Authors / CoAuthors
Spaak, G. | Edwards, D.S. | Foster, C.B. | Murray, A. | Sherwood, N. | Grice, K.
Abstract
<p>A geochemical study was conducted to establish oil-oil correlations and evaluate potential source rocks within the latest Devonian–earliest Carboniferous succession of the onshore Canning Basin, Western Australia. Aromatic hydrocarbons, together with the routinely used saturated biomarker ratios and stable carbon isotopes, demonstrate that the recently discovered Ungani oilfield located on the southern margin of the Fitzroy Trough are similar, but not identical, to the early Carboniferous Larapintine 4 (L4) oil family present to the north of the Fitzroy Trough on the Lennard Shelf. The L4 oil family has been correlated to a lower Carboniferous (Tournaisian) source rock core sample from the Laurel Formation at Blackstone-1 although its bulk geochemical properties signify that it could generate substantially more gas than liquid hydrocarbons. <p>The Ungani oils can be distinguished from the L4 oils by their higher concentrations of paleorenieratane and isorenieratane, coupled with more depleted δ<sup>13</sup>C values for n-alkanes, pristane and phytane compared with other components. Hopane isomerisation ratios show distinct grouping of the two oil families that reflect both source and maturity variations. The oil from Wattle-1 ST1 on the Lennard Shelf also has an unusual composition, exhibiting some molecular and isotopic features similar to both the L4 and Ungani oils. Source rocks for the Ungani and Wattle-1 ST1 oils are unknown since their geochemical signature does not match that of the Tournaisian Laurel Formation or the Middle−Upper (Givetian–Frasnian) Devonian Gogo Formation which sourced the Devonian-reservoired Larapintine 3 oils at Blina and Janpam North-1. It is postulated that such potential oil-prone source rocks could occur within the Famennian–Tournaisian succession. <b>Citation:</b> Gemma Spaak, Dianne S. Edwards, Clinton B. Foster, Andrew Murray, Neil Sherwood, Kliti Grice, Geochemical characteristics of early Carboniferous petroleum systems in Western Australia,<i> Marine and Petroleum Geology</i>, Volume 113, 2020, 104073, ISSN 0264-8172. https://doi.org/10.1016/j.marpetgeo.2019.104073
Product Type
document
eCat Id
110663
Contact for the resource
Point of contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Resource provider
Point of contact
- Contact instructions
- MEG
Keywords
- theme.ANZRC Fields of Research.rdf
-
- EARTH SCIENCES
-
- Canning Basin
-
- Carboniferous
-
- Biomarkers
- theme.ANZRC Fields of Research.rdf
-
- EARTH SCIENCES
-
- Published_External
-
- Devonian
-
- Ungani oilfield
-
- oil-sourced correlation
-
- aromatic carotenoids
-
- photic zone euxinla
-
- alkylbenzenes
-
- stable carbon isotopes
Publication Date
2019-10-29T04:38:00
Creation Date
2017-05-17T00:00:00
Security Constraints
Classification - unclassified
Legal Constraints
Status
completed
Purpose
Manuscript for submissions to Marine and Petroleum Geology
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Marine and Petroleum Geology Volume 113 March 2020 104073
Lineage
Manuscript for submissions to Marine and Petroleum Geology
Parent Information
Extents
[-22.00, -16.00, 119.00, 128.00]
Reference System
Spatial Resolution
Service Information
Associations
Source Information