Influence of diagenetic features on petrophysical properties of fine-grained rocks of Oligocene strata in the Lower Indus Basin, Pakistan

Nari Formation is considered as one of the most important oil and gas exploration targets. These fine-grained tight sandstone reservoirs face enormous challenges due to their extremely low matrix porosity and permeability. Hence, in this regard, the study was carried out to collect the high-quality...

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Autores principales:	Shar Abdul Majeed, Mahesar Aftab Ahmed, Abbasi Ghazanfer Raza, Narejo Asad Ali, Hakro Asghar Ali Alias Daahar
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	tight sands diagenesis reservoir quality petrophysical properties nari formation lower indus basin pakistan Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/37a0b12211ab45d69527bd2983b1fb4b
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id	oai:doaj.org-article:37a0b12211ab45d69527bd2983b1fb4b
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spelling	oai:doaj.org-article:37a0b12211ab45d69527bd2983b1fb4b2021-12-05T14:10:48ZInfluence of diagenetic features on petrophysical properties of fine-grained rocks of Oligocene strata in the Lower Indus Basin, Pakistan2391-544710.1515/geo-2020-0250https://doaj.org/article/37a0b12211ab45d69527bd2983b1fb4b2021-05-01T00:00:00Zhttps://doi.org/10.1515/geo-2020-0250https://doaj.org/toc/2391-5447Nari Formation is considered as one of the most important oil and gas exploration targets. These fine-grained tight sandstone reservoirs face enormous challenges due to their extremely low matrix porosity and permeability. Hence, in this regard, the study was carried out to collect the high-quality data on petrophysical properties along with mineralogy and microstructural characteristics and diagenesis. The experiments performed includes the petrographic study and scanning electron microscopy, and X-ray diffraction analyses. Besides, the measurement of petrophysical properties was carried out to assess the likely influence of the reservoir quality. The petrographic analysis shows predominantly fine- to medium-grained grey samples along with calcite, clay, lithic fragments and iron oxides. Further, the thin-section observations revealed that the quartz is a principal mineral component in all the analysed samples ranging from 52.2 to 92.9%. The bulk volume of clay minerals that range from 5.3 to 16.1% of. The porosity and permeability measured range from 5.08 to 18.56% (average 7.22%) and from 0.0152 to 377 mD (average 0.25 mD), respectively. The main diagenetic processes that affected the sandstones of Nari Formation are mechanical compaction, grain deformation, cementation and quartz dissolution and have played a significant role in influencing the quality of the reservoir rock. Overall, it appears that the primary petrophysical properties (porosity and permeability) were decreased due to the mechanical compaction, lithification, cementation, and framework grain dissolution. Based on the integrated mineralogical, microstructural analysis, and the laboratory-based petrophysical properties, the samples exhibited poor porosity, permeability, and moderate clay content, which indicate that the Nari Formation is a poor quality reservoir.Shar Abdul MajeedMahesar Aftab AhmedAbbasi Ghazanfer RazaNarejo Asad AliHakro Asghar Ali Alias DaaharDe Gruyterarticletight sandsdiagenesisreservoir qualitypetrophysical propertiesnari formationlower indus basin pakistanGeologyQE1-996.5ENOpen Geosciences, Vol 13, Iss 1, Pp 517-531 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	tight sands diagenesis reservoir quality petrophysical properties nari formation lower indus basin pakistan Geology QE1-996.5
spellingShingle	tight sands diagenesis reservoir quality petrophysical properties nari formation lower indus basin pakistan Geology QE1-996.5 Shar Abdul Majeed Mahesar Aftab Ahmed Abbasi Ghazanfer Raza Narejo Asad Ali Hakro Asghar Ali Alias Daahar Influence of diagenetic features on petrophysical properties of fine-grained rocks of Oligocene strata in the Lower Indus Basin, Pakistan
description	Nari Formation is considered as one of the most important oil and gas exploration targets. These fine-grained tight sandstone reservoirs face enormous challenges due to their extremely low matrix porosity and permeability. Hence, in this regard, the study was carried out to collect the high-quality data on petrophysical properties along with mineralogy and microstructural characteristics and diagenesis. The experiments performed includes the petrographic study and scanning electron microscopy, and X-ray diffraction analyses. Besides, the measurement of petrophysical properties was carried out to assess the likely influence of the reservoir quality. The petrographic analysis shows predominantly fine- to medium-grained grey samples along with calcite, clay, lithic fragments and iron oxides. Further, the thin-section observations revealed that the quartz is a principal mineral component in all the analysed samples ranging from 52.2 to 92.9%. The bulk volume of clay minerals that range from 5.3 to 16.1% of. The porosity and permeability measured range from 5.08 to 18.56% (average 7.22%) and from 0.0152 to 377 mD (average 0.25 mD), respectively. The main diagenetic processes that affected the sandstones of Nari Formation are mechanical compaction, grain deformation, cementation and quartz dissolution and have played a significant role in influencing the quality of the reservoir rock. Overall, it appears that the primary petrophysical properties (porosity and permeability) were decreased due to the mechanical compaction, lithification, cementation, and framework grain dissolution. Based on the integrated mineralogical, microstructural analysis, and the laboratory-based petrophysical properties, the samples exhibited poor porosity, permeability, and moderate clay content, which indicate that the Nari Formation is a poor quality reservoir.
format	article
author	Shar Abdul Majeed Mahesar Aftab Ahmed Abbasi Ghazanfer Raza Narejo Asad Ali Hakro Asghar Ali Alias Daahar
author_facet	Shar Abdul Majeed Mahesar Aftab Ahmed Abbasi Ghazanfer Raza Narejo Asad Ali Hakro Asghar Ali Alias Daahar
author_sort	Shar Abdul Majeed
title	Influence of diagenetic features on petrophysical properties of fine-grained rocks of Oligocene strata in the Lower Indus Basin, Pakistan
title_short	Influence of diagenetic features on petrophysical properties of fine-grained rocks of Oligocene strata in the Lower Indus Basin, Pakistan
title_full	Influence of diagenetic features on petrophysical properties of fine-grained rocks of Oligocene strata in the Lower Indus Basin, Pakistan
title_fullStr	Influence of diagenetic features on petrophysical properties of fine-grained rocks of Oligocene strata in the Lower Indus Basin, Pakistan
title_full_unstemmed	Influence of diagenetic features on petrophysical properties of fine-grained rocks of Oligocene strata in the Lower Indus Basin, Pakistan
title_sort	influence of diagenetic features on petrophysical properties of fine-grained rocks of oligocene strata in the lower indus basin, pakistan
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/37a0b12211ab45d69527bd2983b1fb4b
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Influence of diagenetic features on petrophysical properties of fine-grained rocks of Oligocene strata in the Lower Indus Basin, Pakistan

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