New insights into the Exmouth Sub-basin from basin and petroleum system modelling

Schenk, Oliver; Dempsey, Craig; Benson, Robbie; Cheng, Michael L.; Tewari, Sugandha; Karvelas, Alexander; Bancalà, Giuseppe

doi:10.1080/22020586.2019.12072963

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…Gross depositional environment (GDE) maps have been generated for these Jurassic sequences incorporating 3D seismic attribute analysis and spectral decomposition. These have been used to constrain an integrated petroleum systems model which provides new insights into remaining hydrocarbon potential of the Exmouth Sub-basin (Schenk et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

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New insights into the Exmouth Sub-basin: tectono-stratigraphic evolution

Dempsey

Benson

O’Halloran

et al. 2019

ASEG Extended Abstracts

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Section: Discussionmentioning

confidence: 99%

“…The timing of this phase of igneous activity as well as the observation of late Triassic active extension has important implications for thermal modelling and petroleum systems within the basin (Schenk et al, 2019).…”

Section: Late Jurassic Igneous Activitymentioning

confidence: 99%

New insights into the Exmouth Sub-basin: tectono-stratigraphic evolution

Dempsey

Benson

O’Halloran

et al. 2019

ASEG Extended Abstracts

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Basin-to-prospect-scale subsurface characterisation: new insights into the Exmouth Sub-basin, North West Shelf, Australia

Kholiq¹,

Jacob²,

Lim³

et al. 2021

The APPEA Journal

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The Exmouth Sub-basin represents part of the intracratonic rift system of the northern Carnarvon Basin, Australia. Hydrocarbon exploration has resulted in the discovery of a variety of oil and gas accumulations, mainly in Upper Triassic, Upper Jurassic and Lower Cretaceous intervals. Recent 3D petroleum systems modelling aided in understanding the interaction of the complex basin evolution and hydrocarbon charge history, shedding light on the variety and distribution of hydrocarbon types encountered, whilst also highlighting future remaining potential in both proven and untested plays. As a result of this modelling, the Exmouth Subsurface Characterisation Study was commissioned to further leverage >12000km2of recently acquired and processed seismic data and integrate data from specifically conditioned wells from across the Exmouth Sub-basin. The primary study objective was to better understand the distribution of lithologies across the basin, with focus upon the reservoir presence and properties over proven and potential deeper sections. Furthermore, given the variety of hydrocarbon types encountered, this study set out to understand the amplitude behaviour of these types within the different reservoirs. Collectively, these results have aided in identifying analogous hydrocarbon amplitude responses across the basin, derisking identified plays, prospects and existing discoveries and fields whilst also identifying new plays and leads.

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The magma plumbing system of the Northern Carnarvon Basin, offshore Australia: multiscale controls on basin-wide magma emplacement, and implications for petroleum exploration

Curtis,

Holford,

Bunch

et al. 2024

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The Northern Carnarvon Basin (NCB) located on Australia's North West Shelf hosts an extensive (∼40,000 km 2 ) intrusive igneous complex related to Mesozoic rifting and breakup. Using an extensive suite of modern 3D seismic reflection surveys, we have mapped this intrusive system across the NCB. We identify three predominant intrusion morphologies: Stacked sheets of large interconnected sill intrusions (up to ∼170 km long) and smaller (8 to 30 km long) isolated, strata concordant intrusions, which often interact with normal faults emplaced into deltaic sedimentary rocks; and variably sized (10 to 40 km long) saucer-shaped intrusions emplaced into marine shales, spread across seven zones (geographically constrained groups of intrusions of a specific morphology). We consider the zones' margin-parallel orientation, suggesting control by sub-crustal extensional processes during rifting; and, variation in intrusion morphology between these zones, suggesting a dominant control by host rock mechanical properties. We integrate previous work with our observations, constraining emplacement to between the Kimmeridgian and Valanginian, coinciding with key phases of margin evolution. Finally, we assess the impact of this intrusive complex on local petroleum systems. There is likely little to no adverse impact on source rock maturation or reservoir contamination by CO 2 . But, there is a spatial dissociation between the location of groups of intrusions and the gas fields, particularly in the Exmouth Plateau; this suggests that migrating hydrocarbons may be blocked, baffled and/or redirected by emplaced igneous rocks.

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New insights into the Exmouth Sub-basin from basin and petroleum system modelling

Cited by 4 publications

References 14 publications

New insights into the Exmouth Sub-basin: tectono-stratigraphic evolution

New insights into the Exmouth Sub-basin: tectono-stratigraphic evolution

Basin-to-prospect-scale subsurface characterisation: new insights into the Exmouth Sub-basin, North West Shelf, Australia

The magma plumbing system of the Northern Carnarvon Basin, offshore Australia: multiscale controls on basin-wide magma emplacement, and implications for petroleum exploration

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