Sequence stratigraphy of the Burdigalian Rudeis Formation in Ras El-Ush oil field, Gulf of Suez: Application of gamma-ray analysis and biostratigraphy

Ayyad, Haitham M.; Fathy, Mohamed; Hewaidy, Abdel Galil A.; Abd-Allah, Adel R. A.

doi:10.1016/j.marpetgeo.2020.104694

Cited by 11 publications

(7 citation statements)

References 36 publications

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“…Cluster B mainly occurs in the lower and middle parts of the Sadat Formation, and the middle and upper parts of the Hommath Formation (Figure 7). This cluster contains many remarkable palaeoecological indicators that are widely developed within inner‐shelf water depths, including Discorbis , Quinqueloculina , Borelis , Reticulofenestra , Coccolithus pelagicus , and Cyclicargolithus floridanus (Ayyad et al, 2020; Murray, 2006; Parker, 1948; Perch‐Nielsen, 1985; Poag, 1981; Wei & Wise, 1990). This result implies that cluster B evidences the presence of an inner‐shelf environment at these intervals.…”

Section: Resultsmentioning

confidence: 99%

“…The cluster analysis is based on the percentage frequency of nannoplankton and foraminifera and has been approved as a robust tool for ecological analyses of these assemblages and their distribution in different samples (Ayyad, 2018; Ayyad et al, 2018; Couapel, Beaufort, Jones, & Chivas, 2007; Gevirtz, Park, & Friedman, 1971; Hewaidy et al, 2019). In addition, this analysis contributes to the exploration of the relations within taxa and the samples collected from the studied succession and to the visualization of differences between the defined assemblages, following Clarke and Warwick (1994), Grunert et al (2012) and Ayyad, Fathy, Hewaidy, and Abdallah (2020). Palaeobathymetric preferences for the identified nannoplankton and foraminifera were obtained by applying the PAST (PAleontological STatistics) Software Package of Hammer, Harper, and Ryan (2001).…”

Section: Methodsmentioning

confidence: 99%

“…Palaeobathymetric preferences for the identified nannoplankton and foraminifera were obtained by applying the PAST (PAleontological STatistics) Software Package of Hammer, Harper, and Ryan (2001). The following quantitative parameters were calculated precisely: Relative abundances of nannoplankton or benthic foraminiferal genera. Planktic/benthic (P/B) ratios. Shannon's H index. Fisher's alpha (α) index to assess species diversity. The high values of Fisher's α index (α) indicate a high diversity of species and an increase in the palaeodepths (Ayyad et al, 2020; Fisher, Corbet, & Williams, 1943). Otherwise, the species diversity presumably reduces towards the continental slope and rises back on abyssal plains (Douglas & Woodruff, 1981).…”

Section: Methodsmentioning

confidence: 99%

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Sequence stratigraphy of the Miocene siliciclastic–carbonate sediments in Sadat Area, north‐west of Gulf of Suez: Implications for Miocene eustasy

2022

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The Miocene sequences in the north‐west of the Gulf of Suez represent transition zones between carbonate‐dominated and siliciclastic‐dominated strata. These rocks were greatly influenced by the Gulf of Suez rifting, which resulted in lateral variations of facies and hence presented a complicated stratigraphic setting. Here, we interpret the sequence stratigraphy of the Sadat Area to the north‐west of the Gulf of Suez by integrating biostratigraphic data and microfacies analysis to contribute primarily to the geology of the studied successions and incorporate the existing knowledge of syn‐rift deposition. We determined the ages of the studied formations by biostratigraphic examination of the integrated calcareous nannoplankton, planktic, and benthic foraminifera. Our results distinguish four genetic Miocene sequences. These sequences are defined by four major sequence boundaries that outline sedimentation cycles and were chiefly deposited in a lagoon to outer‐shelf settings. The proposed Miocene eustacy is well‐correlated with global curves, implying a rise in sea level in the lower parts of Zones M4, M5, and M8. In contrast, the reduction of sea‐level rise resulted in the decrease of accommodation space in the upper part of Zone M5. The studied Miocene deposits mainly formed in a shallower marine environment, as shown by a comparison between data from the eastern side of the Gulf of Suez and the data presented in this paper. Furthermore, we demonstrate that the local tectonic activity linked with the Gulf of Suez rifting and the eustatic sea‐level changes were significant factors in the deposition of the Miocene in the studied successions.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Sequence stratigraphy of the Miocene siliciclastic–carbonate sediments in Sadat Area, north‐west of Gulf of Suez: Implications for Miocene eustasy

2022

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“…The paleobathymetric analysis was done using depth signi cant benthic foraminifera (Boersma, 1978;Braiser, 1980), , Leckie and Olson (2003), Murray (2006) and Ayyad et al, (2020). The paleosalinity analysis was based on the ratio of Textulariina, Miliolina, and Rotaliina plotted on a foraminifera shell-type ratio (morphogroup) triangular cross-plot, and the foraminifera abundance/diversity enabled the discrimination of a range of paleosalinity of deposition (Murray, 1971Murray and Wright, 1974).…”

Section: Methodsmentioning

confidence: 99%

High-resolution Biostratigraphy, Depositional History and Palaeoenvironment Based on Foraminifera and Calcareous Nannoplankton, Northwest Niger Delta

Joshua

Obiosio

Ibrahim

et al. 2022

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An integrated Micropalaeontological analysis approach was employed based on ditch cuttings samples northwest of the Niger Delta. Lithofacies description showed the entire sediment successions consisted of alternating shale and sand lithology. A moderate to the rich recovery of about seventy-one foraminifera and forty calcareous nannofossil species were recovered, having the presence of Miocene foraminifera (Orbulina universa, Globigerinoides bulloideus, Globorotalia obesa, Globorotalia mayeri and Globorotalia continuosa) and nannofossil (Sphenolithus moriformis, Catinaster coalithus, Discoaster berggrenii and Discoaster kugleri). Three foraminifera planktonic zones were proposed for this study and were correlated to other worldwide zones; Globerigenoides bulloideus, Globeriginoides obliquus obliquus and Globerigenoides primordius spanning the Neogene (N) 6 to N17 zone. Two calcareous nannoplankton zones were proposed, which are; Helicosphaera intermedia and Sphenolithus moriformis spanning the Neogene Nannofossil (NN) 3 to NN11 zone. Three third-order sea-level rises and falls occurred during the Early to Late Miocene within the Niger Delta, with a corresponding paleo-waterdepth from transitional to outer neritic. The Chiloguembelina-3 Shale (16.0 Ma), Dodo Shale (11.6 Ma) and the Uvigerina-8 Shale (9.2 Ma), were associated with transgression. The 15.5 Ma SB of Depositional Sequence 1(Early Miocene), 10.5 Ma SB of Depositional Sequence 2(Middle Miocene) and 8.5 Ma SB of Depositional Sequence 3(Late Miocene) due to progradation. The paleosalintiy based on shell type morphology assemblages suggests a transition from the brackish marginal marine environment to open neritic conditions. The study interval is said to have penetrated sediments of the parallic Early to Late Miocene Agbada formation.

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“…Sequence stratigraphy may introduce a more accurate and detailed correlation for the Miocene succession of west–central Sinai to enhance the knowledge of the lateral facies variability. Some papers have treated the sequence stratigraphy of the Egyptian upper Oligocene–middle Miocene succession (e.g., Ayyad et al, 2020; El‐Azabi, 2004; Hewaidy et al, 2013; Wescot et al, 1996). Relative sea‐level oscillations are the main driver for environmental fluctuations and, therefore, lead to significant changes in the faunal distribution.…”

Section: Introductionmentioning

confidence: 99%

Sequence stratigraphy of the upper Oligocene–middle Miocene succession in west–central Sinai, Egypt

et al. 2022

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The calcareous nannofossil and foraminiferal analyses have been integrated to build a detailed chronostratigraphic scheme for the upper Oligocene-middle Miocene succession in the Nukhul-Sudr area, west-central Sinai, Egypt. The palaeoenvironmental conditions of the studied succession were assessed using the palaeoecologic preferences of calcareous nannofossil species, benthic foraminifera, and planktonic/benthic (P/B) ratios. Six complete and two incomplete depositional sequences bounded by seven sequence boundaries have been distinguished in the studied sections based on the integration between chronostratigraphic and palaeoenvironmental interpretations as well as the nature of stratigraphic surfaces. Levels suggesting subaerial exposures (such as alluvial fans and polymictic conglomerates) and biostratigraphic breaks were employed to delineate sequence boundaries. The inferred relative sea-level curve points to palaeodepth change ranging from lagoonal to outer shelf settings during the deposition. The established upper Oligocene-middle Miocene sequence stratigraphic framework demonstrates a more-or-less compatible correlation toward the corresponding ones from the neighbouring localities around the eastern rim of the Gulf of Suez. However, the inferred relative sea-level curve shows significant deviations when compared with the eustasy. These deviations are expressed mainly by several prolonged time gaps and discrepancies in the timing and magnitude of the transgression and regression events. Therefore, the Gulf of Suez rift Basin development and the coincident regional tectonic events are the main controlling factors for the sedimentation regime in west-central Sinai.

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Sequence stratigraphy of the Burdigalian Rudeis Formation in Ras El-Ush oil field, Gulf of Suez: Application of gamma-ray analysis and biostratigraphy

Cited by 11 publications

References 36 publications

Sequence stratigraphy of the Miocene siliciclastic–carbonate sediments in Sadat Area, north‐west of Gulf of Suez: Implications for Miocene eustasy

Sequence stratigraphy of the Miocene siliciclastic–carbonate sediments in Sadat Area, north‐west of Gulf of Suez: Implications for Miocene eustasy

High-resolution Biostratigraphy, Depositional History and Palaeoenvironment Based on Foraminifera and Calcareous Nannoplankton, Northwest Niger Delta

Sequence stratigraphy of the upper Oligocene–middle Miocene succession in west–central Sinai, Egypt

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