A probability model to detect carbonate cementation in sandstones and other enigmatic wireline facies
Zones of carbonate cementation identified within lower Paaratte Formation sandstones of the eastern Otway Basin, Victoria, southeastern Australia, can be quantitatively detected by a wireline log-based probability model. Though trained on these zones, the same model appears to accurately predict car...
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ftunivadelaidedl:oai:digital.library.adelaide.edu.au:2440/126755 2023-12-17T10:28:43+01:00 A probability model to detect carbonate cementation in sandstones and other enigmatic wireline facies Bunch, M.A. 2020 http://hdl.handle.net/2440/126755 https://doi.org/10.1016/j.marpetgeo.2020.104424 en eng Elsevier Marine and Petroleum Geology, 2020; 118:104424-1-104424-24 0264-8172 1873-4073 http://hdl.handle.net/2440/126755 doi:10.1016/j.marpetgeo.2020.104424 Bunch, M.A. [0000-0002-7012-1217] © 2020 Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.marpetgeo.2020.104424 Siliciclastic succession carbonate cement wireline logging probability statistical modelling machine learning igneous intrusions Journal article 2020 ftunivadelaidedl https://doi.org/10.1016/j.marpetgeo.2020.104424 2023-11-20T23:15:39Z Zones of carbonate cementation identified within lower Paaratte Formation sandstones of the eastern Otway Basin, Victoria, southeastern Australia, can be quantitatively detected by a wireline log-based probability model. Though trained on these zones, the same model appears to accurately predict carbonate cementation within Late Cretaceous-to-Eocene reservoir sandstones of the Latrobe Group supersequence of the Gippsland Basin, 100s of km to the east. Predicted carbonate cementation matches published evidence (a regional petrographic study) and provides a plausible interpretation for corresponding sections of Formation Micro-Imager data acquired more recently. These Latrobe Group sandstones are thought to have once been pervasively cemented prior to development of the secondary porosity responsible for providing reservoirs to the main petroleum system of the basin. However, model predictions imply that discrete, heavily cemented zones remain, which must have acted, and must still act, as local obstructions to reservoir fluid migration. These zones would also likely react with carbonic acid formed at plume fronts generated by dedicated CO2 storage operations of the future. The cemented zones that have been predicted are sparse, spatially sporadic and cannot be resolved by 3D seismic reflection survey data at present-day reservoir depths. These predictions therefore emphasise the difficulty in mapping the distribution of carbonate cemented zones. However, they provide calibration data for future mapping systems. Two different tests of the probability log model were undertaken. One benchmarks its predictions against those of a neural network trained using the original model development dataset from the Otway Basin. Predictive performance of the neural network model is significantly worse than that of the probability log model when making predictions using wireline data acquired at a well in the Gippsland Basin. The second test demonstrates that the general probability log modelling approach is amenable to ... Article in Journal/Newspaper Carbonic acid The University of Adelaide: Digital Library Marine and Petroleum Geology 118 104424 |
institution |
Open Polar |
collection |
The University of Adelaide: Digital Library |
op_collection_id |
ftunivadelaidedl |
language |
English |
topic |
Siliciclastic succession carbonate cement wireline logging probability statistical modelling machine learning igneous intrusions |
spellingShingle |
Siliciclastic succession carbonate cement wireline logging probability statistical modelling machine learning igneous intrusions Bunch, M.A. A probability model to detect carbonate cementation in sandstones and other enigmatic wireline facies |
topic_facet |
Siliciclastic succession carbonate cement wireline logging probability statistical modelling machine learning igneous intrusions |
description |
Zones of carbonate cementation identified within lower Paaratte Formation sandstones of the eastern Otway Basin, Victoria, southeastern Australia, can be quantitatively detected by a wireline log-based probability model. Though trained on these zones, the same model appears to accurately predict carbonate cementation within Late Cretaceous-to-Eocene reservoir sandstones of the Latrobe Group supersequence of the Gippsland Basin, 100s of km to the east. Predicted carbonate cementation matches published evidence (a regional petrographic study) and provides a plausible interpretation for corresponding sections of Formation Micro-Imager data acquired more recently. These Latrobe Group sandstones are thought to have once been pervasively cemented prior to development of the secondary porosity responsible for providing reservoirs to the main petroleum system of the basin. However, model predictions imply that discrete, heavily cemented zones remain, which must have acted, and must still act, as local obstructions to reservoir fluid migration. These zones would also likely react with carbonic acid formed at plume fronts generated by dedicated CO2 storage operations of the future. The cemented zones that have been predicted are sparse, spatially sporadic and cannot be resolved by 3D seismic reflection survey data at present-day reservoir depths. These predictions therefore emphasise the difficulty in mapping the distribution of carbonate cemented zones. However, they provide calibration data for future mapping systems. Two different tests of the probability log model were undertaken. One benchmarks its predictions against those of a neural network trained using the original model development dataset from the Otway Basin. Predictive performance of the neural network model is significantly worse than that of the probability log model when making predictions using wireline data acquired at a well in the Gippsland Basin. The second test demonstrates that the general probability log modelling approach is amenable to ... |
format |
Article in Journal/Newspaper |
author |
Bunch, M.A. |
author_facet |
Bunch, M.A. |
author_sort |
Bunch, M.A. |
title |
A probability model to detect carbonate cementation in sandstones and other enigmatic wireline facies |
title_short |
A probability model to detect carbonate cementation in sandstones and other enigmatic wireline facies |
title_full |
A probability model to detect carbonate cementation in sandstones and other enigmatic wireline facies |
title_fullStr |
A probability model to detect carbonate cementation in sandstones and other enigmatic wireline facies |
title_full_unstemmed |
A probability model to detect carbonate cementation in sandstones and other enigmatic wireline facies |
title_sort |
probability model to detect carbonate cementation in sandstones and other enigmatic wireline facies |
publisher |
Elsevier |
publishDate |
2020 |
url |
http://hdl.handle.net/2440/126755 https://doi.org/10.1016/j.marpetgeo.2020.104424 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
http://dx.doi.org/10.1016/j.marpetgeo.2020.104424 |
op_relation |
Marine and Petroleum Geology, 2020; 118:104424-1-104424-24 0264-8172 1873-4073 http://hdl.handle.net/2440/126755 doi:10.1016/j.marpetgeo.2020.104424 Bunch, M.A. [0000-0002-7012-1217] |
op_rights |
© 2020 Elsevier Ltd. All rights reserved. |
op_doi |
https://doi.org/10.1016/j.marpetgeo.2020.104424 |
container_title |
Marine and Petroleum Geology |
container_volume |
118 |
container_start_page |
104424 |
_version_ |
1785580901186404352 |