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