Lithofacies and Sequence stratigraphic Framework of the Kockatea Shale, Dandaragan Trough, Perth Basin
Initial studies affirm large-scale shale-gas potential for the Permo-Triassic intervals of the Perth Basin. The Dandaragan Trough, as a major depocentre in the basin and with the highest number of wells intersecting these intervals, has possibly the greatest shale-gas potential in the area. The prim...
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| Format: | Journal Article |
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Australian Petroleum Production and Exploration Association
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/18946 |
| _version_ | 1848749893162631168 |
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| author | Jafary Dargahi, H. Rezaee, M. Reza |
| author_facet | Jafary Dargahi, H. Rezaee, M. Reza |
| author_sort | Jafary Dargahi, H. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Initial studies affirm large-scale shale-gas potential for the Permo-Triassic intervals of the Perth Basin. The Dandaragan Trough, as a major depocentre in the basin and with the highest number of wells intersecting these intervals, has possibly the greatest shale-gas potential in the area. The primary self-contained shale-gas system proposed for the Dandaragan Trough is in the basal Kockatea Shale (Hovea Member), which was deposited during the Late Permian-Early Triassic. Seven lithofacies have been identified in a continuous 35 m core from the Hovea Member of the Kockatea Shale at Redback–2. Among recognised lithofacies, besides siliceous mudstone, which contains clastic particles, most are representative of deposition in a shallow marine environment with different energy levels. Bioturbated lithofacies reveal deposition in a higher-energy environment compared with the other lithofacies. The sequence stratigraphic framework of the Hovea Member is established based on diagnosis of the lithofacies, cyclical stacking patterns, transgressive surfaces of erosion (TSE), and condensed sections (CSs). The framework supports deposition mainly in an aqueous environment with rare regressions. Periodic tectonic activity can be revealed in high-frequency relative sea-level changes during Hovea Member deposition. Gamma ray (GR) log analysis indicates that the highest GR peak is related to black-shale lithofacies with 1.75% TOC content. The greatest amounts of TOC, however, exist in the fossiliferous mudstone and pyritic mudstone lithofacies. A north–south GR correlation of the Hovea Member shows nearly the same lithological distribution throughout the trough despite its thinning in various areas. |
| first_indexed | 2025-11-14T07:28:10Z |
| format | Journal Article |
| id | curtin-20.500.11937-18946 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:28:10Z |
| publishDate | 2013 |
| publisher | Australian Petroleum Production and Exploration Association |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-189462017-01-30T12:10:57Z Lithofacies and Sequence stratigraphic Framework of the Kockatea Shale, Dandaragan Trough, Perth Basin Jafary Dargahi, H. Rezaee, M. Reza scanning electron microscopy (SEM) shale gas transgressive surface of erosion fossiliferous mudstone Kockatea Shale gamma-ray patterns black shale strata stacking patterns pyritic mudstone transgression event (TR) Early Triassic interval depositional environment heterogeneity stratigraphic framework sequence boundary calcareous mudstone relative sea-level changes Dandaragan Trough core sample total organic carbon (TOC) lithofacies thin-section petrography Hovea Member siliceous mudstone siliceous calcareous mudstone lithological variation bioturbated mudstone condensed section gamma-ray parasequences regression event (RE) Initial studies affirm large-scale shale-gas potential for the Permo-Triassic intervals of the Perth Basin. The Dandaragan Trough, as a major depocentre in the basin and with the highest number of wells intersecting these intervals, has possibly the greatest shale-gas potential in the area. The primary self-contained shale-gas system proposed for the Dandaragan Trough is in the basal Kockatea Shale (Hovea Member), which was deposited during the Late Permian-Early Triassic. Seven lithofacies have been identified in a continuous 35 m core from the Hovea Member of the Kockatea Shale at Redback–2. Among recognised lithofacies, besides siliceous mudstone, which contains clastic particles, most are representative of deposition in a shallow marine environment with different energy levels. Bioturbated lithofacies reveal deposition in a higher-energy environment compared with the other lithofacies. The sequence stratigraphic framework of the Hovea Member is established based on diagnosis of the lithofacies, cyclical stacking patterns, transgressive surfaces of erosion (TSE), and condensed sections (CSs). The framework supports deposition mainly in an aqueous environment with rare regressions. Periodic tectonic activity can be revealed in high-frequency relative sea-level changes during Hovea Member deposition. Gamma ray (GR) log analysis indicates that the highest GR peak is related to black-shale lithofacies with 1.75% TOC content. The greatest amounts of TOC, however, exist in the fossiliferous mudstone and pyritic mudstone lithofacies. A north–south GR correlation of the Hovea Member shows nearly the same lithological distribution throughout the trough despite its thinning in various areas. 2013 Journal Article http://hdl.handle.net/20.500.11937/18946 Australian Petroleum Production and Exploration Association fulltext |
| spellingShingle | scanning electron microscopy (SEM) shale gas transgressive surface of erosion fossiliferous mudstone Kockatea Shale gamma-ray patterns black shale strata stacking patterns pyritic mudstone transgression event (TR) Early Triassic interval depositional environment heterogeneity stratigraphic framework sequence boundary calcareous mudstone relative sea-level changes Dandaragan Trough core sample total organic carbon (TOC) lithofacies thin-section petrography Hovea Member siliceous mudstone siliceous calcareous mudstone lithological variation bioturbated mudstone condensed section gamma-ray parasequences regression event (RE) Jafary Dargahi, H. Rezaee, M. Reza Lithofacies and Sequence stratigraphic Framework of the Kockatea Shale, Dandaragan Trough, Perth Basin |
| title | Lithofacies and Sequence stratigraphic Framework of the Kockatea Shale, Dandaragan Trough, Perth Basin |
| title_full | Lithofacies and Sequence stratigraphic Framework of the Kockatea Shale, Dandaragan Trough, Perth Basin |
| title_fullStr | Lithofacies and Sequence stratigraphic Framework of the Kockatea Shale, Dandaragan Trough, Perth Basin |
| title_full_unstemmed | Lithofacies and Sequence stratigraphic Framework of the Kockatea Shale, Dandaragan Trough, Perth Basin |
| title_short | Lithofacies and Sequence stratigraphic Framework of the Kockatea Shale, Dandaragan Trough, Perth Basin |
| title_sort | lithofacies and sequence stratigraphic framework of the kockatea shale, dandaragan trough, perth basin |
| topic | scanning electron microscopy (SEM) shale gas transgressive surface of erosion fossiliferous mudstone Kockatea Shale gamma-ray patterns black shale strata stacking patterns pyritic mudstone transgression event (TR) Early Triassic interval depositional environment heterogeneity stratigraphic framework sequence boundary calcareous mudstone relative sea-level changes Dandaragan Trough core sample total organic carbon (TOC) lithofacies thin-section petrography Hovea Member siliceous mudstone siliceous calcareous mudstone lithological variation bioturbated mudstone condensed section gamma-ray parasequences regression event (RE) |
| url | http://hdl.handle.net/20.500.11937/18946 |