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Compositional Kinetics for the Lower Cretaceous Eumeralla Formation, Otway Group, Otway Basin, Australia

Created 17/10/2025

Updated 17/10/2025

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Geoscience Australia currently uses two commercial petroleum system modelling software packages, PetroMod https://www.software.slb.com/products/petromod and Zetaware http://www.zetaware.com, to undertake burial and thermal history modelling on wells in Australian sedimentary basins. From the integration of geological (age-based sedimentary packages, uplift and erosional events), petrophysical (porosity, permeability, and thermal conductivity) and thermal (downhole temperature, heat flow, vitrinite reflectance, and Tmax) input data, to name the most significant, a best-fit model of the time-temperature history is generated. Since the transformation of sedimentary organic matter (kerogen) into petroleum (oil and gas) is a chemical reaction, it is governed by chemical kinetics i.e. time and temperature (in the geological setting, pressure is of secondary importance). Thus, the use of chemical kinetics associated with a formation-specific, immature potential source rock (where available) from the basin of interest is considered a better practical approach rather than relying on software kinetic defaults, which are generally based on the chemical kinetics determined experimentally on Northern Hemisphere organic matter types. As part of the Offshore Energy Systems program hydrocarbons from the Lower Cretaceous Eumeralla Formation were selected where available from onshore wells; compositional kinetics (1-, 2-, 4- and 14-component (phase) kinetics) were undertaken by GeoS4, Germany. The phase kinetics approach is outlined in Appendix 1. This report provides the compositional kinetics for potential source rocks from the Lower Cretaceous Otway Group, Otway Basin, Australia. The kinetic data were used in the offshore petroleum system modelling reported in Schenk et al. (2021).

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Field Value
Title Compositional Kinetics for the Lower Cretaceous Eumeralla Formation, Otway Group, Otway Basin, Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/27257c58-9906-4225-bc9f-05be03fa7def
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 15/10/2021 - 16/10/2023
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        129.0,
        -39.0
      ],
      [
        141.0,
        -39.0
      ],
      [
        141.0,
        -26.0
      ],
      [
        129.0,
        -26.0
      ],
      [
        129.0,
        -39.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Compositional Kinetics for the Lower Cretaceous Eumeralla Formation, Otway Group, Otway Basin, Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/compositional-kinetics-for-the-lower-cretaceous-eumeralla-formation-otway-group-otway-basin-aus