Authors / CoAuthors
Wang, L. | Bailey, A. | Grosjean, E. | Carson, C. | Carr, L. | Butcher, G. | Boreham, C. | Dewhurst, D. | Esteban, L. | Southby, C. | Henson, P.
Abstract
The Proterozoic succession in the NDI Carrara 1 drill hole, Northern Territory, consists predominantly of tight shales, siltstones, and calcareous clastic rocks. As part of Geoscience Australia’s Exploring for the Future program, this study aims to derive porosity, permeability and gas content from both laboratory testing and well log interpretation from machine learning approaches, to improve the Proterozoic shale gas reservoir characterisation. The Proterozoic Lawn Hill Formation was divided into four chemostratigraphic packages. The middle two packages were further divided into seven internal units according to principal component analysis and self-organising map clustering on well logs and inorganic geochemical properties. Artificial neural networks were then applied to interpret the mineral compositions, porosity and permeability from well logs, density and neutron-density crossplot interpretations. Gas content was estimated from the interpreted porosity, gas saturation, total organic carbon and clay contents. Petrophysical interpretation results are summarised for all chemostratigraphic packages and units. Package 2 (1116–1430.1 m) has the highest potential among the four chemostratigraphic packages. P2U1 (1116–1271 m) and P2U3 (1335.5–1430.1 m) units have the most favourable petrophysical properties for organic-rich shales with the average total gas contents of 1.25 cm3/g and 1.30 cm3/g, geometric mean permeability of 4.79 µD and 17.56 µD, and net shale thickness of 54.4 m and 85.3 m, respectively. P3U4 unit (687.9–697.9 m) has high gas content and permeability, with the net shale thickness of 29.1 m. Besides the organic-rich shales, the tight non-organic-rich siltstone and shale reservoirs in package 1 (below 1430.1 m) have average gas saturation of 14% and geometric mean permeability of 1.31 µD, respectively. Published in The APPEA Journal 2023. <b>Citation:</b> Wang Liuqi, Bailey Adam H. E., Grosjean Emmanuelle, Carson Chris, Carr Lidena K., Butcher Grace, Boreham Christopher J., Dewhurst Dave, Esteban Lionel, Southby Chris, Henson Paul A. (2023) Petrophysical interpretation and reservoir characterisation on Proterozoic shales in National Drilling Initiative Carrara 1, Northern Territory. <i>The APPEA Journal</i><b> 63</b>, 230-246. https://doi.org/10.1071/AJ22049
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document
eCat Id
147318
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
- ( Place )
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- NDI Carrara 1
- ( Theme )
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- Proterozoic shale
- ( Feature type )
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- porosity
- ( Feature type )
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- permeability
- ( Feature type )
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- gas content
- ( Discipline )
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- machine learning
- ( Discipline )
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- reservoir characterisation
- ( Project )
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- Exploring For The Future
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- Published_External
Publication Date
2023-06-22T02:29:11
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completed
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Submission to APPEA Journal 2023
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geoscientificInformation
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The APPEA Journal 63 (S1: Proceedings) 230-246
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This work is part of Exploring for the Future program. All the results have been integrated into a pdf document for The APPEA Journal.
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[-25.089, -19.8808, 134.628, 141.6548]
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