Organic geochemistry and petroleum potential of Permian outcrop and core samples from the southern Sydney Basin

Simon C. George, Shirin Baydjanova, Bronwyn C. Campbell, Brave Manda

Research output: Contribution to journalConference paperResearch

Abstract

Permian sediments occur throughout the southern Sydney Basin, exposed on the coastline south of Wollongong, and penetrated by various boreholes. This study uses outcrop samples and samples from three boreholes held by NSW Resources and Energy at the core library at Londonderry (Department of Mines Callala DDH1 [Callala-1] from near Callala Bay, Elecom Clyde River DDH07 [ECR-7] from near Nowra, and Elecom Clyde River DDH01 [ECR-1] from near Wingello). Formations analysed include the Berry Siltstone, Nowra Sandstone, Wandrawandian Siltstone, the Snapper Point Formation, the Pebbley Beach Formation and the Yarrunga Coal Measures. The objectives are to determine the depositional environment, organic matter inputs, thermal maturity and petroleum generation potential of these formations, which were deposited when Australia was close to the South Pole. The rocks at outcrop and in ECR-1 are in the early oil window, while rocks from near Jervis Bay (Callala-1, ECR-7) are in the gas window. Total organic carbon content is heterogeneous and varies from 0.2–6.7%. The rocks were deposited in oxic to suboxic depositional environments. The Wandrawandian Siltstone contains biomarkers dominated by very high amounts of diahopanes and diasteranes, whereas these biomarkers are of lower relative abundance in the other formations. This is suggestive of a clay-rich sediment in an oxic, acid-catalysed depositional environment, with enhanced diagenetic alteration of the biomarkers, or alternatively an unusual organic input. The Pebbley Beach and Snapper Point formations are characterised by biomarker distributions dominated by terrigenously sourced terpanes (e.g. C24 tetracyclic terpane and C19 tricyclic terpane), corroborating their deltaic and shallow marine depositional environments, respectively. In contrast, the Wandrawandian Siltstone contains dominantly C21, C23, and C24 tricyclic terpanes. The Pebbley Beach Formation contains high amounts of C29 relative to C28 and C27 steranes, also consistent with a dominant terrigenous input.
LanguageEnglish
Pages1-5
Number of pages5
JournalASEG Extended Abstracts
Volume2018
Issue number1
DOIs
Publication statusPublished - 2018
EventAustralasian Exploration Geoscience Conference (1st : 2018) - Sydney, Australia
Duration: 18 Feb 201821 Feb 2018

Fingerprint

organic geochemistry
siltstone
depositional environment
biomarker
Permian
outcrop
petroleum
beach
basin
river
borehole
rock
thermal maturity
Coal Measures
sediment
total organic carbon
marine environment
relative abundance
sandstone
organic matter

Keywords

  • Biomarkers
  • Permian
  • Sydney Basin
  • depositional environment
  • maturity

Cite this

@article{49544bf72fb24120be81d1a73313e87d,
title = "Organic geochemistry and petroleum potential of Permian outcrop and core samples from the southern Sydney Basin",
abstract = "Permian sediments occur throughout the southern Sydney Basin, exposed on the coastline south of Wollongong, and penetrated by various boreholes. This study uses outcrop samples and samples from three boreholes held by NSW Resources and Energy at the core library at Londonderry (Department of Mines Callala DDH1 [Callala-1] from near Callala Bay, Elecom Clyde River DDH07 [ECR-7] from near Nowra, and Elecom Clyde River DDH01 [ECR-1] from near Wingello). Formations analysed include the Berry Siltstone, Nowra Sandstone, Wandrawandian Siltstone, the Snapper Point Formation, the Pebbley Beach Formation and the Yarrunga Coal Measures. The objectives are to determine the depositional environment, organic matter inputs, thermal maturity and petroleum generation potential of these formations, which were deposited when Australia was close to the South Pole. The rocks at outcrop and in ECR-1 are in the early oil window, while rocks from near Jervis Bay (Callala-1, ECR-7) are in the gas window. Total organic carbon content is heterogeneous and varies from 0.2–6.7{\%}. The rocks were deposited in oxic to suboxic depositional environments. The Wandrawandian Siltstone contains biomarkers dominated by very high amounts of diahopanes and diasteranes, whereas these biomarkers are of lower relative abundance in the other formations. This is suggestive of a clay-rich sediment in an oxic, acid-catalysed depositional environment, with enhanced diagenetic alteration of the biomarkers, or alternatively an unusual organic input. The Pebbley Beach and Snapper Point formations are characterised by biomarker distributions dominated by terrigenously sourced terpanes (e.g. C24 tetracyclic terpane and C19 tricyclic terpane), corroborating their deltaic and shallow marine depositional environments, respectively. In contrast, the Wandrawandian Siltstone contains dominantly C21, C23, and C24 tricyclic terpanes. The Pebbley Beach Formation contains high amounts of C29 relative to C28 and C27 steranes, also consistent with a dominant terrigenous input.",
keywords = "Biomarkers, Permian, Sydney Basin, depositional environment, maturity",
author = "George, {Simon C.} and Shirin Baydjanova and Campbell, {Bronwyn C.} and Brave Manda",
year = "2018",
doi = "10.1071/ASEG2018abM1_4C",
language = "English",
volume = "2018",
pages = "1--5",
journal = "ASEG Extended Abstracts",
issn = "2202-0586",
publisher = "CSIRO Publishing",
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}

Organic geochemistry and petroleum potential of Permian outcrop and core samples from the southern Sydney Basin. / George, Simon C.; Baydjanova, Shirin; Campbell, Bronwyn C.; Manda, Brave.

In: ASEG Extended Abstracts, Vol. 2018, No. 1, 2018, p. 1-5.

Research output: Contribution to journalConference paperResearch

TY - JOUR

T1 - Organic geochemistry and petroleum potential of Permian outcrop and core samples from the southern Sydney Basin

AU - George, Simon C.

AU - Baydjanova, Shirin

AU - Campbell, Bronwyn C.

AU - Manda, Brave

PY - 2018

Y1 - 2018

N2 - Permian sediments occur throughout the southern Sydney Basin, exposed on the coastline south of Wollongong, and penetrated by various boreholes. This study uses outcrop samples and samples from three boreholes held by NSW Resources and Energy at the core library at Londonderry (Department of Mines Callala DDH1 [Callala-1] from near Callala Bay, Elecom Clyde River DDH07 [ECR-7] from near Nowra, and Elecom Clyde River DDH01 [ECR-1] from near Wingello). Formations analysed include the Berry Siltstone, Nowra Sandstone, Wandrawandian Siltstone, the Snapper Point Formation, the Pebbley Beach Formation and the Yarrunga Coal Measures. The objectives are to determine the depositional environment, organic matter inputs, thermal maturity and petroleum generation potential of these formations, which were deposited when Australia was close to the South Pole. The rocks at outcrop and in ECR-1 are in the early oil window, while rocks from near Jervis Bay (Callala-1, ECR-7) are in the gas window. Total organic carbon content is heterogeneous and varies from 0.2–6.7%. The rocks were deposited in oxic to suboxic depositional environments. The Wandrawandian Siltstone contains biomarkers dominated by very high amounts of diahopanes and diasteranes, whereas these biomarkers are of lower relative abundance in the other formations. This is suggestive of a clay-rich sediment in an oxic, acid-catalysed depositional environment, with enhanced diagenetic alteration of the biomarkers, or alternatively an unusual organic input. The Pebbley Beach and Snapper Point formations are characterised by biomarker distributions dominated by terrigenously sourced terpanes (e.g. C24 tetracyclic terpane and C19 tricyclic terpane), corroborating their deltaic and shallow marine depositional environments, respectively. In contrast, the Wandrawandian Siltstone contains dominantly C21, C23, and C24 tricyclic terpanes. The Pebbley Beach Formation contains high amounts of C29 relative to C28 and C27 steranes, also consistent with a dominant terrigenous input.

AB - Permian sediments occur throughout the southern Sydney Basin, exposed on the coastline south of Wollongong, and penetrated by various boreholes. This study uses outcrop samples and samples from three boreholes held by NSW Resources and Energy at the core library at Londonderry (Department of Mines Callala DDH1 [Callala-1] from near Callala Bay, Elecom Clyde River DDH07 [ECR-7] from near Nowra, and Elecom Clyde River DDH01 [ECR-1] from near Wingello). Formations analysed include the Berry Siltstone, Nowra Sandstone, Wandrawandian Siltstone, the Snapper Point Formation, the Pebbley Beach Formation and the Yarrunga Coal Measures. The objectives are to determine the depositional environment, organic matter inputs, thermal maturity and petroleum generation potential of these formations, which were deposited when Australia was close to the South Pole. The rocks at outcrop and in ECR-1 are in the early oil window, while rocks from near Jervis Bay (Callala-1, ECR-7) are in the gas window. Total organic carbon content is heterogeneous and varies from 0.2–6.7%. The rocks were deposited in oxic to suboxic depositional environments. The Wandrawandian Siltstone contains biomarkers dominated by very high amounts of diahopanes and diasteranes, whereas these biomarkers are of lower relative abundance in the other formations. This is suggestive of a clay-rich sediment in an oxic, acid-catalysed depositional environment, with enhanced diagenetic alteration of the biomarkers, or alternatively an unusual organic input. The Pebbley Beach and Snapper Point formations are characterised by biomarker distributions dominated by terrigenously sourced terpanes (e.g. C24 tetracyclic terpane and C19 tricyclic terpane), corroborating their deltaic and shallow marine depositional environments, respectively. In contrast, the Wandrawandian Siltstone contains dominantly C21, C23, and C24 tricyclic terpanes. The Pebbley Beach Formation contains high amounts of C29 relative to C28 and C27 steranes, also consistent with a dominant terrigenous input.

KW - Biomarkers

KW - Permian

KW - Sydney Basin

KW - depositional environment

KW - maturity

U2 - 10.1071/ASEG2018abM1_4C

DO - 10.1071/ASEG2018abM1_4C

M3 - Conference paper

VL - 2018

SP - 1

EP - 5

JO - ASEG Extended Abstracts

T2 - ASEG Extended Abstracts

JF - ASEG Extended Abstracts

SN - 2202-0586

IS - 1

ER -