Burial and exhumation history of the Galilee Basin, Australia: Implications for unconventional hydrocarbon prospectivity

I’Anson, Amy; Deighton, I.; Müller, R. Dietmar; Dutkiewicz, Adriana; Heine, Christian

doi:10.1306/0608171609417067

Cited by 5 publications

(2 citation statements)

References 31 publications

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“…Crustal extension factors associated with the early Permian rifting are modeled to be b = 1.1 or less, and inclusion of this event has no discernible impact on source-rock maturity (Hall et al, 2016b). The main driving force behind tectonic subsidence during the Eromanga Basin deposition is likely to have been dynamic topography effects associated with uplift of Australia's Eastern Highlands (Gallagher, 1988;Deighton et al, 2003;Raza et al, 2009;I'Anson et al, 2018).…”

Section: Burial and Thermal Historymentioning

confidence: 99%

Hydrocarbon prospectivity of the Cooper Basin, Australia

Hall

Palu

Murray³

et al. 2019

Bulletin

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The Pennsylvanian-Middle Triassic Cooper Basin is Australia's premier conventional onshore hydrocarbon-producing province. The basin also hosts a range of unconventional gas play types, including basin-centered gas and tight gas accumulations, deep dry coal gas associated with the Patchawarra and Toolachee Formations, and the Murteree and Roseneath shale gas plays.This study used petroleum systems analysis to investigate the maturity and generation potential of 10 Permian source rocks in the Cooper Basin. A deterministic petroleum systems model was used to quantify the volume of expelled and retained hydrocarbons, estimated at 1272 billion BOE (512 billion bbl and 760 billion BOE) and 977 billion BOE (362 billion bbl and 615 billion BOE), respectively. Monte Carlo simulations were used to quantify the uncertainty in volumes generated and to demonstrate the sensitivity of these results to variations in source-rock characteristics.The large total generation potential of the Cooper Basin and the broad distribution of the Permian source kitchen highlight the basin's significance as a world-class hydrocarbon province. The large disparity between the calculated volume of hydrocarbons generated and the volume so far found in reservoirs indicates the potential for large volumes to remain within the basin, despite significant losses from leakage and water washing. The hydrocarbons expelled have provided abundant charge to both conventional accumulations and to the tight and basin-centered gas plays, and the broad spatial distribution of hydrocarbons remaining within the source rocks, especially those within the Toolachee and Patchawarra Formations, suggests the potential for widespread shale and deep dry coal plays.

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Section: Burial and Thermal Historymentioning

confidence: 99%

Hydrocarbon prospectivity of the Cooper Basin, Australia

Hall

Palu

Murray³

et al. 2019

Bulletin

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“…only recently beginning to receive attention for its economic resource potential (Hansen and Uroda, 2018;I'Anson et al, 2018), but it may also contain valuable climatic and environmental records of the late Palaeozoic that have yet to be exploited. Of special importance is that the Galilee Basin was situated relatively far away from the tectonic activity in the New England Orogen and that it captures a terrestrial-marine transition from the north to the south and across the Springsure Shelf, which allows for detailed study of various depositional environments.…”

Section: Introductionmentioning

confidence: 99%

Palaeoenvironmental changes recorded in the palynology and palynofacies of a Late Permian Marker Mudstone (Galilee Basin, Australia)

et al. 2020

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Reconstructing the terrestrial palaeoenvironment during the end-Permian is made challenging by widespread erosion and ecosystem destruction. High-resolution sampling for palynofacies and palynology in sections that preserve the boundary interval allows for detailed examination of the drastic environmental changes that characterize the Permian-Triassic mass extinction. In the Bowen and Galilee basins in eastern Australia, this environmental perturbation is recorded within a Marker Mudstone that occurs above the uppermost Permian coal seams. The Marker Mudstone is used as a stratigraphic reference level at many localities, but has previously only been studied at a single locality in the Bowen Basin. In the present study, borehole Tambo 1-1A drilled in the Galilee Basin was selected to clarify whether this black, organic-rich mudstone marks a marine transgression, and to examine potential indicators of the end-Permian mass extinction. A total of 22 samples were taken from the mudstone unit, and from the over-and underlying strata and processed for palynology, palynofacies, and carbon isotope analysis. Biostratigraphic data indicate that the Marker Mudstone itself covers the uppermost part of unit APP5, with the first index taxa of unit APP6 floras occurring in samples less than 80 cm above this interval. This can be correlated with several other localities in the Bowen and Sydney basins where this shift occurs just above the uppermost Permian coal seam. Palynofacies data agree with previous interpretations of a southwards prograding delta that subsides as base level rises to form an extensive waterbody in which the Marker Mudstone was deposited. A change from translucent phytoclast-dominated to opaque phytoclast-dominated palynofacies within the Marker Mudstone suggests a shift to more oxic conditions in the water column, while base level begins to fluctuate, or increased terrestrial input from fluvial systems as the hinterland rises. Algal bodies resembling Botryococcus are found in the strata above the Marker Mudstone, but differ in morphology from the algal bodies found in the deltaic facies below. The presence of acanthomorph acritarchs in the Marker Mudstone and in the overlying Rewan Formation may indicate marine influence.Forms resembling fungal spores are present, but they do not show a "spike" as seen in other P-T boundary localities.The relative position of unit APP6 to the P-T boundary itself remains unclear.APP6 assemblages are dominated by simple acavate trilete and cavate trilete spores, which suggests stressed environment dominated by ferns and lycopods. The presence of degraded phytoclasts towards the top of the Marker Mudstone may also be used to suggest a mass-extinction interval. They may also be indicative of shifting local palaeoenvironmental changes, an interpretation that is supported by the low magnitude negative excursion of the δ 13 C isotope values within the Marker Mudstone.More datasets from the Bowen and Galilee basins will be essential to decoupling these signals.

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Burial and the affect on organics and gas reservoirs

Flores,

Moore

2024

Coal and Coalbed Gas

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Burial and exhumation history of the Galilee Basin, Australia: Implications for unconventional hydrocarbon prospectivity

Cited by 5 publications

References 31 publications

Hydrocarbon prospectivity of the Cooper Basin, Australia

Hydrocarbon prospectivity of the Cooper Basin, Australia

Palaeoenvironmental changes recorded in the palynology and palynofacies of a Late Permian Marker Mudstone (Galilee Basin, Australia)

Burial and the affect on organics and gas reservoirs

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