The effect of early Priabonian sea-level change on the depositional architecture of the lower Qasr El-Sagha Formation, Kom Aushim, NE Fayum, Egypt

Ghandour, Ibrahim M.

doi:10.1007/s00531-020-01922-9

Int J Earth Sci (Geol Rundsch)

2020

DOI: 10.1007/s00531-020-01922-9

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The effect of early Priabonian sea-level change on the depositional architecture of the lower Qasr El-Sagha Formation, Kom Aushim, NE Fayum, Egypt

Ibrahim M. Ghandour

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2023

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Sequence stratigraphy and reservoir characterization of the lower Eocene rocks (Thebes Formation) along the Tethyan Ocean's southern margin: biostratigraphy and petrophysical parameter applications

Ayyad

El-Moghny

Abuseda

et al. 2023

Int J Earth Sci (Geol Rundsch)

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The Egyptian lower Eocene carbonate rocks (Thebes Formation) are part of an extensive carbonate platform formed during an eustatic regression along the Tethyan Ocean's southern margin. These rocks are essential in developing Egypt's petroleum system because they can operate as vertical seals in specific basins or as source-reservoir rocks. However, few in-depth studies have been conducted to explore the diagenetic history, pore system, petrophysical characteristics, and sequence stratigraphic framework of these rocks and its relationship to the global sequences. Multiple datasets (foraminiferal assemblages, petrographic, and petrophysical data) from the lower Eocene strata exposed in Wadi El-Dakhl and El-Sheikh Fadl sections on the western side of the Gulf of Suez were integrated. The biostratigraphic examination of the planktic foraminifera shows that three Eocene biozones (E5–E7) were identified in the studied successions. The reservoir quality index and the flow zone indicator show that reservoir quality ranges from poor to fair and good. The primary reservoir porosity was resulted from diagenetic processes, including dissolution, fracturing, and meteoric diagenesis, which enhanced reservoir quality. The inferred benthic foraminifera and petrographic studies indicate a shallowing upward trend and deposition in fluctuating settings ranging from upper slope to middle shelf. This progressive reduction in the relative sea level corresponds to a gradual eustatic decline and demonstrates the enhanced control of tectonic activity and eustasy. Consequently, the Thebes Formation was deposited due to Tethyan sea-level changes, and its pore system was influenced by tectonics associated with the Syrian Arc system and Gulf of Suez rifting.

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Sequence stratigraphy and reservoir characterization of the lower Eocene rocks (Thebes Formation) along the Tethyan Ocean's southern margin: biostratigraphy and petrophysical parameter applications

Ayyad

El-Moghny

Abuseda

et al. 2023

Int J Earth Sci (Geol Rundsch)

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show abstract

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The effect of early Priabonian sea-level change on the depositional architecture of the lower Qasr El-Sagha Formation, Kom Aushim, NE Fayum, Egypt

Cited by 1 publication

References 52 publications

Sequence stratigraphy and reservoir characterization of the lower Eocene rocks (Thebes Formation) along the Tethyan Ocean's southern margin: biostratigraphy and petrophysical parameter applications

Sequence stratigraphy and reservoir characterization of the lower Eocene rocks (Thebes Formation) along the Tethyan Ocean's southern margin: biostratigraphy and petrophysical parameter applications

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