Authors / CoAuthors
Rollet, N. | Edwards, D. | Grosjean, E. | Palu, T.J. | Hall, L. | Totterdell, J. | Boreham, C. | Murray, A.
Abstract
The Browse Basin hosts considerable gas and condensate resources, including the Ichthys and Prelude fields that are being developed for liquefied natural gas (LNG) production. Oil discoveries are sub-economic. This multi-disciplinary study integrating sequence stratigraphy, palaeogeography and geochemical data has mapped the spatial and temporal distribution of Jurassic to earliest Cretaceous source rocks. This study allows a better understanding of the source rocks contribution to the known hydrocarbon accumulations and charge history in the basin, including in underexplored areas. The Jurassic to earliest Cretaceous source rocks have been identified as being the primary sources of the gases and condensates recovered from accumulations in the Browse Basin as follows: - The Lower–Middle Jurassic J10–J20 (Plover Formation) organic-rich source rocks have been deposited along the northeast-southwest trending fluvial-deltaic system associated with a phase of pre-breakup extension. They have charged gas reservoired within J10–J20 accumulations on the Scott Reef Trend and in the central Caswell Sub-basin at Ichthys/Prelude, and in the Lower Cretaceous K40 supersequence on the Yampi Shelf. - Late Jurassic–earliest Cretaceous J30–K10 source rocks are interpreted to have been deposited in a rift, north of the Scott Reef Trend and along the Heywood Fault System (e.g. Callovian–Tithonian J30–J50 supersequences, lower Vulcan Formation). The J30–K10 shales are believed to have sourced wet gas reservoired in the K10 sandstone (Brewster Member) in the Ichthys/Prelude and Burnside accumulations, and potentially similar plays in the southern Caswell Sub-basin. - The organic-rich source rocks observed in the Heywood Graben may be associated with deeper water marine shales with higher plant input into the isolated inboard rift. They are the potential source of fluids reservoired within the Crux accumulation, which has a geochemical composition more closely resembling a petroleum system in the southern Bonaparte Basin.
Product Type
document
eCat Id
114301
Contact for the resource
Author
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
- ( Theme )
-
- Browse Basin
- ( Theme )
-
- Jurassic
- ( Theme )
-
- source rocks
- ( Theme )
-
- palaeogeography
- ( Theme )
-
- petroleum systems
-
- Published_External
Publication Date
2018-03-14T03:20:14
Creation Date
2017-10-06T10:00:00
Security Constraints
Legal Constraints
Status
Purpose
Extended Abstract for AEGC 2018 Conference
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
Not supplied
Parent Information
Extents
[-17, -12.5, 120, 125]
Reference System
Spatial Resolution
Service Information
Associations
Source Information