Authors / CoAuthors
Johnson, L.M. | Rezaee, R. | Smith, G.C. | Mahlstedt, N. | Edwards, D.S. | Kadkhodaie, A. | Yu, H.
Abstract
Pyrolysis and bulk kinetic studies were used to investigate the hydrocarbon generation potential and source rock facies variability of the marine organic-rich rocks from the Middle Ordovician (Darriwilian) Goldwyer Formation in the Canning Basin, Western Australia. Rock Eval pyrolysis results for the analysed immature to mid-mature calcareous mudstones imply that the upper Goldwyer Sequence I samples contain oil-prone Type I kerogen, while the lower Goldwyer Sequence III samples comprise on average Type II/III oil- and gas-prone kerogen. This is supported by the pyrolysis gas chromatography (Py-GC) results that show the presence of homogenous organofacies in the Goldwyer Sequence I that comprise aliphatic molecular signatures, possibly attributed to the selective preservation of the lipid fraction derived from <i>Gloeocapsomorpha prisca</i> (<i>G. prisca</i>). The heterogeneous organofacies of the Goldwyer Sequence III contains aromatic moieties that are present in similar abundance as the aliphatic compounds. The calcareous claystones of the Goldwyer Sequence I have the capacity to generate paraffinic oil with low wax contents, whereas those of the Goldwyer Sequence III have generative potential for paraffinic-naphthenic-aromatic (P-N-A) low wax oils and gas and condensate. The temperature for hydrocarbon generation for the Type I kerogen, assuming a constant geological heating rate of 3<sup>o</sup>C/Ma, is estimated to occur over a narrow interval between 145<sup>o</sup>C and 170<sup>o</sup>C for the Goldwyer Sequence I samples. Generation from the Type II/III kerogen occurs from 100°C to 160°C in the Goldwyer Sequence III samples which are significantly thermally less stable than observed for the Goldwyer Sequence I samples. The kinetics results for both sequences were used in standard thermal and burial history plots to evaluate their transformation ratio and hydrocarbon generative potential. This provided a basin-specific kinetic input for burial history modelling and a better constraint for kerogen transformation and hydrocarbon generation on the Broome Platform. <b>Citation:</b> Lukman M. Johnson, Reza Rezaee, Gregory C. Smith, Nicolaj Mahlstedt, Dianne S. Edwards, Ali Kadkhodaie, Hongyan Yu,; Kinetics of hydrocarbon generation from the marine Ordovician Goldwyer Formation, Canning Basin, Western Australia,<i> International Journal of Coal Geology</i>, Volume 232, <b>2020</b>, 103623, ISSN 0166-5162, https://doi.org/10.1016/j.coal.2020.103623.
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document
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144066
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- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
- ( Theme )
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- Compositional kinetics
- ( Place )
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- Canning Basin
- ( Discipline )
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- petroleum systems modelling input
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- Published_External
Publication Date
2024-09-08T23:54:23
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Manuscript to be submitted to International Journal of Coal Geology
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geoscientificInformation
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International Journal of Coal Geology Volume 232, 1 December 2020 103623
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Publication of organic geochemistry data generated in Geoscience Australia's laboratory and with external collaborator Lukeman Johnson, Curtin University.
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[-24.00, -17.00, 120.00, 128.00]
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