Microfacies and Diagenetic Processes of the Late Jurassic Naokelekan Formation in selected wells at Balad, Ajil and Baiji Oilfields, Central Iraq

H.Dohan, Ali; Kadhim, Lafta S.; Hassan, Faris N.

doi:10.25130/tjps.v27i4.36

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…Cementation, a signi cant diagenetic process, involves the lling of voids and porosities with calcite cement (Dohan et al, 2022). It takes place either during deposition, by lling interparticle pores, or subsequent to deposition, within fractures and joints due to the effects of compaction.…”

Section: Cementationmentioning

confidence: 99%

Microfacies and diagenesis of Setul Formation, Langkawi, Malaysia: Implications for the depositional environment

Rahman,

Teoh,

Abir

et al. 2024

Preprint

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The ongoing investigation into the microfacies and diagenesis of the Setul limestone reveals a considerable expanse of the formation that remains relatively unexplored. The comprehension of microfacies and diagenetic processes within sedimentary rocks holds paramount significance in predicting their viability as hydrocarbon reservoirs, decoding the geological history and depositional environment of a given region, reconstructing past climatic conditions, and understanding the fossil record. To meet the stipulated research objectives, which encompass the identification of microfacies and diagenesis within the Setul limestone, and the discourse on the diagenetic mechanisms operative within the limestone from the Gua Cherita outcrop, a multifaceted approach has been undertaken. This encompasses field observations, acid tests, thin section analyses, and X-ray Diffraction (XRD) analyses. The distinguished microfacies within the Setul limestone encompass packstone, wackestone, grainstone, and mudstone. Among the discerned minerals and grain constituents are dolomite, calcite, calcite veins, ooids, micrite, peloids, pellets, and vestiges of biota like ostracods and brachiopods. This variety of microfacies signifies a shallow marine depositional environment characterized by varying energy levels. Simultaneously, the diagenetic processes analysed in this study include dolomitization, cementation as well as compaction or stylolitization. The validity of this assertion is supported by the occurrence of dolomite, cemented grains, micrites, and the obvious presence of stylolitic structures observed in the samples. In essence, the prevailing expectation is that the results of this study will provide important and valuable insights for the geological community, with a specific emphasis on explaining the complex relationship between facies characteristics and the effectiveness of limestone reservoirs. Furthermore, this research is set to offer comprehensive insights into the physical properties of carbonate rocks, thereby establishing a strong basis to support future efforts within the realm of oil and gas exploration. The implications extend across both economic and industrial domains, highlighted by the inherent potential for the practical use of these findings.

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Section: Cementationmentioning

confidence: 99%

Microfacies and diagenesis of Setul Formation, Langkawi, Malaysia: Implications for the depositional environment

Rahman,

Teoh,

Abir

et al. 2024

Preprint

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Petrography and diagenesis of the Middle to Upper Jurassic succession from Sargelu section, northeastern Iraq

Rasool,

Ali,

Al-Juboury

2023

Al-Kitab J. Pure Sci.

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Petrographic and diagenetic analysis of the Middle-Upper Jurassic successions (Sargelu, Naokelekan, and Barsarin) formations and boundaries between them in the Sargelu area, Kurdistan region, N.E. Iraq was conducted based on the lithologic description, thin section analysis, and scanning electron microscopy. The study aims to define the petrographic components and diagenetic processes that affect the carbonate rocks of Jurassic succession in the studied section. Thirty-eight thin sections have been prepared, with five samples selected using the S.E.M. technique to reveal the petrographic components and diagenetic processes. The Jurassic succession is composed mainly of carbonates (limestone and dolostone) interbedded with shale units. Petrographically, the Sargelu, Naokelekan, and Barsarin formations are composed of skeletal grains (pelagic pelecypods, radiolaria, calcispheres, planktonic and benthonic foraminifera such as miliolid, ostracods, bioclasts, and stromatolites) which are the most common, in addition, non-skeletal grains such as poloids, micritic groundmass, and recrystallized micro spars, Many diagenetic processes affected the studied carbonate rocks such as micritization, dolomitization compaction and stylolite formation, authigenic minerals (pyrite), cementation, neomorphism, dissolution and porosity formation as represented by moldic, vuggy, channel and fracture porosity.

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Microfacies and Diagenetic Processes of the Late Jurassic Naokelekan Formation in selected wells at Balad, Ajil and Baiji Oilfields, Central Iraq

Cited by 2 publications

References 10 publications

Microfacies and diagenesis of Setul Formation, Langkawi, Malaysia: Implications for the depositional environment

Microfacies and diagenesis of Setul Formation, Langkawi, Malaysia: Implications for the depositional environment

Petrography and diagenesis of the Middle to Upper Jurassic succession from Sargelu section, northeastern Iraq

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