Geophysical assessment for the oil potentiality of the Abu Roash “G” reservoir in West Beni Suef Basin, Western Desert, Egypt

Shehata, Amer A.; Sarhan, Mohammad Abdelfattah; Abdel‐Fattah, Mohamed I.; Mansour, Sherif

doi:10.1016/j.jafrearsci.2023.104845

Cited by 25 publications

(5 citation statements)

References 39 publications

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“…Secondly, sample variations in the core analysis may not fully represent the reservoir's heterogeneity. The limited number of core samples and the localized nature of the sampling can result in uncertainties regarding the broader lithological diversity and distribution within the reservoir [46]. Different intervals in the reservoir might exhibit distinct characteristics that are not fully captured by the analyzed core samples.…”

Section: Discussionmentioning

confidence: 99%

Rock Typing and Characterization of the Late Cretaceous Abu Roash "G" Reservoirs at East Alam El-Shawish Field, Western Desert, Egypt

Sabry,

Abdel-Fattah,

El-Shafie

2023

Int. J. Petrol. Technol.

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Rock typing and petrophysical characterization play a vital role in constructing reservoir models for petroleum exploration and development. This study focuses on evaluating the petrophysical characteristics of the Late Cretaceous Abu Roash "G" Reservoirs at the East Alam El Shawish field in Egypt's Western Desert. The study involved five vertical wells and employed various techniques and analyses to investigate the reservoir. Lithology determination utilizing well logs and core analysis helps identify the lithology types and corresponding porosity of the Abu Roash "G" reservoirs. Sandstone and limestone lithologies with varying porosity ranges were identified, along with the influence of shale on neutron porosity values. Facies analysis of the Abu Roash "G" Member identified seven lithofacies types, categorized into shallow marine and deeper marine depositional environments. The petrophysical analysis involves evaluating gamma-ray logs, porosity, permeability, flow zone indicator (FZI), and reservoir quality index (RQI) values for each lithofacies type. This analysis classifies the core samples into seven reservoir rock types (RRT1 to RRT7) based on petrophysical attributes, providing a clear classification of the Abu Roash "G" reservoir interval. RRT1, RRT2, and RRT3 exhibit the highest reservoir quality, while RRT4 and RRT5 indicate moderate reservoir quality. RRT6 and RRT7 exhibit low reservoir quality due to unfavorable petrophysical behavior. The findings of this study provide valuable insights into the Abu Roash "G" reservoir, including its lithofacies, reservoir properties, and depositional environments. This knowledge is crucial for reservoir characterization and optimizing oil production strategies in the region.

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Section: Discussionmentioning

confidence: 99%

Rock Typing and Characterization of the Late Cretaceous Abu Roash "G" Reservoirs at East Alam El-Shawish Field, Western Desert, Egypt

Sabry,

Abdel-Fattah,

El-Shafie

2023

Int. J. Petrol. Technol.

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“…B2) The Malha Formation (Lower Cretaceous age, ~149 m thick) comprises a lower Member of shale, clay, sandstone with conglomerate, and an upper Member of tabular and cross-bedded sandstone (Sultan, 1985;Abu-Zied, 2007;Kassem et al, 2020). B3) The Raha to Sudr Formations (Upper Cretaceous age) represent a shallow marginal marine environment characterized by a mix of clastic and carbonate sequences (Osman, 1954;El Sharawy and Nabawy, 2016;Shehata et al, 2020;Shehata et al, 2023). C) The Cenozoic sequence spans the Palaeocene to Quaternary (Figure 3) and consists of C1) The Esna Formation (Palaeocene age, ~35 m thick).…”

Section: Sedimentological Sequencementioning

confidence: 99%

Tectonic evolution of the Gabal Loman area, North Eastern Desert, Egypt: implications from low-temperature multithermochronometry on the Arabian-Nubian shield

et al. 2023

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The Neoproterozoic Arabian-Nubian Shield (ANS) in the Eastern Desert of Egypt encloses the regional thermal-tectonic history from its development till the Oligo-Miocene when the Red Sea rift system was initiated. The application of multi-thermochronometry techniques has proven to be a successful approach to revealing the influence and extent of each regional tectonic event and the recreation of the tectono-thermal development of the studied region through time. Therefore, characteristic samples from the ANS different rock suits of the Gabal Loman area at the western flank of the northern Red Sea were collected. The Zircon fission-track data reveals the Carboniferous cooling ages, while the apatite fission-track cooling ages present two differential time spans of Cretaceous and Eocene-Oligocene. The time-temperature history modeling is integrated with fission-track data to reveal three differentiated cooling events developed in response to regional tectonic events: 1) the Hercynian (Variscan) tectonic event that influenced the ANS vicinity with rock uplifts of ca. 4 km through the Devonian-Carboniferous time, 2) the Gondwana disintegration event which influenced the region with differential rock exhumations, and 3) the northern Red Sea rifting through the Oligo-Miocene which caused a regional ca. 1 km of rift flanks exhumation. This modest rift flank uplift suggests a passive rift of the northern Red Sea rifting in the region of study.

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“…Additionally, numerous formations act as source rocks based on subsurface geologic settings and F I G U R E 1 (a) 2D map illustrating the main E-W sedimentary basin and major tectonics in the North Western Desert, Egypt (modified after Bayoumi, 1996), (b) location map of the study area, illustrating the Karam and Assil oil concessions and the selected studied wells (GPAA-4 and ASSIL-1X wells), Abu Gharadig Basin, northern Western Desert, Egypt. geochemical analysis parameters, including the Oligocene Dabaa Formation, Lower Eocene Apollonia Formation, Late Cretaceous ARD and ARF members, Late Cretaceous Upper Bahariya Formation, Early Cretaceous Kharita and Dahab shale formations (Abdel-Fattah et al, 2018;Gawad et al, 2019;Mamdouh et al, 2023;Reda et al, 2022;Sarhan et al, 2017;Shehata et al, 2023). Notably, the Jurassic Khatatba shales are believed to be the primary source of hydrocarbons, predominantly free gas with minor associated condensates (Abdel-Fattah, 2015;Gawad et al, 2021a;Gawad et al, 2021b;Reda et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…The basin exhibits diverse reservoir rocks, including the Early Cretaceous Alam El‐Bueib, Alamein and Kharita formations. Additionally, numerous formations act as source rocks based on subsurface geologic settings and geochemical analysis parameters, including the Oligocene Dabaa Formation, Lower Eocene Apollonia Formation, Late Cretaceous ARD and ARF members, Late Cretaceous Upper Bahariya Formation, Early Cretaceous Kharita and Dahab shale formations (Abdel‐Fattah et al, 2018; Gawad et al, 2019; Mamdouh et al, 2023; Reda et al, 2022; Sarhan et al, 2017; Shehata et al, 2023). Notably, the Jurassic Khatatba shales are believed to be the primary source of hydrocarbons, predominantly free gas with minor associated condensates (Abdel‐Fattah, 2015; Gawad et al, 2021a; Gawad et al, 2021b; Reda et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Integrated analysis of source rock evaluation and basin modelling in the Abu Gharadig Basin, Western Desert, Egypt: Insights from pyrolysis data, burial history, and trap characteristics

Reda,

Abdel‐Fattah,

Fathy

et al. 2024

Geological Journal

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Source rock evaluation and basin modelling play crucial roles in understanding hydrocarbon potential. In this study, pyrolysis data from 92 shale ditch samples were employed to assess the source rocks in the Abu Gharadig Basin (Western Desert, Egypt). The organic richness ranged from 0.53% to 4.1% by weight, indicating varying hydrocarbon‐generating capabilities. Specifically, kerogen types II and III exhibited the potential to generate hydrocarbons, ranging from fair to good oil sources. The burial history analysis provided insights into the sedimentation and subsidence rates during different geological periods. The Late Jurassic‐Early Cretaceous period witnessed modest rates of sedimentation and subsidence. In contrast, the Oligocene and Late Miocene periods experienced medium burial rates, while the Late Cretaceous‐Early Tertiary period exhibited high burial rates. Specific formations were examined in detail, with the Apollonia Formation standing out as a significant hydrocarbon reservoir. It entered the early oil window at approximately 17.87 Ma and the wet gas window at about 17.41 Ma in the ASSIL‐1X well. However, it didn't reach the GPAA‐4 well. The Abu Roash ‘D’ member also showed promise, entering the early oil window at 38.20 and 47.38 Ma, and the wet gas window at 37.40 and 43.64 Ma. Similarly, the Abu Roash ‘F’ member exhibited favourable hydrocarbon generation, entering the early oil window at 39.90 and 54.86 Ma, and the wet gas window at 39.70 and 51.62 Ma in both the ASSIL‐1X and GPAA‐4 wells. Based on the analysis, the Apollonia, Abu Roash ‘D’ and ‘F’ members were identified as source rocks, while the Kharita, ‘C’, ‘E’ and ‘G’ members were recognized as reservoir rocks. The Abu Roash Shale acted as an effective seal rock. The geological structure of the region revealed the presence of NW‐SE normal faults, forming a three‐way dip closure trap. This research substantially enhances our comprehension of the hydrocarbon system within this basin. It achieves this by thoroughly investigating source rock evaluation, basin modelling and delivering invaluable insights into the mechanisms that govern hydrocarbon generation, expulsion and trap age.

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Geophysical assessment for the oil potentiality of the Abu Roash “G” reservoir in West Beni Suef Basin, Western Desert, Egypt

Cited by 25 publications

References 39 publications

Rock Typing and Characterization of the Late Cretaceous Abu Roash "G" Reservoirs at East Alam El-Shawish Field, Western Desert, Egypt

Rock Typing and Characterization of the Late Cretaceous Abu Roash "G" Reservoirs at East Alam El-Shawish Field, Western Desert, Egypt

Tectonic evolution of the Gabal Loman area, North Eastern Desert, Egypt: implications from low-temperature multithermochronometry on the Arabian-Nubian shield

Integrated analysis of source rock evaluation and basin modelling in the Abu Gharadig Basin, Western Desert, Egypt: Insights from pyrolysis data, burial history, and trap characteristics

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