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Impact of thermal maturation of the upper cretaceous bituminous limestone of Attarat Um Ghudran central Jordan on calcareous nannofossil preservation

Oil shale deposits of the Late Cretaceous from three boreholes in central Jordan were examined to assess the impact of thermal maturation on the content of nannofossils. Thermal activity has been shown to have a strong effect on organic matter content and composition but its effect on calcareous nan...

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Main Authors: Alqudah, Mohammad, Al Alaween, Mohammad, Fermor, Adam, Ali, Ezaldeen, Wagner, Thomas, Alhakimi, Mohammed Hail, Rahim, Afikah
Format: Article
Language:English
Published: American Chemical Society 2023
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://eprints.utm.my/104868/1/AfikahRahim2023_ImpactofThermalMaturationoftheUpperCretaceous.pdf
http://eprints.utm.my/104868/
http://dx.doi.org/10.1021/acsomega.3c06033
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spelling my.utm.1048682024-03-25T09:08:50Z http://eprints.utm.my/104868/ Impact of thermal maturation of the upper cretaceous bituminous limestone of Attarat Um Ghudran central Jordan on calcareous nannofossil preservation Alqudah, Mohammad Al Alaween, Mohammad Fermor, Adam Ali, Ezaldeen Wagner, Thomas Alhakimi, Mohammed Hail Rahim, Afikah TA Engineering (General). Civil engineering (General) Oil shale deposits of the Late Cretaceous from three boreholes in central Jordan were examined to assess the impact of thermal maturation on the content of nannofossils. Thermal activity has been shown to have a strong effect on organic matter content and composition but its effect on calcareous nannofossil assemblages remains inconclusive. This study aims to determine the impact of thermal maturation on nannofossil assemblages and to compare this to an estimated maturity level based on bulk geochemical analysis. Micropaleontological and geochemical analyses were conducted on 31 samples from three oil shale wells drilled in Attarat Um Ghudran central Jordan. Several types of nannofossil preservation have been recorded, including dissolution, overgrowth, and breakage. In the Jordan oil shale sections, nannofossils exhibit a variety of preservation types, with intense dissolution in the middle part of the study sections. The vast majority of the samples had high TOC enrichment, with 29 samples exceeding values of >10%. Kerogen recovery and quality from the oil shale are very good, with a predominance of fluorescent amorphous organic matter (AOM) and minor algal components. The low fluorescence preservation index (FPI), which is 1 in most of the samples, indicates that alteration occurred due to intense thermal activities in the study interval. The palynomorph and AOM fluorescence, ranging from a spore coloration index (SCI) of 3 to 5, suggest that the studied samples were approaching the oil window. A correlation between the nannofossil preservation and geochemical parameters shows a predominance of poorly preserved nannofossils along with high total organic carbon contents and an elevated hydrogen index (HI). We show that low FPI values and a higher level of maturity are associated with poor nannofossil preservation, suggesting that nannofossils, in conjunction with petrographic analysis of kerogen, could be used as a rapid screening technique for estimating levels of oil-shale maturity. The nature of the tectonism in the study area, including faulting and a metamorphosed zone, enhanced the maturity, which might explain why the nannofossils were so significantly affected. American Chemical Society 2023 Article PeerReviewed application/pdf en http://eprints.utm.my/104868/1/AfikahRahim2023_ImpactofThermalMaturationoftheUpperCretaceous.pdf Alqudah, Mohammad and Al Alaween, Mohammad and Fermor, Adam and Ali, Ezaldeen and Wagner, Thomas and Alhakimi, Mohammed Hail and Rahim, Afikah (2023) Impact of thermal maturation of the upper cretaceous bituminous limestone of Attarat Um Ghudran central Jordan on calcareous nannofossil preservation. ACS Omega, 8 (42). pp. 39830-39846. ISSN 2470-1343 http://dx.doi.org/10.1021/acsomega.3c06033 DOI : 10.1021/acsomega.3c06033
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Alqudah, Mohammad
Al Alaween, Mohammad
Fermor, Adam
Ali, Ezaldeen
Wagner, Thomas
Alhakimi, Mohammed Hail
Rahim, Afikah
Impact of thermal maturation of the upper cretaceous bituminous limestone of Attarat Um Ghudran central Jordan on calcareous nannofossil preservation
description Oil shale deposits of the Late Cretaceous from three boreholes in central Jordan were examined to assess the impact of thermal maturation on the content of nannofossils. Thermal activity has been shown to have a strong effect on organic matter content and composition but its effect on calcareous nannofossil assemblages remains inconclusive. This study aims to determine the impact of thermal maturation on nannofossil assemblages and to compare this to an estimated maturity level based on bulk geochemical analysis. Micropaleontological and geochemical analyses were conducted on 31 samples from three oil shale wells drilled in Attarat Um Ghudran central Jordan. Several types of nannofossil preservation have been recorded, including dissolution, overgrowth, and breakage. In the Jordan oil shale sections, nannofossils exhibit a variety of preservation types, with intense dissolution in the middle part of the study sections. The vast majority of the samples had high TOC enrichment, with 29 samples exceeding values of >10%. Kerogen recovery and quality from the oil shale are very good, with a predominance of fluorescent amorphous organic matter (AOM) and minor algal components. The low fluorescence preservation index (FPI), which is 1 in most of the samples, indicates that alteration occurred due to intense thermal activities in the study interval. The palynomorph and AOM fluorescence, ranging from a spore coloration index (SCI) of 3 to 5, suggest that the studied samples were approaching the oil window. A correlation between the nannofossil preservation and geochemical parameters shows a predominance of poorly preserved nannofossils along with high total organic carbon contents and an elevated hydrogen index (HI). We show that low FPI values and a higher level of maturity are associated with poor nannofossil preservation, suggesting that nannofossils, in conjunction with petrographic analysis of kerogen, could be used as a rapid screening technique for estimating levels of oil-shale maturity. The nature of the tectonism in the study area, including faulting and a metamorphosed zone, enhanced the maturity, which might explain why the nannofossils were so significantly affected.
format Article
author Alqudah, Mohammad
Al Alaween, Mohammad
Fermor, Adam
Ali, Ezaldeen
Wagner, Thomas
Alhakimi, Mohammed Hail
Rahim, Afikah
author_facet Alqudah, Mohammad
Al Alaween, Mohammad
Fermor, Adam
Ali, Ezaldeen
Wagner, Thomas
Alhakimi, Mohammed Hail
Rahim, Afikah
author_sort Alqudah, Mohammad
title Impact of thermal maturation of the upper cretaceous bituminous limestone of Attarat Um Ghudran central Jordan on calcareous nannofossil preservation
title_short Impact of thermal maturation of the upper cretaceous bituminous limestone of Attarat Um Ghudran central Jordan on calcareous nannofossil preservation
title_full Impact of thermal maturation of the upper cretaceous bituminous limestone of Attarat Um Ghudran central Jordan on calcareous nannofossil preservation
title_fullStr Impact of thermal maturation of the upper cretaceous bituminous limestone of Attarat Um Ghudran central Jordan on calcareous nannofossil preservation
title_full_unstemmed Impact of thermal maturation of the upper cretaceous bituminous limestone of Attarat Um Ghudran central Jordan on calcareous nannofossil preservation
title_sort impact of thermal maturation of the upper cretaceous bituminous limestone of attarat um ghudran central jordan on calcareous nannofossil preservation
publisher American Chemical Society
publishDate 2023
url http://eprints.utm.my/104868/1/AfikahRahim2023_ImpactofThermalMaturationoftheUpperCretaceous.pdf
http://eprints.utm.my/104868/
http://dx.doi.org/10.1021/acsomega.3c06033
_version_ 1794545940488519680
score 13.211869

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