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