Haitham M. Ayyad

@azhar.edu.eg

Al-Azhar University, Faculty o Science, Geology Department
Al-Azhar University

Haitham M. Ayyad


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https://researchid.co/haithamayyad

RESEARCH INTERESTS

Sequence Stratigraphy, Micropaleontology
24

Scopus Publications

296

Scholar Citations

11

Scholar h-index

12

Scholar i10-index

Scopus Publications

  • Secondary Uranium Mineral Assemblages in Carboniferous Paleokarst Infill, Um Bogma Formation, the Southern Tethyan Margin: Implications for the Arabian–Nubian Shield in Mineralogical Characterization and Supergene Enrichment
    Mohamed W. Abd El-Moghny, Mohamed H. Helal, Osama Ramzy Elshahat, Mohamed Mohamed Fahim Abaza, Mahmoud Mohamed Mohamed Ali Gabr, et al.
    Minerals, 2026
    The Lower Carboniferous Um Bogma Formation in southwestern Sinai has sixteen paleokarst structures at Allouga, Abu Thor, and Abu Zarab. Each structure contains high uranium concentrations. These occur in a lateritic infill sequence formed along the southern Tethyan margin. Radiometric reconnaissance in this sector of the Arabian–Nubian Shield has been ongoing for decades. However, the mineralogical character of assemblages in the region was never systematically documented. This study uses multiple techniques to characterize both radioactive and non-radioactive mineral assemblages from paleokarst-fill materials at all sites. Geochemical analysis was used to clarify uranium fixation and ore genesis. Nine radioactive minerals were identified: carnotite, autunite, torbernite, uranophane, uranothorite, thorite, chalcophanite, natroboltwoodite, and soddyite. Eight nonradioactive accessory phases were also found: zircon, monazite, malachite, atacamite, jarosite, rutile, arsenopyrite, and paratacamite. Geochemical data indicate that iron oxide surface adsorption is the dominant mechanism of uranium fixation. A strong positive correlation between uranium and Fe2O3 (r = 0.98), together with negative correlations with carbonate-associated elements (CaO, MgO, Na2O), supports this interpretation. Therefore, uranium is classified as a supergene, low-grade ore. It is concentrated during laterite maturation in paleokarst cavities. Its distribution is governed by ferruginous siltstone lithofacies, not the enclosing carbonate host. These findings offer a reference paragenetic framework for secondary uranium metallogenesis in Carboniferous carbonate terrains of the Arabian–Nubian Shield. They also provide a mineralogical template for exploration in similar paleokarst-hosted systems across the Arabian Platform.
  • Foraminiferal Proxies Reveal Miocene Climatic Shifts in the Gulf of Suez: Insights From the Rudeis and Kareem Formations on Lithostratigraphic Ambiguities and Central Paratethys Climatic Linkages During Burdigalian-Langhian Intervals
    Haitham M. Ayyad, Youssef S. Bazeen, Ahmed Samir, Shaaban G. Ghanem, Ali H. Ali, et al.
    Geological Journal, 2026
    This study applies non‐destructive foraminiferal proxies to refine the stratigraphic framework, clarify climatic variations during the Miocene period, and investigate potential climatic teleconnections in the Gulf of Suez, Egypt. A comprehensive biostratigraphic differentiation of the Burdigalian‐Langhian Rudeis and Kareem formations is achieved based on distinctive assemblages of planktonic foraminifera. The Rudeis Formation is characterised by Globigerina falconensis and Trilobatus sacculifer (> 50%), while the Kareem Formation is characterised by Orbulina universa and O. suturalis. The consistent absence of Praeorbulina glomerosa, O. suturalis, and O. universa from the Rudeis Formation is a major diagnostic feature for its distinction from the Kareem Formation. A clear unconformity at the contact between the Rudeis and Kareem formations is linked with hiatuses of about 1.15 and 1.57 Myr, providing justification for separating the two formations. Reconstructed sea surface temperatures (SST) from planktonic foraminifera record significant warming events throughout the Burdigalian‐Langhian period, with average SSTs in the Gulf of Suez attaining 20.5°C within the Middle Miocene Warm Interval (Mi1b) and 20.4°C, 19.7°C, and 19.6°C within the Langhian Warming (Mi2a). The Gulf of Suez SSTs exhibit 0.8°C–1.7°C warming above the Global Average Temperature, reflecting regional amplification of global trends. Correlating the first appearance of key taxa (Orbulina universa, O. suturalis) in the Kareem Formation with regional bioevents aligns the local stratigraphy with broader Mediterranean‐Paratethyan frameworks. This multi‐proxy integration strengthens the stratigraphic resolution and establishes the Gulf of Suez as a critical archive for understanding Miocene climatic dynamics in the Mediterranean‐Paratethys gateway region, offering analogs for assessing modern marine ecosystem resilience under anthropogenic climate change.
  • Integrated Fault Seal Integrity and Hydrocarbon Migration Assessment in Inverted Rift Basins: Evidence from Tethyan Margin Rift Basins and Global Analogs
    Tharwat H. Abdel Hafeez, Hatem E. Semary, Mohamed Fathy, Mostafa Hussien, Anis Ben Ghorbal, et al.
    Geological Journal, 2026
    This is an integrated, process‐based evaluation of fault seal integrity and hydrocarbon migration fairways within the Gindi Basin and Mubarak Sub‐basin of Egypt's Western Desert, and located bordering the greater Abu Gharadig Basin. These sub‐basins represent structurally characteristic examples of Tethyan Margin Rift Basins, where prolonged extensional tectonics followed by contractional reactivation has produced complex trap architectures with variable seal integrity. The sub‐basins are highly faulted and have an extensional‐inversion history, unlike the border Gindi foredeep basin, which is defined by thick syn‐inversion Campanian–Eocene sedimentation. Integration of a combination of 3D seismic interpretation, well‐log derived lithofacies mapping, fault juxtaposition analysis, burial history modelling, and geochemical data is applied in the study to appraise the structural and stratigraphic controls on trap integrity and hydrocarbon charge. The results show that fault seal quality is highly variable and is controlled primarily by lithological juxtaposition, fault reactivation, and relative inversion timing in relation to hydrocarbon expulsion. Vertical migration prevails in the Gindi basin, where reactivated Jurassic faults form conduits from mature Khatatba and Abu Roash F source rocks into overlying reservoirs. The Mubarak sub‐basin is a segmented, laterally oriented migration system, where hydrocarbons migrate along carrier beds into fault‐bounded closures such as Yomna and Karama. High‐potential exploration targets are Yomna South and Misaada East prospects, where favourable juxtaposition and source proximity contribute to trap viability. The study defines tectonic inversion's dual role in enhancing and compromising trap integrity and the advantage of combining structural, stratigraphic, and geochemical data in reducing exploration risk. Suggestions for future work include acquiring high‐resolution 3D and 4D seismic in structurally complex areas, applying QEMSCAN and innovative petrophysical tools to tight reservoir evaluation, and prioritizing drilling in areas of assessed seal integrity and mature source proximity. Comparison with global analogs from the North Sea, Zagros, and Neuquén Basin confirms the applicability of this workflow to structurally inverted basins worldwide. The insights gained extend beyond the Western Desert and are directly transferable to analogous Tethyan Margin Rift Basins and other inverted rift systems globally.
  • Morphological Controls of Submarine Canyons on Reservoir Heterogeneity: Seismic Detection of the Matruh Canyon (Cretaceous, Egypt) and Global Deep-Water Analogues
    Tharwat H. Abdel Hafeez, Hatem E. Semary, Ahmed A. Essa, Mohamed Fathy, Anis Ben Ghorbal, et al.
    Acta Geologica Sinica English Edition, 2026
    Submarine canyons critically control reservoir heterogeneity in deep‐water settings, yet their erosional surfaces often evade seismic detection. This study integrates the instantaneous phase, variance coherence, spectral whitening and acoustic impedance inversion of advanced seismic attributes to resolve the morphology of the Cretaceous Matruh Canyon (Egypt's Western Desert) and quantify its impact on the Alam El Bueib IIIG reservoir. Conventional 2D seismic data initially obscured the canyon's basal erosional surface due to velocity push‐down artefacts and sparse line spacing. Our workflow successfully delineated a U‐shaped, fault‐controlled incision system, revealing stark thickness variations (> 440 ft locally) where canyon infill replaced reservoir sands with sealing Matruh Shale. Paradoxically, while this erosion disrupted continuity evidenced by shale‐plugged wells (e.g., Emry Deep_04), it concurrently created stratigraphic traps through lateral sand‐shale juxtaposition and shale‐drape seals. Note that shale gouge ratio analysis confirmed robust lateral seals (> 80%) along bounding faults, notably where shale thickness exceeded 200 ft. We initially struggled to reconcile the abrupt transition from productive sands (Emry Deep_01X) to non‐reservoir intervals until spectral whitening resolved thin (< 138 ft) SII sand remnants. Global analogues (Brazil Pre‐salt, Niger Delta) highlight Matruh's uniqueness: its syn‐rift tectonic setting and > 400‐m incision depth create traps distinct from post‐rift carbonates or shale diapirs.
  • Stratigraphic Barriers in a Cretaceous Tide-Dominated Estuary: Integrated Multiscale Analysis of Dry Well Causes, Wadi Rayan Oil Field (Afro–Arabian Shield Margin, Egypt)
    Mohamed Fathy, Anis Ben Ghorbal, Tamer H. Yassin, Hatem E. Semary, Youssef S. Bazeen, et al.
    Geological Journal, 2026
    The Wadi Rayan oil field has experienced inconsistent production. This stems from lateral and vertical heterogeneities within the sandstone reservoirs, which profoundly impact hydrocarbon flow. A comprehensive multiscale study integrating sequence stratigraphy, seismic interpretation, and petrographic analysis was conducted to characterise the reservoir system. Our results reveal a complex, tidally‐dominated estuarine system deposited during the Cenomanian on a low‐gradient shelf. Crucially, reservoir quality is facies‐controlled, with high‐energy channel sands preserving good porosity (0.15–0.28) despite silica cementation, whereas moderate‐energy tidal bars suffer significant porosity reduction from calcite cementation. Structurally, the main field closure is a NE‐asymmetrical anticline bounded by faults. We constructed a 3D static model using detailed facies and property distributions, estimating cumulative stock tank original oil in place of 16.33 MMSTB across three reservoir intervals. The model definitively identified a critical stratigraphic barrier—composed of low‐permeability shelf shale and carbonate facies—that compartmentalises the reservoir and explains the presence of dry wells (e.g., WR‐2X and WR S‐1X) at structural highs. This finding challenges the notion that structure alone controls entrapment, demonstrating instead that stratigraphic complexity can override the structural template. We consequently propose drilling two appraisal wells to further evaluate future planning. This integrated approach conclusively links dry wells to specific stratigraphic complexities, enhancing reservoir understanding and providing a predictive framework for improving recovery in similar geological settings.
  • Integrated Petrophysics and 3D Modeling to Evaluate the Role of Diagenesis in Permeability of Clastic Reservoirs, Belayim Formation, Gulf of Suez
    Mohamed Fathy, Mahmoud M. Abdelwahab, Haitham M. Ayyad
    Minerals, 2025
    Fluid flow prediction in clastic heterogeneous reservoirs is a universal issue, especially when diagenetic development supplants structural and depositional controls. We consider this issue in the Middle Miocene Belayim Formation of the Gulf of Suez, a principal syn-rift reservoir where extreme, diagenetically induced pore system heterogeneity thwarts production. Although fault compartmentalization is understood as creating first-order traps, sub-seismic diagenetic controls on permeability anisotropy and reservoir within these traps are not restricted. This study uses a comprehensive set of petrophysical logs (ray gamma, resistivity, density, neutrons, sonic) of four key wells in the western field of Tawila (Tw-1, Tw-3, TW-4, TN-1). We apply an integrated workflow that explicitly derives permeability from petrophysical logs and populates it within a seismically defined structural framework. This study assesses diagenetic controls over reservoir permeability and fluid flow. It has the following primary objectives: (1) to characterize complicated diagenetic assemblage utilizing sophisticated petrophysical crossplots; (2) to quantify the role of shale distribution morphologies in affecting porosity effectiveness utilizing the Thomas–Stieber model; (3) to define hydraulic flow units (HFUs) based on pore throat geometry; and (4) to synthesize these observations within a predictive 3D reservoir model. This multiparadigm methodology, involving M-N crossplotting, Thomas–Stieber modeling, and saturation analysis, deconstructs Tawila West field reservoir complexity. Diagenesis that has the potential to destroy or create reservoir quality, namely the general occlusion of pore throats by dispersed, authigenic clays (e.g., illite) and anhydrite cement filling pores, is discovered to be the dominant control of fluid flow, defining seven unique hydraulic flow units (HFUs) bisecting the individual stratigraphic units. We show that reservoir units with comparable depositional porosity display order-of-magnitude permeability variation (e.g., >100 mD versus <1 mD) because of this diagenetic alteration, primarily via pore throat clogging resulting from widespread authigenic illite and pore occupation anhydrite cement, as quantitatively exemplified by our HFU characterization. A 3D model depicts a definitive NW-SE trend towards greater shale volume and degrading reservoir quality, explaining mysterious dry holes on structurally valid highs. Critically, these diagenetic superimpressions can replace the influence of structural geometry on reservoir performance. Therefore, we determine that a paradigm shift from a highly structured control model to an integrated petrophysical and mineralogical approach is needed. Sweet spot prediction relies upon predicting diagenetic facies distribution as a control over permeability anisotropy.
  • Multifactorial Controls on Carbonate–Clastic Sedimentation in Rift Basins: Integrated Foraminiferal, Sequence Stratigraphic, and Petrophysical Analysis, Gulf of Suez, Egypt
    Haitham M. Ayyad, Hatem E. Semary, Mohamed Fathy, Ahmed Hassan Ismail Hassan, Anis Ben Ghorbal, et al.
    Minerals, 2025
    The lithological dichotomy in the Hammam Faraun Member (Gulf of Suez, Egypt) reveals a stable western flank with Nullipore carbonate deposits, contrasting with the clastic-prone eastern margin influenced by tectonic activity. This study aims to decipher multifactorial controls on spatial lithological variability and reservoir implications through (1) foraminiferal-based paleoenvironmental reconstruction; (2) integrated sequence stratigraphic–petrophysical analysis for sweet spot identification; and (3) synthesis of lateral facies controls. This study uniquely integrates foraminiferal paleoenvironmental proxies, sequence stratigraphy, and petrophysical analyses to understand the multifactorial controls on spatial variability and its implications for reservoir characterization. Middle Miocene sea surface temperatures, reconstructed between 19.2 and 21.2 °C, align with warm conditions favorable for carbonate production across the basin. Foraminiferal data indicate consistent bathyal depths (611–1238 m) in the eastern region, further inhibited in photic depths by clastic influx from the nearby Nubian Shield, increasing turbidity and limiting carbonate factory growth. Conversely, the western shelf, at depths of less than 100 m, supports thriving carbonate platforms. In the sequence stratigraphy analysis, we identify two primary sequences: LA.SQ1 (15.12–14.99 Ma), characterized by evaporitic Feiran Member deposits, and LA.SQ2 (14.99–14.78 Ma), dominated by clastic deposits. The primary reservoir comprises highstand systems tract (HST) sandstones with effective porosity ranging from 17% to 22% (calculated via shale-corrected neutron density cross-plots) and hydrocarbon saturation of 33%–55% (computed using Archie’s equation). These values, validated in Wells 112-58 (ϕe = 19%, Shc = 55%) and 113M-81 (ϕe = 17%, Shc = 33%), demonstrate the primary reservoir potential. Authigenic dolomite cement and clay content reduce permeability in argillaceous intervals, while quartz dissolution in clean sands enhances porosity. This research emphasizes that bathymetry, sediment availability, and syn-sedimentary tectonics, rather than climate, govern carbonate depletion in the eastern region, providing predictive parameters for identifying reservoir sweet spots in clastic-dominated rift basins.
  • Multiproxy faunal analysis of the middle – upper Eocene deposits in the Fayum area, Egypt: Insights into sequence stratigraphy, trophic conditions, and oxygenation
    Abdel Galil A. Hewaidy, Youssef S. Bazeen, Ahmed Samir, El Sayed M. Moneer, Arafa F. El-Balkiemy, et al.
    Journal of African Earth Sciences, 2024
  • Integrating facies, mineralogy, and paleomagnetism to constrain the age and provenance of Paleozoic siliciclastic sedimentary rocks along the northern Gondwana margin: insights from the Araba and Naqus formations in western Gulf of Suez, Egypt
    Ashraf M. Al-Nashar, Nabil A. Abdel Hafez, Mohamed W. Abd El-Moghny, Ahmed Awad, Sherif Farouk, et al.
    International Journal of Earth Sciences, 2024
    The depositional ages and provenance of the Paleozoic Araba and Naqus Formations along the northern Gondwanan margin in Egypt have remained uncertain due to a lack of index fossils. Resolving this issue is crucial for understanding regional geology during deposition and subsequent tectonic development. We integrate detailed facies analysis, anisotropy of magnetic susceptibility (AMS), paleomagnetism, and mineralogical data to elucidate the genesis and depositional ages of the Araba and Naqus Formations. Petrographic analyses identified seven distinct facies types, providing insights into sedimentary textures, maturity, and sources, with contributions from igneous and metamorphic sources indicated by heavy minerals. X-ray diffraction (XRD) analysis identified accessory minerals such as quartz, goethite, kaolinite, hematite, and anatase. Paleomagnetism isolated two magnetic components (CA and CN) providing the first robust paleo pole positions at Lat. = 70.8° N, Long. = 308.2° E and Lat. = 37.8° N, Long. = 233.1° E, indicating Cambrian and Carboniferous ages for the Araba and Naqus formations, respectively. Thermal demagnetization constrained these dates using established polarity timescales. Mineralogical data indicated that the Araba Formation originated from an igneous source, while the Naqus Formation had a mixed metamorphic-igneous provenance. The integrated AMS and paleomagnetic data reveal evidence of post-depositional deformation. Specifically, the clustering of maximum AMS axes in the NW–SE direction for both formations, suggests the initial presence of a primary depositional fabric. However, prevalent tectonic activity during the Cenozoic appears to have overprinted and modified this fabric through deformation related to rifting of the Gulf of Suez region. Through this novel multi-proxy approach, we have resolved long-standing uncertainties regarding the formations' depositional ages. Our study thereby provides the first chronostratigraphic framework for these strategically important sedimentary units, significantly advancing understanding of regional Paleozoic geology. Graphical abstract
  • Taxonomy, paleoecology, and paleobiogeographical significance of the middle-late Eocene molluscs from the Garet Gehannem section in the Fayoum depression, Egypt
    El Sayed M. Moneer, Abdel Galil A. Hewaidy, Haitham M. Ayyad, Ahmed Samir, Mohammed S. Antar, et al.
    Journal of African Earth Sciences, 2024
  • Sequence stratigraphy of the Paleocene succession in the Kharga Oasis, Western Desert, Egypt: insights from microplankton biostratigraphy and benthic foraminifer paleoenvironments
    Youssef S. Bazeen, Abdel Galil A. Hewaidy, Ahmed Samir, El Sayed M. Moneer, Mohamed W. Abd El-Moghny, et al.
    Palaeoworld, 2024
  • Integrated biostratigraphy and chemostratigraphy of the Maastrichtian–Danian succession at Abu Minqar, Egyptian Western Desert: Implications for sequence stratigraphy and tectonic influence
    Youssef S. Bazeen, Walid G. Kassab, El Sayed M. Moneer, Gebely A. Abu El-Kheir, Mohamed K. AbdelGawad, et al.
    Cretaceous Research, 2024
  • Sequence stratigraphy and reservoir quality of the Gulf of Suez syn-rift deposits of the Nukhul formation: Implications of rift initiation and the impact of eustacy and tectonic on deposition
    Haitham M. Ayyad, Abdel Galil A. Hewaidy, Mustafa Omar, Mohamed Fathy
    Marine and Petroleum Geology, 2023
  • Sequence stratigraphy and reservoir characterization of the lower Eocene rocks (Thebes Formation) along the Tethyan Ocean's southern margin: biostratigraphy and petrophysical parameter applications
    Haitham M. Ayyad, Mohamed W. Abd El-Moghny, Hesham Abuseda, Ahmed Samir, Youssef S. Bazeen
    International Journal of Earth Sciences, 2023
  • Sequence stratigraphy of the upper Oligocene–middle Miocene succession in west–central Sinai, Egypt
    Haitham M. Ayyad, Abdel Galil A. Hewaidy, Sherif Farouk, Ahmed Samir, Youssef S. Bazeen
    Geological Journal, 2023
  • Sequence stratigraphy of the Miocene siliciclastic–carbonate sediments in Sadat Area, north-west of Gulf of Suez: Implications for Miocene eustasy
    Haitham M. Ayyad, Abdel Galil A. Hewaidy, Naser A. Al‐Labaidy
    Geological Journal, 2022
  • Monitoring the Deformation of the Western part of the Nile Delta, Egypt Using Sentinel-1A and Seismicity Data
    Mahmoud Etman, Abdelmonem Mohamed, Haitham Ayyad, Mustafa Abu-Bakr, and
    Iraqi Geological Journal, 2022
  • Sequence stratigraphy of the Burdigalian Rudeis Formation in Ras El-Ush oil field, Gulf of Suez: Application of gamma-ray analysis and biostratigraphy
    Haitham M. Ayyad, Mohamed Fathy, Abdel Galil A. Hewaidy, Ahmed Abdallah
    Marine and Petroleum Geology, 2020
  • Sequence stratigraphy and biozonation of the Upper Eocene Anqabiya Formation, Gebel Anqabiya, Egypt
    Abdel Galil A. Hewaidy, Haitham M. Ayyad, Mohamed W. Abd El-Moghny, Osama Gameel
    Geosciences Journal, 2019
  • Quantitative reconstruction of paleoenvironmental conditions in the Gulf of Suez during the Burdigalian-Langhian (early to middle Miocene) using benthic foraminifera
    Haitham M. Ayyad, Ahmed A. El-Sharnoby, Ahmed M. El-Morsy, Mustafa A. Ahmed, Ahmed A. El-Deeb
    Palaeogeography Palaeoclimatology Palaeoecology, 2018
  • Calcareous nannofossil biostratigraphy and paleoclimatology of the Paleocene succession, Tenida area, Western Desert, Egypt
    Haitham M. Ayyad
    Revue De Micropaleontologie, 2018
  • Integrated biostratigraphy of the upper Oligocene-middle Miocene successions in west central Sinai, Egypt
    Abdel Galil A. Hewaidy, Sherif Farouk, Haitham M. Ayyad
    Journal of African Earth Sciences, 2014
  • Foraminifera and sequence stratigraphy of Burdigalian - Serravallian successions on the eastern side of the Gulf of Suez, southwestern Sinai, Egypt
    Abdel Galil A. Hewaidy, Sherif Farouk, Haitham M. Ayyad
    Neues Jahrbuch Fur Geologie Und Palaontologie Abhandlungen, 2013
  • Nukhul formation in wadi baba, southwest sinai peninsula,Egypt
    Abdel Galil A. Hewaidy, Sherif Farouk, Haitham M. Ayyad
    Geoarabia, 2012

RECENT SCHOLAR PUBLICATIONS

  • Secondary Uranium Mineral Assemblages in Carboniferous Paleokarst Infill, Um Bogma Formation, the Southern Tethyan Margin: Implications for the Arabian–Nubian Shield in …
    MW Abd El-Moghny, MH Helal, OR Elshahat, MMF Abaza, MMMA Gabr, ...
    Minerals 16 (5), 558 , 2026
    2026
  • Foraminiferal Proxies Reveal Miocene Climatic Shifts in the Gulf of Suez: Insights From the Rudeis and Kareem Formations on Lithostratigraphic Ambiguities and Central …
    HM Ayyad, YS Bazeen, A Samir, SG Ghanem, AH Ali, AT Gaafar, ...
    Geological Journal 61 (3), 625-649 , 2026
    2026
    Citations: 3
  • Morphological Controls of Submarine Canyons on Reservoir Heterogeneity: Seismic Detection of the Matruh Canyon (Cretaceous, Egypt) and Global Deep‐Water Analogues
    TH Abdel Hafeez, HE Semary, AA Essa, M Fathy, AB Ghorbal, HM Ayyad
    Acta Geologica Sinica‐English Edition , 2026
    2026
  • Stratigraphic Barriers in a Cretaceous Tide‐Dominated Estuary: Integrated Multiscale Analysis of Dry Well Causes, Wadi Rayan Oil Field (Afro–Arabian Shield Margin, Egypt)
    M Fathy, AB Ghorbal, TH Yassin, HE Semary, YS Bazeen, HM Ayyad
    Geological Journal , 2026
    2026
  • Integrated Petrophysics and 3D Modeling to Evaluate the Role of Diagenesis in Permeability of Clastic Reservoirs, Belayim Formation, Gulf of Suez
    M Fathy, MM Abdelwahab, HM Ayyad
    Minerals 15 (10), 1092 , 2025
    2025
    Citations: 2
  • Multifactorial Controls on Carbonate–Clastic Sedimentation in Rift Basins: Integrated Foraminiferal, Sequence Stratigraphic, and Petrophysical Analysis, Gulf of Suez, Egypt
    HM Ayyad, HE Semary, M Fathy, AHI Hassan, A Ben Ghorbal, M Reda
    Minerals 15 (8), 864 , 2025
    2025
    Citations: 4
  • Multiproxy faunal analysis of the middle–upper Eocene deposits in the Fayum area, Egypt: Insights into sequence stratigraphy, trophic conditions, and oxygenation
    AGA Hewaidy, YS Bazeen, A Samir, ESM Moneer, AF El-Balkiemy, ...
    Journal of African Earth Sciences 218, 105352 , 2024
    2024
    Citations: 4
  • Integrating facies, mineralogy, and paleomagnetism to constrain the age and provenance of Paleozoic siliciclastic sedimentary rocks along the northern Gondwana margin: insights …
    AM Al-Nashar, NAA Hafez, MWA El-Moghny, A Awad, S Farouk, ...
    International Journal of Earth Sciences 113 (4), 923-950 , 2024
    2024
    Citations: 6
  • Taxonomy, paleoecology, and paleobiogeographical significance of the middle-late Eocene molluscs from the Garet Gehannem section in the Fayoum depression, Egypt
    MM El Sayed, AGA Hewaidy, HM Ayyad, A Samir, MS Antar, ...
    Journal of African Earth Sciences 214, 105231 , 2024
    2024
    Citations: 4
  • Sequence stratigraphy of the Paleocene succession in the Kharga Oasis, Western Desert, Egypt: Insights from microplankton biostratigraphy and benthic foraminifer paleoenvironments
    YS Bazeen, AGA Hewaidy, A Samir, ESM Moneer, MW Abd El-Moghny, ...
    Palaeoworld 33 (1), 188-204 , 2024
    2024
    Citations: 15
  • Integrated biostratigraphy and chemostratigraphy of the Maastrichtian–Danian succession at Abu Minqar, Egyptian Western Desert: Implications for sequence stratigraphy and …
    YS Bazeen, WG Kassab, MM El Sayed, GAA El-Kheir, MK AbdelGawad, ...
    Cretaceous Research 154, 105723 , 2024
    2024
    Citations: 9
  • Sequence stratigraphy and reservoir quality of the Gulf of Suez syn-rift deposits of the Nukhul formation: Implications of rift initiation and the impact of eustacy and …
    HM Ayyad, AGA Hewaidy, M Omar, M Fathy
    Marine and Petroleum Geology 156, 106459 , 2023
    2023
    Citations: 12
  • Sequence stratigraphy and reservoir characterization of the lower Eocene rocks (Thebes Formation) along the Tethyan Ocean's southern margin: biostratigraphy and petrophysical …
    HM Ayyad, MWA El-Moghny, H Abuseda, A Samir, YS Bazeen
    International Journal of Earth Sciences 112 (3), 1091-1112 , 2023
    2023
    Citations: 12
  • Sequence stratigraphy of the upper Oligocene–middle Miocene succession in west–central Sinai, Egypt
    HM Ayyad, AGA Hewaidy, S Farouk, A Samir, YS Bazeen
    Geological Journal 58 (1), 264-282 , 2023
    2023
    Citations: 14
  • Monitoring the deformation of the western part of the Nile Delta, Egypt using sentinel-1A and seismicity data
    MS Etman, AS Mohamed, HM Ayyad, MM Abu-Bakr
    The Iraqi Geological Journal, 27-38 , 2022
    2022
    Citations: 2
  • Sequence stratigraphy of the Miocene siliciclastic–carbonate sediments in Sadat Area, north‐west of Gulf of Suez: Implications for Miocene eustasy
    HM Ayyad, AGA Hewaidy, NA Al‐Labaidy
    Geological Journal, https://doi.org/10.1002/gj.4406 , 2022
    2022
    Citations: 10
  • Sequence stratigraphy of the Burdigalian Rudeis Formation in Ras El-Ush oil field, Gulf of Suez: Application of gamma-ray analysis and biostratigraphy
    HM Ayyad, M Fathy, AGA Hewaidy, A Abdallah
    Marine and Petroleum Geology 122, 104694 , 2020
    2020
    Citations: 22
  • Biostratigraphy of the Miocene successions in the Sadat Area, west Gulf of Suez-Egypt
    AGA Hewaidy, HM Ayyad, N Ahmed
    Egyptian Journal of Geology, 64, 455-470 , 2020
    2020
    Citations: 8
  • Sequence stratigraphy and biozonation of the Upper Eocene Anqabiya Formation, Gebel Anqabiya, Egypt
    AGA Hewaidy, HM Ayyad, MW Abd El-Moghny, O Gameel
    Geosciences Journal 23 (3), 357-375 , 2019
    2019
    Citations: 9
  • Quantitative reconstruction of paleoenvironmental conditions in the Gulf of Suez during the Burdigalian-Langhian (early to middle Miocene) using benthic foraminifera
    HM Ayyad, AA El-Sharnoby, AM El-Morsy, MA Ahmed, AA El-Deeb
    Palaeogeography, Palaeoclimatology, Palaeoecology 503, 51-68 , 2018
    2018
    Citations: 16

MOST CITED SCHOLAR PUBLICATIONS

  • Nukhul formation in wadi baba, southwest sinai peninsula, Egypt
    AGA Hewaidy, S Farouk, HM Ayyad
    GeoArabia 17 (1), 103-120 , 2012
    2012
    Citations: 36
  • FORAMINIFERA AND SEQUENCE STRATIGRAPHY OF MIOCENE SUCCESSION IN THE EASTERN SIDE OF THE GULF OF SUEZ...
    AGAH Hewaidy
    2013
    Citations: 33
  • Integrated biostratigraphy of the upper Oligocene–middle Miocene successions in west central Sinai, Egypt
    AGA Hewaidy, S Farouk, HM Ayyad
    Journal of African Earth Sciences 100, 379-400 , 2014
    2014
    Citations: 28
  • Sequence stratigraphy of the Burdigalian Rudeis Formation in Ras El-Ush oil field, Gulf of Suez: Application of gamma-ray analysis and biostratigraphy
    HM Ayyad, M Fathy, AGA Hewaidy, A Abdallah
    Marine and Petroleum Geology 122, 104694 , 2020
    2020
    Citations: 22
  • Quantitative reconstruction of paleoenvironmental conditions in the Gulf of Suez during the Burdigalian-Langhian (early to middle Miocene) using benthic foraminifera
    HM Ayyad, AA El-Sharnoby, AM El-Morsy, MA Ahmed, AA El-Deeb
    Palaeogeography, Palaeoclimatology, Palaeoecology 503, 51-68 , 2018
    2018
    Citations: 16
  • Sequence stratigraphy of the Paleocene succession in the Kharga Oasis, Western Desert, Egypt: Insights from microplankton biostratigraphy and benthic foraminifer paleoenvironments
    YS Bazeen, AGA Hewaidy, A Samir, ESM Moneer, MW Abd El-Moghny, ...
    Palaeoworld 33 (1), 188-204 , 2024
    2024
    Citations: 15
  • Sequence stratigraphy of the upper Oligocene–middle Miocene succession in west–central Sinai, Egypt
    HM Ayyad, AGA Hewaidy, S Farouk, A Samir, YS Bazeen
    Geological Journal 58 (1), 264-282 , 2023
    2023
    Citations: 14
  • Chattian-Aquitanian calcareous nannofossil biostratigraphy of the Nukhul Formation in Wadi Baba Section, West Central Sinai, Egypt
    HM Ayyad, AGA Hewaidy, A Hewaidy
    Stratigraphy 13 (1), 67-81 , 2016
    2016
    Citations: 13
  • Sequence stratigraphy and reservoir quality of the Gulf of Suez syn-rift deposits of the Nukhul formation: Implications of rift initiation and the impact of eustacy and …
    HM Ayyad, AGA Hewaidy, M Omar, M Fathy
    Marine and Petroleum Geology 156, 106459 , 2023
    2023
    Citations: 12
  • Sequence stratigraphy and reservoir characterization of the lower Eocene rocks (Thebes Formation) along the Tethyan Ocean's southern margin: biostratigraphy and petrophysical …
    HM Ayyad, MWA El-Moghny, H Abuseda, A Samir, YS Bazeen
    International Journal of Earth Sciences 112 (3), 1091-1112 , 2023
    2023
    Citations: 12
  • Biostratigraphy, microfacies analysis and sequence stratigraphy of the Miocene succesions in Cairo-Suez District, Egypt
    O Hewaidy, Abdel Galil A., Abd El-Moghny, Mohamed W., Ayyad, Haitham M., Gameel
    Al Azhar Bulletin of Science 29 (No. 1 (June), 2018), 39-59 , 2018
    2018
    Citations: 11
  • Sequence stratigraphy of the Miocene siliciclastic–carbonate sediments in Sadat Area, north‐west of Gulf of Suez: Implications for Miocene eustasy
    HM Ayyad, AGA Hewaidy, NA Al‐Labaidy
    Geological Journal, https://doi.org/10.1002/gj.4406 , 2022
    2022
    Citations: 10
  • Integrated biostratigraphy and chemostratigraphy of the Maastrichtian–Danian succession at Abu Minqar, Egyptian Western Desert: Implications for sequence stratigraphy and …
    YS Bazeen, WG Kassab, MM El Sayed, GAA El-Kheir, MK AbdelGawad, ...
    Cretaceous Research 154, 105723 , 2024
    2024
    Citations: 9
  • Sequence stratigraphy and biozonation of the Upper Eocene Anqabiya Formation, Gebel Anqabiya, Egypt
    AGA Hewaidy, HM Ayyad, MW Abd El-Moghny, O Gameel
    Geosciences Journal 23 (3), 357-375 , 2019
    2019
    Citations: 9
  • Biostratigraphy of the Miocene successions in the Sadat Area, west Gulf of Suez-Egypt
    AGA Hewaidy, HM Ayyad, N Ahmed
    Egyptian Journal of Geology, 64, 455-470 , 2020
    2020
    Citations: 8
  • Subsurface lower–middle Miocene biostratigraphy of Ras El Ush oil field, G. Zeit Area, Gulf of Suez, Egypt
    HMAAA Abdel Galil A. Hewaidy
    Al Azhar Bulletin of Science 29 (No. 2 (December), 2018,), 1-18 , 2018
    2018
    Citations: 8
  • Calcareous nannofossil biostratigraphy and paleoclimatology of the Paleocene succession, Tenida area, Western Desert, Egypt
    HM Ayyad
    Revue de micropaléontologie 61 (1), 37-54 , 2018
    2018
    Citations: 8
  • Integrating facies, mineralogy, and paleomagnetism to constrain the age and provenance of Paleozoic siliciclastic sedimentary rocks along the northern Gondwana margin: insights …
    AM Al-Nashar, NAA Hafez, MWA El-Moghny, A Awad, S Farouk, ...
    International Journal of Earth Sciences 113 (4), 923-950 , 2024
    2024
    Citations: 6
  • PALEOCLIMATIC ANALYSIS OF THE LATE OLIGOCENE/MIDDLE MIOCENE PLANKTONIC FAUNA OF WEST CENTRAL SIANI, EGYPT
    AGA HEWAIDY, S FAROUK, HM AYYAD
    Egypt. Jour. Paleontol 13, 29-48 , 2013
    2013
    Citations: 5
  • Multifactorial Controls on Carbonate–Clastic Sedimentation in Rift Basins: Integrated Foraminiferal, Sequence Stratigraphic, and Petrophysical Analysis, Gulf of Suez, Egypt
    HM Ayyad, HE Semary, M Fathy, AHI Hassan, A Ben Ghorbal, M Reda
    Minerals 15 (8), 864 , 2025
    2025
    Citations: 4