Chemostratigraphy of the Upper Cretaceous-Paleogene organic-rich succession on the southern Tethys margin in Egypt

Abu-Ali, Rania; El-Kammar, Ahmed; Kuss, Jochen

doi:10.1016/j.jafrearsci.2020.103779

Cited by 6 publications

(5 citation statements)

References 35 publications

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“…1 and 2 are composed mainly of thin laminae that vary between shale and fine silt with calcareous cement (Figure 11 (1-10) and Figure 12 (1,2). The organic matter is concentrated mainly in the shale laminae and is represented by alginite (41%) that is distinguished by its brown color in white light and bright yellow color in fluorescence mode (Figure 11 (1)(2)(3)6,7,11,12). The alginite extends in large sheets (<5 µm in thickness) parallel to the bedding plane (Figure 11 (1-3,6,7)).…”

Section: Organic Petrography and Microscopic Composition Of Organic Mattermentioning

confidence: 99%

“…The rapid growth of urban regions and industrial demand has led to a greater consumption of conventional petroleum resources., which has resulted in the decline in conventional petroleum reserves [1]. The decline in petroleum has led to the search for unconventional resources based on fossil energy (e.g., oil shale, shale oil, shale gas) and non-fossil energy (e.g., wind energy and sun power).…”

Section: Introductionmentioning

confidence: 99%

“…In Egypt, the above time interval is economically important as it contains the main episodes that led to the formation of the black shale and phosphorites of the Duwi Formation [4]. Phosphatic accumulations are associated with organic-rich strata and cherts, and indicate high productive surface waters [1,4]. The province holds the greatest accumulation of phosphorites in geological history, possibly in excess of 70 billion metric tons; the phosphate resources in Egypt alone exceed 3 billion metric tons [5].…”

Section: Introductionmentioning

confidence: 99%

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Organic Petrographic and Geochemical Evaluation of the Black Shale of the Duwi Formation, El Sebaiya, Nile Valley, Egypt

et al. 2021

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This study evaluates the palynologic, organic, inorganic, and petrographic properties of organic-rich black shale (Mahamid Mine) in the El Sebaiya area, Nile Valley, Egypt. Black shale is composed of quartz (50%), calcite (10%), kaolinite (25%) and montmorillonite (15%). Organic and inorganic analyses revealed that this shale was deposited under oxic to anoxic marine conditions during strong chemical weathering. Black shale has poor to very good organic richness, and poor to fair hydrocarbon potential. Organic petrography indicates that the kerogen is mixed types II/III and III and is immature to marginally mature (%VRo is 0.44 and 0.53). Liptinite macerals consist of alginite, cutinite, and bituminite. The hydrocarbon products to be generated at higher maturity are expected to be oil and gas.

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Section: Organic Petrography and Microscopic Composition Of Organic Mattermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Organic Petrographic and Geochemical Evaluation of the Black Shale of the Duwi Formation, El Sebaiya, Nile Valley, Egypt

et al. 2021

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“…For these reasons, chemostratigraphy has become one of the most preferable stratigraphic division methods for mudstone successions [18]. Besides, the multivariate-statistically based chemostratigraphic technique is a new trend that can provide more objective and quantitative results [4,10,20,21].…”

Section: Introductionmentioning

confidence: 99%

Chemostratigraphic Analysis of Wufeng and Longmaxi Formation in Changning, Sichuan, China: Achieved by Principal Component and Constrained Clustering Analysis

et al. 2021

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The increasing proportion of unconventional worldwide energy demands have consistently promoted the necessity for exploring a precise, high-resolution, objective, and quantitative stratigraphic division method for macroscopically homogeneous mudstone successions. The chemostratigraphy can resolve this problem well, although it has been applied successfully in North America, but not systematically studied in China for shale gas exploration and development. This work has conducted a chemostratigraphic analysis of Wufeng and Longmaxi Formation on the Changning section of Sichuan Province, southwestern China, to testify its applicability for shale gas exploration in China. Principal component analysis (PCA) was first employed to reduce the dimensionality of datasets. Three chemofacies, including detrital (K, Ti, Fe, Al, Na, Mg, Cr, Zr, Rb), authigenic (Ca, Sr, Mn, Si, S, Ba), and redox-organic (P, V, Ni, Zn, Cu, TOC), were found. Subsequently, constrained clustering analysis was utilized for the zonation of each chemofacies into chemozones. Consequently, the whole Changning section was divided into twelve chemozones (CZ I–CZ Ⅻ). The geochemical interpretation for these chemozones can be resolved from the regional changes in paleogeography and paleoceanography during the Late Ordovician to Early Silurian period. Thus, a three-stage geochemical evolution along the Changning section can be classified: (1) the siliceous and anoxic deposits of Wufeng Formation (CZ I–CZ III) with high TOC contents; (2) the siliceous and anoxic sedimentary rocks of bottom Longmaxi Formation with still higher TOC (CZ Ⅳ); (3) the calcarous-detrital and oxic sediments for the rest of Longmaxi Formation (CZ Ⅴ–CZ Ⅻ). In considering their high content of TOC and abundant brittle siliceous minerals, the CZ (I–Ⅳ, 0 m–33.6 m) are thought to be the most preferable sweet spot for shale gas exploration.

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“…Numerous studies on geology, micropalaeontology, sedimentology, microfacies analysis, and stratigraphy on the Upper Cretaceous–Lower Palaeogene successions have been carried out on the Quseir‐Safaga district. These include Said (1962), Issawi, Francis, El Hinnawi, Mehanna, and El Deftar (1971), Hewaidy (1979), Hewaidy and Faris (1989), Salama, El‐Kammar, Saunder, Morsy, and Kong (2015), Aly (2017), Soliman, Obaidalla, Metwally, and Mohamed (2018), Abu‐Ali, El‐Kammar, Zakaria, El‐Shafeiy, and Kuss (2019) and recently Abu‐Ali, El‐Kammara, and Kuss (2020).…”

Section: Introductionmentioning

confidence: 99%

Biostratigraphy and depositional environments of thePalaeocene–Eocenesuccession at Um El Huwaitat area, Eastern Desert, Egypt

Anan

Shahin

2020

Geological Journal

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The Palaeocene-Eocene succession in southwest Safaga, Eastern Desert, Egypt has been studied to determine its lithostratigraphic units, biostratigraphic zonation, microfacies association, and depositional environments. The variation in lithofacies allows the subdivision of the Danian-Ypresian interval into four lithostratigraphic units that are arranged, from base to top, as the Dakhla Shale (only its upper part), Tarawan Chalk, Esna Shale, and Thebes Formation (only its lower part). Moreover, the Esna Shale is further subdivided into four members, arranged from base to top, as El Hanadi, Dababiya Quarry, El Mahmiya, and Abu Had. The depositional setting is interpreted to primarily reflect the relative sea-level changes. The planktonic/benthic (P/B) foraminiferal ratio is indicative of oscillations of depositional settings in normal open marine conditions, ranging from shallow inner to outer neritic environments. Biostratigraphically, the Palaeocene-Eocene succession in the studied area is subdivided into 12 biozones and subbiozones. These are correlated with the standard biozonation of the Palaeocene-Eocene. Deposition of the Palaeocene-Eocene succession in the studied area took place on a relatively stable shelf. Three lithofacies were recognized: shale, marl, and limestone. The shale lithofacies is differentiated into two sub-lithofacies; pure shale and calcareous foraminiferal shale, whereas marl lithofacies contains abundant planktonic foraminifera. The encountered carbonate rocks comprise eight microfacies types. In addition, the studied interval is correlated with the Global Standard Stratotype Section and Point in the Dababiya section, south of Luxor, Egypt.

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Chemostratigraphy of the Upper Cretaceous-Paleogene organic-rich succession on the southern Tethys margin in Egypt

Cited by 6 publications

References 35 publications

Organic Petrographic and Geochemical Evaluation of the Black Shale of the Duwi Formation, El Sebaiya, Nile Valley, Egypt

Organic Petrographic and Geochemical Evaluation of the Black Shale of the Duwi Formation, El Sebaiya, Nile Valley, Egypt

Chemostratigraphic Analysis of Wufeng and Longmaxi Formation in Changning, Sichuan, China: Achieved by Principal Component and Constrained Clustering Analysis

Biostratigraphy and depositional environments of thePalaeocene–Eocenesuccession at Um El Huwaitat area, Eastern Desert, Egypt

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