SEDIMENTOLOGY, GEOCHEMISTRY AND RESERVOIR POTENTIAL OF SANDSTONES IN THE SILURIAN AKKAS FORMATION, WESTERN IRAQ. / Al-Juboury, A. I.; Howard, J. P.; Nichols, G.; Vincent, S. J.; Manning, C.; Vautravers, B. P.

In: Journal of Petroleum Geology, Vol. 42, No. 3, 07.2019, p. 261-279.

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SEDIMENTOLOGY, GEOCHEMISTRY AND RESERVOIR POTENTIAL OF SANDSTONES IN THE SILURIAN AKKAS FORMATION, WESTERN IRAQ. / Al-Juboury, A. I.; Howard, J. P.; Nichols, G.; Vincent, S. J.; Manning, C.; Vautravers, B. P.

In: Journal of Petroleum Geology, Vol. 42, No. 3, 07.2019, p. 261-279.

Research output: Contribution to journalArticle

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Al-Juboury, A. I. ; Howard, J. P. ; Nichols, G. ; Vincent, S. J. ; Manning, C. ; Vautravers, B. P. / SEDIMENTOLOGY, GEOCHEMISTRY AND RESERVOIR POTENTIAL OF SANDSTONES IN THE SILURIAN AKKAS FORMATION, WESTERN IRAQ. In: Journal of Petroleum Geology. 2019 ; Vol. 42, No. 3. pp. 261-279.

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@article{7008e7e2be02434bb185e46b90badc06,
title = "SEDIMENTOLOGY, GEOCHEMISTRY AND RESERVOIR POTENTIAL OF SANDSTONES IN THE SILURIAN AKKAS FORMATION, WESTERN IRAQ",
abstract = "The source rock potential of “hot shales” in the Silurian Akkas Formation in Iraq has been investigated by numerous studies, but the reservoir potential of sandstone intervals in the formation has received less attention. This study investigates the sedimentology and geochemistry of sandstones from the Akkas Formation in the Akkas-1, Akkas-3 and KH5/6 wells in western Iraq. The composition of sandstone samples from the Akkas wells is similar; in general they are classified as sub-litharenites, quartz-arenites and sub-arkoses. Scanning electron microscopic analysis identified extensive microporosity and good pore connectivity, suggesting that these sandstones have the potential to form hydrocarbon reservoirs. The sandstones from the KH5/6 well are more lithic-rich than those from the Akkas wells and are classified as sub-litharenites. They have larger, more connected pores and better reservoir potential. Low permeability shale intervals within the Akkas Formation and the conformably-underlying Ordovician Khabour Formation form barriers to hydrocarbon migration into the Akkas and Khabour sandstones. Hydrocarbon migration from the Akkas “hot shales” in the Akkas field is therefore controlled by faulting and fracturing. Petrographic and whole rock geochemical analyses showed that the composition of sandstones in the Akkas Formation is different from that of sandstones in the Khabour Formation. The chemical alteration index ranges from 77.39 to 87.06%, indicating intense weathering of the provenance area before sandstone deposition. The studied samples are texturally mature which indicates good potential for fluid storage capacity. A decrease in feldspar content in the Akkas Formation is attributed to possible recycling of sediments from the Khabour Formation into the Akkas Formation following the Hirnantian glaciation, or to longer distance transportation from the source area.",
keywords = "Akkas field, Akkas Formation, geochemistry, Hirnantian glaciation, Iraq, Palaeozoic, petrography, reservoir potential, sandstone, Silurian",
author = "Al-Juboury, {A. I.} and Howard, {J. P.} and G. Nichols and Vincent, {S. J.} and C. Manning and Vautravers, {B. P.}",
year = "2019",
month = jul,
doi = "10.1111/jpg.12733",
language = "English",
volume = "42",
pages = "261--279",
journal = "Journal of Petroleum Geology",
issn = "0141-6421",
publisher = "Wiley-Blackwell",
number = "3",

}

RIS

TY - JOUR

T1 - SEDIMENTOLOGY, GEOCHEMISTRY AND RESERVOIR POTENTIAL OF SANDSTONES IN THE SILURIAN AKKAS FORMATION, WESTERN IRAQ

AU - Al-Juboury, A. I.

AU - Howard, J. P.

AU - Nichols, G.

AU - Vincent, S. J.

AU - Manning, C.

AU - Vautravers, B. P.

PY - 2019/7

Y1 - 2019/7

N2 - The source rock potential of “hot shales” in the Silurian Akkas Formation in Iraq has been investigated by numerous studies, but the reservoir potential of sandstone intervals in the formation has received less attention. This study investigates the sedimentology and geochemistry of sandstones from the Akkas Formation in the Akkas-1, Akkas-3 and KH5/6 wells in western Iraq. The composition of sandstone samples from the Akkas wells is similar; in general they are classified as sub-litharenites, quartz-arenites and sub-arkoses. Scanning electron microscopic analysis identified extensive microporosity and good pore connectivity, suggesting that these sandstones have the potential to form hydrocarbon reservoirs. The sandstones from the KH5/6 well are more lithic-rich than those from the Akkas wells and are classified as sub-litharenites. They have larger, more connected pores and better reservoir potential. Low permeability shale intervals within the Akkas Formation and the conformably-underlying Ordovician Khabour Formation form barriers to hydrocarbon migration into the Akkas and Khabour sandstones. Hydrocarbon migration from the Akkas “hot shales” in the Akkas field is therefore controlled by faulting and fracturing. Petrographic and whole rock geochemical analyses showed that the composition of sandstones in the Akkas Formation is different from that of sandstones in the Khabour Formation. The chemical alteration index ranges from 77.39 to 87.06%, indicating intense weathering of the provenance area before sandstone deposition. The studied samples are texturally mature which indicates good potential for fluid storage capacity. A decrease in feldspar content in the Akkas Formation is attributed to possible recycling of sediments from the Khabour Formation into the Akkas Formation following the Hirnantian glaciation, or to longer distance transportation from the source area.

AB - The source rock potential of “hot shales” in the Silurian Akkas Formation in Iraq has been investigated by numerous studies, but the reservoir potential of sandstone intervals in the formation has received less attention. This study investigates the sedimentology and geochemistry of sandstones from the Akkas Formation in the Akkas-1, Akkas-3 and KH5/6 wells in western Iraq. The composition of sandstone samples from the Akkas wells is similar; in general they are classified as sub-litharenites, quartz-arenites and sub-arkoses. Scanning electron microscopic analysis identified extensive microporosity and good pore connectivity, suggesting that these sandstones have the potential to form hydrocarbon reservoirs. The sandstones from the KH5/6 well are more lithic-rich than those from the Akkas wells and are classified as sub-litharenites. They have larger, more connected pores and better reservoir potential. Low permeability shale intervals within the Akkas Formation and the conformably-underlying Ordovician Khabour Formation form barriers to hydrocarbon migration into the Akkas and Khabour sandstones. Hydrocarbon migration from the Akkas “hot shales” in the Akkas field is therefore controlled by faulting and fracturing. Petrographic and whole rock geochemical analyses showed that the composition of sandstones in the Akkas Formation is different from that of sandstones in the Khabour Formation. The chemical alteration index ranges from 77.39 to 87.06%, indicating intense weathering of the provenance area before sandstone deposition. The studied samples are texturally mature which indicates good potential for fluid storage capacity. A decrease in feldspar content in the Akkas Formation is attributed to possible recycling of sediments from the Khabour Formation into the Akkas Formation following the Hirnantian glaciation, or to longer distance transportation from the source area.

KW - Akkas field

KW - Akkas Formation

KW - geochemistry

KW - Hirnantian glaciation

KW - Iraq

KW - Palaeozoic

KW - petrography

KW - reservoir potential

KW - sandstone

KW - Silurian

UR - http://www.scopus.com/inward/record.url?scp=85067079022&partnerID=8YFLogxK

U2 - 10.1111/jpg.12733

DO - 10.1111/jpg.12733

M3 - Article

AN - SCOPUS:85067079022

VL - 42

SP - 261

EP - 279

JO - Journal of Petroleum Geology

JF - Journal of Petroleum Geology

SN - 0141-6421

IS - 3

ER -