Abstract

The Browse Basin lies offshore from Western Australia's Kimberley region and hosts vast accumulations of natural gas, some of which are rich in condensate, making it Australia's next major liquefied natural gas (LNG) producing province on the North West Shelf. This presentation discusses the four Mesozoic petroleum systems that are currently defined in the Browse Basin. There is a dry-gas-prone petroleum system, presumably sourced from the LowerMiddle Jurassic Plover Formation, which is pervasive across the entire basin. Three other petroleum systems are presently only recognised within the Caswell Sub-basin, being sourced by more liquid-prone source rocks within Jurassic and Lower Cretaceous sedimentary rocks. These petroleum systems are summarised as follows; EarlyMiddle Jurassic Petroleum System (Westralian 1, or W1); represented by accumulations on the BrecknockScott Reef Trend, mostly reservoired within the Plover Formation. Jurassic Petroleum System (Westralian 1 to 2, or W1W2); represented by the Crux gas accumulation, reservoired in Nome, Plover and Vulcan formations. Late Jurassicearliest Cretaceous Petroleum System (Westralian 2 and 3, or W2+W3); probably represented by the Ichthys (Brewster) accumulation reservoired in the Brewster Member of the upper Vulcan Formation. Early Cretaceous Petroleum System (Westralian 3, or W3); represented by the Cornea and Gwydion oil accumulations, and the Caswell 2 oil accumulation reservoired within either the Heywood or Jamieson formations. However, gas in the greater Cornea structure is typically biodegraded and may originate from the Plover Formation (W1) as determined by geochemical evidence from the carbon isotopic signature of neo-pentane. Further work is in progress to confirm these petroleum systems and redefine their extent by correlating the wet gases and oils with their source rocks.
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Product Type/Sub Type

nonGeographicDataset

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Creative Commons Attribution 4.0 International Licence

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Commonwealth of Australia (Geoscience Australia)

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Date (publication)

2015-01-01T00:00:00

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nonGeographicDataset

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geoscientificInformation

GA Catalogue Number

83966 Product http://www.ga.gov.au/metadata-gateway/metadata/record/83966/

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GA Publication
Earth Sciences

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English

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utf8

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distributor
Organisation Name
Commonwealth of Australia (Geoscience Australia)
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Canberra
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ACT
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2601
Country
Australia
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1dca0b63-1759-6029-e053-10a3070ad0a9

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ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

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1.1

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custodian
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address